Display panel, display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-11675238-B2
Application number	US-202017274546-A
Country	US
Kind code	B2
Filing date	Jul 16, 2020
Priority date	Jul 18, 2019
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A display panel includes: a first substrate and a second substrate; and a liquid crystal layer. The first substrate includes a first base, and a light extraction portion and a light conversion portion that are disposed on a first side and located in each sub-pixel region. The first base has the first side facing the second substrate. A refractive index of the light extraction portion is greater than or equal to a refractive index of the first base, and a refractive index of a portion of the light conversion portion in direct contact with the first base is less than the refractive index of the first base. The second substrate includes a second base, and at least one light reflecting structure and at least one light absorbing structure that are disposed at a side of the second base facing the first substrate and located in the sub-pixel region.

First claim

What is claimed is:

1. A display panel having a display area including a plurality of sub-pixel regions, the display panel comprising:
a first substrate and a second substrate that are oppositely arranged; and
a liquid crystal layer disposed between the first substrate and the second substrate, wherein
the first substrate includes:
a first base having a first side facing the second substrate and a plurality of second sides intersecting the first side; and
a light extraction portion and a light conversion portion that are disposed on the first side and located in each sub-pixel region, a refractive index of the light extraction portion being greater than or equal to a refractive index of the first base, a refractive index of a portion of the light conversion portion in direct contact with the first base being less than the refractive index of the first base, and at least one second side being a light incident surface;
the second substrate includes:
a second base;
at least one light reflecting structure and at least one light absorbing structure that are disposed at a side of the second base facing the first substrate and located in a sub-pixel region of the plurality of sub-pixel regions; at least one side of the light reflecting structure being provided with the light absorbing structure; and
the light reflecting structure is configured to reflect light that exits from the light extraction portion, passes through the liquid crystal layer, and is incident onto the light reflecting structure, so that the reflected light passes through the first substrate to exit; the light absorbing structure is configured to absorb light that exits from the light extraction portion, passes through the liquid crystal layer, and is incident onto the light absorbing structure.

2. The display panel according to claim 1 , wherein a shape of an orthographic projection of the light extraction portion on the first base includes a stripe shape, a shape of an orthographic projection of the light reflecting structure on the first base includes a stripe shape, and a shape of an orthographic projection of the light absorbing structure on the first base includes a stripe shape; and
an extending direction of the light extraction portion, an extending direction of the light reflecting structure and an extending direction of the light absorbing structure are all parallel to the light incident surface.

3. The display panel according to claim 1 , wherein the light reflecting structure is in direct contact with the light absorbing structure, and an orthographic projection of the light absorbing structure on the first side of the first base is farther away from an orthographic projection of the light extraction portion on the first side of the first base than an orthographic projection of the light reflecting structure on the first side of the first base.

4. The display panel according to claim 1 , wherein the light reflecting structure is in direct contact with the light absorbing structure, and an orthographic projection of the light absorbing structure on the first side of the first base is closer to an orthographic projection of the light extraction portion on the first side of the first base than an orthographic projection of the light reflecting structure on the first side of the first base.

5. The display panel according to claim 1 , wherein the light extraction portion is in direct contact with the light conversion portion.

6. The display panel according to claim 1 , wherein the light conversion portion has a structure of at least one film, wherein
the light conversion portion has a structure of a single film, a refractive index of the light conversion portion is less than the refractive index of the first base, and the light conversion portion includes a primary color filter portion; or
the light conversion portion has a structure in which a plurality of films are stacked, the light conversion portion includes a first sub-layer and a second sub-layer that are arranged in a stack;
the first sub-layer is disposed on the first side of the first base, the first sub-layer is made of a transparent material, and a refractive index of the first sub-layer is less than the refractive index of the first base; and
the second sub-layer is disposed on a surface of the first sub-layer away from the first base, and the second sub-layer includes a primary color filter portion.

7. The display panel according to claim 1 , wherein the light reflecting structure includes an inclined reflective surface, and the inclined reflective surface faces the light extraction portion; the inclined reflective surface and a surface of the second base facing the first base have an included angle therebetween, and the included angle is an acute angle; and
the inclined reflective surface is configured to reflect light that exits from the light extraction portion, passes through the liquid crystal layer, and is incident onto the inclined reflective surface, so that the reflected light passes through the first substrate to exit.

8. The display panel according to claim 7 , wherein the light reflecting structure includes a body, and the body is in a shape of a triangular prism;
the body includes an inclined surface, a first prismatic surface and a second prismatic surface that are sequentially connected, the first prismatic surface faces the second base, and an included angle between the second prismatic surface and the first prismatic surface is greater than or equal to an included angle between light incident onto the light reflecting structure and the first prismatic surface;
a material of the body includes a light reflecting material; the inclined surface is the inclined reflective surface; or
the body is made of an organic material; the light reflecting structure further includes a reflective layer disposed on the inclined surface, and the reflective layer includes the inclined reflective surface.

9. The display panel according to claim 7 , wherein the included angle between the inclined reflective surface and the surface of the second base facing the first base is in a range from 27° to 37°.

10. The display panel according to claim 9 , wherein in a thickness direction of the second base, a distance between an end of the inclined reflective surface proximate to the second base and an end of the inclined reflective surface away from the second base is in a range from 4.5 μm to 10.5 μm.

11. The display panel according to claim 1 , wherein the light absorbing structure includes a black matrix and/or a black spacer.

12. The display panel according to claim 11 , wherein the light absorbing structure includes the black matrix and the black spacer,
the black spacer is located on a side of the black matrix away from the second base, and is in direct contact with the black matrix; and
a distance between an edge of the light reflecting structure proximate to the black spacer and an edge of the black spacer proximate to the light reflecting structure in a direction from the light incident surface pointing to a second side opposite to the light incident surface is greater than a distance between the edge of the light reflecting structure proximate to the black spacer and an edge of the black matrix proximate to the light reflecting structure in the direction from the light incident surface pointing to the second side opposite to the light incident surface.

13. The display panel according to claim 11 , wherein the light absorbing structure includes the black spacer,
the first substrate further includes an opposite black spacer disposed at a side of the light conversion portion away from the first base, and an orthograph

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Qian
• Dong Xue
• Zhang Qingxun
• Chen Xiaochuan
• Zhao Wenqing
• Li Zhongxiao

Classifications

• G02F1/13398

  Spacer materials; Spacer properties · CPC title

• G09G3/3413

  Details of control of colour illumination sources · CPC title

• G02F1/13394

  spacers regularly patterned on the cell subtrate, e.g. walls, pillars (G02F1/133377 takes precedence) · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F1/136209 Primary

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title