Touch sensor mechanism and manufacturing method thereof

• US 9,013,446 B2
• Filed: 03/11/2013
• Issued: 04/21/2015
• Est. Priority Date: 12/07/2012
• Status: Expired due to Fees

• Current Assignee: TERA Xtal Technology Corporation
• Original Assignee: TERA Xtal Technology Corporation
• Inventors: Chung, Jun-Wen
• Primary Examiner(s): ABDULSELAM, ABBAS I
• Application Number:
  US13/794,655
• Publication Number:
  US 20140160059A1
• Time in Patent Office: 771 Days
• Field of Search: 345/173, 345/174, 178/18.01, 178/18.04, 178/18.07, 178/18.06
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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

Abstract

A touch sensor mechanism for a touch display device, includes a cover lens made by a transparent material having a dielectric constant greater than 4.5 and a compression strength greater than 700 MPa for generating a finger'"'"'s touching capacitance (C_F) while a user'"'"'s finger of a user touch thereon; and a sensor device module including a plurality of sensor devices having a sensor parasitic capacitance (C_P). The cover lens and the sensor device module are disposed in the touch display device in such a manner that a ratio of a standard deviation value (σ_U) of the finger'"'"'s touching capacitance (C_F) of the cover lens to the sensor parasitic capacitance (C_P) of the sensor device module is a signal-to-noise ratio (SNR). The SNR is adjusted along with the finger'"'"'s touching capacitance (C_F) by reducing the thickness of the cover lens.

Claims

1. A touch sensor mechanism for a touch display device, comprising:

a cover lens made by a transparent material having a dielectric constant greater than 4.5 and a compression strength greater than 700 MPa for generating a finger'"'"'s touching capacitance (C_F) while a finger of a user touches thereon; and

a sensor device module including a plurality of sensor devices having a sensor parasitic capacitance (C_P);

wherein the cover lens and the sensor device module are disposed in the touch display device in such a manner that a ratio of a standard deviation value (σ

_U) of the finger'"'"'s touching capacitance (C_F) of the cover lens to the sensor parasitic capacitance (C_P) of the sensor device module defines a signal-to-noise ratio (SNR), and the signal-to-noise ratio (SNR) is adjusted along with the finger'"'"'s touching capacitance (C_F) by reducing thickness of the cover lens.

2. The touch sensor mechanism as claimed in claim 1, wherein the touch display device is selected from a group consisting of an out-cell LCD touch display device, an in-cell LCD touch display device, an on-cell LCD touch display device, an in-cell/on-cell hybrid LCD touch display device, an out-cell OLED touch display device, an on-cell OLED touch display device, and an in-cell OLED touch display device.

3. The touch sensor mechanism as claimed in claim 2, wherein the transparent material of the cover lens is a sapphire or an aluminum oxynitrid glass.

4. The touch sensor mechanism as claimed in claim 2, wherein the sensor device module includes a first electrode layer having a y-axis circuit net, an insulated layer and a second electrode layer having an x-axis circuit net and the first electrode layer is a sensing electrode, and the second electrode layer is a driving electrode.

5. The touch sensor mechanism as claimed in claim 3, wherein a composition of the aluminum oxynitrid glass is Al_(64+x)/3O_(32-x)N_x, and 2.75≦

x≦

5.

6. A manufacturing method of a touch sensor mechanism for a touch display device, comprising the steps:

preparing a cover lens made by a transparent material having a dielectric constant greater than 4.5 and a compression strength greater than 700 MPa for generating a finger'"'"'s touching capacitance (C_F) while a finger of a user touches thereon;

forming a sensor device module including a plurality of sensor devices having a sensor parasitic capacitance (C_P); and

assembling the cover lens, the sensor device module and a touch display module with the cover lens covering the sensor device module to form the touch display device;

wherein the cover lens and the sensor device module are disposed in the touch display device in such a manner that a ratio of a standard deviation value (σ

_U) of the finger'"'"'s touching capacitance (C_F) of the cover lens to the sensor parasitic capacitance (C_P) of the sensor device module defines a signal-to-noise ratio (SNR), and the signal-to-noise ratio (SNR) is adjusted along with the finger'"'"'s touching capacitance (C_F) by reducing thickness of the cover lens.

7. The manufacturing method as claimed in claim 6, wherein the touch display module is formed with the sensor device module and the step of assembling the cover lens, the sensor device module and the touch display module is accomplished by covering the touch display module with the cover lens.

8. The manufacturing method as claimed in claim 7, wherein the touch display device is selected from a group consisting of an out-cell LCD touch display device, an in-cell LCD touch display device, an on-cell LCD touch display device, an in-cell/on-cell hybrid LCD touch display device, an out-cell OLED touch display device, an on-cell OLED touch display device, and an in-cell OLED touch display device.

9. The manufacturing method as claimed in claim 6, wherein the sensor device module is formed on the cover lens, and the step of assembling the cover lens, the sensor device module and the touch display module is accomplished by combining the cover lens with the touch display module.

10. The manufacturing method as claimed in claim 8, wherein the touch display device is an out-cell LCD touch display device.