Touch display panel and driving method thereof

• US 10,031,614 B2
• Filed: 06/23/2016
• Issued: 07/24/2018
• 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
• Primary Examiner(s): Zheng, Xuemei
• Application Number:
  US15/191,242
• Publication Number:
  US 20170003804A1
• Time in Patent Office: 761 Days
• 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 one of a plurality of display periods and one of a plurality of touch periods alternately, comprising:

a plurality of pixels disposed on the touch display panel;

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

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

2. The touch display panel as claimed in claim 1, wherein there are N clock signals among the plurality of clock signals driving the last N gate lines among the plurality of gate lines respectively before the first display period is switched to the first 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 the respective dummy clock signal to output the dummy scan signal after the first touch period is switched to a second display period among the plurality of display periods,

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

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

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

5. 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 a row of pixels among the plurality of pixels; and

N dummy gate lines, each of which is not connected to the plurality of 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 one of a plurality of display periods and one of a plurality of touch periods alternately;

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

driving the N dummy gate lines by N dummy clock signals to output a dummy scan signal respectively before a first display period among the plurality of display periods is switched to a first touch period among the plurality of touch periods; and

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

6. The driving method of the touch display panel as claimed in claim 5, wherein there are N clock signals among the plurality of clock signals driving the last N gate lines among the plurality of gate lines respectively before the first display period is switched to the first touch period,

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

7. The driving method of the touch display panel as claimed in claim 5, comprising:

driving the N dummy gate lines by the N dummy clock signals to output the dummy scan signal respectively after the first touch period is switched to a second display period among the plurality of display periods; and

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

8. The driving method of the touch display panel as claimed in claim 7, wherein there are N clock signals among the plurality of clock signals driving the first N gate lines among the plurality of gate lines respectively after the first touch period is switched to the second display period,

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