Claims
- 1. A transparent touch panel, comprising:
a pair of transparent conductive substrates each having a transparent conductive film formed on at least one surface and arranged such that the transparent conductive films of the transparent conductive substrates are allowed to face each other, said pair of transparent conductive substrates being brought into mutual contact upon depression of the transparent conductive substrate on the upper side so as to perform the position detection; and a retardation film made of an amorphous plastic material, meeting the relationship nz>ny, and having a retardation R(0), which is represented by (nx−ny)×d, falling within a range of between 90 nm and 200 nm, where d represents the thickness of said retardation film, nx represents the maximum refractive index within the plane of the retardation film, ny represents the refractive index in a direction perpendicular to nx, and nz represents the refractive index in a thickness direction of the retardation film.
- 2. The transparent touch panel according to claim 1, wherein the photoelasticity coefficient of the retardation film falls within a range of between 5×10−13 cm2/dyne and 65×10−13 cm2/dyne.
- 3. The transparent touch panel according to claim 1, wherein said one transparent conductive film is formed integral on said retardation film.
- 4. A liquid crystal display device equipped with the touch panel recited in claim 1, wherein a coating layer is formed on at least that surface of said retardation film on which said transparent conductive film is formed.
- 5. The liquid crystal display device equipped with a touch panel according to claim 4, wherein a filler is added to said coating layer.
- 6. A liquid crystal display device equipped with the touch panel recited in claim 1, wherein the glass transition temperature of said retardation film is 80° C. or higher.
- 7. A liquid crystal display device equipped with a touch panel, comprising:
a polarizing plate arranged on the side of the display surface; a liquid crystal cell; and the transparent touch panel recited in claim 1, said transparent touch panel being arranged between the polarizing plate and the liquid crystal cell.
- 8. The liquid crystal display device equipped with a touch panel according to claim 7, wherein an antireflection treatment is applied to said polarizing plate.
- 9. A liquid crystal display device equipped with a touch panel, comprising a polarizing plate, a first retardation film, a touch panel, a second retardation film and a liquid crystal cell, which are arranged in the order mentioned,
wherein, said touch panel is a resistance film type transparent touch panel, the retardation value represented by (nx−ny)×d falls within a range of between 90 nm and 200 nm, where nx represents the refractive index in the direction of the slow axis (maximum refractive index) within the planes of the first and second retardation films, ny represents the refractive index in a direction perpendicular to the slow axis, nz represents the refractive index in the thickness direction of the first and second retardation films, and d represents the thickness of the first and second retardation films, and at least one of the first and second retardation films meets the relationship nz>ny.
- 10. The liquid crystal display device equipped with a touch panel according to claim 9, wherein the first retardation film meets the relationship nz≦ny and the second retardation film meets the relationship nz>ny.
- 11. The liquid crystal display device equipped with a touch panel according to claim 9 or 10, wherein the first and second retardation films are arranged such that the nx directions of these retardation films are substantially perpendicular to each other.
- 12. The liquid crystal display device equipped with a touch panel according to claim 9, wherein the first retardation film is made of a resin having a photoelasticity coefficient falling within a range of between 5×10−13 cm2/dyne and 65×10−13 cm2/dyne.
- 13. The liquid crystal display device equipped with a touch panel according to claim 9, wherein the first and second retardation films are made of the same material.
- 14. The liquid crystal display device equipped with a touch panel according to claim 9, wherein a coating layer is formed in at least that surface of said first retardation film on which is formed the transparent conductive film.
- 15. The liquid crystal display device equipped with a touch panel according to claim 14, wherein a filler is added to said coating layer.
- 16. The liquid crystal display device equipped with a touch panel according to claim 9, wherein an antireflection treatment is applied to said polarizing plate.
- 17. The liquid crystal display device equipped with a touch panel according to claim 9, wherein a polarizing plate is arranged between the second retardation film and the liquid crystal cell.
- 18. The liquid crystal display device equipped with a touch panel according to claim 9, wherein the glass transition temperature of said first and second retardation films is 80° C. or higher.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-171522 |
Jun 1998 |
JP |
|
10-220340 |
Aug 1998 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation of application No. PCT/JP99/02919, filed Jun. 1, 1999.
[0002] This application is based upon and claims the benefit of priority from the prior Japanese Patent Applications No. 10-171522, filed Jun. 18, 1998; and No. 10-220340, filed Aug. 4, 1998, the entire contents of which are incorporated herein by reference.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/JP99/02919 |
Jun 1999 |
US |
Child |
09741286 |
Dec 2000 |
US |