Driving method for reducing display interference in in-cell multi-touch panel and system using the same

• US 10,067,605 B2
• Filed: 04/07/2014
• Issued: 09/04/2018
• Est. Priority Date: 04/10/2013
• Status: Active Grant

• Current Assignee: FocalTech Systems Co.,Ltd
• Original Assignee: FocalTech Systems Co.,Ltd
• Inventors: Huang, Hsin-Mao, Ho, Pei-Chang, Wang, Szu-Mien
• Primary Examiner(s): Lu, William
• Application Number:
  US14/246,897
• Publication Number:
  US 20140306906A1
• Time in Patent Office: 1,611 Days
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

In a driving method for reducing display interference in in-cell multi-touch panel, a display driving signal is provided to K gate lines and a display image signal is provided to L source lines so as to drive corresponding transistors and capacitors in a display frame for displaying an image. The method also provides a touch driving signal to N touch driving lines and receives touch signals from M sensing lines to thereby detect one or more touch point positions of an external object in a touch frame based on the touch driving signal. In each touch frame, a sequence of providing the touch driving signal to N touch driving lines is different.

Claims

1. A driving method for reducing display interference in an in-cell multi-touch panel having a thin film transistor (TFT) layer, a sensing electrode layer, and a common voltage and touch driving layer, wherein the TFT layer having K gate lines and L source lines, the sensing electrode layer having M sensing lines, the common voltage and touch driving layer having N touch driving lines, where K, L, N, M are positive integers respectively, the driving method comprising:

providing a display driving signal to the K gate lines and a display pixel signal to the L source lines so as to drive corresponding transistors and capacitors in a display frame for displaying an image; and

providing a touch driving signal to the N touch driving lines and receiving touch signals from the M sensing lines so as to detect touch point positions of an external object in a touch frame,

wherein the touch frame and the display frame are synchronous and have the same time width thereby being integrated as a touch display frame in which a first touch driving signal is provided substantially close to a first display driving signal and a last touch driving signal is substantially close to a last display driving signal, and sequence of providing the touch driving signal to the N touch driving lines in a J-th touch display frame is different from that in a (J+1)-th touch display frame;

wherein, in the J-th touch display frame, the touch driving signal is sequentially provided, starting from an i-th touch driving line and, in the (J+1)-th touch display frame, the touch driving signal is sequentially provided, starting from an (i+1)-th touch driving line, where J and i are positive integers respectively and i=2 to N.

2. The driving method as claimed in claim 1, wherein the touch frame includes X touch sub-frames, where X is a positive integer.

3. The driving method as claimed in claim 2, wherein the touch driving signal is a pulse respectively during the touch sub-frames.

4. The driving method as claimed in claim 3, wherein the pulse of the touch driving signal does not fully occupy the touch sub-frame.

5. The driving method as claimed in claim 3, wherein the pulse of the touch driving signal fully occupies the touch sub-frame.

6. The driving method as claimed in claim 2, wherein a number of the pulse of the touch driving signal ranges from zero to a certain amount when each of the gate lines is activated.

7. A system for reducing display interference in in-cell multi-touch panel, comprising:

a touch display panel, having a thin film transistor (TFT) layer, a sensing electrode layer, and a common voltage and touch driving layer, wherein the TFT layer having K gate lines and L source lines, the sensing electrode layer having M sensing lines to sense an approaching external object based on a touch driving signal, the common voltage and touch driving layer having N touch driving lines to receive a common voltage on displaying and to receive the touch driving signal on touch sensing, where K, L, M and N are positive integers respectively and K>

N; and

a touch display control subsystem, having a touch controller and a display driver such that the display driver provides a display driving signal to the K gate lines and a display pixel signal to the L source lines for driving corresponding transistors and capacitors in a display frame for displaying an image, and the touch controller provides a touch driving signal to the N touch driving lines and receives touch signals from the M sensing lines for detecting touch point positions of the approaching external object in a touch frame,

wherein the touch frame and the display frame are synchronous and have the same time width thereby being integrated as a touch display frame in which a first touch driving signal is provided substantially close to a first display driving signal and a last touch driving signal is substantially close to a last display driving signal, and a sequence of providing the touch driving signal to the N touch driving lines in a J-th touch display frame is different from that in a (J+1)-th touch display frame;

wherein, in the J-th touch display frame, the touch driving signal is sequentially provided, starting from an i-th touch driving line and, in the (J+1)-th touch display frame, the touch driving signal is sequentially provided, starting from an (i+1)-th touch driving line, where J and i are positive integers and i=2 to N.

8. The system as claimed in claim 7, wherein the M sensing lines and the L source lines are disposed on a first direction, and the L gate lines and the N touch driving lines are disposed on a second direction.

9. The system as claimed in claim 8, wherein the first direction and the second direction are substantially vertical to each other.

10. A driving method for an in-cell multi-touch panel having a thin film transistor (TFT) layer, a sensing electrode layer, and a common voltage and touch driving layer, the TFT layer having K gate lines and L source lines, the sensing electrode layer having M sensing lines, the common voltage and touch driving layer having N touch driving lines, wherein K, L, N, M are each a positive integer, the driving method comprising:

providing a display driving signal to the K gate lines and a display pixel signal to the L source lines by an integrated touch display controller so as to drive corresponding transistors and capacitors in a display frame for displaying an image; and

providing a touch driving signal to the N touch driving lines and receiving touch signals from the M sensing lines by the integrated touch display controller so as to detect touch point positions of an external object in a touch frame,

wherein the touch frame and the display frame are synchronous and have the same time width thereby being integrated as a touch display frame in which a first touch driving signal is provided substantially close to a first display driving signal and a last touch driving signal is substantially close to a last display driving signal and, each touch display frame has different sequences of providing the touch driving signal to the N touch driving lines;

wherein, in a J-th touch display frame, the touch driving signal is sequentially provided, starting from an i-th touch driving line and, in a (J+1)-th touch display frame, the touch driving signal is sequentially provided, starting from an (i+1)-th touch driving line, where J and i are positive integers respectively and i=2 to N.

11. The driving method as claimed in claim 10, wherein the touch frame includes X touch sub-frames, where X is a positive integer.

12. The driving method as claimed in claim 11, wherein the touch driving signal is a pulse respectively during the touch sub-frames.

13. The driving method as claimed in claim 12, wherein the pulse of the touch driving signal does not fully occupy the touch sub-frame.

14. The driving method as claimed in claim 12, wherein the pulse of the touch driving signal fully occupies the touch sub-frame.