Apparatus for driving of touch panel

Patent metadata

Field	Value
Publication number	US-9696845-B2
Application number	US-201514714194-A
Country	US
Kind code	B2
Filing date	May 15, 2015
Priority date	Aug 26, 2014
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

Embodiments relate to a touch panel operable in a first haptic mode and a second haptic mode. The touch panel includes first electrodes and second electrodes intersecting the first electrodes. The touch panel further includes an elastic dielectric member disposed between the first electrodes and the second electrodes to separate the first electrodes and the second electrodes. The first electrodes are applied with a first voltage during the first haptic mode. The second electrodes are applied with a reference voltage in the first haptic mode. A subset of the second electrodes is applied with a second voltage to generate electrostatic force between the subset of the second electrodes and a user's finger in the second haptic mode. The elastic dielectric member vibrates in response to the first voltage applied to the first electrodes in the first haptic mode.

First claim

What is claimed is:

1. A touch panel comprising:
first electrodes;
second electrodes separated from and intersecting the first electrodes, the second electrodes including a plurality of electrodes and adjacent electrodes, each of the plurality of electrodes disposed between a corresponding one of the adjacent electrodes and another corresponding one of the adjacent electrodes adjacent to said each of the plurality of electrodes;
bridge electrodes, each of the bridge electrodes directly connected to one end of the corresponding one of the adjacent electrodes and one end of said another corresponding one of the adjacent electrodes, the bridge electrodes physically disconnected from the plurality of electrodes; and
an elastic dielectric member disposed between the first electrodes and the second electrodes to separate the first electrodes and the second electrodes,
wherein during a first haptic mode, a first voltage is applied to the first electrodes and a reference voltage is applied to the second electrodes to vibrate the elastic dielectric member, and
wherein during a second haptic mode, (i) a second voltage is applied to one or more of the second electrodes to generate electrostatic force between the one or more of the second electrodes and a user's finger and (ii) a third voltage is applied to the first electrodes to generate additional electrostatic force between the first electrodes and the user's finger through the elastic dielectric member for providing electrostatic haptic effect to the user's finger.

2. The touch panel of claim 1 ,
wherein the first electrodes are applied with a touch driving pulse during a first sensing mode and a second sensing mode; and
wherein a first touch sense signal responsive to the touch driving pulse on the second electrodes is sensed in the first sensing mode, and a second touch sense signal responsive to the touch driving pulse on a subset of the second electrodes is sensed in the second sensing mode.

3. The touch panel of claim 2 , wherein the plurality of electrodes comprise touch sensing electrodes, and wherein the subset of the second electrodes includes the touch sensing electrodes but excludes the adjacent electrodes.

4. The touch panel of claim 3 , wherein:
in the first sensing mode, the first touch sense signal from at least one of the touch sensing electrodes and one or more of the adjacent electrodes adjacent to said one of the touch sensing electrodes is sensed to determine a force of the touch on the touch panel, and
in the second sensing mode, the second touch sense signal from said one of the touch sensing electrodes but excluding the adjacent electrodes adjacent to said one of the touch sensing electrodes is sensed to determine a location of the touch on the touch panel.

5. The touch panel of claim 4 , wherein, in the second sensing mode, the second touch sense signal from said one of the touch sensing electrodes but excluding the adjacent electrodes adjacent to said one of the touch sensing electrodes is further sensed to determine whether the touch corresponds to a user's single click or double click.

6. The touch panel of claim 5 ,
wherein, responsive to determining the touch corresponds to the user's single click or double click, the first voltage applied to the first electrodes during the first haptic mode is generated regardless of the force of the touch, and
wherein, responsive to determining the touch does not correspond to the user's single click or double click, the first voltage applied to the first electrodes during the first haptic mode or the second voltage applied to the one or more of the second electrodes during the second haptic mode is generated based on the determined force of the touch.

7. The touch panel of claim 4 , wherein, responsive to determining the touch corresponds to a static touch, the first voltage applied to the first electrodes during the first haptic mode is generated based on the determined force of the touch.

8. The touch panel of claim 4 , wherein, responsive to determining the touch corresponds to a dynamic touch, the second voltage applied to the one or more of the second electrodes during the second haptic mode is generated based on the determined force of the touch and a touch motion speed.

9. The touch panel of claim 1 , wherein the touch sensing electrodes, the adjacent electrodes, and the bridge electrodes are disposed on a same layer.

10. A method of operating a touch panel including first electrodes, second electrodes separated from and intersecting the first electrodes, bridge electrodes, and an elastic dielectric member disposed between the first electrodes and the second electrodes to separate the first electrodes and the second electrodes, the second electrodes including a plurality of electrodes and adjacent electrodes, each of the plurality of electrodes disposed between a corresponding one of the adjacent electrodes and another corresponding one of the adjacent electrodes adjacent to said each of the plurality of electrodes, each of the bridge electrodes directly connected to one end of the corresponding one of the adjacent electrodes and one end of said another corresponding one of the adjacent electrodes, the bridge electrodes physically disconnected from the plurality of electrodes, the method comprising:
applying, during a first haptic mode, a first voltage to one of the first electrodes and a reference voltage to one of the second electrodes to vibrate the elastic dielectric member; and
applying, during a second haptic mode, (i) a second voltage to one of the plurality of electrodes through a routing line coupled to the one of the plurality of electrodes, (ii) the second voltage to a first adjacent electrode of the adjacent electrodes adjacent to the one of the plurality of electrodes through another routing line coupled to the first adjacent electrode, and (iii) the second voltage to a second adjacent electrode of the adjacent electrodes adjacent to the one of the plurality of electrodes indirectly through the first adjacent electrode and a bridge electrode of the bridge electrodes directly connected between the first adjacent electrode and the second adjacent electrode to generate electrostatic force between the one or more of the second electrodes and a user's finger.

11. The method of claim 10 , wherein the first voltage applied to the first electrodes during the first haptic mode is a sine wave or a square wave at a frequency.

12. The method of claim 10 , further comprising:
applying a touch driving pulse to the first electrodes during a first sensing mode and a second sensing mode;
sensing, in the first sensing mode, a first touch sense signal responsive to the touch driving pulse on the second electrodes; and
sensing, in the second sensing mode, a second touch sense signal responsive to the touch driving pulse on a subset of the second electrodes.

13. The method of claim 12 , wherein the plurality of electrodes comprise touch sensing electrodes, and wherein the subset of the second electrodes includes the touch sensing electrodes but excludes the adjacent electrodes.

14. The method of claim 13 , wherein:
in the first sensing mode, the first touch sense signal from at least one of the touch sensing electrodes and one or more of the adjacent electrodes adjacent to said one of the touch sensing electrodes is sensed to determine a force of the touch on the touch panel, and
in the second sensing mode, the second touch sense signal from said one of the touch sensing electrodes but excluding the adjacent electrodes adjacent to said one of the touch sensing electrodes is sensed to determine a location of the touch o

Assignees

• Lg Display Co Ltd

Inventors

• Kim Eun Jung
• Son Ji Eun
• Cho Sung Yong
• Kim Ki Seon

Classifications

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F2203/04106

  Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection · CPC title

• G06F3/016 Primary

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title

• G06F3/0414

  using force sensing means to determine a position · CPC title