Touch panel having high durability

• US 20040239641A1
• Filed: 03/04/2004
• Published: 12/02/2004
• Est. Priority Date: 09/06/2001
• Status: Active Grant

• Current Assignee: Nissha Printing Company Limited (Nissha Co., Ltd.)
• Original Assignee: Nissha Printing Company Limited (Nissha Co., Ltd.)
• Inventors: Takahata, Kazuhiko, Nishikawa, Kazuhiro, Asakura, Takeshi, Hashimoto, Takao
• Granted Patent: US 7,589,798 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: H01H 13/70 having a plurality of operating members associated with different sets of contacts, e.g. keyboard mounting together a plurality of independent switches H02B
• CPC Class Codes: H01H 13/703 characterised by spacers between contact carrying layers
• CPC Class Codes: H01H 2201/018 transparent
• CPC Class Codes: H01H 2209/06 transparent

Abstract

An upper electrode plate has a 0.15 to 0.8 mm thick optically isotropic heat-resistant transparent resin plate having a glass transition temperature characteristic of not less than 150° C. The heat-resistant transparent resin plate is laminated directly or indirectly on a quarter wave plate all over their surfaces.

Claims

1. A high-durability touch panel in which an upper electrode plate in which an upper electrode formed of a transparent conductive film is provided on its lower surface and a lower electrode plate in which a lower electrode formed of a transparent conductive film is provided on its upper surface are bonded and fixed at regions except a display area so that the two electrodes are opposed to each other with an air layer therebetween, the upper electrode plate comprising a lamination of, in an order from an upper electrode side, at least a quarter wave plate and a polarizing plate whose absorption axis crosses an optical axis of the quarter wave plate at an angle of 45°

or 135°

,

wherein the upper electrode plate comprises a 0.15 to 0.8 mm thick optically isotropic heat-resistant transparent resin plate having characteristics of a glass transition temperature of not less than 150°

C. and an absorption coefficient of not more than 1.3%, and the heat resistant transparent resin plate is laminated directly or indirectly to the quarter wave plate all over their surfaces.

2. The high-durability touch panel according to claim 1, wherein the heat-resistant transparent resin plate is disposed between the quarter wave plate and the polarizing plate.

3. The high-durability touch panel according to claim 1, wherein the heat-resistant transparent resin plate is disposed below the quarter wave plate.

4. The high-durability touch panel according to claim 1, wherein the heat-resistant transparent resin plate is disposed above the polarizing plate.

5. The high-durability touch panel according to claim 1, wherein the glass transition temperature of the heat-resistant transparent resin plate is not less than 170°

C.

6. The high-durability touch panel according to claim 1, wherein the thickness of the heat-resistant transparent resin plate is 0.2 to 0.7 mm.

7. The high-durability touch panel according to claim 1, wherein the absorption coefficient of the heat-resistant transparent resin plate is not more than 1%.

8. The high-durability touch panel according to claim 1, wherein a moisture-proof PET film is disposed as a satin layer with low-reflection and antifouling functions on the polarizing plate or the heat-resistant transparent resin plate, whichever serves as an uppermost surface of the upper electrode plate.

9. The high-durability touch panel according to claim 1, further comprising a seal layer for covering at least side-end peripheries of the upper electrode plate and side-end vicinities of the lower electrode plate.

10. The high-durability touch panel according to claim 2, wherein the glass transition temperature of the heat-resistant transparent resin plate is not less than 170°

C.

11. The high-durability touch panel according to claim 3, wherein the glass transition temperature of the heat-resistant transparent resin plate is not less than 170°

C.

12. The high-durability touch panel according to claim 4, wherein the glass transition temperature of the heat-resistant transparent resin plate is not less than 170°

C.

13. The high-durability touch panel according to claim 2, wherein the thickness of the heat-resistant transparent resin plate is 0.2 to 0.7 mm.

14. The high-durability touch panel according to claim 3, wherein the thickness of the heat-resistant transparent resin plate is 0.2 to 0.7 mm.

15. The high-durability touch panel according to claim 4, wherein the thickness of the heat-resistant transparent resin plate is 0.2 to 0.7 mm.

16. The high-durability touch panel according to claim 2, wherein the absorption coefficient of the heat-resistant transparent resin plate is not more than 1%.

17. The high-durability touch panel according to claim 3, wherein the absorption coefficient of the heat-resistant transparent resin plate is not more than 1%.

18. The high-durability touch panel according to claim 4, wherein the absorption coefficient of the heat-resistant transparent resin plate is not more than 1%.

19. The high-durability touch panel according to claim 2, wherein a moisture-proof PET film is disposed as a satin layer with low-reflection and antifouling functions on the polarizing plate or the heat-resistant transparent resin plate, whichever serves as an uppermost surface of the upper electrode plate.

20. The high-durability touch panel according to claim 3, wherein a moisture-proof PET film is disposed as a satin layer with low-reflection and antifouling functions on the polarizing plate or the heat-resistant transparent resin plate, whichever serves as an uppermost surface of the upper electrode plate.

21. The high-durability touch panel according to claim 4, wherein a moisture-proof PET film is disposed as a satin layer with low-reflection and antifouling functions on the polarizing plate or the heat-resistant transparent resin plate, whichever serves as an uppermost surface of the upper electrode plate.

22. The high-durability touch panel according to claim 2, further comprising a seal layer for covering at least side-end peripheries of the upper electrode plate and side-end vicinities of the lower electrode plate.

23. The high-durability touch panel according to claim 3, further comprising a seal layer for covering at least side-end peripheries of the upper electrode plate and side-end vicinities of the lower electrode plate.

24. The high-durability touch panel according to claim 4, further comprising a seal layer for covering at least side-end peripheries of the upper electrode plate and side-end vicinities of the lower electrode plate.