Display module, display device and calculation method

Patent metadata

Field	Value
Publication number	US-12228809-B2
Application number	US-202218027532-A
Country	US
Kind code	B2
Filing date	Apr 29, 2022
Priority date	Apr 29, 2022
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A display module includes a back plate, a light guide plate, a rubber frame and a display panel, the light guide plate is fixed on a bearing surface, a connecting line between two end portions of the bearing surface forms a first curve. The first curve includes a circular arc segment and a transition curve segment, and bends in a direction away from the display panel; the circular arc segment is located at the middle, at least one end of the circular arc segment is provided with the transition curve segment; the transition curve segment is located at a first position, the first position being a position of the bearing surface opposite to a second position, the second position being a position where light leaks from the display panel, the radius of curvature of the transition curve increases along a direction close to an end portion of the first curve.

First claim

The invention claimed is:

1. A display module, comprising a back plate, a light guide plate fixed on the back plate, a rubber frame attached on the back plate and a display panel disposed on the rubber frame, wherein the back plate comprises a bearing surface and a back surface opposite to the bearing surface;
wherein the light guide plate is fixed on the bearing surface, a connecting line between two end portions of the bearing surface forms a first curve, the first curve comprises at least a circular arc segment and a transition curve segment, and the first curve bends in a direction away from the display panel;
wherein the circular arc segment is located at a middle of the first curve, and at least one end of the circular arc segment is provided with the transition curve segment;
wherein the transition curve segment is located at a first position of the bearing surface, the first position being a position of the bearing surface opposite to a second position of the display panel, and the second position being a position where light leaks from the display panel, and a radius of curvature of the transition curve segment gradually increases along a direction close to an end portion of the first curve.

2. The display module according to claim 1 , wherein the first curve comprises a first transition curve segment and a second transition curve segment;
wherein the first transition curve segment and the second transition curve segment are respectively located at both ends of the circular arc segment, and the first transition curve segment and the second transition curve segment are both located at a position of the bearing surface.

3. The display module according to claim 2 , wherein the first curve further comprises a first straight line segment and a second straight line segment;
wherein the first straight line segment is located at an end portion of the first transition curve segment, the second straight line segment is located at an end portion of the second transition curve segment, and the first straight line segment and the second straight line segment are respectively located at both end portions of the first curve.

4. The display module according to claim 3 , wherein the first straight line segment is tangent to an end point of the first transition curve segment distal to the circular arc segment;
wherein the second straight line segment is tangent to an end point of the second transition curve segment distal to the circular arc segment.

5. The display module according to claim 2 , wherein the first transition curve segment and the second transition curve segment are symmetrically distributed on both sides of the circular arc segment, and a center of the circular arc segment coincides with a center of the first curve.

6. The display module according to claim 5 , wherein a radius of curvature of the first transition curve segment at a first point is equal to a radius of curvature of the second transition curve segment at a second point, wherein a distance between the first point and the center point of the circular arc segment is equal to a distance between the second point and the center point of the circular arc segment.

7. The display module according to claim 1 , wherein an arc length of the circular arc segment is equal to one quarter of an arc length of the first curve.

8. The display module according to claim 1 , wherein an arc length of the transition curve segment is equal to three-eighths of an arc length of the first curve.

9. A calculation method for calculating the first curve according to claim 1 , wherein the calculation method comprises:
obtaining a cubic parabola mathematical expression of the transition curve segment, wherein the mathematical expression has a cubic parabolic constant;
determining a value of the cubic parabolic constant of the transition curve segment based on a first value, wherein the first value comprises an arc length of the circular arc segment, an arc length of the transition curve segment and a radius of curvature of the circular arc segment, or the first value comprises the arc length of the circular arc segment, the arc length of the transition curve segment and a chord height of the circular arc segment; and
determining the first curve based on the value of the cubic parabolic constant of the transition curve segment and the first value.

10. The calculation method according to claim 9 , wherein in the case where the first value comprises the arc length of the circular arc segment, the arc length of the transition curve segment, and the radius of curvature of the circular arc segment, the determining a value of the cubic parabolic constant of the transition curve segment based on a first value comprises:
performing integration on the cubic parabola mathematical expression, and obtaining an integral expression;
performing a power series expansion on the integral expression, and obtaining an expansion expression, wherein the expansion expression is a relational expression of the arc length of the transition curve segment and the cubic parabolic constant, and the expansion expression has an undetermined value;
obtaining a curvature expression of the transition curve segment, wherein the curvature expression is a relational expression of the cubic parabolic constant, the undetermined value, and an undetermined radius of curvature;
obtaining at least one target value of the parabolic constant, and determining a target undetermined value in the expansion expression based on the target value and the expansion expression;
determining an undetermined radius of curvature value based on the target undetermined value, the target value, and the curvature expression; and
when the undetermined radius of curvature value is equal to the radius of curvature of the circular arc segment, taking the target value as the value of the cubic parabolic constant of the transition curve segment.

11. The calculation method according to claim 10 , wherein the expansion expression is:

x
+

x
5

40
⁢

c
2

-

x
9

1152
⁢

c
4

+

x
13

13312
⁢

c
6

-

x
17

111411.2

c
8

=
S

;

the curvature expression is:

Assignees

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

Inventors

• Zhang Han
• Lai Shuwen
• Diao Kai
• Hu Long
• Ren Liangliang
• Lin Yuhang
• Fang Lian
• Liu Chengkun
• Zheng Dingjie
• Guo Zhijie
• Chen Zhiying
• Cui Ting

Classifications

• G02F1/133524 Primary

  Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides · CPC title

• G02F1/133308

  Support structures for LCD panels, e.g. frames or bezels · CPC title

• G02F1/133314 Primary

  Back frames · CPC title

• G09F9/302

  characterised by the form or geometrical disposition of the individual elements · CPC title

• G02F1/1333

  Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) · CPC title