阅读说明：本技术 导光板组件、前置光源和反射式显示装置 (Light guide plate assembly, front light source and reflective display device ) 是由 梁菲 陈秀云 孙凌宇 杜景军 方立宇 侯婷琇 钟鹏 于 2019-03-13 设计创作，主要内容包括：本发明提供一种导光板组件,包括导光板,所述导光板包括：相对面的第一表面和第二表面、以及连接在所述第一表面与所述第二表面之间的第一侧面,所述第一表面上设置有多个微结构,所述微结构用于将从所述导光板射入所述微结构的光向远离导光板的方向射出；其中,微结构包括相对的顶面和底面、以及连接在顶面和底面之间的侧面,顶面朝向导光板,顶面在第一表面上的正投影位于底面在第一表面上的正投影范围内；微结构的垂直于第一侧面的纵截面包括：底边、顶边和侧边,顶边位于微结构的顶面上,底边位于底面上,侧边位于侧面上；侧边的至少一部分呈外凸的弧形。本发明还提供一种前置光源和一种反射式显示装置。本发明能够改善显示装置的显示效果。(The present invention provides a light guide plate assembly including a light guide plate, the light guide plate including: the light guide plate comprises a first surface, a second surface and a first side surface, wherein the first surface and the second surface are opposite, the first side surface is connected between the first surface and the second surface, the first surface is provided with a plurality of microstructures, and the microstructures are used for emitting light which enters the microstructures from the light guide plate to a direction far away from the light guide plate; the microstructure comprises a top surface, a bottom surface and a side surface, wherein the top surface is opposite to the bottom surface, the side surface is connected between the top surface and the bottom surface, the top surface faces the light guide plate, and the orthographic projection of the top surface on the first surface is positioned in the orthographic projection range of the bottom surface on the first surface; a longitudinal section of the microstructure perpendicular to the first side comprises: a top edge on the top surface of the microstructure, a bottom edge on the bottom surface, and a side edge on the side surface; at least a portion of the side edges are convexly curved. The invention also provides a front light source and a reflective display device. The invention can improve the display effect of the display device.)

1. A light guide plate assembly comprising a light guide plate, the light guide plate comprising: the light guide plate comprises a first surface, a second surface and a first side surface, wherein the first surface and the second surface are opposite, the first side surface is connected between the first surface and the second surface, and the light guide plate is characterized in that a plurality of microstructures are arranged on the first surface and used for emitting light which enters the microstructures from the light guide plate to a direction far away from the light guide plate; wherein the microstructure comprises a top surface and a bottom surface which are opposite to each other, and a side surface connected between the top surface and the bottom surface, the top surface faces the light guide plate, and the orthographic projection of the top surface on the first surface is within the orthographic projection range of the bottom surface on the first surface;

a longitudinal cross-section of the microstructure perpendicular to the first side comprises: a bottom edge, a top edge, and a side edge, the top edge being located on a top surface of the microstructure, the bottom edge being located on a bottom surface of the microstructure, and the side edge being located on a side surface of the microstructure; at least a portion of the side edges are convexly curved.

2. The light guide plate assembly of claim 1, wherein the top surfaces of the microstructures are attached to the first surface of the light guide plate.

3. The light guide plate assembly of claim 1, wherein the top surface of the microstructure is an inner concave surface, the inner concave surface is fixedly connected to the first surface by an adhesive, and the entire inner concave surface is covered by the adhesive.

4. The light guide plate assembly of claim 3, wherein the top surface of the microstructures are arcuate.

5. The light guide plate assembly as claimed in claim 1, wherein the entire side edge is convex and has a vertical distance from any point on the side edge to the first surface smaller than a vertical distance from a center of the side edge to the first surface.

6. The light guide plate assembly of claim 5, wherein an included angle between a tangent line at an intersection of the side edge and the bottom edge is between 83 ° and 84 °; the radius of the side edge is between 19 and 20 mu m; the height of the microstructure is between 11 and 12 mu m.

7. The light guide plate assembly as claimed in claim 1, wherein the side edge comprises a plurality of sub-side edges connected in sequence, each sub-side edge is in a convex arc shape, and different sub-side edges correspond to different circle centers; the vertical distance from any point on the sub-side to the first surface is smaller than the vertical distance from the circle center corresponding to the sub-side to the first surface.

8. The light guide plate assembly according to claim 1, wherein the microstructures are bar-shaped, a plurality of the microstructures are arranged in a direction gradually away from the first side surface, and an extending direction of each of the microstructures intersects with an arrangement direction of the plurality of the microstructures.

9. The light guide plate assembly of claim 1, wherein the sides of the microstructures are: the convex arc line rotates around a rotating shaft vertical to the first surface to form a curved surface, and the plurality of microstructures are arranged in an array.

10. The light guide plate assembly of any one of claims 1-9, wherein the microstructures have a distribution density that gradually increases in a direction gradually away from the first side surface.

11. The light guide plate assembly of any one of claims 1-9, further comprising a base plate on a side of the microstructures facing away from the light guide plate, the microstructures being fixedly attached to the base plate.

12. A front-facing light source, comprising: a light emitting member and the light guide plate assembly of any one of claims 1 to 11, the light emitting member being disposed at the first side of the light guide plate.

13. A reflective display device, comprising: a reflective display panel and the front-light of claim 12, the front-light being disposed outside a display surface of the reflective display panel, the microstructures facing the reflective display panel.

Technical Field

The invention relates to the technical field of display, in particular to a light guide plate assembly, a front light source and a reflective display device.

Background

The total reflection display technology has obvious effects on reducing power consumption and improving standby time, but the problem of poor display effect occurs when ambient light is weak. In order to solve the problem, a front light source is usually added on the display surface of the total reflection display panel, and when the ambient light is weak, the purpose of improving the display effect is achieved by starting the front light source. The prior front-end light source provides more stray light for the reflective display panel, which results in poor display effect.

Disclosure of Invention

The invention aims to solve at least one technical problem in the prior art, and provides a light guide plate assembly, a front light source and a reflective display device.

In order to achieve the above object, the present invention provides a light guide plate assembly including a light guide plate including: the light guide plate comprises a first surface, a second surface and a first side surface, wherein the first surface and the second surface are opposite, the first side surface is connected between the first surface and the second surface, the first surface is provided with a plurality of microstructures, and the microstructures are used for emitting light which enters the microstructures from the light guide plate to a direction far away from the light guide plate; wherein the microstructure comprises a top surface and a bottom surface which are opposite to each other, and a side surface connected between the top surface and the bottom surface, the top surface faces the light guide plate, and the orthographic projection of the top surface on the first surface is within the orthographic projection range of the bottom surface on the first surface;

a longitudinal cross-section of the microstructure perpendicular to the first side comprises: a bottom edge, a top edge, and a side edge, the top edge being located on a top surface of the microstructure, the bottom edge being located on a bottom surface of the microstructure, and the side edge being located on a side surface of the microstructure; at least a portion of the side edges are convexly curved.

Optionally, the top surface of the microstructure is attached to the first surface of the light guide plate.

Optionally, the top surface of the microstructure is an inner concave surface, the inner concave surface is fixedly connected with the first surface through an adhesive, and the whole inner concave surface is covered by the adhesive.

Optionally, the top surface of the microstructure is cambered.

Optionally, the entire side edge is in a convex arc shape, and a vertical distance from any point on the side edge to the first surface is smaller than a vertical distance from a circle center corresponding to the side edge to the first surface.

Optionally, an included angle between a tangent line at the intersection of the side edge and the bottom edge is between 83 ° and 84 °; the radius of the side edge is between 19 and 20 mu m; the height of the microstructure is between 11 and 12 mu m.

Optionally, the side edge comprises a plurality of sub side edges connected in sequence, each sub side edge is in a convex arc shape, and different sub side edges correspond to different circle centers; the vertical distance from any point on the sub-side to the first surface is smaller than the vertical distance from the circle center corresponding to the sub-side to the first surface.

Optionally, the microstructures are strip-shaped, the microstructures are arranged along a direction gradually away from the first side surface, and an extending direction of each microstructure intersects with an arrangement direction of the microstructures.

Optionally, the side of the microstructure is: the convex arc line rotates around a rotating shaft vertical to the first surface to form a curved surface, and the plurality of microstructures are arranged in an array.

Optionally, the distribution density of the microstructures is gradually increased along a direction gradually away from the first side surface.

Optionally, the light guide plate assembly further includes a substrate, the substrate is located on a side of the microstructure away from the light guide plate, and the microstructure is fixedly connected to the substrate.

Correspondingly, the invention also provides a front light source, which comprises: the light guide plate assembly comprises a light emitting piece and the light guide plate assembly, wherein the light emitting piece is arranged on a first side face of the light guide plate.

Accordingly, the present invention also provides a reflective display device comprising: the front light source is arranged outside the display surface of the reflective display panel, and the microstructure faces the reflective display panel.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a cross-sectional view of a light guide plate assembly according to an embodiment of the present invention;

FIGS. 2a and 2b are schematic diagrams of light adjustment by microstructures of different shapes, respectively;

FIG. 3a is a schematic perspective view of a substrate and a microstructure disposed thereon;

FIG. 3b is a second schematic perspective view of a substrate and a microstructure disposed thereon;

FIG. 4a is a schematic diagram illustrating the bonding effect when the top surface of the microstructure is concave;

FIG. 4b is a schematic diagram illustrating the bonding effect when the top surface of the microstructure 12 is a plane;

FIGS. 5a and 5b are schematic longitudinal cross-sectional views of two microstructures, respectively;

fig. 6 is a cross-sectional view of a reflective display device according to a third embodiment of the present invention;

FIG. 7a is a schematic diagram illustrating a relationship between light intensity and light angle of emergent light of the reflective display device when the microstructure shown in FIG. 2a is adopted;

FIG. 7b is a schematic diagram illustrating a relationship between light intensity and light angle of emergent light of the reflective display device when the microstructure shown in FIG. 2b is adopted.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Fig. 1 is a cross-sectional view of a light guide plate assembly according to an embodiment of the present invention. As shown in fig. 1, the light guide plate assembly 10 includes a light guide plate 11 and a plurality of microstructures 12. The light guide plate 11 includes opposite first and second surfaces S11 and S12, and a first side surface S13 connected between the first and second surfaces S11 and S12. Fig. 1 is a longitudinal section perpendicular to the first side.

The microstructures 12 are disposed on the first surface S11, and are used for emitting light entering the microstructures 12 from the light guide plate 11 to a direction away from the light guide plate 11. Wherein the microstructures 12 include opposing top and bottom surfaces, and a side surface connecting between the top and bottom surfaces, the top surface of the microstructures 12 facing the light guide plate 11. The orthographic projection of the top surface of the microstructure 12 on the first surface S11 of the light guide plate 11 is located within the orthographic projection range of the bottom surface on the first surface S11, that is, the microstructure 12 is a structure with a small top and a big bottom. At least a part of the side surface of the microstructure 12 is a convex curved surface, and a longitudinal section of the microstructure 12 perpendicular to the first side surface includes: the microstructure comprises opposing bottom and top edges, the top edge being located on a top surface of the microstructure, the bottom edge being located on a bottom surface of the microstructure, and side edges connected between the bottom and top edges, the side edges being located on side surfaces of the microstructure. The microstructures 12 are used to make the included angle between the direction of light emitted from the bottom of the microstructures 12 and the thickness direction of the light guide plate 11 not exceed 30 ° after light enters the microstructures 12 from the light guide plate 11.

It should be noted that the convex curved surface means: with the top and bottom surface boundaries of the microstructure 12 defining a natural transition surface, the remaining portion of the convexly curved surface, excluding the top and bottom boundaries, is located outside the natural transition surface. Specifically, the convex curved surface may be: a curved surface obtained by moving the convex arc line in a direction perpendicular to the plane on which the convex arc line is located, or a curved surface obtained by rotating the convex arc line around a rotating shaft perpendicular to the first surface S11.

Fig. 2a and 2b are schematic diagrams of light adjustment by microstructures of different shapes, respectively, in which the side of the longitudinal section of the microstructure 12 in fig. 2a is arc-shaped, and the side of the longitudinal section of the microstructure 12 in fig. 2b is linear. As shown in fig. 2a and 2b, when the cross section of the microstructure 12 is as shown in fig. 2b, the light emitted through the microstructure 12 is more divergent; when the cross section of the microstructure 12 is as shown in fig. 2a, the light emitted through the microstructure 12 is more gathered.

The light guide plate assembly 10 of the present embodiment can be used in a reflective display device, and generally, light rays with an incident angle within 30 ° can be reflected by a reflective layer of a reflective display panel to a viewer, while large-angle incident light rays are totally reflected in the reflective display panel and cannot enter human eyes. In this embodiment, at least a portion of the side surface of the microstructure 12 is a convex curved surface, so that the included angle between the direction of the light exiting the microstructure 12 and the thickness direction of the light guide plate 11 is not more than 30 °, and therefore, more light can be reflected to an observer by the reflective layer of the reflective display panel, thereby improving the light utilization rate and improving the display effect.

The top surface of the microstructure 12 may be a flat surface or an inner concave surface, and when the top surface is a flat surface, it may be attached to the first surface S11 of the light guide plate 11. Here, "attaching" means: the top surfaces of the microstructures 12 are attached to the first surface S11 of the light guide plate 11 in parallel, specifically, the microstructures 12 may be integrally formed with the light guide plate 11, or the top surfaces of the microstructures 12 are attached to the first surface S11 by an adhesive. When the top surface of the microstructure 12 is concave, the top surface is connected to the first surface S11 by an adhesive.

The light guide plate assembly 10 of the present invention will be described in detail with reference to the accompanying drawings.

In some embodiments, as shown in fig. 1, the light guide plate assembly 10 further includes a substrate 13, the substrate 13 is located on a side of the microstructures 12 facing away from the light guide plate 11, and the microstructures 12 are fixedly connected to the substrate 13. The substrate 13 may serve as a carrier for the microstructures 12. In an actual production process, the microstructures 12 may be fabricated on the substrate 13, and then the microstructures 12 are bonded to the light guide plate 11 by the adhesive layer 14.

The light guide plate 11 may be made of Polycarbonate (PC) or polymethyl methacrylate (PMMA); the microstructures 12 may be made of UV glue or other adhesive light-transmitting material; the substrate 13 may be made of PET, PC, PMMA, or the like. The refractive indices of the light guide plate 11, the microstructures 12, the substrate 13, and the adhesive should be as close as possible.

FIG. 3a is a schematic perspective view of a substrate and a microstructure disposed thereon; fig. 3b is a second schematic perspective view of the substrate and the microstructure disposed on the substrate. As shown in fig. 3a, the microstructures 12 may be in the shape of stripes, and the plurality of microstructures 12 are arranged along a direction gradually away from the first side surface, and the extending direction of each microstructure 12 intersects with the arrangement direction of the plurality of microstructures 12. In particular, the direction of extension of each microstructure 12 may be parallel to the first side. Alternatively, as shown in fig. 3b, the side of the microstructure 12 is: the convex arc line is a curved surface obtained by rotating around a rotating shaft perpendicular to the first surface S11, the orthographic projection of the microstructure 12 on the first surface of the light guide plate 11 is circular, and the plurality of microstructures 12 are arranged in an array.

Of course, the orthographic projection of the microstructure 12 on the first surface of the light guide plate 11 may also be in other shapes such as an ellipse and a rectangle.

When the light guide plate assembly 10 is used in a display device, the first side surface S13 is provided with a light emitting element, so that light in the light guide plate 11 is gradually attenuated in a direction away from the first side surface S13, and in order to ensure uniformity of light emitted from the microstructures 12 to the reflective display panel, the distribution density of the microstructures 12 is gradually increased in a direction away from the first side surface S13. That is, the spacing between adjacent microstructures 12 gradually decreases in a direction gradually away from the first side S13.

In some embodiments, as shown in fig. 1, 3a and 3b, the top surface of the microstructure 12 is an inner concave surface, the inner concave surface is fixedly connected to the first surface S11 of the light guide plate 11 by an adhesive, and the entire inner concave surface is covered by the adhesive.

Fig. 4a is a schematic diagram of the bonding effect when the top surface of the microstructure is concave, and fig. 4b is a schematic diagram of the bonding effect when the top surface of the microstructure 12 is flat. As shown in fig. 4a and 4b, when the top surface of the microstructure 12 is a plane, the area of the bonding surface between the microstructure 12 and the light guide plate 11 is small, which is likely to cause poor bonding; the application pressure needs to be increased to ensure the application effect, but this may cause glue overflow, resulting in unevenness of the adhesive layer 14, as shown in fig. 4 b; thus, when the light in the light guide plate 11 is emitted to the display panel from the flash, stray light is generated, and the display effect is reduced. When the top surface of the microstructure 12 is concave, the bonding area can be increased, so that the bonding firmness is increased; and when the bonding is carried out, as shown in fig. 4a, the adhesive can enter the concave part, so that the adhesive overflowing risk is reduced, and the display effect is optimized.

Fig. 5a and 5b are schematic longitudinal cross-sections of two microstructures, respectively, the longitudinal cross-section being a longitudinal cross-section perpendicular to the first side. As shown in fig. 5a and 5b, a longitudinal section of the microstructure 12 perpendicular to the first side surface is trapezoid-like, and includes: the bottom edge BL and the top edge TL are opposite, and two side edges SL are connected between the bottom edge BL and the top edge TL; at least a portion of the side SL is convexly curved.

In some embodiments, the top surface of the microstructure 12 is cambered. That is, the top edge TL of the microstructure 12 in a longitudinal section perpendicular to the first side surface is arc-shaped (as shown in fig. 5a and 5 b), but the top surface of the microstructure 12 may also be a surface formed by connecting a plurality of planes (in this case, the top edge TL is zigzag-shaped), or other shapes.

In some embodiments, as shown in fig. 5a, the entire side SL is convex, and the vertical distance from any point on the side SL to the first surface S11 is less than the vertical distance from the center of the circle corresponding to the side SL to the first surface S11. That is, the direction from any point on the side SL to the corresponding center of the circle is inclined downward, so that the light is reflected by the side surface and then emitted to the bottom surface.

In some embodiments, as shown in fig. 5b, the side SL includes a plurality of sub-sides SSL, each sub-side SSL is in an arc shape protruding outward, and different sub-sides SSL correspond to different circle centers. The vertical distance from any point on the sub-side SSL to the first surface S11 is smaller than the vertical distance from the center of the circle corresponding to the sub-side SSL to the first surface S11, that is, the direction from any point on the sub-side SSL to the corresponding center of the circle is inclined downward, so that the light is reflected by the side surface and then emitted to the bottom surface. Compared with the structure of fig. 5a, when the shape of fig. 5b is adopted, the microstructures 12 can further gather light, so that the included angle between the direction of the incident light from the bottom surface of the microstructures 12 and the thickness direction of the light guide plate 11 is as small as possible after the incident light at each angle passes through the microstructures 12.

In practical application, the radius and the angle of the arc-shaped edge can be set according to specific requirements.

In one embodiment, the entire side SL is in a convex arc shape, a tangent line at an intersection point of the side and the bottom side is a first tangent line, and an included angle γ between the first tangent line and the bottom side is between 83 ° and 84 °; the radius of the arc side is between 19 and 20 mu m; the height of the microstructures 12 is between 11 μm and 12 μm. More specifically, the included angle γ between the first tangent line and the base line BL is 83.72 °; the radius of the side SL is 19.04 μm; the height of the microstructures 12 was 11.4 μm; the width a of the top edge TL is 7 mu m; the width b of the bottom side BL is 18 μm; the top surface of the microstructure 12 was recessed to a depth of 2 μm.

Referring to fig. 6, the front light according to the second embodiment of the present invention includes a light emitting member 20 and the light guide plate assembly 10 according to the first embodiment, wherein the light emitting member 20 is disposed on a first side surface of the light guide plate 11 and emits light toward the first side surface.

A third embodiment of the invention provides a reflective display device, as shown in fig. 6, including a reflective display panel 30 and the front light source of the second embodiment, the front light source is disposed outside the display surface of the reflective display panel 30, and the first surface of the light guide plate 11 faces the reflective display panel 30.

The reflective display device can be a reflective liquid crystal display module, an electronic paper display device, a display, or a product or a component with a display function.

In one embodiment, microstructure 12 is the structure shown in FIG. 2a, wherein the entire side SL of the longitudinal section is in the shape of a convex arc, the included angle γ between the tangent line at the intersection of the side SL and the bottom BL and the bottom is 83.72 °, the radius of the side SL is 19.04 μm, and the height of microstructure 12 is 11.4 μm. At this time, the relationship between the light intensity and the light angle of the emergent light of the reflective display device is shown in fig. 7 a. The ray angles here are: the angle between the exit direction of the light from the bottom surface of the microstructure and the thickness direction of the reflective display device is negative when the light of the light emitting member exits toward the upper left of fig. 6, and positive when the light of the light emitting member exits toward the upper right of fig. 6. The angular range of the light with a light intensity above half the maximum light intensity is taken as the angular range of the light intensity of the display device. In fig. 7a, the light intensity angle of the reflective display device ranges from-9 to 11.

When the microstructure 12 employs the structure shown in fig. 2b, the angle between the side and the bottom of the longitudinal section of the microstructure 12 is set to 55 °, and the height of the microstructure 12 is set to 11.4 μm. At this time, the relationship between the light intensity and the light angle of the emergent light of the reflective display device is shown in fig. 7 b. In fig. 7b, the light intensity angle of the reflective display device ranges from-25 ° to 25 ° (i.e., the angle between the light exit direction and the thickness direction of the reflective display device does not exceed 25 °). As can be seen from fig. 7a and 7b, when the side of the longitudinal section of the microstructure 12 is arc-shaped, the emergent light of the reflective display device is more concentrated, and the maximum value of the light intensity is further increased.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.