CAPACITIVE TOUCH SCREEN AND METHOD FOR MANUFACTURING THE SAME

• US 20140362030A1
• Filed: 11/15/2013
• 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, Li, Hua
• Application Number:
  US14/081,984
• Publication Number:
  US 20140362030A1
• Time in Patent Office: Days
• 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 3/04166 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 3/04182 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: Y10T 29/49105 Switch making

Abstract

A capacitive touch screen and a method for manufacturing the same are provided. The capacitive touch screen includes: a transparent medium; a plurality of sensing electrodes provided on a lower surface of the transparent medium, the plurality of sensing electrodes being arranged in a two-dimensional array; and a touch control chip bonded onto the lower surface of the transparent medium, wherein the touch control chip is connected with each of the plurality of sensing electrodes via a wire.

Claims

1. A capacitive touch screen, comprising:

a transparent medium;

a plurality of sensing electrodes disposed on a lower surface of the transparent medium, the plurality of sensing electrodes being arranged in a two-dimensional array; and

a touch control chip bonded onto the lower surface of the transparent medium, the touch control chip being connected with each of the plurality of sensing electrodes via a wire.

2. The capacitive touch screen according to claim 1, further comprising:

a flexible circuit board connected with the touch control chip, the flexible circuit board being bonded onto the lower surface of the transparent medium via an anisotropic conductive film ACF.

3. The capacitive touch screen according to claim 1, wherein the touch control chip is connected with the wire via an ACF.

4. The capacitive touch screen according to claim 1, wherein the transparent medium is provided with a visible region, a light shielding layer is disposed on the lower surface of the transparent medium, and the light shielding layer is located at the outside of the visible region.

5. The capacitive touch screen according to claim 4, wherein the touch control chip, the flexible circuit board and the wire are all disposed below the light shielding layer.

6. The capacitive touch screen according to claim 1, wherein the transparent medium is a polyethylene terephthalate PET film, a polycarbonate PC film or a polymethylmethacrylate PMMA film, and the sensing electrode is made of indium tin oxides, graphene or metal mesh.

7. The capacitive touch screen according to claim 6, wherein

the transparent medium is the PET film, and the touch control chip is bonded onto a lower surface of the PET film;

or

the transparent medium is the PC film, and the touch control chip is bonded onto a lower surface of the PC film;

or

the transparent medium is the PMMA film, and the touch control chip is bonded onto a lower surface of the PMMA film.

8. The capacitive touch screen according to claim 1, wherein the sensing electrode is in a shape of a rectangle, a diamond, a circle or an oval, and the plurality of sensing electrodes have a same size or different sizes.

9. The capacitive touch screen according to claim 1, wherein the touch control chip is configured to detect self-capacitance of each sensing electrode.

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

driving the sensing electrode by using a voltage source or a current source; and

detecting a voltage, a frequency or a charge quantity on the sensing electrode.

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

driving and detecting the sensing electrode, and driving the remaining sensing electrodes simultaneously;

or

driving and detecting the sensing electrode, and driving sensing electrodes around the sensing electrode simultaneously,

wherein a signal for driving the sensing electrode and a signal for driving the remaining sensing electrodes or a signal for driving the sensing electrodes around the sensing electrode are same voltage signals or same current signals, or are different voltage signals or different current signals.

12. The capacitive touch screen according to claim 10, wherein

the voltage source or the current source has a same frequency for the plurality of sensing electrodes;

or

the voltage source or the current source has two or more frequencies for the plurality of sensing electrodes.

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

detecting the plurality of sensing electrodes simultaneously;

or

detecting the plurality of sensing electrodes group by group.

14. The capacitive touch screen according to claim 9, wherein the touch control chip is configured to determine a touch position according to a two-dimensional sensing array.

15. The capacitive touch screen according to claim 10, wherein the touch control chip is further configured to adjust sensitivity or dynamic range of a touch detection by means of parameters of the voltage source or the current source, wherein the parameters comprise any of amplitude, frequency and time sequence or a combination thereof.

16. A method for manufacturing a capacitive touch screen, comprising:

plating a lower surface of a transparent medium with transparent conductive material, and etching the transparent conductive material to form a plurality of sensing electrodes, the plurality of sensing electrodes being arranged in a two-dimensional array; and

bonding a touch control chip onto the lower surface of the transparent medium, and connecting the touch control chip to each of the plurality of sensing electrodes via a wire.

17. The method according to claim 16, wherein the method further comprises, after bonding a touch control chip onto the lower surface of the transparent medium,

bonding a flexible circuit board onto the lower surface of the transparent medium via an anisotropic conductive film ACF by utilizing a hot pressing technique, and connecting the flexible circuit board to the touch control chip.

18. The method according to claim 16, wherein the connecting the touch control chip to each of the sensing electrodes via a wire comprises:

connecting each of the plurality of sensing electrodes to one end of a wire, and connecting the touch control chip to the other end of the wire via an ACF.

19. The method according to claim 16, wherein the method further comprises, after etching the transparent conductive material to form the plurality of the sensing electrodes,

providing the transparent medium with a visible region, and providing a light shielding layer on the lower surface of the transparent medium, wherein the light shielding layer is located at the outside of the visible region.

20. The method according to claim 19, wherein the touch control chip, the flexible circuit board and the wire are all disposed below the light shielding layer.

21. The method according to claim 16, wherein the transparent medium is a polyethylene terephthalate PET film, a polycarbonate PC film or a polymethylmethacrylate PMMA film, and the transparent conductive material is indium tin oxides, graphene or metal mesh.

22. The method according to claim 21, wherein the bonding a touch control chip onto the lower surface of the transparent medium comprises:

in a case where the transparent medium is the PET film, bonding the touch control chip onto a lower surface of the PET film;

in a case where the transparent medium is the PC film, bonding the touch control chip onto a lower surface of the PC film;

or

in a case where the transparent medium is the PMMA film, bonding the touch control chip onto a lower surface of the PMMA film.

23. The method according to claim 16, wherein the sensing electrode is in a shape of a rectangle, a diamond, a circle or an oval, and the plurality of sensing electrodes have a same size or different sizes.