TOUCH PANEL

• US 20110012853A1
• Filed: 07/13/2010
• Published: 01/20/2011
• Est. Priority Date: 07/14/2009
• Status: Abandoned Application

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Chang, Sean, Chang, Chii-How
• Application Number:
  US12/835,490
• Publication Number:
  US 20110012853A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch panel includes a sensing layer, which has a plurality of sensing lines extending along a first direction and arranged in a row along a second direction. Each of the sensing lines individually has a first end and a second end electrically connected to a detecting circuit respectively, and the detecting circuit computes a coordinate in the first direction of a touch position in accordance with voltage variation at the first and second ends of the sensing line.

Claims

1. A touch panel, comprising:

a sensing layer comprising a plurality of sensing lines extending along a first direction and arranged in a row along a second direction, wherein each of the sensing lines has a first end and a second end, and electrically connected to a detecting circuit, and each of the sensing lines is connected to adjacent one in series through the first end or the second end;

wherein the detecting circuit computes a coordinate in the first and second directions of a touch position in accordance with voltage variation at the first and second ends of the sensing lines.

2. The touch panel of claim 1, wherein the sensing layer comprises N sensing lines, one end of an i^th sensing line and one end of an (i−

1)^th sensing line are electrically connected to each other and then electrically connected to the detecting circuit, and the other end of the i^th sensing line and one end of an (i+1)^th sensing line are electrically connected to each other and then electrically connected to the detecting circuit, where i=2, 3, 4 . . . (N−

1).

3. The touch panel of claim 2, wherein the first end of a first sensing line and the second end of an N^th sensing line are respectively connected to the detecting circuit directly, or electrically connected to each other and then electrically connected to the detecting circuit.

4. The touch panel of claim 1, wherein the sensing lines are rectangular, trapezoidal, polygonal, elliptic, bar-shaped or irregular.

5. The touch panel of claim 1, wherein the sensing line comprises a plurality of sensor units which are electrically connected by a sensing conductive line, and the sensor unit is rhombus-shaped, triangular, hexagonal, rectangular, polygonal, elliptic, circular or irregular.

6. The touch panel of claim 1, wherein a material of the sensing layer comprises ITO, AZO, SnO₂, copper, aluminum, silver, gold, metal or electrically conductive material.

7. The touch panel of claim 1, further comprising:

a first substrate, wherein the sensing layer is disposed on the first substrate by plating, physical deposition, chemical deposition, printing, sputtering, gluing or coating, and the first substrate is a transparent or opaque substrate, and a material of the first substrate comprises glass, plastic, ceramics, rubber, circuit substrate or insulation material.

8. The touch panel of claim 7, further comprising:

a protective layer disposed on one side of the sensing layer opposite to the first substrate, wherein the protective layer is a transparent or opaque substrate, and a material of the protective layer comprises glass, plastic, ceramics, rubber, circuit substrate or insulation material.

9. The touch panel of claim 8, wherein the protective layer is attached on the first substrate by a first filling layer.

10. The touch panel of claim 8, wherein the sensing layer is disposed on the protective layer by plating, physical deposition, chemical deposition, printing, sputtering, gluing or coating, and then the sensing layer and the protective layer are attached on the first substrate by gluing.

11. The touch panel of claim 8, further comprising:

an anti-reflection layer, a hardened protective layer or a dustproof layer disposed on one side of the protective layer opposite to the sensing layer.

12. The touch panel of claim 7, further comprising:

an anti-interference layer and a second substrate disposed on one side of the first substrate opposite to the sensing layer, wherein a material of the anti-interference layer comprises ITO, AZO, SnO₂, copper, aluminum, silver, gold, metal or electrically conductive material, and the second substrate is a transparent or opaque substrate, and a material of the second substrate comprises glass, plastic, ceramics, rubber, circuit substrate or insulation material.

13. The touch panel of claim 12, wherein the anti-interference layer is disposed on the first or second substrate by plating, physical deposition, chemical deposition, printing, sputtering, gluing or coating.

14. The touch panel of claim 12, wherein the anti-interference layer or the second substrate is attached on the first substrate by a second filling layer.

15. A touch panel, comprising:

a sensing layer comprising a plurality of sensing lines extending along a first direction and arranged in a row along a second direction, wherein each of the sensing lines has a first end and a second end, at least one of the first and second ends is connected to a detecting circuit, and at least one resistor is disposed between and connected to the adjacent sensing lines;

wherein the detecting circuit computes a coordinate in the first and second directions of a touch position in accordance with voltage variation of the sensing lines.

16. The touch panel of claim 15, wherein the resistor is an electronic element, a transparent resistance layer or an opaque resistance layer, the transparent resistance comprises ITO, AZO or SnO₂, and the opaque resistance layer comprises carbon, graphite or a thin film resistance formed by a semiconductor manufacturing process.

17. The touch panel of claim 15, wherein the sensing lines and the detecting circuit are connected through a plurality of conductive lines, and the resistance values of the conductive lines are lower than that of the at least one resistor.

18. The touch panel of claim 15, wherein the resistor is a connection line for connecting two adjacent sensing lines.

19. The touch panel of claim 18, wherein the sensing lines and the connecting lines are made of the same material and are integrally combined.

20. The touch panel of claim 18, wherein the sensing lines and the connecting lines are interlacingly connected to form a surface with a plurality of holes, and the sensing lines and the connecting lines are perpendicular to each other.

21. The touch panel of claim 20, wherein each of the holes is surrounded by two adjacent sensing lines and two adjacent connecting lines.

22. The touch panel of claim 15, wherein the first and second ends of each sensing line are respectively connected to the detecting circuit, or either the first end or the second end of each the sensing line is connected to the detecting circuit.

23. A touch panel, comprising:

a sensing layer comprising a plurality of sensing lines extending along a first direction and arranged in a row along a second direction, wherein each of the sensing lines has a first end and a second end, the first and second ends are connected to a detecting circuit, respectively, and lengths of the first and second ends are not equal;

wherein the detecting circuit computes a coordinate in the first and second directions of a touch position in accordance with voltage variation at the first and second ends of the sensing lines.

24. A touch panel, comprising:

a sensing layer comprising a plurality of sensing lines extending along a first direction and arranged in a row along a second direction, wherein each of the sensing lines has a first end and a second end, and the first and second ends are connected to a detecting circuit, respectively,

wherein the detecting circuit computes a coordinate in the first direction of a touch position in accordance with ratios of the sums and the differences of voltage variation at the first and second ends of the sensing line.

25. The touch panel of claim 24, wherein the detecting circuit computes the coordinate in the first direction of the touch position in accordance with at least one of the sensing lines with the maximum voltage variation.

26. The touch panel of claim 25, the detecting circuit computes the coordinate in the first direction of the touch position by a formula, X=(V_d1−

V_c1)/(V_c1+V_d1), where Vc₁ s the voltage variation at the first end of the sensing line with the maximum voltage variation and V_d1 is the voltage variation at the second end of the sensing line.

27. The touch panel of claim 25, wherein the detecting circuit computes the coordinate in the first direction of the touch position by a formula,

28. The touch panel of claim 24, wherein the detecting circuit computes a coordinate in the second direction of the touch position in accordance with the center of gravity of the voltage variation of the sensing lines.

29. The touch panel of claim 28, wherein the detecting circuit computes the coordinate in the second direction of the touch position by a formula,

30. The touch panel of claim 28, wherein the detecting circuit computes the coordinate in the second direction of the touch position by a formula,

31. The touch panel of claim 28, wherein the detecting circuit computes the coordinate in the second direction of the touch position by a formula,