Liquid crystal display of touch input type, and method of manufacture

• US 7,268,770 B1
• Filed: 01/08/1999
• Issued: 09/11/2007
• Est. Priority Date: 01/09/1998
• Status: Expired due to Fees

• Current Assignee: Nissha Printing Company Limited (Nissha Co., Ltd.)
• Original Assignee: Nissha Printing Company Limited (Nissha Co., Ltd.)
• Inventors: Nishikawa, Kazuhiro, Yamada, Shinya, Hashimoto, Takao, Kusuda, Yasuji, Takahata, Kazuhiko
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): KIM, RICHARD H
• Application Number:
  US09/582,864
• Time in Patent Office: 3,168 Days
• Field of Search: 349/12, 349/162, 349/156, 349/158, 349/130, 345173-183, 345/104
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch-input type liquid crystal display device comprises an upper and lower polarizer, a transparent touch panel disposed between the polarizers and a liquid crystal display. The transparent touch panel comprises upper and lower optical phase difference films, a movable electrode portion and a stationary electrode portion. A space is interposed between the optical phase difference films. The transparent touch panel is disposed between the upper polarizer and the liquid crystal display. The liquid crystal display is disposed between the transparent touch panel and the lower polarizer. The optical phase difference films are capable of providing a ¼ wavelength phase delay to light, incident thereon, having a center wavelength within a visible region. The movable electrode portion is disposed on a lower surface of the upper optical phase difference film. The stationary electrode portion is disposed on an upper surface of the lower optical phase difference film.

Claims

1. A touch-input type liquid crystal display device comprising:

an upper polarizer;

a lower polarizer;

a transparent touch panel disposed between said upper polarizer and said lower polarizer, said transparent touch panel comprising an upper optical phase difference film, a movable electrode portion, a stationary electrode portion and a lower optical phase difference film; and

a liquid crystal display,

wherein a space is interposed between said upper optical phase difference film and said lower optical phase difference film,

wherein said transparent touch panel is disposed between said upper polarizer and said liquid crystal display,

wherein said liquid crystal display is disposed between said transparent touch panel and said lower polarizer,

wherein said upper optical phase difference film is capable of providing a ¼

wavelength phase delay to light, incident thereon, having a center wavelength within a visible region,

wherein said movable electrode portion is disposed on a lower surface of said upper optical phase difference film,

wherein said lower optical phase difference film is capable of providing a ¼

wavelength phase delay to light, incident thereon, having a center wavelength within the visible region,

wherein said stationary electrode portion is disposed on an upper surface of said lower optical phase difference film,

wherein an angle formed by an optical axis of said upper optical phase difference film and a polarization axis of said upper polarizer is about 45°

,

wherein an angle formed by an optical axis of said lower optical phase difference film and linearly polarized light to be outputted from said liquid crystal display is about 45°

,

wherein an angle formed by the optical axis of said upper optical phase difference film and the optical axis of said lower optical phase difference film is about 90°

, and

wherein an angle formed by the polarization axis of said upper polarizer and linearly polarized light to be outputted from said liquid crystal display is about 90°

,

wherein said touch-input type liquid crystal display device further comprises a transparent re-peel sheet adhesively bonding overall one of a member on which said stationary electrode portion has been directly formed and said liquid crystal display or all of said member, said liquid crystal display and an other member disposed between said member and said liquid crystal display.

2. The touch-input type liquid crystal display device of claim 1, wherein said stationary electrode portion is disposed directly on an upper surface of said lower optical phase difference film.

3. The touch-input type liquid crystal display device of claim 2, wherein both said upper optical phase difference film and said lower optical phase difference film have a thermal deformation temperature of not less than 150°

C.

4. The touch-input type liquid crystal display device of claim 2, wherein both said upper optical phase difference film and said lower optical phase difference film have a thermal deformation temperature of not less than 170°

C.

5. The touch-input type liquid crystal display device of claim 1, wherein a glass substrate having optical isotropy is disposed between the stationary electrode portion and the lower optical phase difference film, and the stationary electrode portion is formed directly on the glass substrate having optical isotropy.

6. The touch-input type liquid crystal display device of claim 5, wherein said upper optical phase difference film has a thermal deformation temperature of not less than 150°

C.

7. The touch-input type liquid crystal display device of claim 5, wherein said upper optical phase difference film has a thermal deformation temperature of not less than 170°

C.

8. The touch-input type liquid crystal display device of claim 1, wherein an optically isotropic film is disposed between the stationary electrode portion and the lower optical phase difference film, and the stationary electrode portion is formed directly on the optically isotropic film.

9. The touch-input type liquid crystal display device of claim 8, wherein both said upper optical phase difference film and said optically isotropic film have a thermal deformation temperature of not less than 150°

C.

10. The touch-input type liquid crystal display device of claim 8, wherein both said upper optical phase difference film and said optically isotropic film have a thermal deformation temperature of not less than 170°

C.

11. The touch-input type liquid crystal display device of claim 8, further comprising a transparent resin plate having optical isotropy disposed between said optically isotropic film and said lower optical phase difference film.

12. The touch-input type liquid crystal display device of claim 1, further comprising a transparent resin plate having optical isotropy disposed between said transparent touch panel and said liquid crystal display.

13. The touch-input type liquid crystal display device of claim 1, wherein a thickness of said upper optical phase difference film is not less than 50 μ

m and not more than 150 μ

m.

14. The touch-input type liquid crystal display device of claim 1, further comprising a transparent film low in moisture permeability and superior in dimensional stability laminated on an upper surface of said upper polarizer.

15. The touch-input type liquid crystal display device of claim 14, further comprising a low-reflection processed layer on an upper surface of said transparent film.

16. The touch-input type liquid crystal display device of claim 14, further comprising an antifouling processed layer on an upper surface of said transparent film.

17. The touch-input type liquid crystal display device of claim 14, further comprising a hard coat processed layer on an upper surface of said transparent film.