Curved optical plate and method of manufacturing the same, backlight module and display device

Patent metadata

Field	Value
Publication number	US-2024210614-A1
Application number	US-202218027294-A
Country	US
Kind code	A1
Filing date	Jun 29, 2022
Priority date	Jun 29, 2022
Publication date	Jun 27, 2024
Grant date	—

Abstract

A curved optical plate includes a curved light exit surface including at least one curved edge and at least one uncurved edge, and at least one first side surface connected to the at least one uncurved edge of the light exit surface; a first side surface includes a first surface, and the first surface extends toward an interior of the curved optical plate.

First claim

1 . A curved optical plate, comprising:
a curved light exit surface including at least one curved edge and at least one uncurved edge; and at least one first connected to the at least one uncurved edge; wherein a first side surface includes a first surface, and the first surface extends toward an interior of the curved optical plate.

2 . The curved optical plate according to claim 1 , wherein the first surface is in a shape of a plane, and an included angle between the first surface and a tangent plane where an uncurved edge connected side surface is located is less than 90°.

3 . The curved optical plate according to claim 1 , wherein the first surface is in a shape of a curved surface; the curved surface protrudes towards a direction away from the light exit surface, or the curved surface protrudes towards a direction proximate to the light exit surface.

4 . The curved optical plate according to claim 1 , wherein the first side surface further includes a second surface, and the second surface is connected to the first surface and the light exit surface.

5 . The curved optical plate according to claim 4 , wherein the second surface extends toward the interior of the curved optical plate.

6 . The curved optical plate according to claim 1 , further comprising a bottom surface, the bottom surface being opposite to the light exit surface; wherein
the first side surface further includes a third surface, and the third surface is connected to the bottom surface and the first surface.

7 . The curved optical plate according to claim 6 , wherein the third surface extends toward the interior of the curved optical plate.

8 . The curved optical plate according to claim 1 , further comprising at least one second side surface connected to the curved edge; wherein a second side surface includes another first surface.

9 . The curved optical plate according to claim 1 , wherein the curved optical plate is a light guide plate or a diffuser plate.

10 . A backlight module, comprising:
a backboard including a bottom plate and a surrounding plate that extends from an edge of the bottom plate to a side of the bottom plate; the bottom plate and the surrounding plate defining an accommodation space; a light source located in the accommodation space; and a curved optical plate located in the accommodation space; wherein a light incident surface of the curved optical plate faces the light source; the curved optical plate includes a curved light exit surface including at least one curved edge and at least one uncurved edge, and at least one first side surface connected to the uncurved edge of the light exit surface; a first side surface includes a first surface, and the first surface extends towards an interior of the curved optical plate.

11 . The backlight module according to claim 10 , wherein an orthographic projection of the first surface on the bottom plate is at least partially located within an orthographic projection of the light exit surface on the bottom plate.

12 . The backlight module according to claim 10 , wherein the curved optical plate further includes a bottom surface; the bottom surface of the curved optical plate is opposite to the light exit surface, and an orthographic projection of the bottom surface on the bottom plate is located within an orthographic projection of the light exit surface on the bottom plate.

13 . The backlight module according to claim 10 , wherein the curved optical plate further includes at least one second side surface connected to the curved edge of the light exit surface, and a second side surface includes another first surface.

14 . The backlight module according to claim 13 , wherein the backlight module is an edge-lit backlight module; the light source is located between the curved optical plate and the surrounding plate;
the first side surface is the light incident surface, and/or the second side surface is the light incident surface; the light incident surface is opposite to the light source.

15 . The backlight module according to claim 14 , wherein the curved optical plate is a light guide plate;
the backlight module further comprises a reflective film; wherein the reflective film covers the bottom surface of the light guide plate, and an area of the reflective film is less than an area of the light exit surface.

16 . The backlight module according to claim 10 , wherein the backlight module is a direct-lit backlight module; the light source is located between the curved optical plate and the bottom plate;
the curved optical plate further includes a bottom surface opposite to the light exit surface, and the bottom surface is the light incident surface and is opposite to the light source.

17 . A display device, comprising a backlight module and a display panel located on a light exit side of the backlight module; wherein the backlight module is the backlight module according to claim 10 .

18 . A method of manufacturing a curved optical plate, comprising:
providing an initial optical plate; and processing the initial optical plate to form the curved optical plate; wherein the curved optical plate includes a light exit surface, and at least one first side surface connected to at least one uncurved edge of the light exit surface; a first side surface includes a first surface, and the first surface extends towards an interior of the curved optical plate.

19 . The method of manufacturing the curved optical plate according to claim 18 , wherein processing the initial optical plate to form the curved optical plate includes:
bending the initial optical plate, so as to form a first transition optical plate having a concave surface; and removing at least a portion, located outside the concave surface of the first transition optical plate, of an end of the first transition optical plate, so as to form the curved optical plate having the first surface.

20 . The method of manufacturing the curved optical plate according to claim 18 , wherein processing the initial optical plate to form the curved optical plate includes:
removing at least a portion, proximate to a first side, of an end of the initial optical plate, so as to form a second transition optical plate having the first surface; and bending the second transition optical plate, so as to form the curved optical plate; wherein the first surface is located outside a concave surface of the curved optical plate; a convex surface of the curved optical plate faces the first side.

Assignees

• Fuzhou Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Lin Yuhang
• Chen Zhiying
• Liu Chengkun
• Zhang Han
• Zhao Hongyu
• Chen Ming
• Guo Zhijie
• Fang Lian
• Hu Long
• Cui Ting
• Ren Liangliang
• Diao Kai

Classifications

• G02B6/002

  by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces · CPC title

• G02F1/1336

  Illuminating devices · CPC title

• G02B6/0081 Primary

  Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging · CPC title

• G02B6/0088

  of the light guide or other optical sheets in the package · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title