Pixel driving circuit, display panel having the pixel driving circuit and driving method of display panel

Patent metadata

Field	Value
Publication number	US-10971100-B2
Application number	US-201916536834-A
Country	US
Kind code	B2
Filing date	Aug 9, 2019
Priority date	Sep 20, 2018
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

The present disclosure provides a driving method of a display panel, the display panel including a plurality of pixels, each row of pixels correspond to a gate line, each column of pixels correspond to a data line, the driving method including: comparing a current frame of image with a previous frame of image to determine a non-changing row of the pixels, contents displayed by each pixel in the non-changing row for the current frame of image and contents displayed by each pixel in the non-changing row for the previous frame of image are the same; selecting a non-charging row from the non-changing row according to a predetermined time; providing, when displaying the current frame of image, an invalid signal to the gate line of the non-charging row during a scanning time for the gate line of the non-charging row to not to charge the non-charging row.

First claim

What is claimed is:

1. A driving method of a display panel, the display panel comprising a plurality of pixels arranged in an array, wherein each row of pixels corresponds to a gate line, and each column of pixels corresponds to a data line, the method comprising:
comparing a current frame of image with a previous frame of image to determine a non-changing row in a pixel array, wherein contents displayed by pixels in the non-changing row for the current frame of image and contents displayed by pixels in the non-changing row for the previous frame of image are the same;
selecting a non-charging row from the non-changing row according to a predetermined time;
providing, when displaying the current frame of image, an invalid signal to the gate line of the non-charging row during a scanning time for the gate line of the non-charging row to not charge the non-charging row,
wherein selecting the non-charging row from the non-changing row according to the predetermined time comprises:
determining whether a time period of the non-changing row from a time when the current frame of image begins to be displayed to a time when a previous charging for the non-changing row is finished reaches a predetermined time, and in response to a negative determination, determining the non-changing row as a non-charging row, and in response to an affirmative determination, determining the non-changing row not as a non-charging row;
wherein the display panel further comprises: a gate line driving circuit for driving each gate line, a data line driving circuit for driving each data line, a timing controller for providing control signals to the gate line driving circuit and the data line driving circuit,
wherein, providing, when displaying the current frame of image, an invalid signal to the gate line of the non-charging row during the scanning time for the gate line of the non-charging row to not charge the non-charging row further comprises:
providing, when displaying the current frame of image, an invalid control signal to the gate line driving circuit and the data line driving circuit through the timing controller during the scanning time for the gate line of the non-charging row, to control the gate line driving circuit to provide an invalid signal to the gate line of the non-charging row and to control the data line driving circuit not to provide a signal to each data line,
wherein the timing controller is configured to generate a control signal based on an input signal at an input terminal thereof, and when an invalid input signal is received by the input terminal of the timing controller, an invalid control signal is output by the timing controller, and when a valid input signal is received by the input terminal of the timing controller, a valid control signal is output by the timing controller,
the display panel further comprises a first control circuit, a second control circuit and an AND gate circuit, a first input terminal of the AND gate circuit is coupled to an output terminal of the first control circuit, and a second input terminal of the AND gate circuit is coupled to an output terminal of the second control circuit, and an output terminal of the AND gate circuit is coupled to the input terminal of the timing controller, wherein the first control circuit is configured to output an original signal to the first terminal of the AND gate circuit, and the second control circuit is configured to generate an additional control signal based on the non-charging row for the current frame of image and output the additional control signal to the second input terminal of the AND gate circuit, and the AND gate circuit is configured to output a signal generated by the AND operation on the original signal and the additional control signal to the timing controller,
wherein, determining whether a time period of the non-changing row from a time when the current frame of image begins to be displayed to a time when a previous charging for the non-changing row is finished reaches a predetermined time, and in response to a negative determination, determining the non-changing row as a non-charging row, and in response to an affirmative determination, determining the non-changing row not as a non-charging row further comprises:
controlling, when displaying the current frame of image, the additional control signal to be invalid during the scanning time for the gate line of the non-charging row, and the additional control signal to be valid during the scanning time for the gate line of any row other than non-charging row in the pixel array.

2. The driving method of claim 1 , wherein the predetermined time is a difference between a maximum time that a pixel can keep displaying normally after being charged once and a time for displaying a frame of image.

3. The driving method of claim 1 , wherein, when the current frame of image is displayed, no signal is provided to each data line during a scanning time for the gate line of the non-charging row.

4. The driving method of claim 1 , wherein comparing the current frame of image with a previous frame of image to determine the non-changing row in the pixel array comprises: determining the non-changing row according to an interframe difference method.

5. The driving method of claim 4 , wherein determining the non-changing row according to the interframe difference method comprises:
extracting a pixel by which contents displayed for the current frame of image being different from contents displayed for the previous frame of image, and locating a row having the pixel in the pixel array, and determining other rows in the pixel array as non-changing rows.

6. The driving method of claim 1 , wherein after selecting a non-charging row from the non-changing row according to a predetermined time, the driving method further comprises:
recording, a sum of a time period of the non-charging row from the current frame of image begins to be displayed to a time when a previous charging for the non-charging row is finished and a displaying time of a frame of image.

7. A pixel driving circuit, comprising a timing controller, a gate line driving circuit, and a data line driving circuit, wherein output terminals of the timing controller are coupled to the gate line driving circuit and the data line driving circuit respectively to provide control signals to the gate line driving circuit and the data line driving circuit respectively, and the pixel driving circuit further comprises:
an AND gate circuit having an output terminal coupled to an input terminal of the timing controller;
a first control circuit having an output terminal coupled to a first input terminal of the AND gate circuit and configured to output an original signal to the first input terminal of the AND gate circuit;
a second control circuit having an output terminal coupled to a second input terminal of the AND gate circuit and configured to select a non-charging row from non-changing rows according to a predetermined time to generate an additional control signal and output the additional control signal to the second input terminal of the, wherein the non-changing row is a row that all the pixels therein display a same content in a current frame of image and a previous frame of image, the non-charging row is a row within the non-changing rows of which a time period from a time when the current frame of image begins to be displayed to a time when the previous charging for the row is finished reaches a predetermined time,
wherein the AND gate circuit is further configured to output a signal generated by an AND operation on the original signal and the additional control signal to the timing controller, and
wherein the gate line driving circuit is configured to provide, when displaying the current frame of image, an invalid sig

Assignees

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

Inventors

• Zhang Ying
• Lei Sijun
• Lu Xu
• Gao Xianyong
• Xiao Shoujun
• Huangfu Yifan
• Xu Zhicai
• Ran Bo
• Ge Yongli

Classifications

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2310/04

  Partial updating of the display screen · CPC title

• G09G2330/023

  using energy recovery or conservation · CPC title

• G09G2320/10

  Special adaptations of display systems for operation with variable images · CPC title

• G09G2310/0213

  controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power · CPC title