Patent ID: 6411344
Filing Date: 2002-06-25
Classification: G02F,G06F

Abstract:
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, provided outside said transparent conductive films facing each other, meeting the relationship nz>ny, and having a retardation R(0), which is represented by (nxâˆ’ny)Ã—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, the photoelasticity coefficient of the retardation film falling within a range of between 5Ã—10âˆ’13 cm2/dyne and 65Ã—10âˆ’13 cm2/dyne.