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Expired Canadian patentCanada

Driving circuit for image display apparatus

CA 1294075 C · Owner: Takesada, Hajime · Inventors: Hayashida, Toshiaki; Takesada, Hajime; Yamasaki, Mitsuhiro

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Abstract From the Canadian patent

A driving circuit for an image display apparatus wherein the respective rows and columns of the active matrix panel with a plurality of picture elements disposed on the matrix shape are respectively selected by the clock pulses of the given frequency to drive each of the picture elements. A counter which counts the clock pulses to introduce the binary count values and the inversion outputs and a, decoder which decodes the counter outputs to generate the pulses that sequentially shift in synchronous relation in the clock pulses are provided to feed the counter output from both the ends of the code signal line of the decoder so that the decoder may be always operated normally.

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Granted January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 12, 1987
GrantedJanuary 7, 1992
Term endedJanuary 7, 2009
Patent numberCA 1294075 C
Classification (IPC)G09G3/00 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedMay 12, 1987Patent grantedJan 7, 1992Term endedJan 7, 2009

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.