Capacitive-type touch pad having special arrangement of capacitance sensor

• US 20080218487A1
• Filed: 07/17/2007
• Published: 09/11/2008
• Est. Priority Date: 03/07/2007
• Status: Abandoned Application

• Current Assignee: Elan Microelectronics Corporation
• Original Assignee: Elan Microelectronics Corporation
• Inventors: Lin, Chun-Yu, Lin, Tse-Chi, Huang, Chun-Chung, Wang, Tsun-Min
• Application Number:
  US11/778,772
• Publication Number:
  US 20080218487A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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 pad has a controller circuitry for generating an X-Y coordinate signal; a touch screen connecting with the controller circuitry, which has a transparent substrate and a transparent conductive film provided at the transparent substrate. The transparent conductive film having a plurality of capacitance sensors distributed along an X-coordinate direction and a Y-coordinate direction. The plurality of capacitance sensors are patterned for averaging the resistance capacitance distribution.

Claims

1. A touch pad comprising:

a controller circuitry for generating an X-Y coordinate signal; and

a touch screen connecting with the controller circuitry, which comprises a transparent substrate and a transparent conductive film provided at the transparent substrate;

the transparent conductive film comprising a plurality of capacitance sensors distributed along an X-coordinate direction and a Y-coordinate direction;

wherein the plurality of capacitance sensors are patterned for averaging the resistance capacitance distribution.

2. The touchpad as claimed in claim 1, wherein the transparent conductive film is selected from one of indium tin oxide (ITO) conductive film and indium zinc oxide (IZO) conductive film.

3. The touchpad as claimed in claim 1, wherein the plurality of capacitance sensors comprise X-coordinate direction capacitance sensors and Y-coordinate direction capacitance sensors.

4. The touchpad as claimed in claim 3, wherein the X-coordinate direction and Y-coordinate direction capacitance sensors can be formed at a same layer of the touch screen or be formed at two different layers of the touch screen.

5. The touchpad as claimed in claim 3, wherein each X-coordinate direction capacitance sensor is arranged along the X-coordinate direction, parallel to each other and spacing a predetermined distance;

each Y-coordinate direction capacitance sensors is arranged along the Y-coordinate direction, parallel to each other and spacing a predetermined distance.

6. The touchpad as claimed in claim 5, further comprising a controller circuitry, which scans two adjacent X-coordinate direction capacitance sensors or Y-coordinate direction capacitance sensors once.

7. The touchpad as claimed in claim 6, wherein the plurality of capacitance sensors is strip-shaped.

8. The touchpad as claimed in claim 7, wherein each X-coordinate direction capacitance sensor connects with a pin of a controller circuitry, or two adjacent X-coordinate direction capacitance sensors connect with a pin of the controller circuitry.

9. The touchpad as claimed in claim 8, wherein each Y-coordinate direction capacitance sensor connects with a pin of the controller circuitry, or two adjacent Y-coordinate direction capacitance sensors connect with a pin of the controller circuitry.

10. The touchpad as claimed in claim 6, wherein the plurality of capacitance sensors is U-shaped.

11. The touchpad as claimed in claim 10, wherein each X-coordinate direction capacitance sensor connects with a pin of a controller circuitry.

12. The touchpad as claimed in claim 11, wherein each Y-coordinate direction capacitance sensor connects with a pin of the controller circuitry.

13. The touchpad as claimed in claim 10, wherein two adjacent X-coordinate direction capacitance sensors nest each other.

14. The touchpad as claimed in claim 13, wherein two adjacent Y-coordinate direction capacitance sensors nest each other.

15. The touchpad as claimed in claim 10, wherein the notch of each X-coordinate direction capacitance sensors can be arranged at a top portion of the touch screen or a bottom portion of the touch screen, and the notch of each Y-coordinate direction capacitance sensors can be arranged at a right portion of the touch screen or a left portion of the touch screen.

16. The touchpad as claimed in claim 3, wherein each X-coordinate direction capacitance sensor comprises a plurality of X-coordinate direction sensor units arranged along a Y-coordinate direction.

17. The touchpad as claimed in claim 16, wherein each Y-coordinate direction capacitance sensor Yi comprises a plurality of Y-coordinate direction sensor units arranged along an X-coordinate direction, two adjacent Y-coordinate direction sensor units being directly connected or being connected by a strip-shaped connector.

18. The touchpad as claimed in claim 17, wherein each X-coordinate direction sensor unit has a shape of hexagon, and each Y-coordinate direction sensor unit has a shape of quadrangle, each hexagon-shaped X-coordinate direction sensor unit being disposed at a space surrounding by 2×

2 quadrangle Y-coordinate direction sensor units.

19. The touchpad as claimed in claim 17, wherein each X-coordinate direction sensor unit and Y-coordinate direction sensor unit has a shape of quadrangle, each quadrangle-shaped X-coordinate direction sensor unit being disposed at a space surrounding by 2×

2 quadrangle Y-coordinate direction sensor units.

20. The touchpad as claimed in claim 3, wherein the X-coordinate direction or Y-coordinate direction capacitance sensors are sequentially detected by a capacitance detected function block, or two X-coordinate direction capacitance sensors or two Y-coordinate direction capacitance sensors are detected by a capacitance detected function block each time.