Light guide plate and display device

Abstract

This invention proposes a light guide plate comprising: a first surface and a first side surface connected together, the first surface having a first region and a second region. A first microstructure is disposed in the first region, and a second microstructure is located in the second region, having a shape different from the first microstructure. The first microstructure has a vertex and a triangular base, the triangular base having an axis of symmetry, an edge, and a tip. The angle between the axis of symmetry and the microstructure normal to the first side surface of the light guide plate is less than or equal to 20 degrees. The ratio of the height to the length of the first microstructure is between 0.08 and 0.3. The first microstructure includes a reflective microstructure and a beam-splitting microstructure. The tip of the reflective microstructure is located between the first side surface and the edge, and the edge of the beam-splitting microstructure is located between the first side surface and the tip. This invention also provides a display device with a light guide plate. The light guide plate and display device of this invention can improve the problem of bright and dark areas on the light-incident side.

Claims

1. A light guide plate, comprising: First side view; A first surface, connected to the first side surface, and the first surface having a first region and a second region, the first region being located between the first side surface and the second region; a plurality of first microstructures disposed in the first region, wherein each of the first microstructures has a vertex and a triangular base, the triangular base being located on the first surface and having an axis of symmetry, an edge, and a tip, the edge and the tip being opposite each other, the axis of symmetry being perpendicular to the edge and passing through the tip, and the axis of symmetry having a microstructure angle with a normal of the first side surface, the microstructure angle being greater than or equal to 0 degrees and less than or equal to 20 degrees, each of the first microstructures having a height between the vertex and the first surface, and each of the triangular bases having a length between the edge and the tip, the ratio of the height to the length being greater than or equal to 0.08 and less than or equal to 0.3, wherein the first microstructures include: a plurality of first reflective microstructures, the tip of each of the first reflective microstructures being located between the first side surface and the edge; The second region includes a plurality of first spectral microstructures, the edge of each of the first spectral microstructures being located between the first side and the tip; and a plurality of second microstructures disposed in the second region, wherein each of the first microstructures and each of the second microstructures has a different shape.

2. The light guide plate as claimed in claim 1, wherein the first surface further comprises a mixing region located between the first region and the second region, and the first microstructures and the second microstructures are further disposed in the mixing region.

3. The light guide plate as claimed in claim 1, wherein the first beam-splitting microstructures and the first reflective microstructures are staggered in a first direction and a second direction, wherein the first direction is not parallel to the second direction.

4. The light guide plate as claimed in claim 1, wherein the number of the first beam-splitting microstructures accounts for 40% to 60% of the total number of the first microstructures, and the number of the first reflective microstructures accounts for 40% to 60% of the total number of the first microstructures.

5. The light guide plate as claimed in claim 1, wherein the base of the triangles of the first microstructures are respectively an isosceles triangle having two base angles and the apex.

6. The light guide plate as claimed in claim 1, wherein the light guide plate further comprises a plurality of auxiliary microstructures, each of the auxiliary microstructures having an auxiliary triangular base located on the first surface and having an auxiliary axis of symmetry, an opposing auxiliary edge, and an auxiliary tip, the auxiliary axis of symmetry being perpendicular to the auxiliary edge and passing through the auxiliary tip, the auxiliary tip of the auxiliary microstructure being located between the first side surface and the auxiliary edge, and the auxiliary axis of symmetry having an auxiliary microstructure angle between the normal of the first side surface and the auxiliary microstructure, the auxiliary microstructure angle being greater than or equal to 25 degrees and less than or equal to 35 degrees.

7. The light guide plate as claimed in claim 6, wherein two of the first reflective microstructures and two of the auxiliary microstructures are arranged around one of the first beam-splitting microstructures.

8. The light guide plate as claimed in claim 7, wherein the included angle of the microstructures of the first beam-splitting microstructures is 0 degrees, the included angle of the microstructures of the first reflective microstructures is 20 degrees, and two of the first reflective microstructures are symmetrically arranged, two of the auxiliary microstructures are symmetrically arranged, and the shape of each of the auxiliary microstructures is the same as the shape of each of the first microstructures.

9. The light guide plate as claimed in claim 6, wherein two of the first reflective microstructures, two of the auxiliary microstructures, and one of the first beam-splitting microstructures form a microstructure group, the first reflective microstructures, the auxiliary microstructures, and the first beam-splitting microstructures form a plurality of such microstructure groups, and the microstructure groups are uniformly distributed in the first region.

10. The light guide plate as claimed in claim 1, wherein the light guide plate further comprises a plurality of auxiliary microstructures, each of the auxiliary microstructures having an auxiliary triangular base located on the first surface and having an auxiliary axis of symmetry, an opposing auxiliary edge, and an auxiliary tip, the auxiliary axis of symmetry being perpendicular to the auxiliary edge and passing through the auxiliary tip, and the auxiliary axis of symmetry having an auxiliary microstructure angle with the normal of the first side surface, the auxiliary microstructure angle being greater than or equal to 75 degrees and less than or equal to 85 degrees.

11. The light guide plate as claimed in claim 10, wherein two of the first reflective microstructures and two of the auxiliary microstructures are arranged around one of the first beam-splitting microstructures.

12. The light guide plate as claimed in claim 11, wherein the included angle of the microstructures of the first beam-splitting microstructures is 0 degrees, the included angle of the microstructures of the first reflective microstructures is 20 degrees, and two of the first reflective microstructures are symmetrically arranged, two of the auxiliary microstructures are symmetrically arranged, and the shape of each of the auxiliary microstructures is the same as the shape of each of the first microstructures.

13. The light guide plate as claimed in claim 1, wherein the lengths are greater than or equal to 10 µm and less than or equal to 150 µm, the heights are greater than or equal to 1 µm and less than or equal to 10 µm, and the length of each of the edges is greater than or equal to 10 µm and less than or equal to 100 µm.

14. The light guide plate as claimed in claim 1, wherein the first microstructures have a plurality of interfaces and the interfaces connect the vertex and the first surface, the vertex and the interfaces each comprising a convex surface.

15. The light guide plate as claimed in claim 1, wherein the first microstructures are recessed in the first surface.

16. A display device, comprising: A light source module includes a light guide plate and a light-emitting element. The light guide plate includes a first side surface, a first surface, a plurality of first microstructures, and a plurality of second microstructures. The first surface is connected to the first side surface and has a first region and a second region. The first region is located between the first side surface and the second region. The plurality of first microstructures are disposed in the first region, wherein each of the first microstructures has a vertex and a triangular base. The triangular base is located on the first surface and has an axis of symmetry, an edge, and a tip. The edge and the tip are opposite to each other. The axis of symmetry is perpendicular to the edge and passes through the tip. The axis of symmetry has a microstructure angle with a normal of the first side surface. The microstructure angle is greater than or equal to 0 degrees and less than or equal to 20 degrees. Each of the first microstructures has a height between the vertex and the first surface, and the base of each of the triangles has a length between the edge and the tip, the ratio of the height to the length being greater than or equal to 0.08 and less than or equal to 0.3, wherein the first microstructures include a plurality of first reflective microstructures and a plurality of first beam-splitting microstructures, the tip of each of the first reflective microstructures is located between the first side surface and the edge, the edge of each of the first beam-splitting microstructures is located between the first side surface and the tip, the second microstructures are disposed in the second region, and each of the first microstructures has a different shape than each of the second microstructures, the light-emitting element is disposed opposite to the first side surface; and a display panel is disposed opposite to the light guide plate.

17. The display device as claimed in claim 16, wherein the display panel has a display surface, the display surface has an edge region and a display area, and the first region of the light guide plate is disposed corresponding to the edge region of the display surface.

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