Display device with proximity detection 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 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.
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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
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification