| 摘要 |
<p>The invention relates to a display device comprising proximity-detection means and to the method of using said device. The inventive device consists of: a liquid crystal layer (3); at least two electrodes (4, 5 and 7) which can be used to excite the liquid crystal; means of generating an electrode-control signal (30); means of generating a high-frequency signal (31) which is applied to the second electrode; and means of detecting any alteration in the high-frequency signal (32). The device also comprises means of mixing (Rscb) the high-frequency signal and the control signal. According to the inventive method, the control signal (30)-generating means supply a periodic signal comprising positive and negative half-waves and the high-frequency signal (31)-generating means inject an essentially equal quantity of a high-frequency signal during as many positive half-waves and negative half-waves of the control signal (30).</p> |
