METHOD AND SYSTEM OF DETECTING TOUCH OPERATION ON TOUCH SCREEN, AND TOUCH DISPLAY DEVICE

• US 20160246429A1
• Filed: 08/25/2014
• Published: 08/25/2016
• Est. Priority Date: 03/31/2014
• Status: Abandoned Application

• Current Assignee: BOE Technology Group Co., Ltd., Hefei Xinsheng Optoelectric Technology Co. Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Hefei Xin Sheng Photoelectric Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: MA, Tao, LI, Hengbin
• Application Number:
  US14/437,116
• Publication Number:
  US 20160246429A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

The present invention discloses a detection method and system for detecting whether or not a touch screen is touched, and a touch display device, for precisely detecting whether or not the touch screen is touched. The method comprises: controlling the touch screen to output a frame image, using pre-established correspondences between each gray scale and the correction data for the gray scale to convert gray scale of each sub-pixel region in the image into correction data for the gray scale, and using the obtained correction data to constitute a correction data table, the correction data table comprising correspondences between each sub-pixel region in the image and correction data; outputting a touch scan signal to a touch drive electrode line, and receiving a voltage signal outputted from a touch sensing electrode line, determining the sub-pixel region corresponding to the position coordinates, determining the correction data corresponding to the sub-pixel region through lookup in the correction data table, using the correction data to correct voltage waveform data corresponding to the voltage signal, and judging whether or not the touch screen is touched based on the corrected voltage waveform data.

Claims

1. A method for detecting a touch operation on a touch screen, wherein the method comprises:

controlling the touch screen to output a frame image, using pre-established correspondences between each gray scale and correction data for the gray scale to convert the gray scale of each sub-pixel region in the image into the correction data for the gray scale, and using the obtained correction data to constitute a correction data table, the correction data table comprising correspondences between each sub-pixel region in the image and the correction data;

outputting a touch scan signal to a touch drive electrode line, and receiving a voltage signal outputted from a touch sensing electrode line coupling with the touch scan signal on the touch drive electrode line, the voltage signal being used to determine position coordinates of a possible touch position on the touch screen; and

determining the sub-pixel region corresponding to the position coordinates, determining the correction data corresponding to the sub-pixel region through lookup in the correction data table, using the correction data to correct voltage waveform data corresponding to the voltage signal, and judging whether or not the touch screen is touched based on the corrected voltage waveform data.

2. The method according to claim 1, further comprising a step of pre-establishing the correspondences between each gray scale and the correction data for the gray scale, the step comprising:

controlling the touch screen to output a preset image after an initialization of a time schedule controller is finished;

outputting a preset touch scan signal to a touch drive electrode line, receiving a reference voltage signal outputted from the touch sensing electrode line coupling with the preset touch scan signal on the touch drive electrode line, the reference voltage signal corresponding to a particular sub-pixel region, and converting the reference voltage signal into reference voltage waveform data, the reference voltage waveform data being used as reference data;

driving a certain sub-pixel of the touch screen through using a gray scale voltage for each gray scale, wherein a touch controller outputs the touch scan signal for each gray scale to the touch drive electrode line, and receives a gray scale voltage signal for the certain sub-pixel region outputted from the touch sensing electrode line coupling with the touch scan signal for each gray scale on the touch drive electrode line, so as to obtain the gray scale voltage signal for the certain sub-pixel region corresponding to each gray scale; and

converting the gray scale voltage signal for the certain sub-pixel region corresponding to each gray scale into gray scale voltage waveform data, and for each gray scale voltage waveform data, using a difference between the gray scale voltage waveform data and the reference voltage waveform data as correction data for the gray scale corresponding to the gray scale voltage waveform data so as to establish the correspondences between each gray scale and the correction data for the gray scale.

3. The method according to claim 2, wherein the preset image is a black image or a white image.

4. The method according to claim 1, wherein the step of using the correction data to correct voltage waveform data corresponding to the voltage signal comprises:

subtracting the correction data for the sub-pixel region corresponding to the position coordinates from the voltage waveform data corresponding to the voltage signal to obtain a difference, and using the difference as the corrected voltage waveform data.

5. The method according to claim 1, wherein the step of judging whether or not the touch screen is touched based on the corrected voltage waveform data comprises:

determining that the touch screen is touched when the corrected voltage waveform data is greater than preset standard data.

6. A system for detecting a touch operation on a touch screen, the system comprising a time schedule controller and a touch controller, wherein:

the time schedule controller is configured to control the touch screen to output a frame image, to use pre-established correspondences between each gray scale and correction data for the gray scale to convert the gray scale of each sub-pixel region in the image into the correction data for the gray scale, and to use the obtained correction data to constitute a correction data table, the correction data table comprising correspondences between each sub-pixel region in the image and the correction data; and

the touch controller is configured to output a touch scan signal to a touch drive electrode line, and to receive a voltage signal outputted from a touch sensing electrode line coupling with the touch scan signal on the touch drive electrode line, the voltage signal being used to determine position coordinates of a possible touch position on the touch screen; and

the touch controller is further configured to determine the sub-pixel region corresponding to the position coordinates, to determine the correction data corresponding to the sub-pixel region through lookup in the correction data table, to use the correction data to correct voltage waveform data corresponding to the voltage signal, and to judge whether or not the touch screen is touched based on the corrected voltage waveform data.

7. The system according to claim 6, wherein

the time schedule controller is further configured to control the touch screen to output a preset image after an initialization of the time schedule controller is finished;

the touch controller is further configured to output a preset touch scan signal to a touch drive electrode line, to receive a reference voltage signal outputted from the touch sensing electrode line coupling with the preset touch scan signal on the touch drive electrode line, the reference voltage signal corresponding to a particular sub-pixel region, and convert the reference voltage signal into reference voltage waveform data, the reference voltage waveform data being used as reference data;

the touch controller is further configured to drive a certain sub-pixel of the touch screen through using a gray scale voltage for each gray scale, wherein the touch controller outputs the touch scan signal for each gray scale to the touch drive electrode line, and receives a gray scale voltage signal for the certain sub-pixel region outputted from the touch sensing electrode line coupling with the touch scan signal for each gray scale on the touch drive electrode line, so as to obtain the gray scale voltage signal for the certain sub-pixel region corresponding to each gray scale; and

the touch controller is further configured to convert the gray scale voltage signal for the certain sub-pixel region corresponding to each gray scale into gray scale voltage waveform data, and for each gray scale voltage waveform data, use a difference between the gray scale voltage waveform data and the reference voltage waveform data as correction data for the gray scale corresponding to the gray scale voltage waveform data so as to establish the correspondences between each gray scale and the correction data for the gray scale.

8. The system according to claim 6, wherein, when using the correction data to correct voltage waveform data corresponding to the voltage signal,

the touch controller is configured to subtract the correction data for the sub-pixel region corresponding to the position coordinates from the voltage waveform data corresponding to the voltage signal to obtain a difference, and use the difference as the corrected voltage waveform data.

9. The system according to claim 6, wherein, when judging whether or not the touch screen is touched based on the corrected voltage waveform data, the touch controller is configured to determine that the touch screen is touched when the corrected voltage waveform data is greater than preset standard data.

10. A touch display device, comprising a system for detecting a touch operation on a touch screen, the system comprising a time schedule controller and a touch controller, wherein:

the time schedule controller is configured to control the touch screen to output a frame image, to use pre-established correspondences between each gray scale and correction data for the gray scale to convert the gray scale of each sub-pixel region in the image into the correction data for the gray scale, and to use the obtained correction data to constitute a correction data table, the correction data table comprising correspondences between each sub-pixel region in the image and the correction data; and

the touch controller is configured to output a touch scan signal to a touch drive electrode line, and to receive a voltage signal outputted from a touch sensing electrode line coupling with the touch scan signal on the touch drive electrode line, the voltage signal being used to determine position coordinates of a possible touch position on the touch screen; and

the touch controller is further configured to determine the sub-pixel region corresponding to the position coordinates, to determine the correction data corresponding to the sub-pixel region through lookup in the correction data table, to use the correction data to correct voltage waveform data corresponding to the voltage signal, and to judge whether or not the touch screen is touched based on the corrected voltage waveform data.

11. The touch display device according to claim 10, wherein

the time schedule controller is further configured to control the touch screen to output a preset image after an initialization of the time schedule controller is finished;

the touch controller is further configured to output a preset touch scan signal to a touch drive electrode line, to receive a reference voltage signal outputted from the touch sensing electrode line coupling with the preset touch scan signal on the touch drive electrode line, the reference voltage signal corresponding to a particular sub-pixel region, and convert the reference voltage signal into reference voltage waveform data, the reference voltage waveform data being used as reference data;

the touch controller is further configured to drive a certain sub-pixel of the touch screen through using a gray scale voltage for each gray scale, wherein the touch controller outputs the touch scan signal for each gray scale to the touch drive electrode line, and receives a gray scale voltage signal for the certain sub-pixel region outputted from the touch sensing electrode line coupling with the touch scan signal for each gray scale on the touch drive electrode line, so as to obtain the gray scale voltage signal for the certain sub-pixel region corresponding to each gray scale; and

the touch controller is further configured to convert the gray scale voltage signal for the certain sub-pixel region corresponding to each gray scale into gray scale voltage waveform data, and for each gray scale voltage waveform data, use a difference between the gray scale voltage waveform data and the reference voltage waveform data as correction data for the gray scale corresponding to the gray scale voltage waveform data so as to establish the correspondences between each gray scale and the correction data for the gray scale.

12. The touch display device according to claim 10, wherein, when using the correction data to correct voltage waveform data corresponding to the voltage signal, the touch controller is configured to subtract the correction data for the sub-pixel region corresponding to the position coordinates from the voltage waveform data corresponding to the voltage signal to obtain a difference, and use the difference as the corrected voltage waveform data.

13. The touch display device according to claim 10, wherein, when judging whether or not the touch screen is touched based on the corrected voltage waveform data, the touch controller is configured to determine that the touch screen is touched when the corrected voltage waveform data is greater than preset standard data.