Display substrate having touch function, method for driving the same and display apparatus

• US 10,481,721 B2
• Filed: 12/15/2015
• Issued: 11/19/2019
• Est. Priority Date: 03/19/2015
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Ding, Xiaoliang, Wang, Haisheng, Liu, Yingming, Zhao, Weijie, Ren, Tao
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): Teshome, Kebede T
• Application Number:
  US15/037,899
• Publication Number:
  US 20170108976A1
• Time in Patent Office: 1,435 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/36 using liquid crystals
• 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

Abstract

The present disclosure provides in some embodiments a display substrate having a touch function, a method for driving the display substrate and a display apparatus. The method includes steps of: dividing touch driving electrodes included in the display substrate and parallel to gate lines into N portions, wherein each portion of the touch driving electrodes is arranged in a direction perpendicular to the gate lines, and N is a positive integer greater than or equal to 2; and resetting pixels corresponding to an n^th portion of the touch driving electrodes before a touch driving for the n^th portion is started, so that the pixels have a same grey scale value, wherein n is a positive integer greater than or equal to 1 and less than or equal to N.

Claims

1. A method for driving a display substrate having a touch function, comprising steps of:

dividing touch driving electrodes comprised in the display substrate and parallel to gate lines into N portions, wherein each portion of the touch driving electrodes is arranged in a direction perpendicular to the gate lines, and N is a positive integer greater than or equal to 2; and

resetting pixels corresponding to an nth portion of the touch driving electrodes before a touch driving for the nth portion is started, so that the pixels have a same grey scale value, wherein

n is a positive integer greater than or equal to 1 and less than or equal to N;

a touch driving time period for the nth portion of the touch driving electrodes that is close to touch sensing electrodes, and merely the pixels corresponding to the nth portion are reset, wherein the touch driving time period for the nth portion of the touch driving electrodes occurs within a time period of a display scanning time period for at least another portion of the touch driving electrodes; and

the touch driving time period for each portion of the touch driving electrodes occurs prior to the display scan time period for each portion of the touch driving electrodes.

2. The method according to claim 1, wherein

a display scanning time period for the nth portion coincides with a touch driving time period for an (n+1)th portion of the touch driving electrodes;

and

a display scanning time period for the Nth portion of the touch driving electrodes coincides with a touch driving time period for a first portion of the touch driving electrodes.

3. The method according to claim 1, wherein the step of resetting the pixels corresponding to the nth portion of the touch driving electrode comprises steps of:

enabling the gate lines for controlling the pixels corresponding to the nth portion; and

supplying a same voltage to the pixels corresponding to the nth portion.

4. The method according to claim 3, wherein the step of enabling the gate lines for controlling the pixels corresponding to the nth portion comprises a step of:

inputting a reset enabling signal for enabling the gate lines for controlling the pixels corresponding to the nth portion.

5. The method according to claim 3, wherein the same voltage is of a value determined by experiments to have a minimal impact on a display effect of a display apparatus comprising the display substrate.

6. The method according to claim 3, wherein the same voltage is of a value to enable the same grey scale value of the pixels corresponding to the nth portion to be 0.

7. The method according to claim 1, wherein

during the touch driving time period for the nth portion, a touch driving signal is applied to the nth portion of the touch driving electrodes;

and

during the display scanning time period for the nth portion, a common electrode signal is applied to the nth portion of the touch driving electrodes.

13. The method according to claim 2, wherein the step of resetting the pixels corresponding to the nth portion of the touch driving electrode comprises steps of:

enabling the gate lines for controlling the pixels corresponding to the nth portion; and

supplying a same voltage to the pixels corresponding to the nth portion.

16. The method of claim 1 wherein the nth portion is a portion of the touch driving electrodes that is close to touch sensing electrodes, and merely the pixels corresponding to the nth portion are reset.

8. A display substrate having a touch function, comprising a plurality of touch driving electrodes extending in a direction parallel to gate lines, wherein

the touch driving electrodes are divided into N portions, each portion of the touch driving electrodes is arranged in a direction perpendicular to the gate lines, and each portion of the touch driving electrodes is connected to a driving line, wherein N is a positive integer greater than or equal to 2;

and

pixels corresponding to an nth portion of the touch driving electrodes are capable of being reset to have a same grey scale value before a touch driving for the nth portion is started, so that liquid crystal molecules corresponding to the nth portion have a same deflection state, wherein

n is a positive integer greater than or equal to 1 and less than or equal to N;

during a touch driving time period for the nth portion, the nth portion of the touch driving electrodes is applied with a touch driving signal; and

during a display scanning time period for the nth portion, the nth portion of the touch driving electrodes is applied with a common electrode signal, the nth portion is a portion of the touch driving electrodes that is close to touch sensing electrodes, and merely the pixels corresponding to the nth portion are reset, wherein the touch driving time period for the nth portion of the touch driving electrodes occurs within a time period of the display scanning time period for at least another portion of the touch driving electrodes; and

the touch driving time period for each portion of the touch driving electrodes occurs prior to the display scan time period for each portion of the touch driving electrodes.

9. The display substrate according to claim 8, further comprising the gate lines, data lines, thin film transistors (TFTs) and pixel electrodes, wherein the pixel electrodes comprise slits or are strip-shaped electrodes, and the touch driving electrodes are arranged above and insulated from the pixel electrodes.

10. The display substrate according to claim 9, further comprising shielding structures arranged above the data lines and arranged on a same layer as the pixel electrodes.

11. The touch display apparatus comprising the display substrate according to claim 8.

12. The touch display apparatus according to claim 11, further comprising a reset-enabling-signal input module for inputting a reset enabling signal to the nth portion before the touch driving for the nth portion is started, wherein the reset enabling signal enables the pixels corresponding to the nth portion to be reset to have the same grey scale value, wherein n is a positive integer greater than or equal to 1 and less than or equal to N.

14. The touch display apparatus according to claim 11, further comprising the gate lines, data lines, thin film transistors (TFTs) and pixel electrodes, wherein the pixel electrodes comprise slits or are strip-shaped electrodes, and the touch driving electrodes are arranged above and insulated from the pixel electrodes.

15. The touch display apparatus according to claim 14, further comprising shielding structures arranged above the data lines and arranged on a same layer as the pixel electrodes.