Touch display device

• US 9,189,117 B2
• Filed: 12/16/2013
• Issued: 11/17/2015
• Est. Priority Date: 08/02/2013
• Status: Active Grant

• Current Assignee: FocalTech Systems Co.,Ltd
• Original Assignee: FocalTech Systems Co.,Ltd
• Inventors: Mo, Lianghua, Ouyang, Guang
• Primary Examiner(s): Edun, Muhammad N
• Application Number:
  US14/107,538
• Publication Number:
  US 20150035791A1
• Time in Patent Office: 701 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 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 Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A touch control display device is provided according to embodiments of the disclosure. The touch control display device includes: a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a common electrode and a plurality of pixel units; and a plurality of touch sensing electrodes disposed above the common electrode, where the plurality of touch sensing electrodes are arranged in a two-dimensional array. With the solution according to the embodiments of the disclosure, the noise can be reduced and the frame rate of touch detection scan can be enhanced.

Claims

1. A touch control display device comprising:

a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a common electrode and a plurality of pixel units;

a plurality of touch sensing electrodes disposed above the common electrode, wherein the plurality of touch sensing electrodes are arranged in a two-dimensional array; and

a touch control chip, wherein the touch control chip is connected to the touch sensing electrodes via respective wires, and wherein the touch control chip is bonded, in a Chip-on-Glass mode, to the first substrate or the second substrate.

2. The touch control display device according to claim 1, wherein shapes of the touch sensing electrodes are one or more of equilateral polygonal, rhombic, elongated, circular or elliptic.

3. The touch control display device according to claim 2, wherein the touch sensing electrodes are in a concave and convex structure.

4. The touch control display device according to claim 1, wherein the plurality of touch sensing electrodes are made of Indium Tin Oxide or Graphene.

5. The touch control display device according to claim 1, wherein

the wires and the plurality of touch sensing electrodes are arranged on a same layer;

or

the wires are arranged on a different layer from the plurality of touch sensing electrodes and are connected to the plurality of touch sensing electrodes through vias.

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

a Flexible Printed Circuit bound onto the first substrate or the second substrate and connected to the touch control chip.

7. The touch control display device according to claim 1, wherein

the touch control chip is configured to detect a self-capacitance of each touch sensing electrode and to determine a touch location based on a two-dimensional self-capacitance sensing array.

8. The touch control display device according to claim 7, wherein the touch control chip comprises:

a driving/receiving unit, configured to drive the touch sensing electrodes with a voltage source or current source and to receive sensing data from the touch sensing electrodes; and

a signal processing unit, configured to calculate the self-capacitance of each touch sensing electrode based on the sensing data.

9. The touch control display device according to claim 8, wherein

the driving/receiving unit is configured to drive the touch sensing electrodes with a simultaneous driving mode.

10. The touch control display device according to claim 8, wherein

the sensing data represents voltages, frequencies or electric quantities of the touch sensing electrodes.

11. The touch control display device according to claim 8, wherein

the voltage source or current source have two or more frequencies.

12. The touch control display device according to claim 8, wherein

the touch control chip is further configured to adjust sensitivity and/or dynamic range of touch detection through parameters of the voltage source or current source, and the parameters comprise one of amplitude, frequency, time sequence or any combination thereof.

13. The touch control display device according to claim 7, wherein

the touch control chip is configured to detect the self-capacitances of the plurality of the touch sensing electrodes simultaneously or to detect the self-capacitances of the touch sensing electrodes group by group.

14. The touch control display device according to claim 1, wherein

the touch control display device has an In-Plane Switching structure and the plurality of touch sensing electrodes are located on a side of the common electrode facing the liquid crystal layer;

or

the touch control display device has a Twisted Nematic structure and the plurality of touch sensing electrodes are located on the other side of the common electrode opposite to the side facing the liquid crystal layer.