DISPLAY PANEL, DISPLAY DEVICE, AND METHOD FOR DRIVING THE SAME

• US 20200134281A1
• Filed: 10/19/2017
• Published: 04/30/2020
• Est. Priority Date: 03/28/2017
• Status: Abandoned Application

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: HAN, Yanling, GUO, Yuzhen, QIN, Yunke, JIA, Yanan, ZHAO, Lijun
• Application Number:
  US15/778,485
• Publication Number:
  US 20200134281A1
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G06F 3/017 Gesture based interaction, e.g. based on a set of recognized hand gestures interaction based on gestures traced on a digitiser G06F3/04883
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

The disclosure discloses a display panel, a display device, and a method for driving the same, where switch transistors connected with scan signal lines are controlled by the scan signal lines to be switched on or off, and when the switch transistors are switched on, the bias voltage higher than the avalanche voltage is applied to the photosensitive diodes over the drive signal lines. While a fingerprint is being recognized, the photosensitive diodes are broken through reversely due to infrared light reflected by ridges, so that large current is produced, and output to read signal lines through sample resistors; and the photosensitive diodes corresponding valleys output zero current.

Claims

1. A display panel, comprising:

a plurality of photosensitive sensing circuits arranged in an array, a plurality of scan signal lines corresponding to each row of the plurality of photosensitive sensing circuits, and a plurality of read signal lines, and a plurality of drive signal lines, both of which correspond to each column of the plurality of photosensitive sensing circuits, the display panel is divided into a display area, and a bezel area surrounding the display area, and the display area comprises;

a plurality of pixel elements arranged in an array;

projections of the photosensitive sensing circuits in a direction perpendicular to the display panel lie at gaps between the sub-pixel areas, and each of the photosensitive sensing circuits comprises a photosensitive diode, a switch transistor and a sample resistor, wherein;

the switch transistor comprises a gate connected with a corresponding scan signal line, a source connected with a cathode of the photosensitive diode, and a drain connected with a corresponding drive signal line;

the photosensitive diode comprises an anode connected with a first end of the sample resistor, and a second end of the sample resistor is grounded; and

the first end of the sample resistor is connected with a corresponding read signal line.

2. The display panel according to claim 1, further comprises at least one infrared light-emitting source, and the photosensitive diode is an infrared photosensitive diode;

and

a projection of the infrared light-emitting source in a direction perpendicular to the display panel does not overlap with projections of the photosensitive sensing circuits in the direction.

3. The display panel according to claim 2, wherein

at least a part of the plurality of pixel elements comprise at least four sub-pixel areas, where one infrared light-emitting source is arranged in one of the sub-pixel areas, and sub-pixel structures for displaying are arranged in a rest of the sub-pixel areas.

5. The display panel according to claim 1, wherein the sub-pixel structures are organic light-emitting diodes located on an underlying substrate of the display panel, and a protective cover is arranged on a side of the organic light-emitting diodes away from the underlying substrate;

and

the photosensitive sensing circuits are located on the surface of the protective cover facing the organic light-emitting diodes.

6. The display panel according to claim 1, wherein the sub-pixel structures are organic light-emitting diodes located on an underlying substrate of the display panel, and pixel definition layers are arranged between each of the sub-pixel areas;

and

the photosensitive sensing circuits are located between the pixel definition layers and the underlying substrate.

7. The display panel according to claim 1, wherein the display panel is a liquid crystal display panel, and comprises an opposite substrate and an array substrate;

the opposite substrate and an array substrate are arranged opposite to each other; and

a black matrix is arranged on a side of the opposite substrate facing the array substrate; and

the photosensitive sensing circuits are located on a surface of the black matrix away from the opposite substrate.

8. The display panel according to claim 1, wherein the display panel is a liquid crystal display panel, and comprises an opposite substrate and an array substrate, the opposite substrate and an array substrate are arranged opposite to each other;

and

the photosensitive sensing circuits are arranged on a side of the array substrate facing the opposite substrate.

9. The display panel according to claim 7, wherein color filter sheets are arranged on a side of the opposite array substrate facing the array substrate;

and

the infrared light-emitting source comprises an infrared electroluminescent layer;

the infrared electroluminescent layer and the color filter sheets are located at a same layer.

10. The display panel according to claim 2, wherein the infrared light-emitting source is located in the bezel area.

11. A display device, comprises the display panel according to claim 1.

12. The display device according to claim 11, further comprises a front camera.

13. A method for driving the display device according to claim 11, the method comprises:

applying bias voltage to each of driver signal lines at least in a target detection area, wherein the bias voltage is higher than an avalanche voltage of the photosensitive diodes; and

scanning each of scan signal lines at least in the target detection area sequentially in rows, and obtaining at least output signals of each of read signal lines in the target detection area.

14. The driving method according to claim 13, wherein applying bias voltage to each of driver signal lines at least in a target detection area comprises:

applying the bias voltage to all of the driver signal lines; and

scanning each of scan signal lines at least in the target detection area sequentially in rows, and obtaining at least output signals of each of read signal lines in the target detection area comprises;

scanning each of the scan signal lines sequentially in rows, and obtaining the output signals of each of the read signal lines.

15. The driving method according to claim 13, wherein while a floating touch is being detected, the method further comprises:

taking a photo of a gesture using a front camera, determining positional coordinates of a gesture in a plane, and generating output signals corresponding to reflected light from a hand, and detecting differences between transmission and reception instances of time of the reflected light at different positions to calculate a longitudinal coordinate of the gesture.

16. The driving method according to claim 15, further comprises:

determining the target detection area according to determined positional coordinates of the gesture in the plane and the longitudinal coordinate.

4. (canceled)