Touch display and method for driving touch display

• US 8,970,548 B2
• Filed: 03/13/2013
• Issued: 03/03/2015
• Est. Priority Date: 05/14/2012
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Tun, Kyaw Kyaw, Wang, Chao-Chen, Chen, Chi-Cheng
• Primary Examiner(s): Edun, Muhammad N
• Application Number:
  US13/802,611
• Publication Number:
  US 20130300706A1
• Time in Patent Office: 720 Days
• Field of Search: None
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A touch display includes a display panel, a plurality of sensing electrodes and a driving circuit module. The display panel includes a plurality of pixels. The plurality of sensing electrodes are stacked with the display panel and are used for detecting a touch input and generating a sensing signal in response to the touch input. The driving circuit module is electrically coupled to the display panel and the plurality of sensing electrodes, for controlling the pixels of the display panel according to an image data, and generating a touch signal for indicating whether the touch display is touched or not in response to the image data and the sensing signal.

Claims

1. A touch display comprising:

a display panel including a plurality of pixels;

a plurality of sensing electrodes stacked with the display panel for detecting a touch input and generating a sensing signal in response to the touch input; and

a driving circuit module electrically coupled to the display panel and the plurality of sensing electrodes, for controlling the pixels of the display panel according to an image data, and generating a touch signal for indicating whether the touch display is touched or not by calculating based on a value of the sensing signal and the image data.

2. The touch display of claim 1, wherein the display panel comprises:

a liquid crystal layer, a common electrode and a plurality of pixel electrodes, the common electrode and the plurality of pixel electrodes being configured to control the liquid crystal layer;

the plurality of sensing electrodes comprising;

a plurality of first electrodes arranged along a first axis for outputting the sensing signal; and

a plurality of second electrodes arranged along a second axis for receiving plural sets of driving pulses sequentially;

the touch display further comprising a signal receiving unit for receiving the image data; and

the driving circuit module further electrically coupling to the signal receiving unit, the first electrodes and the second electrodes, and being further configured to provide the second electrodes with the plural sets of driving pulses sequentially and receive the sensing signal from the first electrodes.

3. The touch display of claim 2, wherein the driving circuit module comprises:

a first driving circuit coupled to the display panel, the signal receiving unit and the second electrodes, for controlling voltage differences between each pixel electrode and the common electrode according to the image data so as to control grey levels of the pixels, and to sequentially provide the plural sets of driving pulses for the second electrodes; and

a second driving circuit coupled to the signal receiving unit and the first electrodes, for receiving the sensing signal from the first electrodes, receiving the image data from the signal receiving unit, and generating the touch signal according to the sensing signal and the image data.

4. The touch display of claim 2, wherein the driving circuit module comprises:

a first driving circuit coupled to the display panel, the signal receiving unit and the second electrodes, for controlling voltage differences between each pixel electrode and the common electrode according to the image data so as to control grey levels of the pixels, and to sequentially provide the plural sets of driving pulses for the second electrodes; and

a second driving circuit coupled to the signal receiving unit and the first electrodes, for receiving the sensing signal from the first electrodes, receiving an adjusting signal corresponding to the image data with the first driving circuit, and generating the touch signal according to the sensing signal and the adjusting signal.

5. The touch display of claim 2, wherein the driving circuit module comprises:

a first driving circuit coupled to the signal receiving unit, for controlling voltage differences between each pixel electrode and the common electrode according to the image data received by the signal receiving unit so as to control grey levels of the pixels; and

a second driving circuit coupled to the signal receiving unit, the first electrodes and the second electrodes, for receiving the image data, providing the plural sets of driving pulses for the second electrodes, receiving the sensing signal with the first electrode, and generating the touch signal according to the sensing signal and the image data.

6. The touch display of claim 2, wherein the driving circuit module comprises:

a first driving circuit coupled to the signal receiving unit, for controlling voltage differences between each pixel electrode and the common electrode according to the image data received by the signal receiving unit so as to control grey levels of the pixels; and

a second driving circuit coupled to the signal receiving unit, the first electrodes and the second electrodes, for receiving an adjustment signal corresponding to the image data from the first driving circuit, providing the plural sets of driving pulses for the second electrodes, receiving the sensing signal from the first electrodes, and generating the touch signal according to the sensing signal and the adjustment signal.

7. The touch display of claim 2, wherein the first electrodes and the second electrodes are configured at a same side of the liquid crystal layer.

8. The touch display of claim 2, wherein the first electrodes and the second electrodes are set at different sides of the liquid crystal layer.

9. The touch display of claim 2, wherein the driving circuit module further comprises a filter for filtering the touch signal to generate a modified touch signal.

10. The touch display of claim 2, wherein the driving circuit module further comprises a filter for filtering the touch signal to generate a modified touch signal.

11. The touch display of claim 2, wherein:

the touch display further comprises a backlight module for generating backlight for the display panel;

the display panel is disposed at a side of the backlight module and the display panel comprises;

a first polarization layer, disposed at a side of the backlight module;

a substrate, disposed at a side of the first polarization layer opposite to the backlight module, having multiple thin film transistors, wherein the thin film transistors and the pixel electrodes are disposed on the surface of the substrate, and each thin film transistor is individually electrically coupled to one of the pixel electrodes;

a color filter, disposed at a side of the substrate opposite to the liquid crystal layer, wherein the common electrode are formed on a surface of the color filter facing toward the liquid crystal layer;

a glass layer, disposed on a side of the color filter opposite to the common electrode;

a sensing electrode layer comprising the plurality of first electrodes arranged along the first axis and the plurality of second electrodes arranged along the second axis;

a second polarization layer is disposed at a side of the sensing electrode layer opposite to the glass layer;

a protection layer, disposed on a side of the second polarization layer opposite to the sensing electrode layer.

12. The touch display of claim 11, wherein the sensing electrode layer is disposed between the glass layer and the second polarization layer.

13. The touch display of claim 11, wherein the sensing electrode layer is disposed between the color filter layer and the glass layer.

14. The touch display of claim 1, wherein the touch signal comprises a plurality of sub-touch signals, each sub-touch signal is for indicating a touch status of a corresponding sensing point at the display panel in response to the touch input, and each sub-touch signal is generated according to gray levels of a portion of the pixels near the corresponding sensing point and the sensing signal.

15. A touch display comprising:

a display panel including a plurality of pixels;

a plurality of sensing electrodes stacked with the display panel for detecting a touch input and generating a sensing signal in response to the touch input; and

a driving circuit module electrically coupled to the display panel and the plurality of sensing electrodes, for controlling the pixels of the display panel, and generating a touch signal for indicating whether the touch display is touched or not by calculating based on capacitances of a liquid crystal layer of a portion or all of the pixels and a value of the sensing signal.

16. A method for driving a touch display, the touch display comprising a display panel, a plurality of first electrodes and a plurality of second electrodes, the display panel comprising a plurality of pixels, the method comprising:

receiving an image data;

controlling gray levels of the pixels of the touch display according to the image data;

receiving a sensing signal in response a touch input from the first electrodes; and

generating a touch signal for indicating whether the touch display is touched or not by calculating based on a value of the sensing signal and the image data.

17. The method of claim 16, wherein:

the display panel further comprises a liquid crystal layer, a common electrode and a plurality of pixel electrodes, and the common electrode and the pixel electrodes are configured to control the liquid crystal layer; and

controlling the gray levels of the pixels of the touch display according to the image data comprises controlling voltage differences between each pixel electrode and the common electrode according to the image data.

18. The method of claim 16, wherein:

the touch display comprises a liquid crystal layer and a plurality of pixel electrodes, and the second electrodes are further used with the pixel electrodes to control the liquid crystal layer; and

controlling the gray levels of the pixels of the touch display according to the image data comprises controlling voltage differences between each pixel electrode and the second electrodes according to the image data.

19. The method of claim 16, wherein generating the touch signal according to the sensing signal and the image data comprises:

providing a plurality of sub-sensing values according to the sensing signal, wherein the sub-sensing values correspond to a plurality of sensing points is generated by the first electrodes and the second electrodes;

generating a plurality of correction values corresponding to each of the sensing points, wherein each of the correction values is generated according to the image data of at least one pixel corresponding to the sensing point; and

generating the touch signal according to the sub-sensing values and the correction values.

20. The method of claim 16, wherein generating the touch signal according to the sensing signal and the image data comprises calculating subtraction values between the sub-sensing values and the correction values corresponding to the sub-sensing values to generate the touch signal.