TOUCH DISPLAY PANEL AND DRIVING METHOD THEREOF

• US 20170003804A1
• Filed: 06/23/2016
• Published: 01/05/2017
• Est. Priority Date: 07/02/2015
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: SUNG, Li-Wei, CHEN, Chung-Le, CHEN, Hung-Hsun, CHEN, Yang-Chen, CHANG, Chia-Hsiung
• Granted Patent: US 10,031,614 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 3/04184 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 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2310/0202 Addressing of scan or signal lines
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A touch display panel driven in a display period and a touch period alternately is provided, and includes a plurality of gate lines, each driven by a clock signal to output a scan signal during the display period and stop the scan signal during the touch period; and N dummy gate lines, each driven by a dummy clock signal to output a dummy scan signal before the display period is switched to the touch period, wherein at least one of rising edges of N dummy clock signals is synchronized with at least one of falling edges of the clock signals.

Claims

1. A touch display panel driven in a display period and a touch period alternately, comprising:

a plurality of pixels disposed on the touch display panel;

a plurality of gate lines, each of which is connected to the pixels in a row and driven by a clock signal to output a scan signal during the display period and stop the scan signal during the touch period; and

N dummy gate lines, each of which is not connected to the pixels and driven by a dummy clock signal to output a dummy scan signal before the display period is switched to the touch period, where N is equal to or greater than 1, wherein at least one of rising edges of N dummy clock signals is synchronized with at least one of falling edges of the clock signals.

2. The touch display panel as claimed in claim 1, wherein there are N clock signals driving the last N gate lines before the display period is switched to the touch period,

wherein the rising edges of the N dummy clock signals are synchronized with the falling edges of the N clock signals respectively.

3. The touch display panel as claimed in claim 1, wherein each of the N dummy gate lines are driven by a second dummy clock signal to output the dummy scan signal after the touch period is switched to the display period,

wherein at least one of falling edges of N second dummy clock signals is synchronized with the at least one of rising edges of the clock signals.

4. The touch display panel as claimed in claim 3, wherein there are N clock signals driving the first N gate lines after the touch period is switched to the display period,

wherein the falling edges of the N second dummy clock signals are synchronized with the rising edges of the N clock signals respectively.

5. A driving method of a touch display panel, comprising:

driving the touch display panel in a display period and a touch period alternately in a frame;

driving the touch display panel to enter the touch period at a first time point set in a first frame; and

driving the touch display panel to enter the touch period at a second time point set in a second frame following the first frame,

wherein the first time point set is different from the second time point set.

6. The driving method of the touch display panel as claimed in claim 5, wherein the second time point set is determined randomly.

7. A driving method of a touch display panel, the touch display panel comprising:

a plurality of pixels disposed on the touch display panel;

a plurality of gate lines, each of which is connected to the pixels in a row; and

N dummy gate lines, each of which is not connected to the pixels, wherein N is equal to or greater than 1,

wherein the driving method of the touch display panel comprises;

driving the touch display panel in a display period and a touch period alternately;

driving the plurality of gate lines by a plurality of clock signals to output a scan signal respectively during the touch period;

driving the N dummy gate lines by N dummy clock signal to output a dummy scan signal before the display period is switched to the touch period; and

synchronizing at least one of rising edges of the N dummy clock signals with at least one of falling edges of the clock signals.

8. The driving method of the touch display panel as claimed in claim 7, wherein there are N clock signals driving the last N gate lines before the display period is switched to the touch period,

wherein the rising edges of the N dummy clock signals are synchronized with the falling edges of the N clock signals respectively.

9. The driving method of the touch display panel as claimed in claim 7, comprising:

driving the N dummy gate lines by N second dummy clock signal to output the dummy scan signal after the touch period is switched to the display period; and

synchronizing at least one of falling edges of the N second dummy clock signals with at least one of rising edges of the clock signals.

10. The driving method of the touch display panel as claimed in claim 9, wherein there are N clock signals driving the first N gate lines before the touch period is switched to the display period,

wherein the falling edges of the N second dummy clock signals are synchronized with the rising edges of the N clock signals respectively.