JP6827987B2 - Liquid crystal display device - Google Patents

Description

The present disclosure relates to a liquid crystal display device, and more particularly to a liquid crystal display device using a plurality of display panels.

A liquid crystal display device using a display panel including a liquid crystal cell is used as a display such as a television or a monitor. However, the liquid crystal display device has a lower contrast ratio than the organic EL (Electro Luminescence) display device.

Therefore, conventionally, as a technique for improving the contrast ratio of a liquid crystal display device, a technique has been proposed in which two display panels are overlapped and an image is displayed on each display panel (for example, Patent Document 1). This technology displays a color image on the front side (observer side) display panel of the two display panels arranged in the front and back, and displays a black and white image on the rear side (backlight side) display panel. This is intended to improve the contrast ratio.

Japanese Unexamined Patent Publication No. 2011-076107

However, it was found that Newton rings occur when a plurality of display panels are laminated without being bonded together. As a result, the image quality of the image displayed on the liquid crystal display device deteriorates.

The present disclosure has been made in order to solve such a problem, and an object of the present disclosure is to provide a liquid crystal display device capable of suppressing deterioration of image quality due to the occurrence of Newton ring.

In order to achieve the above object, one aspect of the liquid crystal display device according to the present disclosure is a first display panel including a first liquid crystal cell and a second display including a second liquid crystal cell and facing the first display panel. A concavo-convex structure having a predetermined external haze value is provided at the interface of the air layer existing between the first display panel and the second display panel.

According to the present disclosure, it is possible to suppress deterioration of image quality even if a plurality of display panels are laminated without being bonded to each other.

It is a figure which shows the schematic structure of the liquid crystal display device which concerns on Embodiment 1. FIG. It is sectional drawing of the liquid crystal display device which concerns on Embodiment 1. FIG. It is a partial cross-sectional view which shows the structure of the optical member in the liquid crystal display device which concerns on Embodiment 1. FIG. It is a partial cross-sectional view which shows the structure of the modification 1 of the optical member in the liquid crystal display device which concerns on Embodiment 1. FIG. It is a partial cross-sectional view which shows the structure of the modification 2 of the optical member in the liquid crystal display device which concerns on Embodiment 1. FIG. It is sectional drawing of the liquid crystal display device which concerns on modification 1 of Embodiment 1. FIG. It is sectional drawing of the liquid crystal display device which concerns on modification 2 of Embodiment 1. FIG. It is sectional drawing of the liquid crystal display device which concerns on modification 3 of Embodiment 1. FIG. It is sectional drawing of the liquid crystal display device which concerns on modification 4 of Embodiment 1. FIG. It is sectional drawing of the liquid crystal display device which concerns on Embodiment 2. FIG. It is sectional drawing of the liquid crystal display device which concerns on modification 1 of Embodiment 2. It is sectional drawing of the liquid crystal display device which concerns on modification 2 of Embodiment 2. It is sectional drawing of the liquid crystal display device which concerns on modification 3 of Embodiment 2. It is sectional drawing of the liquid crystal display device which concerns on modification 4 of Embodiment 2. It is sectional drawing of the liquid crystal display device which concerns on Embodiment 3. FIG. It is sectional drawing of the liquid crystal display device which concerns on modification 1 of Embodiment 3. It is sectional drawing of the liquid crystal display device which concerns on modification 2 of Embodiment 3.

Hereinafter, embodiments of the present disclosure will be described. It should be noted that all of the embodiments described below show a preferred specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, the arrangement positions of the components, the connection form, and the like shown in the following embodiments are examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present disclosure will be described as arbitrary components.

Further, each figure is a schematic view and is not necessarily exactly shown. Therefore, the scales and the like do not always match in each figure. In each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description will be omitted or simplified.

(Embodiment 1)
First, the liquid crystal display device 1 according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of a liquid crystal display device 1 according to the first embodiment.

The liquid crystal display device 1 is an example of an image display device configured by superimposing a plurality of display panels including liquid crystal cells, and displays a still image or a moving image (video).

As shown in FIG. 1, the liquid crystal display device 1 in the present embodiment has a first display panel 100 arranged at a position closer to the observer (front side) and a position farther from the observer than the first display panel 100 (rear). The second display panel 200 arranged on the side), the backlight 300 arranged on the rear side of the second display panel 200, and the optical member 400 arranged between the first display panel 100 and the second display panel 200. And.

The first display panel 100 is a main panel and displays an image visually recognized by the user. In the present embodiment, the first display panel 100 displays a color image. The first display panel 100 is provided with a first source driver 102 and a first gate driver 103 in order to display a color image corresponding to the input video signal in the first image display area 101 (active area).

The second display panel 200 is a sub-panel arranged on the back side of the first display panel 100. In the present embodiment, the second display panel 200 displays a monochrome image (black and white image) of an image corresponding to the color image displayed on the first display panel 100 in synchronization with the color image. The second display panel 200 is provided with a second source driver 202 and a second gate driver 203 in order to display a monochrome image corresponding to the input video signal in the second image display area 201.

The first image display area 101 and the second image display area 201 have a plurality of pixels arranged in a matrix. The number of pixels in the first image display area 101 and the number of pixels in the second image display area 201 may be the same or different, but the first image display area in the first display panel 100, which is the main panel, may be the same. The number of pixels of 101 may be larger than the number of pixels of the second image display area 201 in the second display panel 200 which is a sub panel.

The drive system of the first display panel 100 and the second display panel 200 is, for example, a transverse electric field system such as an IPS (In Plane Switching) system or an FFS (Fringe Field Switching) system, but the present invention is not limited to this. It may be a VA (Vertical Element) method, a TN (Twisted Nematic) method, or the like.

The backlight 300 irradiates light toward the first display panel 100 and the second display panel 200. The light emitted from the backlight 300 is transmitted through the second display panel 200 and then through the first display panel 100. In the present embodiment, since the optical member 400 is arranged between the first display panel 100 and the second display panel 200, the light emitted from the backlight 300 passes through the second display panel 200 and then passes through the second display panel 200. It transmits through the optical member 400 and then through the first display panel 100.

The backlight 300 is a surface light source unit that irradiates a flat and uniform diffused light (scattered light). The backlight 300 is, for example, an LED backlight using an LED (Light Emitting Diode) as a light source, but the backlight 300 is not limited thereto. Further, in the present embodiment, the backlight 300 is a direct type, and a plurality of LEDs are arranged two-dimensionally.

The backlight 300 is not limited to the direct type, but may be an edge type. Further, the backlight 300 may have an optical sheet such as a diffusion sheet (diffusing plate) for diffusing the light from the light source and a prism sheet for controlling the light distribution of the light.

The optical member 400 imparts an optical action to the light transmitted through the optical member 400. Specifically, the optical member 400 has a light diffusing action that diffuses (scatters) the light from the backlight 300. In the present embodiment, since the optical member 400 is arranged between the first display panel 100 and the second display panel 200, the optical member 400 is the light of the backlight 300 transmitted through the second display panel 200. To spread.

The optical member 400 is attached to at least one of the surface of the first display panel 100 on the side of the second display panel 200 and the surface of the second display panel 200 on the side of the first display panel 100. The details of the optical member 400 will be described later.

The liquid crystal display device 1 further includes a first timing controller 510 that controls the first source driver 102 and the first gate driver 103 of the first display panel 100, and the second source driver 202 and the second gate of the second display panel 200. It includes a second timing controller 520 that controls the driver 203, and an image processing unit 530 that outputs image data to the first timing controller 510 and the second timing controller 520.

The image processing unit 530 receives the input video signal Data transmitted from the external system, executes image processing, outputs the first image data DAT1 to the first timing controller 510, and outputs the first image data DAT1 to the second timing controller 520. 2 Outputs image data DAT2. Further, the image processing unit 530 outputs a control signal such as a synchronization signal to the first timing controller 510 and the second timing controller 520. The first image data DAT1 is image data for color display, and the second image data DAT2 is image data for monochrome display.

As described above, in the liquid crystal display device 1 according to the present embodiment, since the two display panels of the first display panel 100 and the second display panel 200 are superimposed to display the image, black can be tightened. .. As a result, an image having a high contrast ratio can be displayed.

Further, the liquid crystal display device 1 is, for example, an HDR (High Dynamic Range) compatible television, and by using a backlight capable of performing local dimming control as the backlight 300, a color image having a higher contrast ratio and higher image quality can be used. Can be displayed.

Next, the specific structure of the liquid crystal display device 1 according to the first embodiment will be described with reference to FIG. FIG. 2 is a cross-sectional view showing the configuration of the liquid crystal display device 1 according to the first embodiment.

In the liquid crystal display device 1, the first display panel 100 and the second display panel 200 are arranged via the air layer 20. That is, the first display panel 100 and the second display panel 200 are arranged separately without being bonded by a joining member such as an adhesive sheet or an adhesive. The first display panel 100 and the second display panel 200 are held by a metal or resin holding member (frame or chassis) together with the backlight 300, for example.

As shown in FIG. 2, the liquid crystal display device 1 includes a first display panel 100 and a second display panel 200 as liquid crystal modules. The first display panel 100 and the second display panel 200 are arranged so as to face each other.

The first display panel 100 and the second display panel 200 are liquid crystal display panels including liquid crystal cells. Specifically, the first display panel 100 has a first liquid crystal cell 110 and a pair of first polarizing plates 121 and 122 sandwiching the first liquid crystal cell 110. In addition, the second display panel 200 has a second liquid crystal cell 210 and a pair of second polarizing plates 221 and 222 sandwiching the second liquid crystal cell 210.

The first liquid crystal cell 110 is a first arranged between a first TFT (Thin Film Transistor) substrate 111, a first opposed substrate 112 facing the first TFT substrate 111, and a first TFT substrate 111 and a first opposed substrate 112. It includes a liquid crystal layer 113. In the present embodiment, the first liquid crystal cell 110 is arranged so that the first facing substrate 112 is located in front of the first TFT substrate 111 (on the observer side).

The first TFT substrate 111 is a substrate in which a TFT layer (not shown) is formed on a transparent substrate such as a glass substrate. The TFT layer is formed with a TFT provided corresponding to each of the pixels arranged in a matrix, wiring for supplying a voltage to the TFT, and the like. A pixel electrode for applying a voltage to the first liquid crystal layer 113 is formed on the flattening layer of the TFT layer. In the present embodiment, since the first liquid crystal cell 110 is driven by the transverse electric field method, a common electrode facing the pixel electrode is also formed on the first TFT substrate 111.

The first opposed substrate 112 is a CF substrate in which a color filter layer is formed as a pixel forming layer on a transparent substrate such as a glass substrate. The pixel forming layer of the first facing substrate 112 has a black matrix in which a plurality of matrix-like openings are formed, and a plurality of color filters formed in each opening of the black matrix. The plurality of color filters are a color filter for red, a color filter for green, and a color filter for blue, and are formed corresponding to each pixel.

The first liquid crystal layer 113 is sealed between the first TFT substrate 111 and the first opposed substrate 112. The first liquid crystal layer 113 is sealed by, for example, forming a seal member in a frame shape along the outer peripheral end portions of the first TFT substrate 111 and the first opposed substrate 112. The liquid crystal material of the first liquid crystal layer 113 can be appropriately selected according to the driving method.

Of the pair of first polarizing plates 121 and 122 sandwiching the first liquid crystal cell 110, the first polarizing plate 121 is attached to the back surface side (second display panel 200 side) of the first liquid crystal cell 110, and is the first. The 1 polarizing plate 122 is attached to the front surface (observer side) of the first liquid crystal cell 110. Specifically, the first polarizing plate 121 is attached to the outer surface of the first TFT substrate 111 of the first liquid crystal cell 110. On the other hand, the first polarizing plate 122 is attached to the outer surface of the first opposed substrate 112 of the first liquid crystal cell 110.

The pair of first polarizing plates 121 and 122 are arranged so that their polarization axes are orthogonal to each other. That is, the first polarizing plate 121 and the first polarizing plate 122 are arranged so as to have a positional relationship of cross Nicols.

The second liquid crystal cell 210 comprises a second TFT substrate 211, a second opposed substrate 212 facing the second TFT substrate 211, and a second liquid crystal layer 213 arranged between the second TFT substrate 211 and the second opposed substrate 212. Be prepared. In the present embodiment, the second liquid crystal cell 210 is arranged so that the second opposed substrate 212 is located in front of the second TFT substrate 211. The second liquid crystal cell 210 may be arranged so that the second TFT substrate 211 is located in front of the second opposed substrate 212.

The second TFT substrate 211 has the same configuration as the first TFT substrate 111, and is a substrate in which a TFT layer (not shown) is formed on a transparent substrate such as a glass substrate. Further, the second TFT substrate 211 is also formed with a pixel electrode for applying a voltage to the second liquid crystal layer 213 and a common electrode facing the pixel electrode.

The second opposed substrate 212 is a substrate in which a pixel forming layer is formed on a transparent substrate such as a glass substrate. The pixel forming layer of the second opposed substrate 212 has a black matrix in which a plurality of matrix-like openings are formed. In the present embodiment, since the second display panel 200 displays a monochrome image, a color filter is not formed on the pixel forming layer of the second opposed substrate 212.

The second liquid crystal layer 213 is sealed between the second TFT substrate 211 and the second opposed substrate 212. The second liquid crystal layer 213 is sealed by, for example, forming a seal member in a frame shape along the outer peripheral end portions of the second TFT substrate 211 and the second opposed substrate 212. The liquid crystal material of the second liquid crystal layer 213 can be appropriately selected according to the driving method.

Of the pair of second polarizing plates 221 and 222 sandwiching the second liquid crystal cell 210, the second polarizing plate 221 is attached to the front surface side (first display panel 100 side) of the second liquid crystal cell 210, and is the first. The 2 polarizing plate 222 is attached to the back surface (backlight 300 side) of the second liquid crystal cell 210. Specifically, the second polarizing plate 221 is attached to the outer surface of the second opposed substrate 212 of the second liquid crystal cell 210. On the other hand, the second polarizing plate 222 is attached to the outer surface of the second TFT substrate 211 of the second liquid crystal cell 210.

The pair of second polarizing plates 221 and 222 are arranged so that their polarization axes are orthogonal to each other. That is, the second polarizing plate 221 and the second polarizing plate 222 are arranged so as to have a positional relationship of cross Nicols.

In the liquid crystal display device 1, a concavo-convex structure 10 having a predetermined external haze value is provided at the interface of the air layer 20 existing between the first display panel 100 and the second display panel 200. Specifically, the uneven structure 10 is provided at the interface of the air layer 20 on the first display panel 100 side. In the present embodiment, the concave-convex structure 10 is provided as a surface structure of the optical member 400.

The optical member 400 is a sheet-shaped optical sheet or a film-shaped optical film, and is attached to the surface of the first display panel 100 on the second display panel 200 side. For example, the optical member 400 is attached to the surface of the first polarizing plate 121 of the first display panel 100 via an adhesive layer.

The concave-convex structure 10 of the optical member 400 is a minute surface uneven structure (external haze structure) in which minute convex portions and minute concave portions are repeatedly arranged, and is a light diffusion that diffuses light at an interface with the air layer 20. Has an action. The size of the convex portion and the concave portion of the concave-convex structure 10 is not particularly limited as long as the concave-convex structure 10 has a light diffusing action, and is, for example, a milli-order size, a micro-order size, or a nano-order size.

FIG. 3 is a diagram showing an example of the optical member 400. As shown in FIG. 3, the optical member 400 has, for example, a configuration in which a concave-convex structure 10 is formed on the surface of a light-transmitting base material layer 410. The base material layer 410 is made of a transparent resin material such as PET (polyethylene terephthalate).

The optical member 400 having the uneven structure 10 can be formed, for example, by physically embossing the flat plate-shaped base material layer 410, performing optical embossing by UV or the like, or performing nanoimprint processing. .. Further, the optical member 400 having the uneven structure 10 can also be formed by resin molding using a mold.

In the present embodiment, a plurality of light diffusing materials 411 are dispersed in the base material layer 410. The light diffusing material 411 is, for example, light diffusing fine particles. The light diffusing material 411 may be one that diffuses light by the difference in refractive index between the light diffusing material 411 and the base material layer 410, or one that diffuses light by scattering and reflecting light by the light diffusing material 411. It may be. The light diffusing material 411 in the case of diffusing light by the difference in refractive index is, for example, light diffusing fine particles such as translucent fine particles made of a resin material or air particles (bubbles). Further, the light diffusing material 411 in the case of diffusing light by scattering reflection is, for example, a filler made of an inorganic material or white fine particles, or light diffusing fine particles such as metal fine particles.

As described above, the optical member 400 in the present embodiment has the base material layer 410 in which the light diffusing material 411 is dispersed as the light diffusing layer having a predetermined internal haze value. That is, the optical member 400 has not only a light diffusing action due to the concave-convex structure 10 (external haze structure) but also a light diffusing action due to the base material layer 410 (internal haze structure) containing the light diffusing material 411.

In the optical member 400, the external haze value due to the concave-convex structure 10 should be smaller than the internal haze value due to the base material layer 410 (light diffusion layer). Specifically, in the optical member 400, the external haze value is less than 50%, and the internal haze value is 50% or more. As an example, the external haze value is 20% to 25% and the internal haze value is 80%. For example, the external haze value due to the uneven structure 10 can be adjusted by changing the shape and size of the uneven structure 10, and the internal haze value due to the base material layer 410 (light diffusion layer) is the refractive index of the light diffusing material 411. And the refractive index of the base material layer 410 can be appropriately selected, and can be adjusted by changing the content ratio of the light diffusing material 411.

The external haze value and the internal haze value of the optical member 400 can be measured, for example, as follows.

First, the optical member 400 in a state where the concave-convex structure 10 is exposed to air is irradiated with light, and the haze value of the entire optical member 400 is measured based on the amount of light before and after passing through the optical member 400. The haze value at this time is the total haze value obtained by adding the external haze value due to the uneven structure 10 and the internal haze value due to the base material layer 410 (light diffusion layer).

Next, a substance having the same refractive index as the layer to which the concave-convex structure 10 is applied is applied to the surface of the optical member 400 on the concave-convex structure 10 side to remove the concave-convex structure 10. In this state, the optical member 400 is irradiated with light, and the haze value of the optical member 400 is measured based on the amount of light before and after passing through the optical member 400. In this case, since the light diffusing action of the concave-convex structure 10 can be lost by laminating the glass plates, the haze value at this time is the haze value due only to the light diffusing action of the base material layer 410 (light diffusing layer). That is, it becomes the internal haze value.

Then, the external haze value can be calculated from the difference between the total haze value measured first and the internal haze value measured later.

The optical member 400 having the concave-convex structure 10 is not limited to the structure shown in FIG. For example, in the optical member 400 shown in FIG. 3, the cross-sectional shapes of the convex portion and the concave portion are triangular, but as in the optical member 401 shown in FIG. 4, the cross-sectional shapes of the convex portion and the concave portion are rectangular. May be good. Further, as in the optical member 402 shown in FIG. 5, particles (beads) 420 made of a resin material such as acrylic, a metal material, or a glass material are dispersed on a flat plate-shaped base material layer 410 to form particles 420. The particles 420 may be fixed to the base material layer 410 with the binder 430 by applying the binder 430 in a state where the unevenness due to the above remains.

Next, the operation and effect of the liquid crystal display device 1 according to the present embodiment will be described together with the background to the present disclosure.

As described above, the contrast ratio can be improved by superimposing the two display panels, displaying a color image on one display panel, and displaying a black-and-white image on the other display panel. For example, when the contrast ratio of one display panel is 1000: 1 or more, a high contrast ratio of 1,000,000: 1 or more can be realized by superimposing two display panels.

When a liquid crystal display device is configured by using two display panels, it has been usual to bond the two display panels together. That is, the two display panels were fixed with an adhesive or the like.

However, when the two display panels were laminated without being bonded to each other, there were some parts where the two display panels were in contact with each other and some parts where there was a gap without contact with each other. It has been found that a phenomenon called Newton ring occurs in the range where there are minute gaps around and around. The Newton ring is a phenomenon in which when there is an interface such as an air layer where the refractive index changes significantly between two display panels, fixed-end reflection and phase shift due to changes in the optical path length due to reflection occur. , It is a phenomenon that light interference occurs. When Newton ring occurs, the image quality of the image displayed on the liquid crystal display device deteriorates.

As described above, the inventor of the present application has found that when the two display panels are laminated without being intentionally bonded, a Newton ring is generated due to the formation of an air layer on the two display panels.

Therefore, as a result of diligent studies on this subject, the inventor of the present application considers the interface of the air layer existing between the two display panels, specifically, at least one of the air layer and the two display panels. It has been found that the occurrence of Newton ring that occurs when two display panels are laminated without being bonded can be suppressed by providing an uneven structure having a predetermined external haze value at the interface between the two.

Specifically, in the liquid crystal display device 1 according to the present embodiment, a concavo-convex structure having a predetermined external haze value at the interface of the air layer 20 existing between the first display panel 100 and the second display panel 200. 10 is provided.

As a result, the first display panel 100 and the second display panel 200 are laminated without being bonded to each other, so that the air layer 20 exists between the first display panel 100 and the second display panel 200. Even in this case, the occurrence of Newton ring can be effectively suppressed. As a result, it is possible to prevent deterioration of the image quality of the image displayed on the liquid crystal display device 1.

Moreover, in the liquid crystal display device 1 of the present embodiment, the first display panel 100 and the second display panel 200 are not bonded to each other. That is, the first display panel 100 and the second display panel 200 are laminated without using an adhesive. As a result, the liquid crystal display device 1 can be manufactured at low cost.

Further, in the liquid crystal display device 1 of the present embodiment, the concave-convex structure 10 is provided as a surface structure of an optical member 400 arranged between the first display panel 100 and the second display panel 200.

As a result, the occurrence of Newton ring can be suppressed only by inserting the optical member 400 having the concave-convex structure 10 between the first display panel 100 and the second display panel 200.

In this case, the optical member 400 may be attached to at least one of the surface of the first display panel 100 on the side of the second display panel 200 and the surface of the second display panel 200 on the side of the first display panel 100.

As a result, the air layer 20 between the first display panel 100 and the second display panel 200 becomes one layer, so that the occurrence of Newton ring can be further suppressed.

Further, in the liquid crystal display device 1 according to the present embodiment, the optical member 400 has a base material layer 410 containing a light diffusing material 411 as a light diffusing layer having a predetermined internal haze value.

As a result, moire that occurs when the first display panel 100 and the second display panel 200 are overlapped with each other can be suppressed, so that deterioration of the image quality of the liquid crystal display device 1 can be further suppressed. That is, a grid-like or line-like black matrix forming pixels is formed on the first display panel 100 and the second display panel 200, but when the first display panel 100 and the second display panel 200 are laminated, the first display panel 100 and the second display panel 200 are laminated. The black matrix of the first display panel 100 and the second display panel 200 causes moire (bright and dark patterns) depending on the pixel pitch. As a result, the image quality of the image displayed on the first display panel 100 on the observer side is deteriorated. Therefore, by inserting a light diffusing layer between the first display panel 100 and the second display panel 200, the light emitted from the second display panel 200 can be diffused by the light diffusing layer. As a result, the light incident on the first display panel 100 can be spatially mixed, so that the occurrence of moire can be suppressed. Therefore, deterioration of image quality due to moire can be suppressed.

Further, in the liquid crystal display device 1 of the present embodiment, the optical member 400 having a light diffusion layer is attached to the surface of the first display panel 100 on the second display panel 200 side.

As a result, the distance between the optical member 400 and the backlight 300 can be increased as compared with the case where the optical member 400 is attached to the second display panel 200. In this case, since the distance between the optical member 400 having the light diffusion layer and the black matrix of the second display panel 200 can be secured widely, the light transmitted through the black matrix of the second display panel 200 is sufficiently spread. After that, the light incident on the optical member 400 and transmitted through the second display panel 200 is sufficiently spatially mixed in the optical member 400. Therefore, since the occurrence of moire can be further suppressed, the deterioration of the image quality can be further suppressed.

Further, in the optical member 400 of the present embodiment, the external haze value is smaller than the internal haze value. In this case, for example, the external haze value is less than 50% and the internal haze value is 50% or more.

As a result, it is possible to suppress the occurrence of newton rings while effectively suppressing the occurrence of moire. Therefore, it is possible to achieve both suppression of moire generation and suppression of Newton ring generation, so that a high-quality liquid crystal display device 1 can be realized.

(Modification 1 of Embodiment 1)
FIG. 6 is a cross-sectional view of the liquid crystal display device 1A according to the first modification of the first embodiment.

As shown in FIG. 6, the liquid crystal display device 1A in the present modification has a configuration in which the liquid crystal display device 1 shown in FIG. 2 has a concavo-convex structure 10 on the second display panel 200A side. That is, in the liquid crystal display device 1A in this modification, the concave-convex structure 10 (first uneven structure 11) on the first display panel 100 side and the concave-convex structure 10 (second concave-convex structure 12) on the second display panel 200A side are two. It has two external haze structures.

In this modification, the first uneven structure 11 is an uneven structure 10 provided as a surface structure of the optical member 400, similarly to the liquid crystal display device 1 in the first embodiment.

On the other hand, the second uneven structure 12 is an uneven structure 10 provided as a surface structure of the surface of the second display panel 200A on the first display panel 100 side. As an example, the second display panel 200A is, for example, a liquid crystal display panel with an AG function having a surface structure subjected to AG (Anti-Glare) treatment as the second uneven structure 12.

Specifically, the second uneven structure 12 can be provided as the surface structure of the second polarizing plate 221A on the first display panel 100 side of the pair of second polarizing plates 221A and 222. As an example, as the second polarizing plate 221A having the second uneven structure 12, a polarizing plate with an AG function that has been subjected to AG treatment can be used.

As described above, the liquid crystal display device 1A in the present modification has an external haze structure on the second display panel 200A side in addition to the internal haze structure and the external haze structure on the optical member 400 on the first display panel 100 side. .. That is, the liquid crystal display device 1A in this modification has one internal haze structure and two external haze structures. The two external haze structures are present at both interfaces of the air layer 20. In this modification, the interface of the air layer 20 on the first display panel 100 side (specifically, the interface between the air layer 20 and the optical member 400) and the interface of the air layer 20 on the second display panel 200A side (specifically). Is provided with an uneven structure 10 at each of the air layer 20 and the interface between the second display panel 200A).

As a result, the occurrence of moire can be effectively suppressed, and the occurrence of newton rings can be further suppressed as compared with the liquid crystal display device 1 in the above embodiment. Therefore, it is possible to further suppress the deterioration of the image quality of the image displayed by the liquid crystal display device 1A.

Further, in this modification, the external haze value of the external haze structure_ (first uneven structure 11) of the optical member 400 is set to Ho1, and the external haze structure (second uneven structure 12) provided on the second display panel 200A is set. Assuming that the external haze value is Ho2 and the internal haze value of the internal haze structure of the optical member 400 is Hi, it is preferable that the relational expression of Ho2 ≦ Ho1 <Hi is satisfied. That is, the internal haze value should be maximized, and the plurality of external haze values should be increased as they are closer to the observer side.

As a result, the occurrence of moire and the occurrence of Newton ring can be effectively suppressed. In this case, the larger the internal haze value and the external haze value, the wider the distance between the member and the black matrix of the second display panel 200A can be secured. Therefore, the larger the internal haze value and the external haze value, the wider the second display panel. The light transmitted through the black matrix of 200A is sufficiently spread before being incident, and the light transmitted through the second display panel 200A can be sufficiently diffused. For example, the external haze value of the first concavo-convex structure 11 and the second concavo-convex structure 12 is preferably less than 50%, and the internal haze value is preferably 50% or more. As an example, the external haze value of the first concavo-convex structure 11 and the second concavo-convex structure 12 is 20% to 25%, and the internal haze value is 80%. In addition, Ho2 <Ho1 <Hi may be used.

Further, not only the concave-convex structure 10 is provided on the first display panel 100 side as in the liquid crystal display device 1A in the present modification, but also the concave-convex structure 10 is provided on the second display panel 200A side so that the optical member 400 can be formed. It is possible to prevent the surfaces of both the first display panel 100 and the second display panel 200A provided from being scratched during handling.

(Modification 2 of Embodiment 1)
FIG. 7 is a cross-sectional view of the liquid crystal display device 1B according to the second modification of the first embodiment.

As shown in FIG. 7, the liquid crystal display device 1B in the present modification has the same as the liquid crystal display device 1A shown in FIG. 6, as the concavo-convex structure 10, the first concavo-convex structure 11 and the second concavo-convex structure 12. It has a haze structure.

As shown in FIG. 7, in the liquid crystal display device 1B in this modified example, the optical member 400 having the concave-convex structure 10 is attached to the second display panel 200 instead of the first display panel 100A.

In this modification, the first uneven structure 11 is an uneven structure 10 provided as a surface structure of the surface of the first display panel 100A on the side of the second display panel 200. The second concavo-convex structure 12 is a concavo-convex structure 10 provided as a surface structure of the optical member 400 bonded to the second display panel 200.

In this modification, the first display panel 100A is a liquid crystal display panel with an AG function having a surface structure that has been subjected to AG treatment as the first uneven structure 11.

Specifically, the first uneven structure 11 can be provided as a surface structure of the first polarizing plate 121A on the second display panel 200A side of the pair of first polarizing plates 121A and 122. As an example, as the first polarizing plate 121A having the first uneven structure 11, a polarizing plate with an AG function that has been subjected to AG treatment can be used.

As the first display panel 100A having the first uneven structure 11, the same one as the second display panel 200A having the second uneven structure 12 shown in FIG. 6 can be used, but different ones may be used.

As described above, the liquid crystal display device 1B in the present modification has one internal haze structure and two external haze structures, similarly to the liquid crystal display device 1A (FIG. 6) in the above modification 1. Two external haze structures are present at both interfaces of the air layer 20.

As a result, as in the case of the liquid crystal display device 1A in the first modification, the occurrence of moire can be effectively suppressed, and the occurrence of Newton ring can be further suppressed as compared with the liquid crystal display device 1 in the above embodiment. it can. Therefore, it is possible to further suppress the deterioration of the image quality of the image displayed by the liquid crystal display device 1B.

Further, in this modification, the external haze value of the external haze structure (first uneven structure 11) provided on the first display panel 100A is set to Ho1, the internal haze value of the internal haze structure of the optical member 400 is set to Hi, and the optics are set. Assuming that the external haze value of the external haze structure_ (second uneven structure 12) of the member 400 is Ho2, it is preferable that the relational expression Ho2 ≦ Ho1 <Hi is satisfied as in the liquid crystal display device 1A in the first modification. .. As a result, the occurrence of moire and the occurrence of Newton ring can be effectively suppressed. In addition, Ho2 <Ho1 <Hi may be used.

Further, also in the liquid crystal display device 1B in the present modification, since the uneven structure 10 is provided on both the first display panel 100A side and the second display panel 200 side, the first display panel 100A and the optical member 400 are provided. It is possible to prevent the surface of both of the second display panels 200 from being scratched during handling.

(Modification 3 of Embodiment 1)
FIG. 8 is a cross-sectional view of the liquid crystal display device 1C according to the third modification of the first embodiment.

As shown in FIG. 8, the liquid crystal display device 1C in the present modification is provided with an optical member 400 on the second display panel 200 in addition to the liquid crystal display device 1 shown in FIG. That is, in the liquid crystal display device 1C in this modification, the optical member 400 having the concave-convex structure 10 is attached not only to the first display panel 100 but also to the second display panel 200.

Therefore, in the liquid crystal display device 1C in the present modification, the external haze structure (first uneven structure 11) and the internal haze structure exist on the first display panel 100 side via the air layer 20, and the second display panel 200 There is an external haze structure (second uneven structure 12) and an internal haze structure on the side. That is, the liquid crystal display device 1C in this modification has two external haze structures and two internal haze structures.

The optical member 400 provided on the first display panel 100 and the optical member 400 provided on the second display panel 200 may have the same external haze value, but may have different external haze values. It may have.

As described above, the liquid crystal display device 1C in the present modification has two internal haze structures and two external haze structures, and the two external haze structures exist at both interfaces of the air layer 20. ing.

As a result, as compared with the liquid crystal display device 1 in the above embodiment, it is possible to further suppress the occurrence of moire and further suppress the occurrence of Newton ring. Therefore, it is possible to further suppress the deterioration of the image quality of the image displayed by the liquid crystal display device 1C.

Further, in this modification, the internal haze value of the internal haze structure and the external haze value of the external haze structure (first uneven structure 11) of the optical member 400 (first optical member) provided on the first display panel 100 are set. The internal haze value of the internal haze structure and the external haze value of the external haze structure (second uneven structure 12) of the optical member 400 (second optical member) provided on the second display panel 200 are set to Hi1 and Ho1, respectively. Assuming that Hi2 and Ho2, it is preferable that the relational expression of Ho2 ≦ Ho1 <Hi2 ≦ Hi1 is satisfied. As a result, the occurrence of moire and the occurrence of Newton ring can be effectively suppressed. In addition, Ho2 <Ho1 <Hi2 <Hi1 may be used.

Further, also in the liquid crystal display device 1C in this modification, since the uneven structure 10 is provided on both the first display panel 100 side and the second display panel 200 side, the first display panel 100 provided with the optical member 400 is provided. It is possible to prevent the surface of both the second display panel 200 provided with the optical member 400 and the second display panel 200 from being scratched during handling.

(Modification 4 of Embodiment 1)
FIG. 9 is a cross-sectional view of the liquid crystal display device 1D according to the fourth modification of the first embodiment.

In the liquid crystal display device 1 shown in FIG. 2 above, the optical member 400 in which the light diffusing material 411 is contained in the base material layer 410 is used, but as shown in FIG. 9, the liquid crystal display device in this modification In 1D, an optical member 400A in which the base material layer 410 does not contain a light diffusing material is used.

That is, the optical member 400A used in this modification is an optical film that does not include a light diffusion layer having an internal haze value. Therefore, the optical member 400A has a light diffusing action due to the uneven structure 10 (external haze structure), but does not have a light diffusing action due to the light diffusing material (internal haze structure).

As described above, even in the liquid crystal display device 1D shown in FIG. 9, since the uneven structure 10 is provided at the interface with the air layer 20, the occurrence of Newton ring can be suppressed. Therefore, it is possible to suppress deterioration of the image quality of the image displayed by the liquid crystal display device 1D.

In addition, this modification may be applied to the optical member 400 shown in the liquid crystal display devices 1A, 1B and 1C shown in FIGS. 6, 7 and 8.

(Embodiment 2)
Next, the liquid crystal display device 2 according to the second embodiment will be described with reference to FIG. FIG. 10 is a cross-sectional view of the liquid crystal display device 2 according to the second embodiment.

In the liquid crystal display device 2 of the present embodiment, the optical member 450 is arranged between the first display panel 100 and the second display panel 200 as in the first embodiment, but in the present embodiment Unlike the first embodiment, the optical member 450 is not attached to either the first display panel 100A or the second display panel 200A. That is, the first display panel 100A, the optical member 450, and the second display panel 200A are arranged separately from each other without being bonded by a joining member such as an adhesive sheet or an adhesive. For example, the optical member 450 is held together with the first display panel 100A and the second display panel 200A by the holding member that holds the first display panel 100A and the second display panel 200A.

Therefore, in the liquid crystal display device 1 according to the first embodiment, the air layer 20 between the first display panel 100 and the second display panel 200 is one layer, whereas the liquid crystal display according to the present embodiment is one layer. In the device 2, the air layer 20 includes a first air layer 21 existing between the first display panel 100A and the optical member 450, and a second air layer existing between the second display panel 200A and the optical member 450. There will be two layers with 22. That is, in the present embodiment, there are two pairs of interfaces between the first display panel 100A and the second display panel 200A and the air layer 20.

Therefore, in the liquid crystal display device 2 of the present embodiment, a concavo-convex structure 10 having a predetermined external haze value is provided at each interface of the two air layers of the first air layer 21 and the second air layer 22. Specifically, as shown in FIG. 10, the concavo-convex structure 10 in the present embodiment is provided at the interface between the first concavo-convex structure 11 provided at the interface of the first air layer 21 and the second air layer 22. Also includes a second uneven structure 12.

As a result, when the first display panel 100A, the second display panel 200A, and the optical member 450 are laminated without being bonded to each other, the first air layer 21 exists between the first display panel 100A and the optical member 450. Even if the second air layer 22 is present between the second display panel 200A and the optical member 450, the occurrence of Newton ring can be suppressed. Therefore, it is possible to prevent deterioration of the image quality of the image displayed by the liquid crystal display device 2.

Further, even in the liquid crystal display device 2 of the present embodiment, the first display panel 100A and the second display panel 200A are not bonded to each other. That is, the first display panel 100A and the second display panel 200A are laminated without using an adhesive. As a result, the liquid crystal display device 2 can be manufactured at low cost.

Moreover, in the liquid crystal display device 2 of the present embodiment, the optical member 450 is not attached to either the first display panel 100A or the second display panel 200A. That is, the optical member 450 is inserted between the first display panel 100A and the second display panel 200A without using an adhesive. As a result, the liquid crystal display device 2 can be manufactured at a lower cost than the liquid crystal display device 1 in the first embodiment. Further, since the optical member 450 is not attached to either the first display panel 100A or the second display panel 200A, a line is formed when the first display panel 100A and the second display panel 200A and the optical member 450 are attached to each other. It is possible to prevent the warp of the optical member 450 or the warp of the first display panel 100A and the second display panel 200A caused by the difference in expansion coefficient. Therefore, the optical member 450 can be selected without worrying about the difference in coefficient of linear expansion between the first display panel 100A and the second display panel 200A. That is, the range of selection of the optical member 450 can be expanded, and the optical member 450 suitable for the purpose can be freely selected.

Further, in the liquid crystal display device 2 of the present embodiment, the first uneven structure 11 is provided as a surface structure of the surface of the optical member 450 of the first display panel 100A or the surface of the optical member 450 on the first display panel 100A side. ing. Further, the second uneven structure 12 is provided as a surface structure of the surface of the second display panel 200A on the optical member 450 side or the surface of the optical member 450 on the second display panel 200A side. That is, the first uneven structure 11 is provided at the interface of the first air layer 21 on the first display panel 100A side, and the second uneven structure 12 is the interface of the second air layer 22 on the second display panel 200A side. It is provided in. As an example, the first display panel 100A having the first concavo-convex structure 11 and the second display panel 200A having the second concavo-convex structure 12 are liquid crystals with an AG function used in the first and second modifications of the first embodiment. It is a display panel.

As described above, only by preparing the first display panel 100A having the first concavo-convex structure 11 and the second display panel 200A having the second concavo-convex structure 12, the first air layer 21 and the second air layer 22 become two. Concavo-convex structure 10 can be easily provided at each of the interfaces of the two air layers.

In this case, the first concave-convex structure 11 is used as the surface structure of the first polarizing plate 121A on the second display panel 200A side of the pair of first polarizing plates 121A and 122, as in the modified example 2 of the first embodiment. Can be provided. Further, the second uneven structure 12 is provided as a surface structure of the second polarizing plate 221A on the first display panel 100A side of the pair of second polarizing plates 221A and 222, similarly to the modified example 21 of the first embodiment. Can be done. As an example, as the first polarizing plate 121A having the first concavo-convex structure 11 and the second polarizing plate 221A having the second concavo-convex structure 12, an AG-treated polarizing plate having an AG function can be used.

As a result, the first polarizing plate 121A having the first uneven structure 11 is attached to the first liquid crystal cell 110, and the second polarizing plate 221A having the second uneven structure 12 is attached to the second liquid crystal cell 210. The concave-convex structure 10 can be easily provided at each of the interfaces of the two air layers of the one air layer 21 and the second air layer 22.

Further, in the present embodiment, the optical member 450 diffuses the light of the backlight 300 transmitted through the second display panel 200A, similarly to the optical member 400 in the first embodiment. Specifically, the optical member 450 is a sheet-shaped or film-strand diffusing plate, and like the optical member 400 in the first embodiment, the light diffusing material is used as a light diffusing layer having a predetermined internal haze value. It has a dispersed substrate layer.

As a result, as in the first embodiment, moire generated when the first display panel 100A and the second display panel 200A are overlapped with each other can be suppressed, so that the image displayed on the liquid crystal display device 2 can be suppressed. It is possible to further suppress the deterioration of the image quality of the image.

Note that the optical member 450 does not have an uneven structure having an external haze value, unlike the first embodiment. That is, both sides of the optical member 450 are smooth surfaces.

Further, in the liquid crystal display device 2 of the present embodiment, assuming that the external haze value of the first uneven structure 11 is Ho1, the external haze value of the second uneven structure 12 is Ho2, and the internal haze value of the optical member 450 is Hi. , Ho2 ≦ Ho1 <Hi. That is, the internal haze value should be maximized, and the plurality of external haze values should be increased as they are closer to the observer side.

In this case, the larger the internal haze value and the external haze value, the wider the distance between the member and the black matrix of the second display panel 200A can be secured. Therefore, the larger the internal haze value and the external haze value, the wider the second display panel. The light transmitted through the black matrix of 200A is sufficiently spread before being incident, and the light transmitted through the second display panel 200A can be sufficiently diffused. For example, the external haze value of the first concavo-convex structure 11 and the second concavo-convex structure 12 is preferably less than 50%, and the internal haze value is preferably 50% or more. As an example, the external haze value of the first concavo-convex structure 11 and the second concavo-convex structure 12 is 20% to 25%, and the internal haze value is 80%. In addition, Ho2 <Ho1 <Hi2 <Hi may be used.

As a result, it is possible to suppress the occurrence of newton rings while effectively suppressing the occurrence of moire. Therefore, it is possible to achieve both suppression of moire generation and suppression of Newton ring generation, so that a high-quality liquid crystal display device 2 can be realized.

Further, in the liquid crystal display device 2 of the present embodiment, since the uneven structure 10 is provided on both the first display panel 100A and the second display panel 200A, the handling of the first display panel 100A and the second display panel 200A is handled. It is possible to prevent the surface from being scratched at times.

(Modification 1 of Embodiment 2)
FIG. 11 is a cross-sectional view of the liquid crystal display device 2A according to the first modification of the second embodiment.

In the liquid crystal display device 2 shown in FIG. 10, the second uneven structure 12 is provided on the second display panel 200A, but the present invention is not limited to this.

For example, as in the liquid crystal display device 2A shown in FIG. 11, the second uneven structure 12 may be provided as a surface structure of the surface of the optical member 450A on the second display panel 200A side. That is, the second uneven structure 12 is provided at the interface of the second air layer 22 on the optical member 450 side. The second display panel 200 is not provided with the uneven structure 10.

On the other hand, the first uneven structure 11 is provided as a surface structure of the surface of the first display panel 100A on the optical member 450A side, similarly to the liquid crystal display device 2 shown in FIG. Specifically, the first uneven structure 11 is provided as a surface structure of the first polarizing plate 121A. That is, the first uneven structure 11 is provided at the interface of the first air layer 21 on the first display panel 100A side.

As described above, also in the liquid crystal display device 2A shown in FIG. 11, a concavo-convex structure 10 having a predetermined external haze value is provided at each interface of the two air layers of the first air layer 21 and the second air layer 22. ing. As a result, the occurrence of Newton ring can be suppressed as in the liquid crystal display device 2 shown in FIG. Therefore, it is possible to prevent the image quality of the image displayed by the liquid crystal display device 2A from deteriorating.

Further, in FIG. 11, the optical member 450A has a base material layer in which the light diffusing material is dispersed as a light diffusing layer having a predetermined internal haze value, similarly to the optical member 450. That is, the optical member 450A not only has a light diffusing action due to the second uneven structure 12 (external haze structure), but also has a light diffusing action due to the light diffusing material (internal haze structure).

As a result, it is possible to suppress the occurrence of newton rings while effectively suppressing the occurrence of moire.

Further, also in this modification, if the external haze value of the first concavo-convex structure 11 is Ho1, the external haze value of the second concavo-convex structure 12 is Ho2, and the internal haze value of the optical member 450A is Hi, then Ho2 ≦ Ho1 <Hi. It is good to satisfy the relational expression of. In addition, Ho2 <Ho1 <Hi may be used.

(Modification 2 of Embodiment 2)
FIG. 12 is a cross-sectional view of the liquid crystal display device 2B according to the second modification of the second embodiment.

In the liquid crystal display device 2 shown in FIG. 10, the first uneven structure 11 is provided on the first display panel 100A, but the present invention is not limited to this.

For example, as in the liquid crystal display device 2B shown in FIG. 12, the first uneven structure 11 may be provided as a surface structure of the surface of the optical member 450B on the first display panel 100A side. That is, the first uneven structure 11 is provided at the interface of the first air layer 21 on the first display panel 100 side. The first display panel 100 is not provided with the uneven structure 10.

On the other hand, the second uneven structure 12 is provided as a surface structure of the surface of the second display panel 200A on the optical member 450A side, similarly to the liquid crystal display device 2 shown in FIG. Specifically, the second uneven structure 12 is provided as a surface structure of the second polarizing plate 221A. That is, the second uneven structure 12 is provided at the interface of the second air layer 22 on the second display panel 200A side.

As described above, in the liquid crystal display device 2B shown in FIG. 12, similarly to the liquid crystal display device 2 shown in FIG. 10, at the interface of each of the two air layers of the first air layer 21 and the second air layer 22. An uneven structure 10 having a predetermined external haze value is provided. As a result, the occurrence of Newton ring can be suppressed as in the liquid crystal display device 2 shown in FIG. Therefore, it is possible to prevent the image quality of the image displayed by the liquid crystal display device 2B from deteriorating.

Further, in FIG. 12, the optical member 450B has a base material layer in which the light diffusing material is dispersed as a light diffusing layer having a predetermined internal haze value, similarly to the optical member 450. That is, the optical member 450B not only has a light diffusing action due to the first uneven structure 11 (external haze structure), but also has a light diffusing action due to the light diffusing material (internal haze structure).

As a result, it is possible to suppress the occurrence of newton rings while effectively suppressing the occurrence of moire.

Further, also in this modification, if the external haze value of the first concavo-convex structure 11 is Ho1, the external haze value of the second concavo-convex structure 12 is Ho2, and the internal haze value of the optical member 450B is Hi, then Ho2 ≦ Ho1 <Hi. It is good to satisfy the relational expression of. In addition, Ho2 <Ho1 <Hi may be used.

(Modification 3 of Embodiment 2)
FIG. 13 is a cross-sectional view of the liquid crystal display device 2C according to the third modification of the second embodiment.

In the liquid crystal display device 2 shown in FIG. 10, the first uneven structure 11 is provided on the first display panel 100A and the second uneven structure 12 is provided on the second display panel 200A, but the present invention is limited to this. Absent.

For example, as in the liquid crystal display device 2C shown in FIG. 13, the first uneven structure 11 is provided as the surface structure of the surface of the optical member 450C on the first display panel 100 side, and the second uneven structure 12 is optical. It may be provided as a surface structure of the surface of the member 450C on the side of the second display panel 200. That is, the first uneven structure 11 is provided at the interface of the first air layer 21 on the optical member 450C side, and the second uneven structure 12 is provided at the interface of the second air layer 22 on the optical member 450C side. There is. The first display panel 100 and the second display panel 200 are not provided with the uneven structure 10.

As described above, also in the liquid crystal display device 2C shown in FIG. 13, a concavo-convex structure 10 having a predetermined external haze value is provided at each interface of the two air layers of the first air layer 21 and the second air layer 22. ing. As a result, the occurrence of Newton ring can be suppressed as in the liquid crystal display device 2 shown in FIG. Therefore, it is possible to prevent the image quality of the image displayed by the liquid crystal display device 2C from deteriorating.

Further, in FIG. 13, the optical member 450C has a base material layer in which the light diffusing material is dispersed as a light diffusing layer having a predetermined internal haze value, similarly to the optical member 450. That is, the optical member 450C not only has a light diffusing action due to the first concavo-convex structure 11 and the second concavo-convex structure 12 (external haze structure), but also has a light diffusing action due to the light diffusing material (internal haze structure).

As a result, it is possible to suppress the occurrence of newton rings while effectively suppressing the occurrence of moire.

Further, also in this modification, if the external haze value of the first concavo-convex structure 11 is Ho1, the external haze value of the second concavo-convex structure 12 is Ho2, and the internal haze value of the optical member 450C is Hi, then Ho2 ≦ Ho1 <Hi. It is good to satisfy the relational expression of. In addition, Ho2 <Ho1 <Hi may be used.

(Modification 4 of Embodiment 2)
FIG. 14 is a cross-sectional view of the liquid crystal display device 2D according to the fourth modification of the second embodiment.

In the liquid crystal display device 2C shown in FIG. 13 above, an optical member 450C in which a light diffusing material is contained in the base material layer is used, but as shown in FIG. 14, the liquid crystal display device 2D in this modification is used. , An optical member 450D whose base material layer does not contain a light diffusing material is used.

That is, the optical member 450D used in this modification does not include a light diffusion layer having an internal haze value. Therefore, the optical member 450D has a light diffusing effect due to the first concavo-convex structure 11 and the second concavo-convex structure 12 (external haze structure), but does not have a light diffusing effect due to the light diffusing material (internal haze structure).

As described above, also in the liquid crystal display device 2D shown in FIG. 14, a concavo-convex structure 10 having a predetermined external haze value is provided at each interface of the two air layers of the first air layer 21 and the second air layer 22. ing. As a result, the occurrence of Newton ring can be suppressed as in the liquid crystal display device 2C shown in FIG. Therefore, it is possible to suppress deterioration of the image quality of the image displayed by the liquid crystal display device 2D.

Further, in the liquid crystal display device 2D in the present modification, assuming that the external haze value of the first concavo-convex structure 11 is Ho1 and the external haze value of the second concavo-convex structure 12 is Ho2, the relational expression of Ho2 ≦ Ho1 is satisfied. Good. In addition, Ho2 <Ho1 may be satisfied.

By doing so, moire can be effectively suppressed even if the optical member 450D does not include a diffusion layer (internal haze structure).

Further, in this modification, one optical member 450D is inserted between the first display panel 100 and the second display panel 200, but two or more optical members 450D may be inserted. In this case, from the viewpoint of suppressing moire, it is preferable to increase the external haze value as much as the optical member 450D on the observer side, and at least the external haze value of the optical member 450D arranged at the position closest to the observer should be maximized. ..

This modification can also be applied to the liquid crystal display devices 2, 2A, 2B and 2C shown in FIGS. 10, 11, 12 and 13.

(Embodiment 3)
FIG. 15 is a cross-sectional view of the liquid crystal display device 3 according to the third embodiment.

As shown in FIG. 15, the liquid crystal display device 3 in the present embodiment has a configuration in which the optical member 400 is replaced with the optical member 450C shown in FIG. 13 in the liquid crystal display device 2 shown in FIG.

In the liquid crystal display devices 2 to 2D shown in FIGS. 10 to 14, the uneven structure 10 is provided on only one of the pair of interfaces in the first air layer 21 and only one of the pair of interfaces in the second air layer 22. However, in the liquid crystal display device 3 of the present embodiment, the concave-convex structure 10 is provided at both the pair of interfaces in the first air layer 21 and the pair of interfaces in the second air layer 22. That is, in the liquid crystal display device 3 of the present embodiment, as the concave-convex structure 10, four external haze structures of a first concave-convex structure 11, a second concave-convex structure 12, a third concave-convex structure 13 and a fourth concave-convex structure 14 are provided. ing.

Specifically, the concavo-convex structure 10 is provided at the interface between the first concavo-convex structure 11 provided at the interface of the first air layer 21 on the first display panel 100A side and the optical member 450C side of the first air layer 21. The second concavo-convex structure 12 provided at the interface of the second air layer 22 on the optical member 450C side, and the third concavo-convex structure 13 provided at the interface of the second air layer 22 on the second display panel 200A side. 4 Concavo-convex structure 14 is included.

In the present embodiment, the first uneven structure 11 is a concave-convex structure 10 provided as a surface structure of the first display panel 100A. The second concavo-convex structure 12 is a concavo-convex structure 10 provided as a surface structure of the surface of the optical member 450C on the first display panel 100A side. Further, the third uneven structure 13 is a concave-convex structure 10 provided as a surface structure of the surface of the optical member 450C on the second display panel 200A side. Further, the fourth uneven structure 14 is an uneven structure 10 provided as a surface structure of the second display panel 200A.

As an example, the first display panel 100A and the second display panel 200A have surface structures that have been subjected to AG treatment as the first concavo-convex structure 11 and the fourth concavo-convex structure 14, similar to the liquid crystal display device 2 in the second embodiment. It is a liquid crystal display panel with an AG function having.

As described above, the liquid crystal display device 3 in the present embodiment has one internal haze structure and four external haze structures.

As a result, the occurrence of moire can be effectively suppressed, and the occurrence of newton rings can be further suppressed as compared with the liquid crystal display device 2 in the above embodiment. Therefore, it is possible to further suppress the deterioration of the image quality of the image displayed by the liquid crystal display device 3.

Further, in the present embodiment, the external haze values of the four external haze structures of the first concavo-convex structure 11, the second concavo-convex structure 12, the third concavo-convex structure 13 and the fourth concavo-convex structure 14 provided as the external haze structure are set. Assuming that Ho1, Ho2, Ho3 and Ho4 are used and the internal haze value of the internal haze structure of the optical member 450C is Hi, it is preferable that the relational expression of Ho4 ≦ Ho3 ≦ Ho2 ≦ Ho1 <Hi is satisfied. That is, the internal haze value should be maximized, and the plurality of external haze values should be increased as they are closer to the observer side. As a result, the occurrence of moire and the occurrence of Newton ring can be effectively suppressed. In addition, Ho4 <Ho3 <Ho2 <Ho1 <Hi may be used.

Further, in the liquid crystal display device 3 of the present embodiment, similarly to the liquid crystal display device 2 of the second embodiment, the concave-convex structure 10 is provided on both the first display panel 100A and the second display panel 200A. , It is possible to prevent the surfaces from being scratched during handling of the first display panel 100A and the second display panel 200A.

(Modification 1 of Embodiment 3)
FIG. 16 is a cross-sectional view of the liquid crystal display device 3A according to the first modification of the third embodiment.

As shown in FIG. 16, in the liquid crystal display device 3 shown in FIG. 15, the liquid crystal display device 3A in the present modification attaches the optical member 400 (optical film) to the first display panel 100 and is attached to the base material layer. The optical member 450C containing the light diffusing material is replaced with the optical member 450D in which the base material layer does not contain the light diffusing material. That is, the optical member 450D used in this modification has a light diffusing action due to the concave-convex structure 10 (external haze structure), but does not have a light diffusing action due to the light diffusing material (internal haze structure).

Similarly to the liquid crystal display device 3 in the third embodiment, the liquid crystal display device 3A in this modification also has irregularities on both the pair of interfaces in the first air layer 21 and the pair of interfaces in the second air layer 22. The structure 10 is provided. That is, even in the liquid crystal display device 3A in this modification, as the concave-convex structure 10, the first concave-convex structure 11 provided at the interface of the first air layer 21 on the first display panel 100 side and the optical member of the first air layer 21 The second uneven structure 12 provided at the interface on the 450D side, the third uneven structure 13 provided at the interface on the optical member 450D side of the second air layer 22, and the second display panel 200A side of the second air layer 22. It has four external haze structures with a fourth uneven structure 14 provided at the interface between the two.

However, in the liquid crystal display device 3 according to the third embodiment, the first uneven structure 11 is provided as the surface structure of the first display panel 100A, but in the liquid crystal display device 3A in this modified example, the first display panel 100 A first uneven structure 11 is provided as a surface structure of the optical member 400 bonded to the above.

Further, the liquid crystal display device 3A in this modification also has one internal haze structure like the liquid crystal display device 3 in the third embodiment.

However, in the liquid crystal display device 3 according to the third embodiment, the optical member 450C arranged between the first air layer 21 and the second air layer 22 has an internal haze structure. In the liquid crystal display device 3A, the optical member 450D does not have an internal haze structure, and the optical member 400 bonded to the first display panel 100 has an internal haze structure.

As described above, the liquid crystal display device 3A in the present modification also has one internal haze structure and four external haze structures, similarly to the liquid crystal display device 3 in the above embodiment.

As a result, the occurrence of moire can be effectively suppressed, and the occurrence of newton rings can be further suppressed as compared with the liquid crystal display device 2 in the above embodiment. Therefore, it is possible to further suppress the deterioration of the image quality of the image displayed by the liquid crystal display device 3A.

Further, also in this modification, the external haze values of the four external haze structures of the first concavo-convex structure 11, the second concavo-convex structure 12, the third concavo-convex structure 13 and the fourth concavo-convex structure 14 are set to Ho1, Ho2, Ho3 and Ho4, respectively. Assuming that the internal haze value of the internal haze structure of the optical member 400 is Hi, it is preferable that the relational expression of Ho4 ≦ Ho3 ≦ Ho2 ≦ Ho1 <Hi is satisfied as in the third embodiment. As a result, the occurrence of moire and the occurrence of Newton ring can be effectively suppressed. In addition, Ho4 <Ho3 <Ho2 <Ho1 <Hi may be used.

Further, in the liquid crystal display device 3A according to the present embodiment, the uneven structure 10 is provided on both the first display panel 100 side and the second display panel 200A side. As a result, it is possible to prevent the surfaces of the first display panel 100 and the second display panel 200A provided with the optical member 400 from being scratched during handling.

(Modification 2 of Embodiment 3)
FIG. 17 is a cross-sectional view of the liquid crystal display device 3B according to the second modification of the third embodiment.

In the liquid crystal display device 3 shown in FIG. 15, an optical member 450C in which a light diffusing material is contained in the base material layer was used, but as shown in FIG. 17, the liquid crystal display device 3B in this modification is described above. Similar to the first modification of the third embodiment, the optical member 450D whose base material layer does not contain a light diffusing material is used.

As described above, also in the liquid crystal display device 3B in the present modification, similarly to the liquid crystal display device 3 in the third embodiment, both the pair of interfaces in the first air layer 21 and the pair of interfaces in the second air layer 22 Concavo-convex structure 10 is provided on both sides. That is, even in the liquid crystal display device 3B in this modification, as the concave-convex structure 10, the first concave-convex structure 11 provided at the interface on the first display panel 100A side of the first air layer 21 and the optical member of the first air layer 21 The second uneven structure 12 provided at the interface on the 450D side, the third uneven structure 13 provided at the interface on the optical member 450D side of the second air layer 22, and the second display panel 200A side of the second air layer 22. It has four external haze structures with a fourth uneven structure 14 provided at the interface between the two.

As a result, the occurrence of moire can be effectively suppressed, and the occurrence of newton rings can be further suppressed as compared with the liquid crystal display device 2 in the above embodiment. Therefore, it is possible to further suppress the deterioration of the image quality of the image displayed by the liquid crystal display device 3B.

Further, also in this modification, the external haze values of the four external haze structures of the first concavo-convex structure 11, the second concavo-convex structure 12, the third concavo-convex structure 13 and the fourth concavo-convex structure 14 are set to Ho1, Ho2, Ho3 and Ho4, respectively. Then, it is preferable that the relational expression of Ho4 ≦ Ho3 ≦ Ho2 ≦ Ho1 is satisfied as in the third embodiment. As a result, even if the optical member 450D does not include a diffusion layer (internal haze structure), it is possible to suppress the occurrence of newton rings while effectively suppressing moire. In addition, Ho4 <Ho3 <Ho2 <Ho1 may be used.

Further, also in the liquid crystal display device 3B of the present embodiment, the uneven structure 10 is provided on both the first display panel 100A and the second display panel 200A. As a result, it is possible to prevent the surfaces of the first display panel 100A and the second display panel 200A from being scratched during handling.

In this modification, one optical member 450D is inserted between the first display panel 100A and the second display panel 200A, but two or more optical members 450D may be inserted. In this case, from the viewpoint of suppressing moire, it is preferable to increase the external haze value as much as the optical member 450D on the observer side, and at least the external haze value of the optical member 450D arranged at the position closest to the observer should be maximized. ..

(Modification example)
The liquid crystal display device according to the present disclosure has been described above based on the first, second, and third embodiments, but the present disclosure is not limited to the first, second, and third embodiments.

For example, in the first embodiment, as shown in FIGS. 2 and 6, the first display panel 100 and the second display panel 200 are arranged in a state of being completely separated via the air layer 20. The state is shown as an example, but the present invention is not limited to this. If an air layer is partially present between the first display panel 100 and the second display panel 200, the first display panel 100 and the second display panel 200 may be partially in contact with each other. In this case, even if there is a slight distortion in the first display panel 100 and the second display panel 200, it is slight when the first display panel 100 and the second display panel 200 are overlapped with each other. Air layer will be partially unevenly distributed. That is, at first glance, even if there is no air layer between the first display panel 100 and the second display panel 200, there is a slight amount between the first display panel 100 and the second display panel 200. There may be an air layer. That is, even in such a case, a Newton ring is generated. Therefore, by providing the concave-convex structure 10 at the interface with the air layer existing between the first display panel 100 and the second display panel 200, Newton The generation of rings can be suppressed.

Further, in the above-described first, second, and third embodiments, two display panels are used, but the present invention is not limited to this. For example, a plurality of display panels of three or more may be used. Also in this case, at least one uneven structure may be provided at each interface of the plurality of air layers existing between the two adjacent display panels.

In addition, various modifications that can be considered by those skilled in the art are applied to the above-described embodiments and modifications, and the components and functions of the embodiments and modifications are arbitrarily combined without departing from the spirit of the present disclosure. The form realized by this is also included in the present disclosure.

1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 2D, 3, 3A, 3B Liquid crystal display device 10 Concavo-convex structure 11 First concavo-convex structure 12 Second concavo-convex structure 13 Third concavo-convex structure 14 Fourth concavo-convex Structure 20 Air layer 21 1st air layer 22 2nd air layer 100, 100A 1st display panel 101 1st image display area 102 1st source driver 103 1st gate driver 110 1st liquid crystal cell 111 1st TFT substrate 112 1st opposed Substrate 113 First liquid crystal layer 121, 121A, 122 First polarizing plate 200, 200A Second display panel 201 Second image display area 202 Second source driver 203 Second gate driver 210 Second liquid crystal cell 211 Second TFT board 212 Second Opposing substrate 213 Second liquid crystal layer 221, 221A, 222 Second polarizing plate 300 Backlight 400, 401, 402, 400A, 450, 450A, 450B, 450C, 450D Optical member 410 Base material layer 411 Light diffusing material 420 Particles 430 Binder 510 Timing controller 520 Timing controller 530 Image processing unit

Claims (28)

The first display panel including the first liquid crystal cell and
A second display panel that includes a second liquid crystal cell and faces the first display panel ,
An optical member arranged between the first display panel and the second display panel is provided.
The optical member is attached to the surface of the first display panel on the second display panel side.
The optical member has a light diffusion layer having a predetermined internal haze value and a first uneven structure provided as a surface structure of the optical member.
A second uneven structure is provided as a surface structure of the surface of the second display panel on the side of the first display panel.
Assuming that the external haze value of the first concavo-convex structure is Ho1, the external haze value of the second concavo-convex structure is Ho2, and the internal haze value of the optical member is Hi.
Satisfy the relational expression Ho2 ≤ Ho1 <Hi,
Liquid crystal display device. With more backlight
The first liquid crystal cell, the second liquid crystal cell, and the backlight overlap in the order of the first liquid crystal cell, the second liquid crystal cell, and the backlight.
The liquid crystal display device according to claim 1. The external haze value of the optical member is less than 50%.
The liquid crystal display device according to claim 1 or 2 . The internal haze value of the optical member is 50% or more.
The liquid crystal display device according to any one of claims 1 to 3 . The first display panel including the first liquid crystal cell and
A second display panel that includes a second liquid crystal cell and faces the first display panel,
An optical member arranged between the first display panel and the second display panel is provided.
A first uneven structure is provided as a surface structure of the surface of the first display panel on the side of the second display panel.
The optical member is attached to the surface of the second display panel on the first display panel side.
The optical member has a light diffusion layer having a predetermined internal haze value and a second uneven structure provided as a surface structure of the optical member.
Assuming that the external haze value of the first concavo-convex structure is Ho1, the external haze value of the second concavo-convex structure is Ho2, and the internal haze value of the optical member is Hi.
Satisfy the relational expression Ho2 ≤ Ho1 <Hi
Liquid crystal display device. With more backlight
The first liquid crystal cell, the second liquid crystal cell, and the backlight overlap in the order of the first liquid crystal cell, the second liquid crystal cell, and the backlight.
The liquid crystal display device according to claim 5. The external haze value of the optical member is less than 50%.
The liquid crystal display device according to claim 5 or 6 . The internal haze value of the optical member is 50% or more.
The liquid crystal display device according to any one of claims 5 to 7 . The first display panel including the first liquid crystal cell and
A second display panel that includes a second liquid crystal cell and faces the first display panel,
An optical member arranged between the first display panel and the second display panel is provided.
The optical member is attached to each of the surface of the first display panel on the side of the second display panel and the surface of the second display panel on the side of the first display panel.
The first optical member, which is the optical member bonded to the first display panel, has a first uneven structure provided as a surface structure.
The second optical member, which is the optical member bonded to the second display panel, has a second uneven structure provided as a surface structure.
Each of the first optical member and the second optical member has a light diffusion layer having a predetermined internal haze value.
The external haze value of the first concavo-convex structure is Ho1, the external haze value of the second concavo-convex structure is Ho2, the internal haze value of the first optical member is Hi1, and the internal haze value of the second optical member. When the shall be the Hi2,
Satisfy the relational expression of Ho2≤Ho1 <Hi2≤Hi1.
Liquid crystal display device. With more backlight
The first liquid crystal cell, the second liquid crystal cell, and the backlight overlap in the order of the first liquid crystal cell, the second liquid crystal cell, and the backlight.
The liquid crystal display device according to claim 9. The first display panel including the first liquid crystal cell and
A second display panel that includes a second liquid crystal cell and faces the first display panel,
An optical member arranged between the first display panel and the second display panel is provided.
It includes a first air layer existing between the first display panel and the optical member, and a second air layer existing between the second display panel and the optical member.
It includes a first uneven structure provided between the first display panel and the optical member, and a second uneven structure provided between the second display panel and the optical member.
Assuming that the external haze value of the first uneven structure is Ho1 and the external haze value of the second uneven structure is Ho2,
Satisfy the relational expression of Ho2 ≤ Ho1
Liquid crystal display device. With more backlight
The first liquid crystal cell, the second liquid crystal cell, and the backlight overlap in the order of the first liquid crystal cell, the second liquid crystal cell, and the backlight.
The liquid crystal display device according to claim 11. The first uneven structure is provided as a surface structure of the surface of the first display panel on the optical member side or the surface of the optical member on the first display panel side.
The second uneven structure is provided as a surface structure of the surface of the second display panel on the optical member side or the surface of the optical member on the second display panel side.
The liquid crystal display device according to claim 11 . The first display panel has a pair of first polarizing plates that sandwich the first liquid crystal cell.
The first uneven structure is provided as a surface structure of the first polarizing plate on the second display panel side of the pair of first polarizing plates.
The liquid crystal display device according to claim 11 . The second display panel has a pair of second polarizing plates that sandwich the second liquid crystal cell.
The second uneven structure is provided as a surface structure of the second polarizing plate on the first display panel side of the pair of second polarizing plates.
The liquid crystal display device according to claim 14 . The first uneven structure is provided as a surface structure of the surface of the first display panel on the optical member side.
The second uneven structure is provided as a surface structure of the surface of the optical member on the side of the second display panel.
The liquid crystal display device according to claim 11 . The first uneven structure is provided as a surface structure of the surface of the optical member on the side of the first display panel.
The second uneven structure is provided as a surface structure of the surface of the second display panel on the optical member side.
The liquid crystal display device according to claim 11 . The first uneven structure is provided as a surface structure of the surface of the first display panel on the optical member side.
The second uneven structure is provided as a surface structure of the surface of the second display panel on the optical member side.
The liquid crystal display device according to claim 11 . The optical member does not include a light diffusing layer having an internal haze value.
The liquid crystal display device according to claim 11 . The optical member has a light diffusing layer having a predetermined internal haze value.
The liquid crystal display device according to any one of claims 11 to 19 . Assuming that the external haze value of the first concavo-convex structure is Ho1, the external haze value of the second concavo-convex structure is Ho2, and the internal haze value of the optical member is Hi, the relational expression of Ho2 ≦ Ho1 <Hi is satisfied.
The liquid crystal display device according to claim 20 . The first display panel including the first liquid crystal cell and
A second display panel that includes a second liquid crystal cell and faces the first display panel,
An optical member arranged between the first display panel and the second display panel is provided.
It includes a first air layer existing between the first display panel and the optical member, and a second air layer existing between the second display panel and the optical member.
The first concavo-convex structure provided on the surface of the first display panel on the first air layer side, the second concavo-convex structure provided on the surface of the optical member on the first air layer side, and the optical member. The third concavo-convex structure provided on the surface on the second air layer side and the fourth concavo-convex structure provided on the surface on the second air layer side of the second display panel are included.
The external haze value of the first concavo-convex structure is Ho1, the external haze value of the second concavo-convex structure is Ho2, the external haze value of the third concavo-convex structure is Ho3, and the external haze value of the fourth concavo-convex structure is Ho4. Then
Satisfy the relational expression of Ho4 ≤ Ho3 ≤ Ho2 ≤ Ho1.
Liquid crystal display device. The first uneven structure is provided as a surface structure of the surface of the first display panel on the side of the second display panel.
The second uneven structure is provided as a surface structure of the surface of the optical member on the side of the first display panel.
The third uneven structure is provided as a surface structure of the surface of the optical member on the side of the second display panel.
The fourth uneven structure is provided as a surface structure of the surface of the second display panel on the side of the first display panel.
The liquid crystal display device according to claim 22 . The optical member does not include a light diffusing layer having an internal haze value.
The liquid crystal display device according to claim 22 or 23 . The optical member has a light diffusing layer having a predetermined internal haze value.
The external haze value of the first concavo-convex structure is Ho1, the external haze value of the second concavo-convex structure is Ho2, the external haze value of the third concavo-convex structure is Ho3, and the external haze value of the fourth concavo-convex structure is Ho4. Assuming that the internal haze value of the optical member is Hi,
The relational expression of Ho4 ≦ Ho3 ≦ Ho2 ≦ Ho1 <Hi is satisfied.
The liquid crystal display device according to claim 22 or 23 . An optical film attached to the surface of the first display panel on the side of the second display panel is provided.
The optical film has a light diffusing layer having a predetermined internal haze value.
The first uneven structure is provided as a surface structure of the optical film.
The second uneven structure is provided as a surface structure of the surface of the optical member on the side of the first display panel.
The third uneven structure is provided as a surface structure of the surface of the optical member on the side of the second display panel.
The fourth uneven structure is provided as a surface structure of the surface of the second display panel on the side of the first display panel.
The liquid crystal display device according to claim 22 . The optical member has a light diffusing layer having a predetermined internal haze value.
The external haze value of the first concavo-convex structure is Ho1, the external haze value of the second concavo-convex structure is Ho2, the external haze value of the third concavo-convex structure is Ho3, and the external haze value of the fourth concavo-convex structure is Ho4. Assuming that the internal haze value of the optical member is Hi,
The relational expression of Ho4 ≦ Ho3 ≦ Ho2 ≦ Ho1 <Hi is satisfied.
The liquid crystal display device according to claim 26 . With more backlight
The first liquid crystal cell, the second liquid crystal cell, and the backlight overlap in the order of the first liquid crystal cell, the second liquid crystal cell, and the backlight.
The liquid crystal display device according to any one of claims 22 to 27.

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