Light-emitting module and display apparatus

Patent metadata

Field	Value
Publication number	US-10712489-B2
Application number	US-201916542415-A
Country	US
Kind code	B2
Filing date	Aug 16, 2019
Priority date	Aug 17, 2018
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

Provided are a light emitting module and a display apparatus. The light emitting module includes: a light emitting unit and a light guide plate; the light guide plate includes a first plate surface and a second plate surface opposite to each other, and a plurality of side surfaces; the light emitting unit is configured to emit light to the light guide plate from the target side surface; the first plate surface includes a plurality of target convex ridges disposed in sequence along a direction away from the light emitting unit; each target convex ridge is configured to totally reflect light emitted from the target side surface into the light guide plate to the second plate surface, angles between the target ridge surfaces of the plurality of target convex ridges and a thickness direction of the light guide plate tends to decrease.

First claim

What is claimed is:

1. A light emitting module, comprising: a light emitting unit and a light guide plate; wherein
the light guide plate comprises a first plate surface and a second plate surface opposite to each other, and a plurality of side surfaces connecting the first plate surface and the second plate surface; and the light emitting unit is close to a target side surface of the plurality of side surfaces, and is configured to emit light from the target side surface to the light guide plate;
the first plate surface has a plurality of target convex ridges disposed in sequence along a direction away from the light emitting unit, and a length direction of the target convex ridge is parallel to the target side surface; each of the target convex ridges is configured to totally reflect light emitted from the target side surface to the light guide plate to the second plate surface from a target ridge surface, away from the light emitting unit, of each target convex ridge;
wherein, in the direction away from the light emitting unit, target ridge surfaces of the plurality of target convex ridges are flat surfaces, and angles between the target ridge surfaces and a thickness direction of the light guide plate tend to decrease.

2. The light emitting module according to claim 1 , wherein the light guide plate comprises:
a first portion and a remaining portion disposed in sequence along the direction away from the light emitting unit;
the first portion and the remaining portion comprise the target convex ridges, an angle between a target ridge surface of each target convex ridge in the first portion and the thickness direction is a first angle, and an angle between a target ridge surface of each target convex ridge in the remaining portion is a second angle, and the first angle is greater than the second angle.

3. The light emitting module according to claim 1 , wherein a minimum angle of the angles between the target ridge surfaces of the plurality of target convex ridges and the thickness direction is 46.5 degrees.

4. The light emitting module according to claim 1 , wherein the target convex ridge has two ridge surfaces, and the two ridge surfaces of the target convex ridge are both flat surfaces.

5. The light emitting module according to claim 4 , wherein an angle between a ridge surface, close to the light emitting unit, of the two ridge surfaces of the target convex ridge and the thickness direction is in a range of 0˜75 degrees.

6. The light emitting module according to claim 1 , wherein the target side surface is inclined towards a side where the second plate surface is.

7. The light emitting module according to claim 6 , wherein the target side surface is a flat surface, and an angle between the target side surface and the thickness direction is in a range of 3.19˜5.19 degrees.

8. The light emitting module according to claim 1 , wherein the second plate surface has at least one first convex ridge, and the first convex ridge is in a region of the second plate surface away from the light emitting unit;
a length direction of the first convex ridge is parallel to the target side surface, the first convex ridge has two first ridge surfaces which are both flat surfaces, and a first ridge surface, close to the light emitting unit, of the two first ridge surfaces is parallel to the thickness direction.

9. The light emitting module according to claim 8 , wherein an angle between a first ridge surface, away from the light emitting unit, of the two first ridge surfaces and the thickness direction is 75 degrees.

10. The light emitting module according to claim 8 , wherein the light guide plate comprises: a first portion, a second portion and a third portion disposed in sequence along the direction away from the light emitting unit;
wherein the first portion, the second portion and the third portion all comprise the target convex ridges, an angle between a target ridge surface of each target convex ridge in the first portion and the thickness direction is a first angle, an angle between a target ridge surface of each target convex ridge in the second portion and the third portion and the thickness direction is a second angle, and the first angle is greater than the second angle; and
the third portion comprises the at least one first convex ridge.

11. The light emitting module according to claim 10 , wherein the first portion and the third portion have an equal length along the direction away from the light emitting unit.

12. The light emitting module according to claim 1 , further comprising: a lens assembly between the light emitting unit and the light guide plate; wherein
the light emitting unit is configured to emit light to the lens assembly, and the lens assembly is configured to adjust light emitted from the light emitting unit to parallel light perpendicular to the thickness direction and emit the parallel light to the light guide plate.

13. The light emitting module according to claim 12 , wherein the lens assembly comprises:
a lens film and a first prism film disposed in sequence along the direction away from the light emitting unit; wherein
the lens film is configured to converge the light emitted from the light emitting unit, and emit converged light to the first prism film; and
the first prism film is configured to adjust light emitted from the lens film to the parallel light, and emit the parallel light to the light guide plate.

14. The light emitting module according to claim 13 , wherein the lens film comprises: a lens film body, and a reflection layer attached on a side of the lens film body close to the light emitting unit, a protrusion structure is on a light emitting surface on a side, away from the light emitting unit, of the lens film body, wherein the protrusion structure comprises: a first convex lens protruding from the light emitting surface, and a second convex lens protruding from a central position of a surface of the first convex lens, the reflection layer comprises a hollow region corresponding to the second convex lens, and an orthographic projection of the hollow region on the lens film body is within a region where the second convex lens is; and
the first prism film comprises: a prism unit corresponding to the protrusion structure, wherein the lens unit comprises two forward truncated cones disposed in sequence along the direction away from the light emitting unit, the two forward truncated cones have an equal area of upper base surfaces and share a lower base surface, and heights of the two forward truncated cones decrease progressively along the direction away from the light emitting unit; in the protrusion structure and the prism unit corresponding to the protrusion structure, an orthographic projection of any of the two forward truncated cones on the lens film body is within the region where the second convex lens is.

15. The light emitting module according to claim 1 , further comprising: a second prism film on a side where the second plate surface of the light guide plate is; wherein
a plurality of second convex ridges are on a surface, facing towards the light guide plate, of the second prism film, a length direction of the second convex ridge is perpendicular to the length direction of the target convex ridge, the second convex ridge has two second ridge surfaces, and a second ridge surface, close to a center of the second prism film, of the two second ridge surfaces is a flat surface and is parallel to the thickness direction.

16. The light emitting module according to claim 15 , wherein in the plurality of second convex ridges, two second convex ridges closest

Assignees

• Boe Technology Group Co Ltd
• Hefei Boe Optoelectronics Tech

Inventors

• Zhang Bing
• Gao Lu
• Gao Liang
• Qin Jianwei
• Geng Xiaolin

Classifications

• G02B6/003

  Lens or lenticular sheet or layer · CPC title

• G02B6/0038 Primary

  Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide · CPC title

• G02B6/0025

  Diffusing sheet or layer; Prismatic sheet or layer · CPC title

• G02B6/0061

  to provide homogeneous light output intensity · CPC title

• G02B6/0031

  Reflecting element, sheet or layer · CPC title