DRIVING METHOD OF TOUCH SYSTEM

• US 20150062061A1
• Filed: 11/14/2013
• Published: 03/05/2015
• Est. Priority Date: 09/04/2013
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited
• Original Assignee: Chunghwa Picture Tubes Limited
• Inventors: Hsu, Chao-Yong, Chen, Hung-Hsiang, Huang, Shih-Hung
• Application Number:
  US14/079,651
• Publication Number:
  US 20150062061A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A driving method of a touch system includes a liquid crystal panel driving circuit driving each block of a plurality of blocks of a liquid crystal panel to display an image in turn according to a first control signal during a frame time; a touch sensing circuit capturing a current panel noise base line of a touch block of a touch panel non-corresponding to the block according to a second control signal during the block displaying the image; the touch sensing circuit updating a previous panel noise base line of the touch block during a previous frame time according to the current panel noise base line; the touch sensing circuit executing touch sensing on the touch block to generate touch raw data according to a third control signal; and the touch sensing circuit generating touch data according to the touch raw data and the current panel noise base line.

Claims

1. A driving method of a touch system, the touch system comprising a timing controller, a touch panel, a liquid crystal panel, a liquid crystal panel driving circuit, and a touch sensing circuit, wherein the liquid crystal panel is divided into a plurality of blocks, and the driving method comprising:

the timing controller generating a first control signal, a second control signal, and a third control signal;

the liquid crystal panel driving circuit driving each block of the plurality of blocks of the liquid crystal panel to display an image in turn according to the first control signal during a frame time;

the touch sensing circuit simultaneously capturing a current panel noise base line of a touch block of the touch panel non-corresponding to the block according to the second control signal during the block displaying the image;

the touch sensing circuit updating a previous panel noise base line of the touch block during a previous frame time according to the current panel noise base line;

the touch sensing circuit executing touch sensing on the touch block to generate corresponding touch raw data according to the third control signal; and

the touch sensing circuit generating touch data corresponding to the touch block according to the touch raw data and the current panel noise base line.

2. The driving method of claim 1, wherein when the touch sensing circuit prepares to capture the current panel noise base line of the touch block according to the second control signal and prepares to execute the touch sensing on the touch block according to the third control signal during the block displaying the image, the touch sensing circuit first executes the touch sensing on the touch block according to the third control signal, and then captures the current panel noise base line of the touch block according to the second control signal.

3. The driving method of claim 1, wherein the frame time is between two consecutive vertical synchronous signals of the touch panel.

4. The driving method of claim 1, wherein a number of the plurality of blocks is equal to a number of a plurality of touch sensing unit rows of the touch panel.

5. The driving method of claim 1, wherein the touch panel is a mutual-inductance capacitive touch panel.

6. The driving method of claim 1, wherein the touch panel is a self-inductance capacitive touch panel.

7. A driving method of a touch system, the touch system comprising a timing controller, a touch panel, a liquid crystal panel, a liquid crystal panel driving circuit, and a touch sensing circuit, wherein the liquid crystal panel is divided into a plurality of blocks, and the driving method comprising:

the timing controller generating a first control signal, a second control signal, and a third control signal;

the liquid crystal panel driving circuit driving each block of the plurality of blocks of the liquid crystal panel to display an image in turn according to the first control signal during a frame time;

the touch sensing circuit capturing a current panel noise base line corresponding to the touch panel according to the second control signal during a vertical blank time of the frame time;

the touch sensing circuit updating a previous panel noise base line of the touch block during a previous frame time according to the current panel noise base line;

the touch sensing circuit executing touch sensing on the touch block to generate corresponding touch raw data according to the third control signal; and

the touch sensing circuit generating touch data corresponding to the touch block according to the touch raw data and the current panel noise base line.

8. The driving method of claim 7, wherein the frame time is between two consecutive vertical synchronous signals of the touch panel.

9. The driving method of claim 7, wherein a number of the plurality of blocks is equal to a number of a plurality of touch sensing unit rows of the touch panel.

10. The driving method of claim 7, wherein the touch panel is a mutual-inductance capacitive touch panel.

11. The driving method of claim 7, wherein the touch panel is a self-inductance capacitive touch panel.