Display panel, electronic apparatus having the same, and driving method thereof

Patent metadata

Field	Value
Publication number	US-9892303-B2
Application number	US-201615501855-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	Aug 28, 2015
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

A display panel having a plurality of pixels, each of which includes a subpixel region and an inter-subpixel region. The display panel includes a light filtering layer forming a light filtering region within the inter-subpixel region, the light filtering layer comprising a light filtering material at least partially transmissive for a light of a selected wavelength; and a photosensor in the light filtering region for detecting the light of the selected wavelength, the photosensor being sensitive to the light of the selected wavelength.

First claim

What is claimed is:

1. A display panel having a plurality of pixels, each of which includes a subpixel region and an inter-subpixel region, the display panel comprising:
a light filtering layer forming a light filtering region within the inter-subpixel region, the light filtering layer comprising a light filtering material at least partially transmissive for a light of a selected wavelength;
a photosensor in the light filtering region for detecting the light of the selected wavelength, the photosensor being sensitive to the light of the selected wavelength; and
a thin film transistor coupled to the photosensor for receiving a current from the photosensor;
wherein the photosensor comprises:
a transparent electrode layer proximal to a light emitting surface of the display panel;
a photoelectric conversion layer on a side of the transparent electrode layer distal to the light emitting surface of the display panel, wherein a resistance of the photoelectric conversion layer undergoes a change when the photoelectric conversion layer is irradiated by the light of the selected wavelength; and
a non-transparent electrode layer on a side of the photoelectric conversion layer distal to the transparent electrode layer.

2. The display panel of claim 1 , wherein the light filtering material is a visible light blocking material.

3. The display panel of claim 1 , wherein the light filtering layer is made of a light filtering material comprising germanium or germanium oxide.

4. The display panel of claim 1 , wherein the selected wavelength is outside the range of visible light wavelengths.

5. The display panel of claim 1 , wherein the light of the selected wavelength is an infrared light.

6. The display panel of claim 1 , wherein the light of the selected wavelength is an ultraviolet light.

7. The display panel of claim 1 , wherein the thin film transistor is in the light filtering region.

8. The display panel of claim 1 , each pixel comprises at least one photosensor and at least one thin film transistor coupled to the at least one photosensor.

9. The display panel of claim 1 , each pixel comprises a plurality of subpixels, each of the plurality of subpixels comprises at least one photosensor and at least one thin film transistor coupled to the at least one photosensor.

10. The display panel of claim 1 , wherein the thin film transistor comprises a gate node, a first node, and a second node; the non-transparent electrode layer is in a same layer as, and electrically isolated from, the gate node; and the photoelectric conversion layer is in a same layer as, and electrically connected to, the second node.

11. The display panel of claim 1 , wherein the photoelectric conversion layer is made of a material selected from the group consisting of lead sulfate, indium tin zinc oxide, and indium gallium zinc oxide.

12. The display panel of claim 1 , further comprising a control module coupled to the photosensor and the thin film transistor;
wherein the thin film transistor comprises a gate node, a first node, and a second node;
the gate node of the thin film transistor is connected to an output terminal of the control module for receiving scan signals from the control module;
the second node of the thin film transistor is connected to the photoelectric conversion layer for receiving the current of the photosensor,
the first node of the thin film transistor is connected to an input terminal of the control module for transmitting a current signal to the control module;
the transparent electrode layer of the photosensor is connected to the control module for receiving a first voltage signal from the control module; and
the non-transparent electrode layer of the photosensor is connected to the control module for receiving a second voltage signal from the control module, the second voltage signal being different from the first voltage signal.

13. The display panel of claim 12 , wherein the control module comprises a comparator for comparing the current signal received from the first node of the thin film transistor with a control value; the control module determines the current signal to be a signal associated with a ridge line of a fingerprint or a palmprint when a difference between the current signal and the control value is larger than a threshold value.

14. The display panel of claim 12 , further comprising a readline connecting the first node of the thin film transistor and the control module for transmitting the current signal to the control module.

15. The display panel of claim 1 , further comprising a light guide in the light filtering region on a side of the light filtering layer distal to the photosensor, the light guide being capable of reflecting the light of the selected wavelength by total reflection.

16. A method for driving a display panel of claim 1 , comprising:
providing a voltage signal to the photosensor in the light filtering region;
providing a scan signal to a gate electrode of the thin film transistor;
receiving a current signal from a first node of the thin film transistor;
comparing the current signal received from the first node of the thin film transistor with a control value; and
determining the current signal to be a signal associated with a ridge line of a fingerprint or a palmprint when a difference between the current signal and the control value is larger than a threshold value.

17. The method of claim 16 , wherein the step of providing the voltage signal to the photosensor in the light filtering region comprises providing a first voltage signal to a transparent electrode layer of the photosensor, and providing a second voltage signal to a non-transparent electrode layer of the photosensor, the second voltage signal being different from the first voltage signal.

18. The method of claim 17 , wherein the step of receiving the current signal from the first node of the thin film transistor comprises receiving the current signal from the first node of the thin film transistor through a readline connecting the first node and the control module.

19. An electronic apparatus comprising a display panel of claim 1 .

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics Tech Co Ltd

Inventors

• Li Changfeng
• Dong Xue
• Chen Xiaochuan
• Wang Haisheng
• Liu Yingming
• Wang Lei

Classifications

• G06V40/1318 Primary

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title

• G09G5/10

  Intensity circuits · CPC title

• G06K9/00013 Primary

  Physics · mapped topic

• G06K9/0008

  Physics · mapped topic

• G06V40/1359

  Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop · CPC title