Touch panel and apparatus for driving thereof

• US 10,564,742 B2
• Filed: 05/15/2015
• Issued: 02/18/2020
• Est. Priority Date: 06/23/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Hwang, Jong Hee, Kim, Ki Duk, Cho, Sung Yong, Kim, Eun Jung
• Primary Examiner(s): Lin, Hang
• Application Number:
  US14/714,180
• Publication Number:
  US 20150370356A1
• Time in Patent Office: 1,740 Days
• Field of Search: 345173-174
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Embodiments relate to a touch panel and a method of operating the touch panel. The touch panel includes first electrodes and second electrodes separated from and intersecting the first electrodes. The first electrodes are applied with a touch driving pulse during a first sensing mode and a second sensing mode. The second electrodes sense a first touch sense signal responsive to the touch driving pulse in the first sensing mode. A subset of the second electrodes senses a second touch sense signal responsive to the touch driving pulse in the second sensing mode.

Claims

1. A method of operating a touch panel including first electrodes and second electrodes separated from and intersecting the first electrodes, the second electrodes including touch sensing electrodes and adjacent electrodes adjacent to the touch sensing electrodes, the method comprising:

applying a touch driving pulse to the first electrodes during a touch force sensing mode to determine a force of a touch on the touch panel and a touch point sensing mode to determine a location of the touch on the touch panel;

sensing a first touch sense signal responsive to the touch driving pulse in the touch force sensing mode through the touch sensing electrodes and the adjacent electrodes; and

sensing a second touch sense signal responsive to the touch driving pulse in the touch point sensing mode through the touch sensing electrodes except the adjacent electrodes,

wherein the adjacent electrodes are not used to sense the second touch sense signal during a first time period, at which the touch point sensing mode is performed, but only used to sense the first touch sense signal responsive to the touch driving pulse during a second time period, at which the touch force sensing mode is performed.

2. The method of claim 1, wherein:

in the touch force sensing mode, the first touch sense signal is sensed based at least in part on a first capacitance between the first electrodes and the second electrodes including the touch sensing electrodes and the adjacent electrodes responsive to the touch driving pulse, and

in the touch point sensing mode, the second touch sense signal is sensed based at least in part on a second capacitance between the first electrodes and the touch sensing electrodes responsive to the touch driving pulse, the second capacitance less than the first capacitance.

3. The method of claim 1, further comprising:

in the touch force sensing mode determining the force of the touch on the touch panel based on the first touch sense signal sensed 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; and

in the touch point sensing mode determining the location of the touch on the touch panel based on the second touch sense signal sensed from said one of the touch sensing electrodes but excluding the adjacent electrodes adjacent to said one of the touch sensing electrodes.

4. The method of claim 3, further comprising:

electrically coupling, in the touch force sensing mode, the one or more adjacent electrodes to said one of the touch sensing electrodes; and

electrically decoupling, in the touch point sensing mode, the one or more adjacent electrodes from said one of the touch sensing electrodes.

5. The method of claim 4, further comprising placing, in the touch point sensing mode, the one or more adjacent electrodes in an electrically floating state.

6. The method of claim 3, further comprising:

responsive to determining the location of the touch in the touch point sensing mode, applying the touch driving pulse to one or more electrodes from the first electrodes corresponding to the location of the touch to determine the force of the touch individually one at a time.

7. The method of claim 3, further comprising:

responsive to failing to determine the location of the touch in the touch point sensing mode, applying the touch driving pulse to a group of electrodes from the first electrodes to determine the force of the touch simultaneously.

8. The method of claim 7, further comprising:

responsive to determining the force of the touch through the group of electrodes, selecting one or more electrodes from the group of electrodes and applying the touch driving pulse to the one or more selected electrodes to determine the location and the force of the touch individually one at a time; and

responsive to failing to determine the force of the touch through the group of electrodes, applying the touch driving pulse to the first electrodes in the touch point sensing mode to determine the location of the touch.