Display device with proximity detection and method of using...

Details Display device with proximity detection and method of using... Display device with proximity detection and method of using...

2003-11-26

2010-02-16

Nguyen, Chanh (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C345S055000

Reexamination Certificate

active

07663611

ABSTRACT:
The invention pertains to a display device comprising means of detection of proximity and to a method of using this device. The device comprises a liquid crystal layer, at least two electrodes making it possible to excite the liquid crystal, means for generating a control signal for the electrodes, means for generating a high frequency signal applied to the second electrode, means for detecting a modification, if any, of the high frequency signal. The device also comprises means of mixing (Rscb) of the high frequency signal and of the control signal. In the method, the means for generating a control signal provide a periodic signal comprising positive and negative alternations and the means for generating a high frequency signal inject a high frequency signal at substantially equal quantity during as many positive alternations as negative alternations of the control signal.

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