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Display comprising touch panel

  • US 7,002,555 B1
  • Filed: 04/14/1999
  • Issued: 02/21/2006
  • Est. Priority Date: 12/04/1998
  • Status: Expired due to Fees
First Claim
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1. A display device with a touch sensor comprising:

  • (a) a transparent cover plate,(b) a transparent support plate and at least one photodetector that is mounted on the support plate and that has a photosensitive solid angle range so that the support plate lies in the photosensitive solid angle range,(c) an electrochromic cell or a liquid crystal cell located between the transparent cover plate and the transparent support plate,(d) a radiation source arranged on at least one end face of the transparent cover plate so that light of the radiation source can enter and illuminate the cover plate and the power of the produced radiation varies periodically over time at a particular frequency so that the time-varying electric signal issued by the photodetector is further processed so that only the part of the signal time-varying at approximately the same said frequency is retained.

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