Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2005-12-06
2005-12-06
Chang, Kent (Department: 2675)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C345S102000, C178S018090
Reexamination Certificate
active
06972753
ABSTRACT:
A touch panel using an optical sensor has a simple construction and can accurately detect an input position. An illuminating lights emitted from illuminating means are turned into lights having a high directivity in an X-axis direction and in a Y-axis direction of the prism lens sheet and thereafter enter from side faces of a light guide panel as incident lights. The incident lights advance in the inside of the light guide panel toward opposite side faces while being subjected to a total reflection and are received by the optical sensor arrays. When an input pen or a fingertip touches a surface of the light guide panel, the lights are refracted or absorbed at a touched position and hence, a quantity of received lights at the optical sensor arrays is reduced.
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Copy of Related U.S. Appl. No. 09/471,348 filed Dec. 23, 1999.
Kimura Hajime
Koyama Jun
Yamazaki Shunpei
Chang Kent
Robinson Eric J.
Robinson Intellectual Property Law Office
Semiconductor Energy Laboratory Co,. Ltd.
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