Touch display driving apparatus and operation method thereof

• US 11,061,500 B2
• Filed: 09/09/2019
• Issued: 07/13/2021
• Est. Priority Date: 05/06/2019
• Status: Active Grant

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Chang, Yaw-Guang, Wang, Wei-Song
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): Almeida, Cory A
• Application Number:
  US16/563,951
• Publication Number:
  US 20200356204A1
• Time in Patent Office: 673 Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: 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
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A touch display driving apparatus and an operation method thereof are provided. A display frame period is divided into a plurality of display driving periods and a plurality of touch driving periods. During the display driving periods, the display driver circuit drives a touch display panel. During the touch driving periods, the touch driver circuit detects common electrode rows of the touch display panel. The common electrode rows are parallel to a plurality of gate lines of the touch display panel. Each of the common electrode rows serves as a current common electrode row, wherein the current common electrode row covers a plurality of corresponding gate lines of the gate lines. The touch driving period during which the current common electrode row being detected is not temporally adjacent to the display driving period during which the corresponding gate lines being driven.

Claims

1. A touch display driving apparatus, comprising:

a display driver circuit, configured to drive a plurality of gate lines of a touch display panel during a display frame period corresponding to a vertical synchronization signal to display an image frame, wherein the display frame period comprises a plurality of display driving periods, a plurality of first touch driving periods included in a first touch frame period and a plurality of second touch driving periods included in a second touch frame period, and the display driver circuit drives the touch display panel during the display driving periods; and

a touch driver circuit, configured to detect a plurality of common electrode rows of the touch display panel during the first touch driving periods and the second touch driving periods to detect a touch event,

wherein each of the common electrode rows is one of rows of common electrodes, wherein the common electrode rows are parallel to the gate lines, each of the common electrode rows serves as a current common electrode row, the current common electrode row covers a plurality of corresponding gate lines of the gate lines, the touch driver circuit is configured to perform a touch sensing operation of a touch frame during each of the first touch frame period and the second touch frame period,

wherein in the display frame period, the touch driver circuit is configured to detect the current common electrode row during one of the plurality of first touch driving periods and during one of the plurality of second touch driving periods, and

the one of the plurality of the first touch driving periods is not temporally adjacent to the display driving period during which the corresponding gate lines are driven, and the one of the plurality of second touch driving periods is not temporally adjacent to the display driving period during which the corresponding gate lines are driven.

2. The touch display driving apparatus according to claim 1, wherein the display driver circuit stops driving the touch display panel during the first touch driving periods and the second touch driving periods, and the touch driver circuit stops driving the touch display panel during the display driving periods.

3. The touch display driving apparatus according to claim 1, wherein there is at least one other touch driving period or at least one other display driving period between the touch driving period during which the current common electrode row is detected and the display driving period during which the corresponding gate lines are driven.

4. The touch display driving apparatus according to claim 1, wherein the common electrode rows are divided into a plurality of groups, and the touch driver circuit scans the common electrode rows in each of the groups in an identical scanning order.

5. An operation method of a touch display driving apparatus, comprising:

dividing a display frame period corresponding to a vertical synchronization signal into a plurality of display driving periods, a plurality of touch first driving periods included in a first touch frame period and a plurality of second touch driving periods included in a second touch frame period;

driving, by a display driver circuit, a plurality of gate lines of a touch display panel during the display driving periods to display an image frame; and

detecting, by a touch driver circuit, a plurality of common electrode rows of the touch display panel during the first touch driving periods and the second touch driving periods to detect a touch event, wherein each of the common electrode rows is one of rows of common electrodes,

wherein the common electrode rows are parallel to the gate lines, each of the common electrode rows serves as a current common electrode row, the current common electrode row covers a plurality of corresponding gate lines of the gate lines, a touch sensing operation of a touch frame is performed during each of the first touch frame period and the second touch frame period,

wherein in the display frame period, the touch driver circuit is configured to detect the current common electrode row during one of the plurality of first touch driving periods and during one of the plurality of second touch driving periods,

and one of the plurality of the first touch driving periods is not temporally adjacent to the display driving period during which the corresponding gate lines are driven, and the one of the plurality of second touch driving periods is not temporally adjacent to the display driving period during which the corresponding gate lines are driven.

6. The operation method according to claim 5, further comprising:

stopping, by the display driver circuit, driving the touch display panel during the first touch driving periods and the second touch driving periods; and

stopping, by the touch driver circuit, driving the touch display panel during the display driving periods.

7. The operation method according to claim 5, wherein there is at least one other touch driving period or at least one other display driving period between the touch driving period during which the current common electrode row is detected and the display driving period during which the corresponding gate lines are driven.

8. The operation method according to claim 5, wherein the common electrode rows are divided into a plurality of groups, and the touch driver circuit scans the common electrode rows in each of the groups in an identical scanning order.