TW202111257A - 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 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 light is transmitted through 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, because the microstructure is a rod-shaped 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 direction of travel (for example, the normal direction of the light-emitting surface of the light guide plate). ), and the horizontal traveling direction (for example, the normal direction of the light incident surface of the light guide plate) does not change. A light source directed at multiple microstructures will generate light beams with different horizontal angles depending on the position of the microstructures. Therefore, viewers can only observe the microstructures in a specific area at a fixed position reflecting the light beam of a light source. . Even if the luminous lighting panel is equipped with multiple light sources, these light sources are arranged at an interval, so that the viewer will only see part of the light beam reflected by the microstructure at the same position, so that the original light-emitting display pattern becomes Discontinuous light-emitting display pattern with interlaced bright and dark lines. Furthermore, because the microstructure uses total reflection to reflect the light beam, the angle of the vertical travel direction of the reflected light beam is further limited. When the viewer moves the position, the light-emitting pattern cannot be clearly seen.

This "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the contents disclosed in the "prior art" may include some conventional technologies that do not constitute those of ordinary knowledge in the technical field. In addition, the content disclosed in the "prior art" does not represent the content or the problem to be solved by one or more embodiments of the present invention, nor does it represent that the present invention has been used by a person with ordinary knowledge in the technical field before the application of the present invention. Know or recognize.

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

The other objectives 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 objectives or other objectives, the light guide plate provided by the present invention includes a light guide body, a plurality of reflective microstructures, and an atomization 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, suitable for reflecting the light beam from the light-incident surface, and the fogging layer is arranged on the light-emitting surface.

In order to achieve one or part or all of the above objectives or other objectives, the display module provided by the present invention includes a light source and the above light guide plate. The light source is arranged opposite 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 diffusion particles or a film layer attached to the light-emitting surface.

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

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

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

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

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

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

In an embodiment of the present invention, the degree of atomization 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 of an embodiment of the present invention may further include a plurality of light incident microstructures arranged 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 to reflect the light beam emitted by the first light-emitting element, and the other part is used to reflect 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 provided on the light exit surface of the light guide plate, so that the light exit angle of the highly directional light beam emitted from the light exit surface can be increased, so that the viewer can see the continuity regardless of movement. The display pattern.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are described in detail below in conjunction with the accompanying drawings.

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, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

FIG. 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. 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-emitting surface 211, a bottom surface 212 opposite to the light-emitting surface 211, and a light-incident surface 213 connected between the light-emitting surface 211 and the bottom surface 212, and the light-incident surface 213 is used for receiving the light beam L. The reflective microstructure 220 is disposed on the bottom surface 212 and arranged in a reflective pattern P1, and the reflective microstructure 220 is adapted to reflect the light beam L from the light incident surface 213, and the atomization 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, the reflection pattern P1 in FIG. 1A is shown as a rectangle, but the present invention is not limited to this. In other embodiments, the reflection pattern P1 may be a geometric pattern, a text, an image of a doll, or various patterns. The viewer can see the corresponding geometric patterns, text, 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 pattern, the display module 10 can be nearly transparent and the background pattern can be seen, but the present invention is not limited to this. In other embodiments, the display module 10 can be a transparent display without a background pattern, which means that the scene on the other side of the display module 10 relative to the viewer can be used as the background, and it can also be selectively displayed when the light-emitting pattern is displayed. When the display module 10 does not display the light pattern, the display module 10 can be nearly transparent, so that the viewer can see the scenery behind the display module 10 completely. .

In this embodiment, the atomized layer 230 includes a plurality of atomized microstructures 231. The atomized microstructures 231 can be formed on the light-emitting surface 211 by methods such as sandblasting, screen printing, inkjet, etching, etc. The atomized microstructures 231 can be triangular cones, round convex dots, round concave dots, irregular structures, etc. Implementation status, but not limited to this. The fogging layer 230 has a fogging degree of less than 40%. Preferably, the fogging degree of the fogging layer 230 is between 5% and 15%, so as to maintain the overall brightness of the light-emitting surface 211 and image clarity.

In this embodiment, each reflective microstructure 220 is recessed into the light guide body 210 from the bottom surface 212. Each reflective microstructure 220 may, for example, be a triangular rod-shaped cavity, and have 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 angle θ1, and the light receiving surface 221 and the bottom surface 212 form a second 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 exit surface 211 and the bottom surface 212 and be transmitted away from the light entrance surface 213. The reflective microstructure 220 can change the amount of light irradiated to the light receiving surface 221. The reflection direction of the light beam L, for example, the light receiving surface 221 has an inclination 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 reflects toward the light exit surface 211, and can emit light from the light exit surface 211. Preferably, the reflection of the light beam L by the light receiving surface 221 is total reflection 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 and the light-incident surface 213 form a third angle θ3. The third included angle θ3 can appropriately reflect the light beam L to a different direction, but it also needs to be in a range that allows the light receiving surface 221 to totally reflect the light L. For example, the third included angle θ3 is 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 fogging 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 microstructure 220 and other areas of the light-emitting surface 211, but it is not limited to this. . In other non-illustrated embodiments, the fogging 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, depending on requirements. Set up.

In particular, when the light beam L is transmitted in the light guide body 210, a part of the light beam L is reflected by the reflective microstructure 220 and then exits toward the light exit surface 211, and then is diffused by the atomized layer 230 to the angle range of the light, so that the viewer A continuous image (e.g. light pattern) can be seen. The other part of the light beam L is totally reflected by the bottom surface 212 and then directed toward the light-emitting surface 211, and is affected by the fogging layer 230 to emit light from the light-emitting surface 211. However, the light beam L emitted in this way is usually equal to the normal line F of the light-emitting surface 211. The included angle is large, so it will not be seen by viewers. Yet 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 fogging layer 230. The light beam L emitted in this way can produce a shining visual effect. Therefore, the display module 10 can be configured with the pattern of the fogging 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 provided on the light incident surface 213, such as a plurality of semicircular cylinders or dots, but it is not limited thereto. The light incident microstructure 250 can separately 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 provided on the light-emitting surface 211 of the light guide plate 200, so 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. In the embodiment where the surface 211 or only completely covers all the reflective microstructures 220, the viewer can see the continuous display pattern no matter what the movement.

2 is a schematic cross-sectional view of a light guide plate according to another embodiment of the invention. Please refer to FIG. 2, the difference between this embodiment and the embodiment in FIG. 1B is that the atomization layer 230 a of the light guide plate 200 a of this embodiment is a coating layer with a plurality of diffusion particles 232 or a film layer attached to the light emitting surface 211. When the light beam L exits from the light exit surface 211 and enters the atomization layer 230a, the diffusion 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 invention. 3A, this embodiment is similar to the embodiment in FIG. 2, the difference is that the light guide plate 200b of this embodiment further includes an auxiliary atomization layer 240a disposed on the light-emitting surface 211, and the auxiliary atomization layer 240a can be disposed on the light-emitting surface 211 Except for the area where the atomized layer 230a is provided. The auxiliary atomization layer 240a may have a degree of atomization that is different from that of the atomization layer 230a. For example, the auxiliary atomization layer 240a may have a density of diffusion particles 232 lower than that of the atomization layer 230a, thereby having a lower degree of atomization than the atomization layer 230a. degree. The auxiliary fogging layer 240a disposed on the light emitting surface 211 has the function of lightening the contour of the fogging layer 230a to optimize the display quality.

3B is a schematic cross-sectional view of a light guide plate according to another embodiment of the invention. Please refer to FIG. 3B. This embodiment is similar to the embodiment in FIG. 1B and has the same function as the embodiment in 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 microstructure 241 is different from that of the atomized microstructure 231, so that the auxiliary atomization layer 240b has a different degree of atomization from the atomization layer 230.

4 is a schematic cross-sectional view of a light guide plate according to still another embodiment of the present invention. 1A and FIG. 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 atomization layer 230b of this embodiment only corresponds to the reflective pattern P1 in which a plurality of reflective microstructures 220 are 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 to this. In other embodiments, the atomized layer 230b can also only cover at least a part of the plurality of reflective microstructures 220. In another embodiment, the atomization layer 230b may include a plurality of atomization areas, and each atomization area is arranged corresponding to each reflective microstructure 220, or each atomization 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 the display module according to another embodiment of the present invention. Referring to FIG. 5A, the light guide plate 200e of the display module 10a of this embodiment may have a plurality of independently emitting regions, 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 it is not limited thereto. The light source 100 includes a substrate 110 and a plurality of light-emitting elements, such as a first light-emitting element 121 and a second light-emitting element 122. The reflective microstructure 220 in the region R1 is used to reflect the light beam L1 emitted by the first light-emitting element 121, and the reflective microstructure 220 in the region R2 is used to reflect 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 can enter the region R1 and the region R2, and the light beam L2 emitted by the second light-emitting element 122 can also enter the region R1 and the region. R2. In this embodiment, because the reflective microstructure 220 corresponds to different light-emitting elements, it is possible to control the different light-emitting elements to emit light beams to achieve the effect of partitioned light emission, which can be applied to the backlight control of the display or to enhance the contrast of the advertising light board.

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

FIG. 5B is a schematic diagram of a display module according to another embodiment of the invention. Referring to FIG. 5B, the difference between the display module 10b 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. , And the region R5 partially overlaps the region R3. Similar to the display module 10a of FIG. 5A, the display module 10b of this embodiment can achieve the effect of partitioned light emission by controlling different light-emitting elements to emit light beams, so that the viewer can see different images. In particular, in the present invention, the light source can be arranged on one side of the light guide plate 200, or on both 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 design the reflection. The arrangement direction of the microstructure 220.

The present invention is provided with an atomization layer on the light exit surface of the light guide plate, so that the light exit angle of the light beam with high directivity emitted from the light exit surface can be increased, so that the viewer can see the continuous display pattern.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of the patent application does not have to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract part and title are only used to assist in searching for patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element (element) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. Upper or lower limit.

10, 10a, 10b: display module 100: light source 110: substrate 121: The first light-emitting element 122: second light-emitting element 200, 200a, 200b, 200c, 200d, 200e: light guide plate 210: Light guide body 211: Glossy Surface 212: Bottom 213: Glossy Surface 220: reflective microstructure 221: light-receiving surface 222: Backlight 230, 230a, 230b: diffusion layer 231, 241: Diffusion microstructure 232: Diffusion Particles 240a, 240b: auxiliary diffusion layer 250: light incident microstructure F: Normal L, L1, L2: beam P1: reflection pattern R1, R2, R3, R4, R5: area θ1: The first included angle θ2: second included angle θ3: The third included angle

FIG. 1A is a schematic top view of a display module according to an embodiment of the invention. Fig. 1B is a schematic cross-sectional view taken along the line A-A of Fig. 1A. 2 is a schematic cross-sectional view of a light guide plate according to another embodiment of the invention. 3A is a schematic cross-sectional view of a light guide plate according to still another embodiment of the present invention. 3B is a schematic cross-sectional view of a light guide plate according to still another embodiment of the present invention. 4 is a schematic cross-sectional view of a light guide plate according to still another embodiment of the present invention. FIG. 5A is a schematic diagram of the operation of the 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 invention.

10: Display module

100: light source

200: light guide plate

210: Light guide body

211: Glossy Surface

213: Glossy Surface

220: reflective microstructure

230: diffusion layer

250: light incident microstructure

L: beam

P1: reflection pattern

θ3: The third included angle

Claims (14)

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 reflective microstructures are 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 atomized layer is arranged on the light-emitting surface. The light guide plate according to claim 1, wherein the atomization layer is a coating layer with a plurality of diffusion 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 exit surface, wherein the atomization layer and the auxiliary atomization layer have different degrees of atomization. The light guide plate according to claim 1, wherein the atomized layer covers a part of the light emitting surface. The light guide plate according to claim 5, 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 provided only corresponding to the reflective 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 8, wherein the degree of fog is between 5% and 15%. The light guide plate according to 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 arranged on the light incident surface. A display module includes: 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 reflective microstructures are 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 atomized layer is arranged on the light emitting surface; and A light source is arranged relative to the light incident surface for providing the light beam. The display module according to claim 12, 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 according to claim 12, wherein the display module is a transparent display.

Images