Patent ID: 7663611
Filing Date: 2010-02-16
Classification: G02F,G06F,H03K

Abstract:
1. An electronic display device comprising means of detection of proximity of a conducting element situated in proximity to a display zone of the device, the device comprising: two insulating plates; a layer of material exhibiting electro-optical properties configured to render at least a portion of its surface visible under the effect of an electrical control signal, the layer being disposed between the two plates; at least one first electrode disposed on a face of one of the insulating plates; a second electrode disposed on a face of the other insulating plate opposite at least one first electrode; means for generating an image display zone control signal and outputting the image display zone control signal to the second electrode as a function of an image to be displayed on the display zone; means for generating a high frequency signal applied to the second electrode; means for detecting a modification of the high frequency signal independent of applying the image display zone control signal to the second electrode; and means of mixing the high frequency signal and the image display zone control signal, the mixing means operable to add the high frequency signal and the image display zone control signal, whereby the image display zone control signal and the high frequency signal are applied simultaneously to the second electrode.