×

Driver circuit for driving electrochromic display device

  • US 4,074,256 A
  • Filed: 08/18/1976
  • Issued: 02/14/1978
  • Est. Priority Date: 08/20/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. In an electrochromic display device includng a common electrode and a plurality of segment electrodes, a driver circuit having a power source and connected to a decoder adapted to provide display information signals, comprising:

  • a drive signal generator for generating coloring and bleaching signals in response to first and second changes in state of each of said display information signals;

    a switching device composed of complementary MOSFETs connected between power source and said segment electrodes and responsive to said coloring and bleaching signals to cause an electric current from said power source to flow through said segment electrodes in directions to induce colored and bleached states, respectively;

    means for applying a display erase signal; and

    data control circuit coupled between said decoder and said drive signal generator to normally pass said display information signals to said drive signal generator, said data control circuit being responsive to said display erase signal to block said display information signals being applied to said drive signal generator, whereby said drive signal generator simultaneously generates a plurality of bleaching signals to cause said complementary MOSFETs of said switching device to apply an electric current from said power source simultaneously to all of said segment electrodes which have previously been in a colored state in a direction to induce bleached state for thereby automatically erasing displaying data.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×