Input device
AssigneeAlps Electric Co., Ltd.
InventorYoshifumi MASUMOTO
Life of this patent
Estimating the term…
Abstract
An input device, disposed in front of a display device, includes a polarizing film, a λ/4 retardation film, and a touch sensor unit including first and second light transmissive films arranged farther from the outside of the input device than the polarizing film. Each of the first and second light transmissive films is formed of a film controlled such that it is approximately optically isotropic. The film exhibits birefringence caused by drawing in the machine direction upon manufacture such that the slow axis extends along the machine direction. The machine direction of the film is allowed to be orthogonal to that of the other film, thus allowing the slow axes to be orthogonal to each other in order to cancel out the slow axes such that the input device is generally isotropic.
Claims20
An input device disposed in front of a display device, the input device comprising:
- a polarizing layer;
- a λ/4 retardation layer disposed farther from the outside of the input device than the polarizing layer;
- and
- a detecting film disposed farther from the outside than the polarizing layer, wherein
- two light transmissive films are arranged farther from the outside than the polarizing layer, the films being laid one upon another such that the machine direction of the film intersects that of the other film, and
- at least one of the light transmissive films is the detecting film having a light transmissive electrode layer on its surface.
Dependencies are inferred from the claim text.