# US 10,481,721 B2 · Display substrate having touch function, method for driving the same and display apparatus

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- Number: US 10,481,721 B2
- Document ID: US10481721B2
- Status: Granted
- Kind: B2
- Application number: 15/037,899
- Filed: 2015-12-15
- Published: 2017-04-20
- Granted: 2019-11-19
- Earliest claimed: 2015-03-19
- Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Optoelectronics Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Optoelectronics Technology Co., Ltd.
- Inventors: Xiaoliang Ding; Haisheng Wang; Yingming Liu; Weijie Zhao; Tao Ren
- Web page: https://patentgrep.com/patent/US10481721B2

## CPC

- G06F 3/044: by capacitive means
- G02F 1/13338: {Input devices, e.g. touch panels}
- G02F 1/136286: {Wiring, e.g. gate line, drain line}
- G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- 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)}
- G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally}
- G06F 3/0443: {using a single layer of sensing electrodes}
- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G09G 3/36: using liquid crystals
- 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)}
- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G02F 2201/123: pixel
- G06F 2203/04107: Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
- G09G 2310/061: for resetting or blanking
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## 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 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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.

### Claim 5 (depends on 3)

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.

### Claim 6 (depends on 3)

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.

### Claim 7 (depends on 1)

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.

### Claim 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.

### Claim 9 (depends on 8)

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.

### Claim 10 (depends on 9)

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.

### Claim 11 (depends on 8)

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

### Claim 12 (depends on 11)

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.

### Claim 13 (depends on 2)

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.

### Claim 14 (depends on 11)

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.

### Claim 15 (depends on 14)

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.

### Claim 16 (depends on 1)

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.