Pixel driving circuit, pixel driving method and liquid crystal display device

• US 10,636,380 B1
• Filed: 03/20/2018
• Issued: 04/28/2020
• Est. Priority Date: 02/28/2018
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Xu, Xiangyang
• Primary Examiner(s): Eurice, Michael J
• Application Number:
  US16/069,283
• Time in Patent Office: 770 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 2310/0202 Addressing of scan or signal lines
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/068 for control of viewing angle adjustment
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

Provided are a pixel driving circuit, a pixel driving method and a liquid crystal display device. Each pixel unit of the pixel driving circuit comprises a first sub pixel and a second sub pixel. A first sub pixel and a second sub pixel in a column of pixel units are respectively connected to one data line and one auxiliary line, and meanwhile, control units receiving the first and second control signals are arranged. Each control unit is coupled to an auxiliary line and a data line connected to a column of pixel units. The control unit is controlled by the first control signal and the second control signal to disconnect the data line from the auxiliary line and to connect the auxiliary line to the common electrode line, or to connect the data line to the auxiliary line and to disconnect the auxiliary line from the common electrode line.

Claims

1. A pixel driving circuit comprising:

a plurality columns of data lines, a plurality of rows of scan lines, a plurality of auxiliary lines, a plurality of pixel units arranged in an array;

a common electrode line and a plurality of control units;

wherein each pixel unit comprises a first sub pixel and a second sub-pixel;

each scan line is correspondingly connected to first sub pixels and second sub pixels in a row of pixel units;

first sub pixels of each column of pixel units are correspondingly connected to one data line and second sub pixels in each column of pixel units are correspondingly connected to one auxiliary line;

each control unit receives a first control signal and the second control signal, and is electrically connected to the common electrode line, and is correspondingly connected to an auxiliary line and a data line of one column of pixel units;

the common electrode line receives a common voltage;

the control unit is controlled by the first control signal and the second control signal to disconnect the corresponding data line from the corresponding auxiliary line and to connect the corresponding auxiliary line to the common electrode line, or to connect the corresponding data line to the corresponding auxiliary line and to disconnect the corresponding auxiliary line from the common electrode line;

the first sub pixel comprises a single domain structure, and the second sub pixel comprises a domain having a domain direction different from a domain direction of the first sub pixel.

2. The pixel driving circuit according to claim 1, wherein the first sub pixel comprises a first thin film transistor and a first pixel electrode;

a gate of the first thin film transistor is electrically coupled to a corresponding scan line, and a source of the first thin film transistor is electrically coupled to a corresponding data line, and a drain of the first thin film transistor is electrically coupled to the first pixel electrode;

the second sub pixel comprises a second thin film transistor and a second pixel electrode;

a gate of the second thin film transistor is electrically coupled to a corresponding scan line, and a source of the second thin film transistor is electrically coupled to a corresponding auxiliary line, and a drain of the second thin film transistor is electrically coupled to the second pixel electrode;

the first pixel electrode comprises a single domain structure, and the second pixel electrode comprises a domain having a domain direction different from a domain direction of the first pixel electrode.

3. The pixel driving circuit according to claim 1, wherein the second sub pixel is a multi domain structure;

or the second sub pixel is a single domain structure having a domain direction different from a domain direction of the first sub pixel.

4. The pixel driving circuit according to claim 1, further comprising a gate driver and a source driver, wherein a plurality of data lines is coupled to the source driver, and a plurality of scan lines is coupled to the gate driver.

5. A pixel driving method, applied to the pixel driving circuit according to claim 1, comprising steps of:

controlling the control unit by a first control signal and a second control signal to disconnect the corresponding data line from the corresponding auxiliary line and to connect the corresponding auxiliary line to the common electrode line;

controlling the control unit by the first control signal and the second control signal to connect the corresponding data line to the corresponding auxiliary line and to disconnect the corresponding auxiliary line from the common electrode line.

6. A liquid crystal display device, comprising the pixel driving circuit according to claim 1.

7. The pixel driving circuit according to claim 1, wherein the control unit comprises a third thin film transistor and a fourth thin film transistor;

a gate of the third thin film transistor receives a first control signal, and a source of the third thin film transistor is electrically coupled to a corresponding data line, and a drain of the third thin film transistor is electrically coupled to a corresponding auxiliary line;

a gate of the fourth thin film transistor receives a second control signal, and a source of the fourth thin film transistor is electrically coupled to the common electrode line, and a drain of the fourth thin film transistor is electrically coupled to a corresponding auxiliary line.

8. The pixel driving circuit according to claim 7, wherein both the third thin film transistor and the fourth thin film transistor are P type thin film transistors or N type thin film transistors, and the first control signal and the second control signal have opposite potentials.