Touch display device, touch driving circuit, and touch sensing method

Patent metadata

Field	Value
Publication number	US-10838539-B2
Application number	US-201715798161-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Oct 31, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

There are provided a touch display device, a touch driving circuit, and a touch sensing method. More specifically, a touch display device includes a touch screen panel including a plurality of touch electrodes and a touch driving circuit configured to output a touch driving signal to at least a portion of the plurality of touch electrodes for sensing a touch. Upon detection of an event in which at least one first area of the touch screen panel is set as a touch sensing area and at least one second area of the touch screen panel is set as a non-touch sensing area, the touch driving circuit is configured to output the touch driving signal to one or more of the plurality of touch electrodes that correspond to the at least one first area of the touch screen panel.

First claim

What is claimed is:

1. A touch display device comprising:
a touch screen panel including a plurality of touch electrodes; and
a touch driving circuit configured to output a touch driving signal to at least a portion of the plurality of touch electrodes for sensing a touch initiated by a pointer, and including an output unit including a first input terminal through which the touch driving signal is input, and a second input terminal, and a control unit controlling the outputting of the touch driving signal from the output unit to the at least a portion of the plurality of touch electrodes, and including a first switch configured to control a connection between the second input terminal and the at least a portion of the plurality of touch electrodes, and a second switch configured to control a connection between a direct current (DC) voltage node and the at least a portion of the plurality of touch electrodes,
wherein, upon detection of an event in which at least one first area of the touch screen panel is set as a touch sensing area and at least one second area of the touch screen panel is set as a non-touch sensing area, the touch driving circuit is configured to output the touch driving signal to one or more of the plurality of touch electrodes that correspond to the at least one first area,
a plurality of data lines and a plurality of gate lines to supply signals for displaying images and overlapping the at least one first area and the at least second area,
wherein, before the event is detected during a touch sensing section, at least one data line of the plurality of data lines or at least one gate line of the plurality of gate lines overlapping the at least one first area and the at least one second area is supplied with a signal having a same or corresponding voltage value as the touch driving signal supplied through a plurality of signal lines to one or more of the plurality of touch electrodes that correspond to the at least one first area and the at least one second area to suppress a parasitic capacitance formed between the one or more of the plurality of touch electrodes corresponding to the at least one first area and the at least one second area and the at least one data line overlapping the at least one first area and the at least one second area, or the parasitic capacitance formed between the one or more plurality of touch electrodes corresponding to the at least one first area and at least one second area and the at least one gate line overlapping the at least one first area and the at least one second area, and
wherein, when the event is detected during the touch sensing section, at least one data line of the plurality of data lines or at least one gate line of the plurality of gate lines overlapping the at least one first area is supplied with a signal having a same or corresponding voltage value as the touch driving signal supplied through a plurality of signal lines to one or more of the plurality of touch electrodes that correspond to the at least one first area to suppress a parasitic capacitance formed between the one or more of the plurality of touch electrodes corresponding to the at least one first area and the at least one data line overlapping the at least one first area, or the parasitic capacitance formed between the one or more plurality of touch electrodes corresponding to the at least one first area and the at least one gate line overlapping the at least one first area,
wherein the at least one data line or at least one gate line overlapping the at least one first area is supplied with the signal from a circuit integrated with the touch driving circuit or the touch driving circuit, and
wherein, when the event is detected during the touch sensing section, while the at least one data line of the plurality of data lines or the at least one gate line of the plurality of gate lines overlapping the at least one second area is not supplied with the signal having the same or corresponding voltage value as the touch driving signal supplied through the plurality of signal lines to the one or more of the plurality of touch electrodes that correspond to the at least one second area, a direct current (DC) voltage which is a signal different from the touch driving signal is output to the one or more of the plurality of touch electrodes that correspond to the at least one second area,
wherein, after the event is detected during a display section, an image data voltage corresponding to image data for image display is supplied to the at least one data line overlapping the at least one first area and a black data voltage corresponding to black data is supplied to the at least one data line overlapping the at least one second area, and
wherein before the event is detected during the touch sensing section, the second switch is turned off, and when the event is detected during the touch sensing section, the second switch is turned on and the one or more of the plurality of touch electrodes that correspond to the at least one second area is connected to the DC voltage node.

2. The touch display device according to claim 1 , wherein the touch driving circuit is configured to detect the event when the touch screen panel is covered with a cover case including at least one first cover area corresponding to the at least one first area and at least one second cover area corresponding to the at least one second area.

3. The touch display device according to claim 1 , wherein, after the event is detected,
at least one second data line in the at least one second area is applied with a signal different from the touch driving signal or is in an electrically open state.

4. The touch display device according to claim 1 , wherein in the touch sensing area, after the event is detected, one or more touch electrodes in at least one column of the at least one first area that are most adjacent to the at least one second area are applied with a signal different from the touch driving signal or are in an electrically open state.

5. The touch display device according to claim 1 , wherein an intensity of the touch driving signal to be applied to the one or more touch electrodes in the touch sensing area changes after the event is detected compared to when the event is not detected.

6. The touch display device according to claim 1 , wherein in the touch sensing area, after the event is detected,
at least one second gate line in the at least one second area is applied with a signal different from the touch driving signal or is in an electrically open state.

7. A touch driving circuit configured to drive a plurality of touch electrodes in a touch screen panel, the touch driving circuit comprising:
an output unit configured to provide an input touch driving signal to at least a portion of the plurality of touch electrodes for sensing a touch initiated by a pointer and including a first input terminal through which the touch driving signal is input and a second input terminal; and
a control unit configured to, upon detection of an event according to which a first area of the touch screen panel is set to be a touch sensing area and a second area of the touch screen panel is set to be a non-touch sensing area,
provide the input touch driving signal to one or more of the plurality of touch electrodes corresponding to the first area, and
one of (1) provide a signal different from the touch driving signal to one or more of the plurality of touch electrodes corresponding to the second area of the touch screen panel, or (2) control the one or more of the plurality of touch electrodes corresponding to the second area to be in an electrically open state, and
a plurality of data lines and a plurality of gate lines to supply signals for displaying images and overlapping the first area and the second area

Assignees

• Lg Display Co Ltd

Inventors

• Hwang Juneyoun
• Kim Beomjin
• Jang Hyunguk
• Bae Sanghyuck
• Han Sungsu
• Ju Suyun
• Jung Doyoung

Classifications

• G06F3/044

  by capacitive means · CPC title

• G06F2203/04803

  Split screen, i.e. subdividing the display area or the window area into separate subareas · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title