Proximity detection-display device and method of using said device
First Claim
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 suitable for rendering all or part 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 a control signal for the electrodes 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, if any, of the high frequency signal, wherein the device furthermore comprises means of mixing (Rscb) of the high frequency signal and of the control signal that are disposed in such a way as to allow the operation of the means of detection of proximity independently of the operation of the means for generating a control signal and in that the mixing means (Rscb) comprise a pad for access to the second electrode.
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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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Citations
18 Claims
- 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 suitable for rendering all or part 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 a control signal for the electrodes 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, if any, of the high frequency signal, wherein the device furthermore comprises means of mixing (Rscb) of the high frequency signal and of the control signal that are disposed in such a way as to allow the operation of the means of detection of proximity independently of the operation of the means for generating a control signal and in that the mixing means (Rscb) comprise a pad for access to the second electrode.
Specification