Patent ID: 8189127

Claim:
An input device for use by a user wearing a polarized glass comprising: a touch panel having a light-transmissive upper substrate with an upper conductive layer disposed on a bottom surface of the light-transmissive upper substrate, and a light-transmissive lower substrate with a lower conductive layer disposed on a top surface of the light-transmissive lower substrate so as to face the upper conductive layer at predetermined spaced intervals; a liquid crystal display element disposed below the light-transmissive lower substrate; and a polarizing plate disposed between the lower conductive layer and the liquid crystal display element, wherein at least any one of the light-transmissive upper substrate and the light-transmissive lower substrate is formed as a phase-difference plate with ¼ wavelength so that the phase-difference plate with ¼ wavelength is located close to the touch panel and over the polarizing plate, wherein the input device is absent a polarizing plate disposed over the phase-difference plate, the phase-difference plate provides outgoing-light with a phase-shift of ¼ wavelength, a polarization direction of the polarizing plate is different from a polarization direction of the polarized glass, and an outgoing-light from the liquid crystal display element changes to a circular polarized light, allowing the displays of the liquid crystal display element to be recognized even when a polarization direction of the polarizing plate has an absorption axis in the same polarization direction of the polarized glass.