Backlight module, display panel and display device

• US 10,437,099 B2
• Filed: 09/15/2017
• Issued: 10/08/2019
• Est. Priority Date: 01/17/2017
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Wang, Fei, Wang, Dan, Qiu, Yun
• Primary Examiner(s): Bannan, Julie A
• Application Number:
  US15/706,423
• Publication Number:
  US 20180203299A1
• Time in Patent Office: 753 Days
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/13362 providing polarized light, e.g. by converting a polarisation component into another one

Abstract

A backlight module comprises a light source, a light guide plate and at least one transparent light guide structure. Each transparent light guide structure comprises a first surface adjacent to a side of the light guide plate and a second surface far away from the light guide plate, a light emitted by the light source is directed into the first surface of the transparent light guide structure through the light guide plate. Each transparent light guide structure is configured to change a propagation direction of a first light in the light emitted by the light source, so that an emergence angle of the first light emitted from the second surface is smaller than an incidence angle of the first light incident from the first surface. The incidence angle of the first light onto the first surface is less than 90 degrees.

Claims

1. A display panel comprising:

a substrate;

a wire grid polarizer provided on a light output side of the substrate;

a flat transparent layer provided on the substrate provided with the wire grid polarizer, the wire grid polarizer being provided between the substrate and the flat transparent layer; and

a thin film transistor structure provided on a side of the flat transparent layer remote from the substrate,

wherein the wire grid polarizer comprises a plurality of intersecting metal wires that form a metal mesh structure.

2. The display panel according to claim 1, further comprising at least one transparent light guide structure provided on a light input side of the substrate,

wherein each transparent light guide structure comprises a first surface remote from the substrate and a second surface adjacent to the substrate;

wherein each transparent light guide structure is configured to change a propagation direction of a first light incident from the first surface, so that an emergence angle of the first light emitted from the second surface is smaller than an incidence angle of the first light incident from the first surface, and

wherein the incidence angle of the first light onto the first surface is less than 90 degrees.

3. The display panel according to claim 2, wherein an area of the first surface is smaller than that of the second surface.

4. The display panel according to claim 3,

wherein a cross-section area of each transparent light guide structure increases gradually from the first surface to the second surface;

and

wherein each transparent light guide structure comprises at least one prism frustum sequentially superposed;

or

each transparent light guide structure comprises at least one circular truncated cone sequentially superposed;

or

a side surface of each transparent light guide structure between the first surface and the second surface comprises an arc surface.

5. The display panel according to claim 2,

wherein a first reflection layer is provided on a side surface of the transparent light guide structure between the first surface and the second surface, the first reflection layer having a reflection surface adjacent to the side surface of the transparent light guide structure.

6. The display panel according to claim 2,

wherein an arrangement density of the transparent light guide structure increases gradually in a direction remote from a light source for emitting the first light.

7. A display device comprising the display panel according to claim 1.

8. A display panel comprising:

a substrate;

a thin film transistor structure provided on a light output side of the substrate;

a wire grid polarizer provided on a light input side of the substrate; and

at least one transparent light guide structure provided on a side of the wire grid polarizer remote from the substrate, the wire grid polarizer being provided between the substrate and the at least one transparent light guide structure,

wherein the wire grid polarizer comprises a plurality of intersecting metal wires that form a metal mesh structure.

9. The display panel according to claim 8,

wherein each transparent light guide structure comprises a first surface remote from the substrate and a second surface adjacent to the substrate;

wherein each transparent light guide structure is configured to change a propagation direction of a first light incident from the first surface, so that an emergence angle of the first light emitted from the second surface is smaller than an incidence angle of the first light incident from the first surface, and

wherein the incidence angle of the first light onto the first surface is less than 90 degrees.

10. The display panel according to claim 9, wherein an area of the first surface is smaller than that of the second surface.

11. The display panel according to claim 10,

wherein a cross-section area of each transparent light guide structure increases gradually from the first surface to the second surface;

and

wherein each transparent light guide structure comprises at least one prism frustum sequentially superposed;

or

each transparent light guide structure comprises at least one circular truncated cone sequentially superposed;

or

a side surface of each transparent light guide structure between the first surface and the second surface comprises an arc surface.

12. The display panel according to claim 9,

wherein a first reflection layer is provided on a side surface of the transparent light guide structure between the first surface and the second surface, the first reflection layer having a reflection surface adjacent to the side surface of the transparent light guide structure.

13. The display panel according to claim 9,

wherein an arrangement density of the transparent light guide structure is gradually increased in a direction remote from a light source for emitting the first light.

14. A display device comprising the display panel according to claim 8.