Display unit, pixel circuit and driving method and display panel thereof

Patent metadata

Field	Value
Publication number	US-10643526-B2
Application number	US-201715767281-A
Country	US
Kind code	B2
Filing date	Oct 13, 2017
Priority date	Mar 31, 2017
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

The embodiments of the disclosure relate to a display unit, a pixel circuit and a driving method and a display panel thereof. The display unit comprises a display pixel unit for displaying images, and an imaging pixel unit for acquiring images. The imaging pixel unit comprises a photosensitive element and a filter element located on the photosensitive element.

First claim

What is claimed is:

1. A pixel circuit, comprising:
a display unit comprising:
a display pixel for displaying images; and
an imaging pixel for acquiring images, the imaging pixel comprising a photosensitive sensor and a filter located on the photosensitive sensor, the photosensitive sensor configured to sense brightness of an external image and convert the brightness into an electric signal when acquiring the images, the filter comprising an electrochromic filter or a liquid crystal filter;
wherein the electrochromic filter comprises:
a first substrate;
a second substrate disposed opposite to the first substrate,
a common electrode disposed between the first substrate and the second substrate;
a first electrode, a second electrode and a third electrode located between the common electrode and the second substrate, the first electrode the second electrode and the third electrode located in the same layer; and
a first electrochromic material located between the common electrode and the first electrode as a first color filter through which a first color light transmits, a second electrochromic material located between the common electrode and the second electrode as a second color filter through which a second color light transmits, and a third electrochromic material located between the common electrode and the third electrode as a third color filter through which a third color light transmits;

a storage capacitor;
a data write circuit configured to control a data voltage to be written into a first terminal of the storage capacitor;
a display control circuit configured to control the display pixel in the display unit to display images; and
an imaging control circuit configured to control the imaging pixel in the display unit to acquire images,
wherein the imaging control circuit comprises a first transistor, a second transistor and a third transistor having a control electrode coupled to the scan line, a first electrode coupled to the imaging pixel, and a second electrode coupled to an imaging signal output terminal, wherein the second transistor and the first transistor are of the same type, and wherein the third transistor and the first transistor are of different types.

2. The pixel circuit according to claim 1 , wherein the data write circuit includes a first transistor having a control electrode coupled to a scan line, a first electrode coupled to a data line, and a second electrode coupled to the first terminal of the storage capacitor.

3. The pixel circuit according to claim 2 , wherein the display control circuit includes a second transistor having a control electrode coupled to a second terminal of the storage capacitor, a first electrode coupled to the display pixel, and a second electrode configured to receive a power supply voltage.

4. A display panel, comprising a plurality of pixel circuits including the pixel circuit according to claim 3 , wherein imaging pixels of the plurality of pixel circuits are located between display pixels.

5. A display panel, comprising a plurality of pixel circuits including the pixel circuit according to claim 2 , wherein imaging pixels of the plurality of pixel circuits are located between display pixels.

6. A method for driving the pixel circuit according to claim 1 , comprising:
in a first period of time, driving the display control circuit to display images; and
in a second period of time, driving the imaging control circuit to acquire images.

7. A display panel, comprising a plurality of pixel circuits including the pixel circuit according to claim 1 , wherein imaging pixels of the plurality of pixel circuits are located between display pixels.

8. A pixel circuit, comprising:
a display unit comprising
a display pixel for displaying images; and
an imaging pixel for acquiring images, the imaging pixel comprising a photosensitive sensor and a filter located on the photosensitive sensor, the photosensitive sensor configured to sense brightness of an external image and convert the brightness into an electric signal when acquiring the images. the filter comprising an electrochromic filter or a liquid crystal filter;
wherein the electrochromic filter comprises:
a first substrate;
a second substrate disposed opposite to the first substrate;
a common electrode disposed between the first substrate and the second substrate;
a first electrode, a second electrode and a third electrode located between the common electrode and the second substrate, the first electrode, the second electrode and the third electrode located in the same layer; and

a first electrochromic material located between the common electrode and the first electrode as a first color filter through which a first color light transmits, a second electrochromic material located between the common electrode and the second electrode as a second color filter through which a second color light transmits, and a third electrochromic material located between the common electrode and the third electrode as a third color filter through which a third color light transmits;
a storage capacitor;
a first transistor;
a second transistor; and
a third transistor, wherein:
a control electrode of the first transistor is coupled to a scan line, a first electrode of the first transistor is coupled to a data line, a second electrode of the first transistor is coupled to a first terminal of the storage capacitor;
a control electrode of the second transistor is coupled to a second terminal of the storage capacitor, a first electrode of the second transistor is coupled to the display pixel of the display unit, and a second electrode of the second transistor is configured to receive a power supply voltage;
a control electrode of the third transistor is coupled to the scan line, a first electrode of the third transistor is coupled to the imaging pixel in the display unit, and a second electrode of the third transistor is coupled to an imaging signal output terminal; and
the second transistor and the first transistor are of the same type, and the third transistor and the first transistor are of different types.

9. A method for driving the pixel circuit according to claim 8 , comprising:
in a first period of time, inputting a first voltage signal into the scan line to turn on the first transistor and turn off the third transistor, and inputting a data signal into the data line to charge the storage capacitor to turn on the second transistor to drive the display pixel to emit a light; and
in a second period of time, inputting a first voltage signal into the scan line to turn on the third transistor and turn off the first and second transistors so as to output an image signal acquired by the imaging pixel from the imaging signal output terminal.

10. The method according to claim 9 , wherein in the second period of time, the imaging pixel asynchronously acquires a first image signal of a first color, a second image signal of a second color, and a third image signal of a third color.

11. A display panel, comprising a plurality of pixel circuits including the pixel circuit according to claim 8 , wherein imaging pixels of the plurality of pixel circuits are located between display pixels.

Assignees

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

Inventors

• Wang Yanfeng
• L V Zhenhua
• Wang Zhidong
• Xu Xiaoling
• Du Yuanxin
• Zhang Hongshu
• Hu Weipin
• Wei Congcong

Classifications

• G09G2360/14

  Detecting light within display terminals, e.g. using a single or a plurality of photosensors · CPC title

• G09G2360/142

  the light being detected by light detection means within each pixel · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G09G3/3688

  suitable for active matrices only · CPC title

• G09G2310/0275

  Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current · CPC title