Driving system, sensing method and driving circuit for touch display device

Patent metadata

Field	Value
Publication number	US-2021072859-A1
Application number	US-202016784176-A
Country	US
Kind code	A1
Filing date	Feb 6, 2020
Priority date	Sep 8, 2019
Publication date	Mar 11, 2021
Grant date	—

Abstract

A driving system for a touch display device includes a timing controller, configured to output a plurality of first data and receive a plurality of second data; and a driving module, coupled to the timing controller, comprises a display driving module, configured to output a plurality of output voltages according to the plurality of first data output by the timing controller; and a sensing module, configured to receive a plurality of display sensing data and a plurality of touch sensing data to generate the plurality of second data to the timing controller.

First claim

What is claimed is:

1 . A driving system for a touch display device, comprising:
a timing controller, configured to output a plurality of first data and receive a plurality of second data; and a driving module, coupled to the timing controller, comprising:
a display driving module, configured to output a plurality of output voltages according to the plurality of first data output by the timing controller; and
a sensing module, configured to receive a plurality of display sensing data and a plurality of touch sensing data to generate the plurality of second data to the timing controller.

2 . The driving system of claim 1 , wherein the plurality of display sensing data are sensed during a vertical blanking period or a plurality of horizontal blanking periods of a display of the touch display device, and the plurality of touch sensing data are sensed during the vertical-blanking period of the display.

3 . The driving system of claim 2 , wherein during the vertical-blanking period of the touch display device, the plurality of display sensing data and the plurality of touch sensing data are sensed by a time-division multiplexing method.

4 . The driving system of claim 1 , wherein the timing controller is configured to perform a compensation method for displaying and a coordination extraction for touch sensing according to the plurality of second data.

5 . The driving system of claim 1 , wherein the sensing module comprises:
a plurality of first multiplexers, configured to receive and switch outputting the plurality of display sensing data and the plurality of touch sensing data by a time-division multiplexing method.

6 . The driving system of claim 5 , wherein the sensing module further comprises:
a plurality of analog front end (AFE) circuits, configured to receive the plurality of display sensing data or the plurality of touch sensing data from the plurality of multiplexers based on a sensing mode signal; a second multiplexer, configured to switch outputting the plurality of display sensing data or the plurality of touch sensing data; an analog to digital converter (ADC) circuit, configured to convert the plurality of display sensing data or the plurality of touch sensing data from the plurality of AFE circuits into a plurality of digital display sensing data or a plurality of digital touch sensing data; and a transmitter, coupled to the ADC circuit and configured to transmit the plurality of digital display sensing data or the plurality of digital touch sensing data to the timing controller; wherein the sensing mode signal is related to an output of the plurality of first multiplexers.

7 . The driving system of claim 1 , wherein the sensing module comprises:
a plurality of display sensing analog front end (AFE) circuits, configured to receive the plurality of display sensing data; a plurality of third multiplexers, configured to receive the plurality of touch sensing data; a plurality of touch sensing analog front end (AFE) circuits, coupled to the plurality of third multiplexers and configured to receive the plurality of touch sensing data from the plurality of third multiplexers; and a forth multiplexer, coupled to the plurality of display sensing AFE circuits and the plurality of touch sensing AFE circuits, and configured to output the plurality of display sensing data or the plurality of touch sensing data based on a sensing mode signal.

8 . The driving system of claim 7 , wherein the sensing module further comprises:
an analog to digital converter (ADC) circuit, coupled to the forth multiplexer, and configured to convert the plurality of display sensing data or the plurality of touch sensing data from the forth multiplexer into a plurality of digital display sensing data or a plurality of digital touch sensing data; and a transmitter, coupled to the ADC circuit, and configured to transmit the plurality of digital display sensing data or the plurality of digital touch sensing data to the timing controller.

9 . The driving system of claim 1 , wherein a display of the touch display device is an organic light-emitting diode (OLED) display or a thin film transistor (TFT) liquid crystal display (LCD).

10 . A sensing method, for a touch display device, comprising:
sensing a plurality of touch sensing data during a first period within a frame time of a display of the touch display device; and sensing a plurality of display sensing data during a second period within the frame time of the display of the touch display device; wherein the first period does not overlap with the second period within the frame time.

11 . The sensing method of claim 10 , further comprising:
outputting a plurality of voltages to the display of the touch display device for displaying.

12 . The sensing method of claim 11 , wherein the first period is a vertical blanking period of the display of the touch display device, or the first period comprises a plurality of horizontal blanking periods of the display of the touch display device.

13 . The sensing method of claim 11 , wherein the display of the touch display device is an in-cell touch display device.

14 . The sensing method of claim 10 , wherein the first period is a vertical blanking period of the display of the touch display device.

15 . The sensing method of claim 14 , wherein the display of the touch display device is an on-cell touch display device or an add-on touch display device.

16 . A driving circuit for a touch display device having a timing controller for outputting a plurality of first data and receiving a plurality of second data, comprising:
a display driving circuit, configured to output a plurality of output voltages according to the plurality of first data output by the timing controller; and a sensing circuit, configured to receive a plurality of display sensing data and a plurality of touch sensing data to generate the plurality of second data to the timing controller.

17 . The driving circuit of claim 16 , wherein the plurality of display sensing data are sensed during a vertical blanking period or a plurality of horizontal blanking periods of a display of the touch display device, and the plurality of touch sensing data are sensed during the vertical-blanking period of the display.

18 . The driving circuit of claim 17 , wherein during the vertical-blanking period of the touch display device, the plurality of display sensing data and the plurality of touch sensing data are sensed by a time-division multiplexing method.

19 . The driving circuit of claim 16 , wherein the timing controller is configured to perform a compensation method for displaying and a coordination extraction for touch sensing according to the plurality of second data.

20 . The driving circuit of claim 16 , wherein the sensing circuit comprises:
a plurality of first multiplexers, configured to receive and switch outputting the plurality of display sensing data and the plurality of touch sensing data by a time-division multiplexing method.

21 . The driving circuit of claim 20 , wherein the sensing circuit further comprises:
a plurality of analog front end (AFE) circuits, configured to receive the plurality of display sensing data or the plurality of touch sensing data from the plurality of multiplexers based on a sensing mode signal; a second multiplexer, configured to switch outputting the plurality of display sensing data or the plurality of touch sensing data; an analog to digital converter (ADC) circuit, config

Assignees

• Novatek Microelectronics Corp

Inventors

• Liang Keko-Chun
• Tsai Yi-Yang
• Lin Jin-Yi
• Kang Chun-Wei
• Liu Yi-Chuan

Classifications

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/04166

  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 title