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Display systems

  • US 3,972,040 A
  • Filed: 08/12/1974
  • Issued: 07/27/1976
  • Est. Priority Date: 08/15/1973
  • Status: Expired due to Term
First Claim
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1. A refreshed display system incorporating electro-optic display elements capable of electrically latching the elements into a fixed state, said system comprising a matrix of said elements arranged in rows and columns, a grid of row electrodes each associated with a corresponding one of said rows and each connected to the elements in its corresponding row, a grid of column electrodes each associated with a corresponding one of said columns and each connected to the elements in its corresponding column, said elements being at intersections between said row and column electrodes, means for generating a pulsed operating signal having a refreshing cycle and capable of causing the elements at selected intersections to provide an otpical display signal pulse once per refreshing cycle, a memory and control arrangement capable of providing refreshed operation of said selected elements, said arrangement comprising a plurality of electrical gates associated with one of said electrode grids, each gate being connected to an individual electrode in said grid and capable when open of gating at least a part of said electrical operating signal to said individual electrode and its corresponding elements, a plurality of sensing means each associated with an individual one of the electrodes of said one grid and each capable of detecting in response to an interrogation signal the state of a physical property of the elements connected to its associated individual electrode in order to indicate whether those elements are selected to be operated, a plurality of feedback loops each separately connected between an individual one of said sensing means and an individual one of said gates and means for applying to each of the electrodes of the other of said electrode grids an interrogation signal once per refreshing cycle to cause each of said sensors to open its associated gate whenever it detects said physical property to indicate selection of an element.

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