DISPLAY PANEL, DISPLAY DEVICE AND DRIVING METHOD FOR DISPLAY DEVICE

• US 20200135817A1
• Filed: 05/28/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: Wuhan Tianma Micro-Electronics Company Limited (Wuhan Donghu New Technology Development Zone Production Promotion Centre), Wuhan Tianma Microelectronics Company Limited Shanghai Branch
• Original Assignee: Shanghai Tianma AM-OLED Co. Ltd (Tianma Microelectronics Company Limited)
• Inventors: WANG, Xue, LIU, Haimin, XIONG, Zhiyong
• Granted Patent: US 10,804,346 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/0955 Lenses lenses per se G02B3/00
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/60 OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
• CPC Class Codes: H10K 59/8051 Anodes
• CPC Class Codes: H10K 59/8052 Cathodes

Abstract

The present disclosure provides a display panel, a display device, and a method for driving a display device. The display panel has a display region, a partial region of which is reused as a photographing photosensitive region. The display panel includes: a first substrate; a second substrate disposed opposite to the first substrate; a plurality of pixel units disposed in the display region, and a plurality of photosensitive elements disposed in the photographing photosensitive region. The first substrate is located on a side of the second substrate facing a light-emitting surface, the plurality of pixel units is formed on the second substrate, each of the plurality of pixel units includes a pixel circuit and a light-emitting element, and a planarization layer is arranged between the pixel circuit and the light-emitting element, and the plurality of photosensitive elements is located on a side of the planarization layer facing the first substrate.

Claims

1. A display panel, the display panel having a display region and a partial region of the display region being reused as a photographing photosensitive region, the display panel comprising:

a first substrate;

a second substrate disposed opposite to the first substrate;

a plurality of pixel units disposed in the display region; and

a plurality of photosensitive elements disposed in the photographing photosensitive region,

wherein the first substrate is located on a side of the second substrate facing a light-emitting surface of the display panel, the plurality of pixel units is formed on the second substrate, each of the plurality of pixel units comprises a pixel circuit and a light-emitting element, and a planarization layer is arranged between the pixel circuit and the light-emitting element, and the plurality of photosensitive elements is located on a side of the planarization layer facing the first substrate.

2. The display panel according to claim 1, wherein each of the plurality of photosensitive elements comprises a convex lens, an infrared filter, a sensor and a signal transmission line sequentially in a direction from the first substrate towards the second substrate.

3. The display panel according to claim 1, wherein the plurality of photosensitive elements is integrated in the plurality of pixel units.

4. The display panel according to claim 3, wherein the light-emitting element comprises an anode layer, a pixel definition layer, a light-emitting layer and a cathode layer;

wherein the anode layer is located on a side of the planarization layer facing away from the second substrate, the pixel definition layer is located on a side of the anode layer facing away from the planarization layer, and the cathode layer is located on a side of the pixel definition layer facing away from the second substrate;

the pixel definition layer has a first etch hole, the light-emitting layer is located in the first etch hole, the pixel definition layer in the photographing photosensitive region further has a second etch hole, and one of the plurality of photosensitive elements is located in the second etch hole.

5. The display panel according to claim 4, wherein an orthographic projection of the cathode layer in the photographing photosensitive region on the second substrate overlaps with an orthographic projection of the light-emitting layer in the photographing photosensitive region on the second substrate, and

wherein the plurality of photosensitive elements is located between the planarization layer and the first substrate.

6. The display panel according to claim 4, wherein the cathode layer is made of a transparent conductive material, and an orthographic projection of the cathode layer on the second substrate covers the display region, and

wherein the plurality of photosensitive elements is located between the planarization layer and the cathode layer.

7. The display panel according to claim 4, wherein a portion of the anode layer is located in the second etch hole, an insulation layer is further arranged in the second etch hole, and the insulation layer is located between the one of the plurality of photosensitive elements and the anode layer.

8. The display panel according to claim 3, wherein M photosensitive elements of the plurality of photosensitive elements are integrated in each pixel unit of the plurality of pixel units in the photographing photosensitive region, where 10≤

M≤

50.

9. The display panel according to claim 1, wherein the plurality of photosensitive elements is disposed on a surface of the first substrate facing the second substrate.

10. The display panel according to claim 9, wherein the light-emitting element comprises an anode layer, a pixel definition layer, a light-emitting layer and a cathode layer, and

wherein an orthographic projection of the plurality of photosensitive elements on the second substrate does not overlap with an orthographic projection of the light-emitting layer on the second substrate.

11. The display panel according to claim 1, wherein the plurality of pixel units comprises at least two first pixel circuits and a second pixel circuit, wherein the at least two first pixel circuits are located in the photographing photosensitive region, and the second pixel circuit is located in a part of the display region other than the photographing photosensitive region,

wherein a length of each of the at least two first pixel circuits in a first direction is smaller than a length of the second pixel circuit in the first direction, and/or a length of each of the at least two first pixel circuits in a second direction is smaller than a length of the second pixel circuit in the second direction, and the first direction intersects with the second direction, and

wherein a high light transmissive region is formed between two adjacent first pixel circuits of the at least two first pixel circuits, and at least one of the plurality of photosensitive elements is disposed correspondingly to the high light transmissive region.

12. The display panel according to claim 11, wherein the length of the first pixel circuit in the first direction is L1, and the length of the second pixel circuit in the first direction is L2, where 2 μ

m≤

L2−

L1≤

10 μ

m.

13. The display panel according to claim 11, wherein the length of the first pixel circuit in the second direction is L3, and the length of the second pixel circuit in the first direction is L4, where 2 μ

m≤

L4−

L3≤

15 μ

m.

14. The display panel according to claim 11, wherein the at least one of the plurality of photosensitive elements is evenly distributed in the high light transmissive region.

15. The display panel according to claim 11, wherein the light-emitting element comprises an anode layer, a pixel definition layer, a light-emitting layer and a cathode layer, and the anode layer and the cathode layer are made of a transparent conductive material.

16. The display panel according to claim 1, further comprising a polarizer disposed on a surface of the first substrate, and a region in the polarizer corresponding to the plurality of photosensitive elements is hollowed out.

17. A display device, comprising:

the display panel according to claim 1;

a mode determining unit configured to determine whether the display panel is in a photographing mode, and

a control unit electrically connected to the mode determining unit and configured to;

when the display panel is in the photographing mode, control some of the plurality of pixel units arranged in a part of the display region other than the photographing photosensitive region to emit light, control some of the plurality of pixel units arranged in the photographing photosensitive region not to emit light, and generate an image according to electrical signals generated by the plurality of photosensitive elements; and

when the display panel is not in the photographing mode, control the plurality of pixel units in the display region to emit light.

18. The display device according to claim 17, wherein the control unit comprises:

a display control module electrically connected to the mode determining unit and configured to;

when the display panel is in the photographing mode, control some of the plurality of pixel units arranged in the part of the display region other than the photographing photosensitive region to emit light and control some of the plurality of pixel units arranged in the photographing photosensitive region not to emit light; and

when the display panel is not in the photographing mode, control the plurality of pixel units in the display region to emit light;

a plurality of imaging modules electrically connected to the plurality of photosensitive elements in one-to-one correspondence and electrically connected to the mode determining unit, and configured to;

when the display panel is in the photographing mode, generate a plurality of images based on respective electrical signals generated by the plurality of photosensitive elements; and

an integration module electrically connected to the plurality of imaging modules and configured to integrate the plurality of images generated by the plurality of imaging modules to generate a complete image.

19. A method for diving a display device, applied to the display device according to claim 17, comprising:

step S1 of determining, by the mode determining unit, whether the display panel is in the photographing mode, if yes, proceeding to step S2, and if not, proceeding to step S3;

step S2 of controlling, by the control unit, some of the plurality of pixel units arranged in the part of the display region other than the photographing photosensitive region to emit light and some of the plurality of pixel units arranged in the photographing photosensitive region not to emit light, and generating, by the control unit, an image based on electrical signals generated by the plurality of photosensitive elements; and

step S3 of controlling, by the control unit, the plurality of pixel units in the display region to emit light.

20. The method according to claim 19, wherein the control unit comprises a display control module electrically connected to the mode determining unit, a plurality of imaging modules electrically connected to the plurality of photosensitive elements in one-to-one correspondence and electrically connected to the mode determining unit, and an integration module electrically connected to the plurality of imaging modules,

wherein the step S2 comprises:

controlling, by the display control module, some of the plurality of pixel units arranged in the part of the display region other than the photographing photosensitive region to emit light and some of the plurality of pixel units arranged in the photographing photosensitive region not to emit light;

generating, by the plurality of imaging modules, a plurality of images based on respective electrical signals generated by the plurality of photosensitive elements; and

integrating, by the integration module, the plurality of images generated by the plurality of imaging modules to generate a complete image.