OLED display panel, driving method thereof and display device

• US 10,713,999 B2
• Filed: 08/24/2018
• Issued: 07/14/2020
• Est. Priority Date: 01/05/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Sun, Yanliu
• Primary Examiner(s): Davis, Tony O
• Application Number:
  US16/111,871
• Publication Number:
  US 20190213948A1
• Time in Patent Office: 690 Days
• Field of Search: 345170-178
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H01L 27/14678 Contact-type imagers
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/65 OLEDs integrated with inorganic image sensors
• CPC Class Codes: H10K 59/878 comprising reflective means
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers

Abstract

The disclosure discloses an OLED display panel, a driving method thereof and a display device. In a texture recognition period, a first light emitting element in a texture recognition area is controlled to be in an off state, wherein the first light emitting element includes at least a light emitting element of which a spacing from an edge of a pinhole imaging area is closest in the texture recognition area; and then an image of an object, formed through the pinhole imaging area, is obtained by an image sensor, the object being in the texture recognition area and above the display panel, so as to implement the texture collection and recognition functions.

Claims

1. A driving method of an Organic Light Emitting Diode (OLED) display panel, comprising:

in a texture recognition period, controlling a first light emitting element in a texture recognition area to be in an off state, wherein the first light emitting element comprises at least a light emitting element of which a spacing from an edge of a pinhole imaging area is closest in the texture recognition area; and

obtaining, by an image sensor, an image of an object formed through the pinhole imaging area, the object being in the texture recognition area and above the display panel;

wherein the first light emitting element comprises all light emitting elements of which spacings from the edge of the pinhole imaging area are smaller than a preset spacing in the texture recognition area;

the preset spacing is determined according to a distance between a strong reflection interface in the OLED display panel and an upper surface of a light shading layer having the pinhole imaging area, a distance between the strong reflection interface in the OLED display panel and an upper surface of the light emitting element, and a maximum angle at which the image sensor in the OLED display panel receives light.

2. The driving method of claim 1, wherein the preset spacing L is determined by a following formula:

L=(x₁+x₂)*tan θ

wherein x₂ is the distance between the strong reflection interface in the OLED display panel and the upper surface of the light shading layer having the pinhole imaging area;

x₁ is the distance between the strong reflection interface in the OLED display panel and the upper surface of the light emitting element; and

θ

is the maximum angle at which the image sensor in the OLED display panel receives light.

3. The driving method of claim 2, wherein the first light emitting element comprises two rings of light emitting elements of which the center is the pinhole imaging area in the texture recognition area.

4. The driving method of claim 3, further comprising:

in the texture recognition period, controlling a second light emitting element in the texture recognition area to be in a light emitting state, wherein the second light emitting element is another light emitting element than the first light emitting element in the texture recognition area.

5. The driving method of claim 3, further comprising:

determining the texture recognition area in a display area of the OLED display panel;

or taking a whole display area of the OLED display panel as the texture recognition area.

6. The driving method of claim 2, further comprising:

in the texture recognition period, controlling a second light emitting element in the texture recognition area to be in a light emitting state, wherein the second light emitting element is another light emitting element than the first light emitting element in the texture recognition area.

7. The driving method of claim 2, further comprising:

determining the texture recognition area in a display area of the OLED display panel;

or taking a whole display area of the OLED display panel as the texture recognition area.

8. The driving method of claim 1, further comprising:

in the texture recognition period, controlling a second light emitting element in the texture recognition area to be in a light emitting state, wherein the second light emitting element is another light emitting element than the first light emitting element in the texture recognition area.

9. The driving method of claim 8, wherein the second light emitting element comprises at least one light emitting element located between two adjacent pinhole imaging areas in the texture recognition area.

10. The driving method of claim 9, wherein in the texture recognition area, the number of the second light emitting elements between every two adjacent pinhole imaging areas is same.

11. The driving method of claim 1, further comprising:

determining the texture recognition area in a display area of the OLED display panel;

or taking a whole display area of the OLED display panel as the texture recognition area.

12. The driving method of claim 11, wherein determining the texture recognition area in the display area of the OLED display panel, comprises:

determining a touch area according to a touch module in the OLED display panel; and

taking the touch area as the texture recognition area.

13. An Organic Light Emitting Diode (OLED) display panel, which is driven by the driving method of claim 1, wherein the OLED display panel comprises:

a plurality of light emitting elements, an image sensor, a light shading layer located between the image sensor and a layer where the light emitting elements are located and having at least one pinhole imaging area, and a strong reflection interface located at one side of the light emitting elements away from the light shading layer;

wherein;

the at least one pinhole imaging area is located at gaps among the light emitting elements;

the image sensor is configured, in a texture recognition period, to obtain an image of an object formed through the pinhole imaging area, the object being above the display panel;

wherein in the texture recognition period, a first light emitting element in a texture recognition area is in an off state, the first light emitting element comprises at least a light emitting element of which a spacing from an edge of the pinhole imaging area is closest in the texture recognition area;

wherein the first light emitting element comprises all light emitting elements of which spacings from the edge of the pinhole imaging area are smaller than a preset spacing in the texture recognition area;

the preset spacing is determined according to a distance between a strong reflection interface in the OLED display panel and an upper surface of a light shading layer having the pinhole imaging area, a distance between the strong reflection interface in the OLED display panel and an upper surface of the light emitting element, and a maximum angle at which the image sensor in the OLED display panel receives light.

14. The OLED display panel of claim 13, further comprising:

a touch module located at one side of the light emitting elements away from the light shading layer, wherein the touch module is served as the strong reflection interface.

15. The OLED display panel of claim 13, wherein the preset spacing L is determined by a following formula:

L=(x₁+x₂)*tan θ

wherein x₂ is the distance between the strong reflection interface in the OLED display panel and the upper surface of a light shading layer having the pinhole imaging area;

x₁ is the distance between the strong reflection interface in the OLED display panel and the upper surface of the light emitting element; and

θ

is the maximum angle at which the image sensor in the OLED display panel receives light.

16. The OLED display panel of claim 15, wherein the first light emitting element comprises two rings of light emitting elements of which the center is the pinhole imaging area in the texture recognition area.

17. A display device, comprising an Organic Light Emitting Diode (OLED) display panel, which is driven by the driving method of claim 1, wherein the OLED panel comprises:

a plurality of light emitting elements, an image sensor, a light shading layer located between the image sensor and a layer where the light emitting elements are located and having at least one pinhole imaging area, and a strong reflection interface located at one side of the light emitting elements away from the light shading layer;

wherein;

the at least one pinhole imaging area is located at gaps among the light emitting elements;

the image sensor is configured, in a texture recognition period, to obtain an image of an object formed through the pinhole imaging area, the object being above the display panel;

wherein in the texture recognition period, a first light emitting element in a texture recognition area is in an off state, the first light emitting element comprises at least a light emitting element of which a spacing from an edge of the pinhole imaging area is closest in the texture recognition area;

wherein the first light emitting element comprises all light emitting elements of which spacings from the edge of the pinhole imaging area are smaller than a preset spacing in the texture recognition area;

the preset spacing is determined according to a distance between a strong reflection interface in the OLED display panel and an upper surface of a light shading layer having the pinhole imaging area, a distance between the strong reflection interface in the OLED display panel and an upper surface of the light emitting element, and a maximum angle at which the image sensor in the OLED display panel receives light.

18. The display device of claim 17, wherein the OLED display panel further comprises:

a touch module located at one side of the light emitting elements away from the light shading layer, wherein the touch module is served as the strong reflection interface.

19. The display device of claim 17, wherein the preset spacing L is determined by a following formula:

L=(x₁+x₂)*tan θ

wherein x₂ is the distance between the strong reflection interface in the OLED display panel and the upper surface of a light shading layer having the pinhole imaging area;

x₁ is the distance between the strong reflection interface in the OLED display panel and the upper surface of the light emitting element; and

θ

is the maximum angle at which the image sensor in the OLED display panel receives light.

20. The display device of claim 19, wherein the first light emitting element comprises two rings of light emitting elements of which the center is the pinhole imaging area in the texture recognition area.