TWI776088B - Light guide plate and display module - Google Patents

Abstract

A light guide plate includes a light guide body, a plurality of reflective microstructures and an atomization layer. The light guide body has a light exit surface, a bottom surface opposite to the light exit surface and a light incident surface connected between the light exit surface and the bottom surface. The reflective microstructures are disposed on the bottom surface and arranged into a reflective pattern to reflect light beam from the light incident surface. The atomization layer is formed on the light exit surface. A display module including the light guide is also provided. The light guide plate and the display module of the present invention have a function of avoiding the discontinuity of the display pattern.

Description

Light guide plate and display module

The present invention relates to a light guide plate and a display module.

At present, for the products of light-emitting lighting panels, a plurality of microstructures arranged in one or more patterns are fabricated on the surface of a light guide plate such as an acrylic plate, and a plurality of light sources are arranged on one side of the light guide plate, so that the light beam of the light source is in the The light is transmitted in the light guide plate and reflected by the microstructures to emit light, thereby displaying one or more light-emitting patterns arranged by a plurality of microstructures.

However, since the microstructure is a rod-like structure that fully reflects the light beam, the light beam reflected by the microstructure has a high degree of directivity, for example, the reflected light beam only changes the vertical traveling direction (such as the normal direction of the light exit surface of the light guide plate). ), while the horizontal travel direction (such as the normal direction of the light incident surface of the light guide plate) does not change. A light source that emits light beams of multiple microstructures will generate light beams with different horizontal light-emitting angles due to the different positions of the microstructures. Therefore, the viewer can only observe the microstructures in a specific area reflecting the light beam of a light source at a fixed position. . Even if the light-emitting lighting panel is provided with a plurality of light sources, these light sources are arranged at an interval, so that the viewer will only see the light beams reflected by part of the microstructures at the same position, so that the originally complete light-emitting display pattern becomes A discontinuous light-emitting display pattern with alternating bright and dark stripes. Furthermore, since the microstructure uses total reflection to reflect the light beam, the angle of the vertical traveling direction of the reflected light beam is further limited. When the viewer moves, the light-emitting pattern cannot be clearly seen.

This "Prior Art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "Prior Art" may contain some that do not constitute the prior art known to those of ordinary skill in the art. In addition, the content disclosed in the "Prior Art" does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it represent that it has been known by those with ordinary knowledge in the technical field before the application of the present invention. know or know.

The present invention provides a light guide plate and a display module, which can avoid the discontinuous phenomenon of display patterns, thereby having good display quality.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above purposes or other purposes, the light guide plate provided by the present invention includes a light guide body, a plurality of reflective microstructures and an atomized layer. The light guide body has a light emitting surface, a bottom surface opposite to the light emitting surface, and a light incident surface connected between the light emitting surface and the bottom surface. The reflective microstructures are arranged on the bottom surface and arranged in a reflective pattern, which is suitable for reflecting light beams from the light incident surface, and the atomized layer is arranged on the light emitting surface.

To achieve one or part or all of the above purposes or other purposes, the display module provided by the present invention includes a light source and the above-mentioned light guide plate. The light source is arranged relative to the light incident surface of the light guide plate.

In an embodiment of the present invention, the atomization layer is a coating layer with a plurality of diffusing particles or a film layer attached to the light-emitting surface.

In an embodiment of the present invention, the atomization layer includes a plurality of atomization microstructures.

The light guide plate of an embodiment of the present invention may further include an auxiliary atomization layer. The atomization layer and the auxiliary atomization layer have different atomization degrees from each other.

In an embodiment of the present invention, the atomized layer covers a partial area of the light emitting surface.

In an embodiment of the present invention, the atomized layer covers at least a part of the reflective microstructures.

In an embodiment of the present invention, the atomized layer is only provided corresponding to the reflection pattern.

In an embodiment of the present invention, the atomization layer has an atomization degree of less than 40%.

In an embodiment of the present invention, the atomization degree is between 5% and 15%.

In an embodiment of the present invention, each reflective microstructure is recessed into the light guide body from the bottom surface.

The light guide plate according to an embodiment of the present invention may further include a plurality of light incident microstructures disposed on the light incident surface.

In an embodiment of the present invention, the light source includes a first light-emitting element and a second light-emitting element. A part of the plurality of reflective microstructures is used for reflecting the light beam emitted by the first light-emitting element, and the other part is used for reflecting the light beam emitted by the second light-emitting element.

In an embodiment of the present invention, the display module is a transparent display.

In the embodiment of the present invention, an atomization layer is arranged on the light-emitting surface of the light guide plate, so that the light-emitting angle of the light beam with high directivity emitted from the light-emitting surface can be increased, so that no matter how the viewer moves, he can see the continuous display pattern.

In order to make the above-mentioned and other objects, features and advantages of the present invention more clearly understood, preferred embodiments are hereinafter described in detail in conjunction with the accompanying drawings.

10, 10a, 10b: Display module

100: light source

110: Substrate

121: The first light-emitting element

122: The second light-emitting element

200, 200a, 200b, 200c, 200d, 200e: light guide plate

210: Light guide body

211: light-emitting surface

212: Underside

213: light incident surface

220: Reflective Microstructure

221: light-receiving surface

222: Backlit surface

230, 230a, 230b: Atomization layer

231, 241: Atomized Microstructure

232: Diffusion Particles

240a, 240b: auxiliary atomization layer

250:Incoming Light Microstructure

F: normal

L, L1, L2: Beam

P1: Reflective Pattern

R1, R2, R3, R4, R5: Regions

θ1: The first included angle

θ2: Second included angle

θ3: the third angle

FIG. 1A is a schematic top view of a display module according to an embodiment of the present invention.

FIG. 1B is a schematic cross-sectional view taken along line A-A of FIG. 1A .

2 is a schematic cross-sectional view of a light guide plate according to another embodiment of the present invention.

3A is a schematic cross-sectional view of a light guide plate according to yet another embodiment of the present invention.

3B is a schematic cross-sectional view of a light guide plate according to yet another embodiment of the present invention.

4 is a schematic cross-sectional view of a light guide plate according to yet another embodiment of the present invention.

FIG. 5A is a schematic diagram of the operation of a display module according to another embodiment of the present invention.

FIG. 5B is a schematic diagram of a display module according to another embodiment of the present invention.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only for referring to the directions of the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the present invention.

1A is a schematic top view of a display module according to an embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view taken along line A-A of FIG. 1A . Referring to FIGS. 1A and 1B , the display module 10 of this embodiment includes a light source 100 and a light guide plate 200 , and the light source 100 can emit a light beam L. The light guide plate 200 includes a light guide body 210 , a plurality of reflective microstructures 220 and an atomization layer 230 . The light guide body 210 has a light exit surface 211 , a bottom surface 212 opposite to the light exit surface 211 , and a light incident surface 213 connected between the light exit surface 211 and the bottom surface 212 . The reflective microstructures 220 are disposed on the bottom surface 212 and are arranged in a reflective pattern P1, and the reflective microstructures 220 are suitable for reflecting the light beam L from the light incident surface 213, and the atomized layer 230 is disposed on the light exit surface 211, so that the display module 10 can A display pattern (not shown) corresponding to the reflection pattern P1 is displayed, and the display pattern seen by the viewer is a continuous light-emitting pattern. In particular, in FIG. 1A , the reflection pattern P1 is shown as a rectangle, but the present invention is not limited to this. In other embodiments, the reflection pattern P1 can be a geometric pattern, a text, a puppet image or various patterns. The viewer can see the corresponding geometric patterns, characters, doll images or display patterns of various patterns. The light source 100 is disposed opposite to the light incident surface 213 of the light guide plate 200 . The display module 10 can be, for example, a transparent display, and a background pattern (not shown) can be arranged under the bottom surface 212. When the display module 10 displays the light-emitting pattern, the background pattern or only the light-emitting pattern can be selectively seen at the same time. When the display module 10 does not display the light-emitting image In this case, the display module 10 can be nearly transparent to see the background pattern, but the present invention is not limited to this. In other embodiments, the display module 10 can be a transparent display without setting a background pattern, which means that the scenery on the other side of the display module 10 opposite to the viewer can be used as the background, and the light-emitting pattern can also be selectively displayed. When the display module 10 does not display the light-emitting pattern, the display module 10 can be nearly transparent, so that the viewer can fully see the scenery behind the display module 10 .

In this embodiment, the atomization layer 230 includes a plurality of atomization microstructures 231 . The atomized microstructures 231 can be formed on the light-emitting surface 211 by, for example, sandblasting, screen printing, inkjet, etching, etc. Implementation aspect, but not limited to this. The haze layer 230 has a haze degree of less than 40%. Preferably, the fogging degree of the fogging layer 230 is between 5%-15%, so as to maintain the overall light-emitting brightness and picture clarity of the light-emitting surface 211 .

In this embodiment, each reflective microstructure 220 is recessed into the light guide body 210 from the bottom surface 212 . Each reflective microstructure 220 can be, for example, a triangular rod-shaped cavity, and has a light-receiving surface 221 facing the light-incident surface 213 and a backlight surface 222 away from the light-incident surface 213 . The backlight surface 222 and the bottom surface 212 form a first included angle θ1, and the light-receiving surface 221 and the bottom surface 212 form a second included angle θ2. The refractive index of the light guide plate 200 is greater than that of air, so the light beam L can be totally reflected between the light-emitting surface 211 and the bottom surface 212 for multiple times and then transmitted in a direction away from the light-incident surface 213 , and the reflective microstructure 220 can change the amount of light irradiated on the light-receiving surface 221 . The reflection direction of the light beam L, for example, the light-receiving surface 221 has an inclined angle (the second included angle θ2), so that the light beam L from the light-incident surface 213 irradiates the light-receiving surface 221 and is reflected toward the light-emitting surface 211, and can be emitted by the light-emitting surface 211. Preferably, the reflection of the light beam L by the light receiving surface 221 is total reflection, so as to avoid light leakage and increase light utilization. In addition, the edge of the light-receiving surface 221 of each reflective microstructure 220 on the bottom surface 212 forms a third included angle θ3 with the light-incident surface 213 . The third included angle θ3 can appropriately reflect the light beam L to travel in different directions, but it also needs to be within a range that allows the light-receiving surface 221 to totally reflect the light beam L, for example, the third included angle θ3 Mainly between 0 degrees and 35 degrees, when the material of the light guide plate 200 is acrylic (PMMA), the third included angle θ3 needs to be less than 42 degrees.

In this embodiment, the atomization layer 230 does not completely cover the light-emitting surface 211 , but covers a part of the light-emitting surface 211 , such as covering at least a part of the reflective microstructures 220 and other areas of the light-emitting surface 211 , but not limited to this . In other not-shown embodiments, the atomization layer 230 can also completely cover the light-emitting surface 211 , only cover at least a part of the plurality of reflective microstructures 220 , only completely cover all the reflective microstructures 220 , or only correspond to the reflective pattern according to requirements. set up.

In particular, when the light beam L is transmitted in the light guide body 210 , part of the light beam L is reflected by the reflective microstructure 220 and then exits toward the light-emitting surface 211 , and is then diffused by the atomizing layer 230 to exit the angular range of the light, so that the viewer can A continuous image (eg luminescence pattern) can be seen. The other part of the light beam L is totally reflected by the bottom surface 212 and then goes out to the light-emitting surface 211 , and is affected by the atomization layer 230 to be emitted from the light-emitting surface 211 . The included angle is large, so it will not be seen by viewers. Another part of the light beam L is reflected by the reflective microstructure 220 , but is emitted from the light emitting surface 211 without passing through the atomizing layer 230 . The light beam L emitted in this way can produce a shiny visual effect. Therefore, the display module 10 can set the pattern of the atomizing layer 230 according to different display effect requirements.

The light guide plate 200 of this embodiment may further include a plurality of light incident microstructures 250 disposed on the light incident surface 213 , such as a plurality of semicircular cylinders or dots, but not limited thereto. The light incident microstructure 250 can divide and scatter the light beam L toward the light incident surface 213 , so that the light beam L can be uniformly diffused in the light guide body 210 .

In this embodiment, the fogging layer 230 is disposed on the light-emitting surface 211 of the light guide plate 200 , so that the light-emitting angle of the light beam L with high directivity emitted from the light-emitting surface 211 can be increased, for example, the fogging layer 230 completely covers the light-emitting In embodiments in which the face 211 or only completely covers all of the reflective microstructures 220, a continuous display pattern can be seen no matter how the viewer moves.

2 is a schematic cross-sectional view of a light guide plate according to another embodiment of the present invention. Referring to FIG. 2 , the difference between this embodiment and the embodiment of FIG. 1B is that the atomized layer 230 a of the light guide plate 200 a of this embodiment is a coating layer with a plurality of diffusing particles 232 or a film layer attached to the light emitting surface 211 . When the light beam L exits from the light emitting surface 211 and enters the atomizing layer 230a, the diffusing particles 232 can scatter the light beam L to expand the light exit angle.

3A is a schematic cross-sectional view of a light guide plate according to another embodiment of the present invention. Referring to FIG. 3A , this embodiment is similar to the embodiment in FIG. 2 , except that the light guide plate 200 b of this embodiment further includes an auxiliary atomizing layer 240 a disposed on the light exit surface 211 , and the auxiliary atomizing layer 240 a can be disposed on the light exit surface 211 except the area where the atomized layer 230a is provided. The auxiliary atomization layer 240a may have an atomization degree different from that of the atomization layer 230a, for example, the auxiliary atomization layer 240a may have the diffusion particles 232 with a lower density than the atomization layer 230a, and thus have lower atomization than the atomization layer 230a Spend. The auxiliary fogging layer 240a disposed on the light emitting surface 211 has the function of diluting the outline of the fogging layer 230a, so as to optimize the display quality.

3B is a schematic cross-sectional view of a light guide plate according to another embodiment of the present invention. Please refer to FIG. 3B , this embodiment is similar to the embodiment of FIG. 1B and has the same function as the embodiment of FIG. 3A . The difference between the auxiliary atomization layer 240b of the light guide plate 200c of this embodiment and the auxiliary atomization layer 240a of FIG. 3A is that the auxiliary atomization layer 240b includes a plurality of atomization microstructures 241 . The size of the atomized microstructures 241 is different from that of the atomized microstructures 231 , so that the auxiliary atomization layer 240 b has a different atomization degree from that of the atomization layer 230 .

4 is a schematic cross-sectional view of a light guide plate according to yet another embodiment of the present invention. Referring to FIGS. 1A and 4 , the light guide plate 200d of this embodiment is substantially the same as the light guide plate 200a of FIG. 2 , the difference is that the atomized layer 230b of this embodiment is only disposed corresponding to the reflection pattern P1 formed by a plurality of reflection microstructures 220 arranged . Specifically, the pattern of the fogging layer 230b is the same as or slightly larger than the reflective pattern P1, and completely covers each reflective microstructure 220 in the orthographic projection direction, but it is not limited thereto. In other embodiments, the haze layer 230b may only cover at least a part of the plurality of reflective microstructures 220 . In another embodiment, the fogging layer 230b may include a plurality of fogging regions, each of which corresponds to each The reflective microstructures 220 are arranged, or each atomized area is arranged corresponding to at least a part of the plurality of reflective microstructures 220 .

FIG. 5A is a schematic diagram of the operation of a display module according to another embodiment of the present invention. Referring to FIG. 5A , the light guide plate 200e of the display module 10a1 of the present embodiment may have a plurality of regions that can emit light independently, such as a region R1 and a region R2. The regions R1 and R2 are respectively provided with reflective microstructures 220 . In FIG. 5 , one reflective microstructure 220 is shown in each region as a representative, but not limited thereto. The light source 100 includes a substrate 110 and a plurality of light-emitting elements, for example, a first light-emitting element 121 and a second light-emitting element 122 . The reflective microstructures 220 in the region R1 are used for reflecting the light beam L1 emitted by the first light emitting element 121 , and the reflective microstructures 220 in the region R2 are used for reflecting the light beam L2 emitted by the second light emitting element 122 . However, the present invention is not limited to this. In other implementations, the light beam L1 emitted by the first light-emitting element 121 may enter the regions R1 and R2, and the light beam L2 emitted by the second light-emitting element 122 may also be incident in the regions R1 and R2. R2. Since the reflective microstructure 220 corresponds to different light-emitting elements in this embodiment, it can control different light-emitting elements to emit light beams to achieve the effect of emitting light in different regions, and can be applied to backlight control of displays or to enhance the contrast of advertising light panels.

The light guide plate 200 of this embodiment is also provided with an atomized layer on the light-emitting surface, so that the light beams directed to any area, such as the light beam L1 entering the area R1, can be uniformly emitted in the area R1, and the light beam L2 entering the area R2 can be emitted uniformly in the area R1. The light is emitted uniformly in the area R2. It should be noted that the display module 10a of this embodiment can apply the fogging layer of any of the above-mentioned embodiments to achieve the effect of enabling viewers to see continuous images in each area.

FIG. 5B is a schematic diagram of a display module according to another embodiment of the present invention. Referring to FIG. 5B , the difference between the display module 10 b of this embodiment and FIG. 5A is that each light-emitting area of the light guide plate can overlap each other, for example, the area R3 is a large area, and the area R4 is a small area located in the area R3 area, and area R5 partially overlaps area R3. Similar to the display module 10a of FIG. 5A , the display module 10b of this embodiment can achieve the function of emitting light in different regions by controlling different light-emitting elements to emit light beams. effect so that the viewer sees a different image. In particular, in the present invention, the light source can be disposed on one side of the light guide plate 200, or can be disposed on two sides of the light guide plate 200, so that it is easier to control the direction of the light beam emitted by different light-emitting elements, and to design the reflection The orientation of the microstructures 220 .

In the present invention, an atomized layer is arranged on the light-emitting surface of the light guide plate, so that the light-emitting angle of the light beam with high directivity emitted from the light-emitting surface can be increased, so that the viewer can see a continuous display pattern.

However, the above are only preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, All still fall within the scope of the patent of the present invention. In addition, any embodiment of the present invention or the scope of the claims is not required to achieve all of the objects or advantages or features disclosed herein. In addition, the abstract section and the title are only used to aid the search of patent documents and are not intended to limit the scope of the present invention. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the elements or to distinguish different embodiments or scopes, and are not used to limit the number of elements. upper or lower limit.

10: Display module

100: light source

200: light guide plate

210: Light guide body

211: light-emitting surface

213: light incident surface

220: Reflective Microstructure

230: Atomization layer

250:Incoming Light Microstructure

L: Beam

P1: Reflective Pattern

θ3: the third angle

Claims (13)

A light guide plate comprises: a light guide body with a light emitting surface, a bottom surface opposite to the light emitting surface, and a light incident surface connected between the light emitting surface and the bottom surface; a plurality of reflective microstructures are arranged on the light emitting surface a bottom surface, wherein the reflective microstructures are arranged in a reflective pattern, and the reflective microstructures are suitable for reflecting a light beam from the light incident surface; and an atomization layer, disposed on the light exit surface, wherein the atomization layer is incomplete Covering the light emitting surface; wherein, a part of the light beam reflected by the reflective microstructures passes through the atomization layer, and another part of the light beam reflected by the reflective microstructures does not pass through the atomization layer. The light guide plate according to claim 1, wherein the atomized layer is a coating layer with a plurality of diffusing particles or a film layer attached to the light emitting surface. The light guide plate according to claim 1, wherein the atomized layer includes a plurality of atomized microstructures. The light guide plate according to claim 1, further comprising an auxiliary atomization layer disposed on the light emitting surface, wherein the atomization layer and the auxiliary atomization layer have different degrees of atomization. The light guide plate of claim 1, wherein the atomized layer covers at least a part of the reflective microstructures. The light guide plate according to claim 1, wherein the atomized layer is only provided corresponding to the reflection pattern. The light guide plate according to claim 1, wherein the fogging layer has a fogging degree, wherein the fogging degree is less than 40%. The light guide plate according to claim 7, wherein the degree of haze is between 5% and 15%. The light guide plate of claim 1, wherein each of the reflective microstructures is recessed into the light guide body from the bottom surface. The light guide plate according to claim 1, further comprising a plurality of light incident microstructures disposed on the light incident surface. A display module, comprising: a light guide plate, including: a light guide body, having a light emitting surface, a bottom surface opposite to the light emitting surface, and a light incident surface connected between the light emitting surface and the bottom surface; a plurality of a reflective microstructure arranged on the bottom surface, wherein the reflective microstructures are arranged in a reflective pattern, and the reflective microstructures are suitable for reflecting a light beam from the light incident surface; and an atomization layer is arranged on the light emitting surface, Wherein the atomized layer does not completely cover the light-emitting surface; and a light source, disposed relative to the light-incident surface, for providing the light beam; wherein, a part of the light beam reflected by the reflective microstructures passes through the atomized layer , another part of the light beam reflected by the reflective microstructures does not pass through the atomized layer. The display module of claim 11, wherein the light source includes a first light-emitting element and a second light-emitting element, wherein a part of the reflective microstructures is used to reflect the light beam emitted by the first light-emitting element, and the The other part of the reflective microstructure is used to reflect the light beam emitted by the second light-emitting element. The display module of claim 11, wherein the display module is a transparent display.

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