Liquid crystal display device having a transparent input touch panel

• US 6,016,134 A
• Filed: 03/14/1997
• Issued: 01/18/2000
• Est. Priority Date: 03/14/1996
• Status: Expired due to Term

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Ota, Yuichi
• Primary Examiner(s): Liang, Regina
• Application Number:
  US08/816,425
• Time in Patent Office: 1,040 Days
• Field of Search: 345/104, 345/173-183, 349/12, 178/18.01, 178/18.03-18.08, 178/18.09
• US Class Current: 345/104
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133388 with constructional differences between the display region and the peripheral region
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A liquid crystal display device having a transparent input touch panel provided on a liquid crystal display panel, including a transparent sheet layer in the region corresponding to an effective area of the transparent input touch panel and the picture element area of liquid crystal display panel between the transparent input touch panel and the liquid crystal display panel; and at least one of a cohesive sheet layer, an adhesive sheet layer and a spacer of coherent strength larger than that of the transparent sheet layer provided in the plane of the transparent sheet layer around at least a portion a periphery of the transparent sheet layer.

Claims

1. In a liquid crystal display device having a transparent input touch panel provided on a liquid crystal display panel, the improvement comprising:

a transparent sheet layer in the region corresponding to an effective area of the transparent input touch panel and the picture element area of liquid crystal display panel between the transparent input touch panel and the liquid crystal display panel; and

at least one of a cohesive sheet layer and an adhesive sheet layer of coherent strength larger than that of said transparent sheet layer provided in the plane of the transparent sheet layer around at least a portion a periphery of the transparent sheet layer.

2. A liquid crystal display device according to claim 1, wherein the transparent sheet layer comprises an acrylic cohesive agent without base materials.

3. A liquid crystal display device according to claim 1, wherein the transparent sheet layer comprises a transparent elastic body.

4. A liquid crystal display device according to claim 1, wherein at least a part of the transparent sheet layer is colored.

5. A liquid crystal display device according to claim 2, wherein at least a part of the transparent sheet layer is colored.

6. A liquid crystal display device according to claim 3, wherein at least a part of the transparent sheet layer is colored.

7. A liquid crystal display device according to claims 1, 2, 3, 4, 5 or 6, comprising:

a spacer provided at an outside peripheral portion of said at least one of said cohesive sheet layer and the adhesive sheet layer between the transparent input touch panel and the liquid crystal display panel.

8. A liquid crystal display device according to claim 7, wherein a spacer has a light emission device.

9. A liquid crystal display device according to claim 8, wherein a light emission device has a function of a sidelight.

10. In a liquid crystal display device having a transparent input touch panel provided on a liquid crystal display panel, the improvement comprising:

a transparent sheet layer in the region corresponding to an effective area of the transparent input touch panel and the picture element area of liquid crystal display panel between the transparent input touch panel and the liquid crystal display panel; and

a spacer of coherent strength larger than that of said transparent sheet layer provided in the plane of the transparent sheet layer around at least a portion a periphery of the transparent sheet layer.

11. A liquid crystal display device according to claim 10, wherein the transparent sheet layer comprises an acrylic cohesive agent without base materials.

12. A liquid crystal display device according to claim 10, wherein the transparent sheet layer comprises a transparent elastic body.

13. A liquid crystal display device according to claim 10, wherein at least a part of the transparent sheet layer is colored.

14. A liquid crystal display device according to claim 11, wherein at least a part of the transparent sheet layer is colored.

15. A liquid crystal display device according to claim 12, wherein at least a part of the transparent sheet layer is colored.

16. A liquid crystal display device according to claims 10, 11, 12, 13, 14 or 15, comprising:

said spacer having a light emission device.

17. A liquid crystal display device according to claim 16, wherein said light emission device has a function of a sidelight.