Touch driving device

Patent metadata

Field	Value
Publication number	US-10664076-B2
Application number	US-201615771361-A
Country	US
Kind code	B2
Filing date	Nov 2, 2016
Priority date	Nov 2, 2015
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

The present invention provides a touch driving device comprising: a driving channel for supplying a first driving voltage to a sensor electrode in a multi-touch mode and supplying a second driving voltage smaller than the first driving voltage to a sensor electrode group in a one-touch mode; and a connection unit for connecting the sensor electrode to the driving channel in the first mode and connecting the sensor electrode group to the driving channel in the second mode.

First claim

The invention claimed is:

1. A touch driving device for driving a touch panel, comprising:
a driving channel configured to supply a first driving voltage to one sensor electrode in a first mode and to supply a second driving voltage that is less than the first driving voltage to one sensor electrode group including at least two or more sensor electrodes in a second mode;
a sensing unit configured to detect during the second mode a touch of the touch panel by an external object using a response signal of the one sensor electrode group in response to the second driving voltage in the second mode, and is configured to detect during the first mode a location of the touch of the touch panel using a response signal of the one sensor electrode in response to the first driving voltage in the first mode; and
a connection unit configured to connect the one sensor electrode to the driving channel in the first mode, to connect the one sensor electrode group to the driving channel in the second mode, and to be switched from the second mode to the first mode when the sensing unit detects the touch of the external object to the touch panel in the second mode,
wherein the sensing unit comprises an integrator and detects the touch of the external object to the touch panel using a first signal of an output unit of the integrator in the second mode, and detects the location of the touch using a second signal of the output unit of the integrator in the first mode.

2. The touch driving device of claim 1 , wherein the driving channel
comprises a first switch connected to a first driving voltage source and an output line of the driving channel, and a second switch connected to a second driving voltage source and the output line of the driving channel, and
closes the first switch and opens the second switch in the first mode, and opens the first switch and closes the second switch in the second mode.

3. The touch driving device of claim 1 , wherein the sensing unit detects the touch of the external object by measuring an amount of charge of the one sensor electrode group during the second mode according to the response signal of the one sensor group during the second mode, and detects the location of the touch during the first mode by measuring an amount of charge of the one sensor electrode according to the response signal of the one sensor electrode during the first mode.

4. The touch driving device of claim 1 , wherein in the integrator, a first input unit is connected to a reception line of the response signal, an integral cap is located between the first input unit and an output unit, and a reference voltage is input to a second input unit.

5. The touch driving device of claim 4 , wherein
a first reference voltage is supplied to the second input unit in the first mode and a second reference voltage is supplied to the second input unit in the second mode, and
the second reference voltage is greater than the first reference voltage.

6. The touch driving device of claim 1 , wherein a supply period of the second driving voltage is longer than a supply period of the first driving voltage.

7. A touch driving device for driving a touch panel including a plurality of sensor electrodes, comprising:
a first driving channel configured to supply a driving voltage to a first sensor electrode in a first mode and to supply the driving voltage to a first sensor electrode group including the first sensor electrode in a second mode;
a second driving channel configured to supply the driving voltage to a second sensor electrode in the first mode and to supply the driving voltage to a second sensor electrode group including the second sensor electrode in the second mode; and
a sensing unit configured to detect during the second mode a touch of the touch panel by an external object using a difference between a response signal of the first sensor electrode group to the driving voltage and a response signal of the second sensor electrode group to the driving voltage in the second mode, and to be switched to the first mode responsive to detecting the touch during the second mode, and is configured to detect during the first mode a location of the touch using at least one of a response signal of the first sensor electrode to the driving voltage supplied to the first sensor electrode or a response signal of the second sensor electrode to the driving voltage supplied to the second sensor electrode during the first mode,
wherein the sensing unit comprises an integrator and detects the touch of the external object to the touch panel using a first signal of an output unit of the integrator in the second mode, and detects the location of the touch using a second signal of the output unit of the integrator in the first mode.

8. The touch driving device of claim 7 , wherein
the plurality of sensor electrodes form a plurality of sensor electrode lines, and
the first sensor electrode group is composed of at least one odd-numbered sensor electrode line and the second sensor electrode group is composed of at least one even-numbered sensor electrode line.

9. The touch driving device of claim 7 , wherein
the plurality of sensor electrodes form a plurality of sensor electrode lines, and
the first sensor electrode group is composed of two or more sensor electrode lines and the second sensor electrode group is composed of one sensor electrode line.

10. The touch driving device of claim 7 , wherein the sensing unit detects the touch of the external object during the second mode by measuring a difference in self-capacitances of the first sensor electrode group and the second sensor electrode group.

11. The touch driving device of claim 10 , wherein the sensor electrodes constituting the first sensor electrode group and the second sensor electrode group are disposed to cross a gate line disposed on the touch panel.

12. The touch driving device of claim 7 , wherein the first driving channel supplies a first driving voltage to the first sensor electrode in the first mode, and supplies a second driving voltage that is less than the first driving voltage to the first sensor electrode group in the second mode.

13. A touch driving device for driving a touch panel including a plurality of sensor electrodes, comprising:
a driving channel unit configured to supply a driving voltage to a first sensor electrode and a second sensor electrode in a first mode, to supply the driving voltage to a first sensor electrode group including the first sensor electrode in a first frame of a second mode, to receive a first response signal from a second sensor electrode group including the second sensor electrode, to supply the driving voltage to the second sensor electrode group in a second frame of the second mode, and to receive a second response signal to the first sensor electrode group; and
a sensing unit configured to detect during the second mode a touch of the touch panel by an external object using a difference between the first response signal and the second response signal, and is to be switched from the second mode to the first mode responsive to detecting the touch during the second mode and is configured to detect during the first mode a location of the touch using at least one of a response signal of the first sensor electrode to the driving voltage supplied to the first sensor electrode or a response signal of the second sensor electrode to the driving voltage supplied to the second sensor electrode during the first mode,
wherein the sensing unit comprises an integrator and detects the touch of the external object to the touch panel using a first signal of an output unit of the integrator in the second mode, and detects

Assignees

• Silicon Works Co Ltd

Inventors

• Ahn Yongsung

Classifications

• G06F1/3262

  Power saving in digitizer or tablet · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/041 Primary

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F3/04166 Primary

  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