TWM564174U - Light guiding element, backlight module and display device - Google Patents

Abstract

A light guiding component, a backlight module and a display device, the backlight module comprises a light guiding component, a light source and an optical film, and the display device comprises a backlight module and a display panel, wherein the light guiding component is used on the light emitting surface of the light guiding body thereof Forming a light-emitting surface structure comprising a plurality of light-guiding hairline patterns, the roughness of the light-emitting surface microstructure is increasing from the light-incident side toward the reverse light-incident side, and the light-reflecting surface of the light-guiding body forms a plurality of reflective surface microstructures The chromatic aberration of the light emitted by the optical element can be adjusted to a better state.

Description

Light guiding element, backlight module and display device

The present invention relates to a light guiding element, a backlight module, and a display device applied to a display such as a liquid crystal display.

For example, in a conventional display device such as a liquid crystal display (LCD), a backlight unit (BLU) is mainly used to provide a backlight for the display panel. The composition of the conventional backlight module mainly includes a backlight. a light guide plate (or light guide film), a light source and at least one optical film, wherein the light source is disposed outside the light incident side of the light guide plate, and the optical film is disposed outside the light exit surface of the light guide plate. The display panel is disposed outside the optical film of the backlight module.

Thereby, the light emitted by the light source is incident on the light incident side of the light guide plate into the light guide plate, and the incident light is transmitted toward the other side of the light guide plate with respect to the light incident side by the total reflection function of the light guide plate. In the process of light transmission, after a plurality of microstructures of the reflecting surface are used to generate different reflection angles, the light emitted by the light source is dispersed through the light emitting surface of the light guide plate, and then the light is scattered through the optical film or Brightening function to provide a uniform brightness backlight to the display panel.

Among the many known display devices, some display devices use a light guide plate of the backlight module to form a plurality of V-shaped microstructures on the reflective surface, thereby changing the light exit angle and light directivity of the light emitted from the light guide plate, thereby improving the light extraction efficiency. With uniformity. However, the light guide plate forms a plurality of V-shaped microstructures on the reflective surface thereof, so that the light emitted by the light guide plate is less likely to be blue in a position close to the light-incident side, and is located away from the light-incident side. The state of bluening is more obvious.

The purpose of the present invention is to provide a light guiding element, a backlight module, and a display device, which solve the problems of blue coloration of the light emitted by the existing light guiding element.

In order to achieve the foregoing, the light guiding device of the present invention comprises: a light guiding body comprising a light emitting surface and a reflecting surface, wherein the light emitting surface and the reflecting surface are respectively located on opposite sides of the light guiding body, The light guiding body is respectively formed on the light emitting surface of the light guiding body on the opposite sides of the light emitting surface, and the light emitting surface microstructure comprises a plurality of light emitting surface microstructures a light guiding hairline pattern, wherein the plurality of light guiding hairline patterns extend substantially perpendicular to the light incident side from the light emitting surface adjacent to the light incident side to adjacent the reverse light incident side, and the light exiting surface microstructure The roughness is increased from the light incident side toward the reverse light incident side; and the plurality of reflective surface microstructures are distributed on the reflective surface of the light guide body.

In the light guiding element as described above, the roughness of the light-emitting surface microstructure is between 0.1 μm and 0.4 μm and includes an end point value.

In the light guiding device as described above, the light guiding body is a light guiding plate or a light guiding film.

In the light guiding element as described above, the reflecting surface microstructure is a convex body that protrudes from the reflecting surface or a concave portion that is recessed from the reflecting surface.

In the light guiding element as described above, the reflective surface microstructure comprises an optical base and two optical sides, the optical base comprising a first optical surface and a second optical surface, the first optical surface facing the input a light side, the second optical surface is opposite to the other side of the light incident side, the first optical surface and the second optical surface are inclined surfaces of different oblique directions and form an asymmetrical shape, and the two optical side portions The first optical surface has a first angle with respect to the reflective mask, and the second optical surface has a second angle with respect to the reflective mask, the first angle and the second angle being acute. And the first angle is greater than the second angle.

In order to achieve the foregoing, the backlight module of the present invention further comprises: a light guiding element as described above; a light source disposed outside the light incident side of the light guiding element; and at least one optical film It is disposed outside the light-emitting surface of the light guiding element.

In order to achieve the foregoing, the display device additionally provided by the present invention comprises: a backlight module as described above; and a display panel disposed outside the optical film of the backlight module.

By creating a light-emitting element, a backlight module, a display device, etc., the main purpose is to form a reflecting surface microstructure by using a reflecting surface of the light guiding body, and a light-emitting surface is formed to form a light-emitting surface microstructure including a plurality of light guiding hair lines. . After the light is incident on the light incident side of the light guiding body, the light emitting angle of the light is changed by using a plurality of reflecting surface microstructures located on the reflecting surface of the light guiding body, so that the light can be deflected vertically when the light emitting surface of the light guiding element is emitted. The light is emitted in the forward direction of the light-emitting surface to increase the luminance. In addition, the light-emitting surface of the light-guiding body forms a light-emitting surface microstructure including a plurality of light-guiding hairline patterns, so that the light-emitting surface of the light-guiding body has an atomization effect, and the bright spot problem is improved.

More importantly, the reflective surface microstructure of the light guiding element reflects the yellow light that is emitted at a large angle in the incident light, so that the chromatic aberration of the light is blue from blue to blue, but The light-emitting surface microstructure formed by the light-emitting surface of the light-guiding body extends from the adjacent light-incident side to a plurality of light-guiding hairline patterns adjacent to the reverse light-incident side in a direction substantially perpendicular to the light-incident side, and the light-emitting surface The roughness of the microstructure is increased from the light entrance side toward the reverse light entrance side, so that the blue light of the original color difference is adjusted by the yellowing effect of the light guide hairline, and the color difference of the light passing through the light guide element is made. It can be tuned to a better state, so that the backlight module can provide a better backlight and the display device has excellent image display quality.

The present invention comprises a light guiding element, a backlight module and a display device. The following describes the technical means adopted by the present invention for achieving a new purpose in conjunction with the drawings and the embodiments of the present invention.

As shown in FIG. 1 to FIG. 3 and FIG. 4, several embodiments of the novel light guiding device 10 are disclosed. As can be seen from the drawings, the light guiding device 10 includes a light guiding body 11 and a The light exiting surface microstructure 12 and the plurality of reflective surface microstructures 13, 13A.

As shown in FIG. 1 to FIG. 3 , the light guiding body 11 can be a plate type light guide plate or a diaphragm type light guide film, and the light guiding body 11 includes a light emitting surface 111 and a reflecting surface 112 . The light-emitting surface 111 and the reflective surface 112 are respectively located on opposite sides of the light-conducting body 11. The light-emitting surface 11 is opposite to the light-emitting surface 111 and a light-incident side 113 and a reverse light-incident side 114, respectively.

As shown in FIG. 1 to FIG. 3, the light-emitting surface microstructure 12 is formed on the light-emitting surface 111 of the light-guiding body 11. The light-emitting surface microstructure 12 includes a plurality of light-guiding hairline patterns 121, and the plurality of guides The light-emitting surface 121 extends substantially perpendicular to the light-incident side 113 from the light-emitting surface 111 adjacent to the light-incident side 113 to the adjacent light-incident side 114, so that the light-emitting surface 111 of the light-guiding body 11 is roughened. The surface roughness of the plurality of light guiding hairline patterns 121 of the light exiting surface microstructure 12 increases from the light incident side 113 toward the reverse light incident side 114. In this embodiment, the roughness of the light-emitting surface microstructure 12 is between 0.1 μm and 0.4 μm and includes an endpoint value. The roughness of the light exiting surface microstructure 12 is adjusted in accordance with the chromatic aberration requirements of the light passing through the light guiding element 10.

As shown in FIG. 2 to FIG. 4, a plurality of the reflective surface microstructures 13 and 13A are distributed on the reflective surface 112 of the light guiding body 11. The reflective surface microstructures 13, 13A may protrude from the reflective surface. The convex body of 112 or a concave portion recessed from the reflecting surface 112. Basically, the reflective surface microstructures 13 and 13A comprise an optical base and two optical sides 133. The optical base comprises a first optical surface 131, 131A and a second optical surface 132, 132A. The first optical surface 131, 131A is facing the light incident side 113, the second optical surface 132, 132A is facing the other side with respect to the light incident side 113, the first optical surface 131, 131A and the second optical surface 132, 132A The two optical sides 133 are respectively located on opposite sides of the optical base, and the first optical surfaces 131 and 131A have a first angle θ1 with respect to the reflective surface 112. The second optical surface 132, 132A has a second angle θ2 with respect to the reflective surface 112. The first angle θ1 and the second angle θ2 are both acute angles, and the first angle θ1 is greater than the second angle θ2.

Regarding the configuration of the optical side portion 133 in the reflective surface microstructures 13, 13A, the reflective surface microstructure 13 of the convex body shown in FIG. 2 and FIG. 3 is taken as an example. Please refer to FIG. 2, the optical side portion 133. Each of the first optical surface unit 134 and the second optical surface unit 135 is an optical surface in a different oblique direction, the first optical surface. The unit 134 is connected to the first optical surface 131 and the reflective surface 112. The second optical surface unit 135 is connected to the second optical surface 132 and the reflective surface 112.

As shown in FIG. 1 to FIG. 3 , the light guiding element 10 forms a reflecting surface microstructure 13 and a light emitting surface 111 by using the reflecting surface 112 of the light guiding body 11 to form a light emitting surface microstructure 12 including a plurality of light guiding hair lines 121 . The plurality of reflective surface microstructures 13 on the reflective surface 112 are utilized during the transmission of the light from the light incident side 113 into the light guide body 11 and toward the reverse light incident side 114, and the reflective surface is microscopically The first optical surface 131 facing the light incident side 113 of the structure 13 and the second optical surface 132 facing the reverse light incident side 114 are inclined surfaces of different oblique directions and are asymmetric, and the first optical surface 131 is smaller than the second optical surface. The protrusion 132 is steep and can change the angle of the light reflected by the reflecting surface 112. When the light is emitted from the light-emitting surface 111 of the light guiding element 10, the light can be emitted more obliquely in the direction perpendicular to the light-emitting surface 111 to increase the luminance. On the other hand, the light-emitting surface 111 of the light-guiding body 11 forms a light-emitting surface microstructure 12 including a plurality of light-guiding hairline patterns 121, which can cause an atomization effect on the light-emitting surface 111 of the light-guiding body 11 to improve the bright spot problem.

In addition to the above functions, the reflective surface microstructure 13 of the light guiding element 10 on the reflecting surface 112 reflects the yellow light which is emitted at a large angle in the incident light, so that the chromatic aberration of the light is yellow to blue. Blue light, but the light-emitting surface microstructure 12 formed by the light-emitting surface 111 of the light-guiding body 11 is extended by its substantially perpendicular to the light-incident side 113 and from the adjacent light-incident side 113 to the adjacent reverse light-incident side 114. a plurality of light guiding hairline patterns 121, and the roughness of the light emitting surface microstructures 12 is increased from the light incident side 113 toward the reverse light incident side 114, so that the blue light of the original color difference is utilized by the light guiding hairline pattern. The yellowing effect of 121 reconciles the color difference, so that the chromatic aberration emitted by the light guiding element 10 can be adjusted to a better state. Moreover, the roughness of the plurality of light guiding hairline patterns 121 of the light exiting surface microstructure 12 is increased from the light incident side 113 toward the reverse light incident side 114, so that the yellowing effect becomes more and more obvious. The original chromatic aberration effect is reconciled from a near-lighting side 113 to a gradual bluening phenomenon away from the light-incident side 113.

As shown in FIG. 5 and FIG. 6 , an embodiment of the backlight module of the present invention is disclosed. The backlight module includes a light guiding component 10 , a light source 20 , and at least one optical film 30 . The shape of the light guiding element 10 is the same as that of the light guiding element 10 disclosed in the foregoing embodiments, and details are not described herein. The light source 20 is disposed outside the light incident side 113 of the light guiding element 10, and the light emitting direction of the light source 20 faces the light incident side 113. The optical film 30 is disposed outside the light-emitting surface 111 of the light guiding element 10 . As shown in FIG. 6, when the number of the optical films 30 is plural, the plurality of optical films 30 are sequentially arranged on the outer side of the light-emitting surface 111 of the light guiding element 10.

The backlight module of the present invention can uniformly scatter the light emitted by the light source 20 through the total reflection inside the light guiding element 10, and utilize the reflective surface microstructure 13 respectively located on the reflective surface 112 of the light guiding body and the light emitting surface 111. The combination of the light-emitting surface microstructures 12 of the majority of the light-guiding hairline patterns 121 provides a harmonic chromatic aberration function or the like. The light emitted through the light-emitting surface 111 of the light-guiding element 10 is connected to the optical film 30 to provide brightness enhancement or uniform diffusion, thereby improving the optical performance of the backlight module as a whole.

As shown in FIG. 7 , an embodiment of the present disclosure is disclosed. The display device includes a backlight module and a display panel 40. The backlight module is constructed as described above, and details are not described herein. The display panel 40 can be a liquid crystal display panel. The display panel 40 is disposed outside the optical film 30 of the backlight module, and provides a necessary backlight when the backlight module displays the image on the display panel 40. .

The above description is only for the disclosure of the embodiments of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art can use the technical content disclosed above without departing from the scope of the novel technology. Equivalent embodiments of equivalent changes are made, but any simple modifications, equivalent changes and modifications made to the above embodiments in accordance with the technical content of the present invention are still within the scope of the present disclosure. Within the scope.

10‧‧‧Light guiding elements
11‧‧‧Lighting body
111‧‧‧Glossy surface
112‧‧‧reflecting surface
113‧‧‧light side
114‧‧‧Reverse light side
12‧‧‧Glossy surface microstructure
121‧‧‧Light guide hairline
13, 13A‧‧‧reflective surface microstructure
131, 13A‧‧‧ first optical surface
132, 132A‧‧‧second optical surface
133‧‧‧Optical side
134‧‧‧First optical surface unit
135‧‧‧Second optical surface unit θ1‧‧‧first angle θ2‧‧‧second angle
20‧‧‧Light source
30‧‧‧Optical diaphragm
40‧‧‧ display panel

1 is a perspective view of an embodiment of the novel light guiding element. 2 is a bottom perspective partial perspective view of the embodiment of the light guiding element shown in FIG. 1. 3 is a side plan view showing the embodiment of the light guiding element shown in FIGS. 1 and 2. 4 is a side plan view showing another embodiment of the novel light guiding element. FIG. 5 is a side plan view showing an embodiment of the backlight module of the present invention. FIG. 6 is a side plan view showing the increase of the number of optical films in the backlight module of the present invention. Figure 7 is a side plan view showing an embodiment of the novel display device.

Claims (8)

A light guiding component includes: a light guiding body, comprising a light emitting surface and a reflecting surface, wherein the light emitting surface and the reflecting surface are respectively located on opposite sides of the light guiding body, and the light guiding body is opposite to the light emitting surface The two sides are respectively a light-incident side and a reverse light-incident side; a light-emitting surface microstructure is formed on the light-emitting surface of the light-guiding body, and the light-emitting surface microstructure comprises a plurality of light-guiding hairline patterns, a light guiding hairline pattern extending substantially perpendicular to the light incident side from the light emitting surface adjacent to the light incident side to adjacent the reverse light incident side, and the roughness of the light exiting surface microstructure is from the light entering side The direction of the opposite light entrance side is increased; and the plurality of reflective surface microstructures are distributed on the reflective surface of the light guiding body. The light guiding element according to claim 1, wherein the roughness of the light-emitting surface microstructure is between 0.1 μm and 0.4 μm and includes an endpoint value. The light guiding element of claim 1, wherein the light guiding body is a light guiding plate or a light guiding film. The light guiding element of claim 2, wherein the light guiding body is a light guiding plate or a light guiding film. The light guiding element according to any one of claims 1 to 4, wherein the reflecting surface microstructure is a convex body protruding from the reflecting surface or a concave portion recessed from the reflecting surface. The light guiding element of claim 5, wherein the reflective surface microstructure comprises an optical base and two optical sides, the optical base comprising a first optical surface and a second optical surface, the first optical surface Facing the light incident side, the second optical surface faces the other side with respect to the light incident side, and the first optical surface and the second optical surface are inclined surfaces of different oblique directions and form an asymmetrical shape. The two optical sides are respectively located at two sides of the optical base, the first optical surface has a first angle with respect to the reflective mask, and the second optical surface has a second angle with respect to the reflective mask, the first angle and the first The two angles are acute and the first angle is greater than the second angle. A backlight module, comprising: the light guiding element according to any one of claims 1 to 6; a light source disposed outside the light incident side of the light guiding element; and at least one optical film It is disposed outside the light-emitting surface of the light guiding element. A display device comprising: a backlight module as claimed in claim 7; and a display panel disposed outside the optical film of the backlight module.