TOUCH DISPLAY DEVICE

• US 20140362034A1
• Filed: 11/20/2013
• Published: 12/11/2014
• Est. Priority Date: 06/06/2013
• Status: Abandoned Application

• Current Assignee: FocalTech Systems Co.,Ltd
• Original Assignee: FocalTech Systems Co.,Ltd
• Inventors: MO, Lianghua, OUYANG, Guang
• Application Number:
  US14/085,319
• Publication Number:
  US 20140362034A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

A touch display device includes: a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate; a plurality of sensing electrodes disposed on the upper surface of the first substrate, where the plurality of sensing electrodes are arranged in a two-dimensional array; a touch control chip bound onto the upper surface of the first substrate, where each of the sensing electrodes is connected to the touch control chip by wires. The touch control chip detects the capacitance of each sensing electrode. The ability of restraining power supply noise is highly improved and the interference of noise in the touch detection is reduced in embodiments of the invention.

Claims

1. A touch display device comprising:

a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate;

a plurality of sensing electrodes disposed on the upper surface of the first substrate, wherein the plurality of sensing electrodes are arranged in a two-dimensional array; and

a touch control chip bound onto the upper surface of the first substrate, wherein each of the sensing electrodes is connected to the touch control chip via a wire;

wherein the touch control chip detects the capacitance of each sensing electrode.

2. The touch display device according to claim 1, wherein the touch control chip detects the capacitance of each sensing electrode through self-capacitance detection.

3. The touch display device according to claim 1, wherein the wires are arranged at a same layer as the plurality of sensing electrodes;

or

the wires are arranged at a different layer from the plurality of sensing electrodes.

4. The touch display device according to claim 1, wherein the touch control chip is bound onto the upper surface of the first substrate with a Chip-on-Glass mode.

5. The touch display device according to claim 1, wherein the touch display device further comprises:

a Flexible Printed Circuit, which is bound onto the upper surface of the first substrate and is connected to the touch control chip.

6. The touch display device according to claim 1, wherein the touch control chip is configured to detect each sensing electrode with a simultaneous driving mode.

7. The touch display device according to claim 1, wherein the touch control chip is configured to detect the self-capacitance of each sensing electrode by:

detecting all the sensing electrodes simultaneously;

or

detecting the sensing electrodes group by group.

8. The touch display device according to claim 1, wherein the touch control chip is configured to detect the self-capacitance of each sensing electrode by:

driving the sensing electrode with a voltage source or a current source; and

detecting a voltage, frequency or electric quantity of the sensing electrode.

9. The touch display device according to claim 1, wherein the touch control chip is configured to detect the self-capacitance of each sensing electrode by:

driving and detecting the sensing electrode and driving the rest of the sensing electrodes simultaneously;

or

driving and detecting the sensing electrode and driving sensing electrodes peripheral to the sensing electrode simultaneously;

wherein an signal for driving the sensing electrode and signals for driving the rest of the sensing electrodes and for driving the sensing electrodes peripheral to the sensing electrode simultaneously are same voltage or current signals or different voltage or current signals.

10. The touch display device according to claim 8, wherein the voltage sources or the current sources for all the sensing electrodes have a same frequency;

or

the voltage sources or the current sources for the sensing electrodes have two or more frequencies.

11. The touch display device according to claim 1, wherein the touch control chip is configured to determine a touch location based on a two-dimensional capacitance sensing array.

12. The touch display device according to claim 8, wherein the touch control chip is further configured to adjust sensitivity or dynamic range of touch detection through parameters of the voltage source or the current source, and the parameters comprise one of amplitude, frequency, time sequence or any combination thereof.

13. The touch display device according to claim 1, wherein any of the sensing electrodes is rectangular, rhombic, circular or elliptic.

14. The touch display device according to claim 1, wherein the sensing electrodes are made of transparent conductive material of Indium Tin Oxide or Graphene.

15. The touch display device according to claim 1, wherein the touch display device is in an In-Plane Switching structure or Twisted Nematic structure.