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Data processing machine with liquid crystal display and control means for regulating backlighting to the display

  • US 5,065,357 A
  • Filed: 08/09/1990
  • Issued: 11/12/1991
  • Est. Priority Date: 07/22/1985
  • Status: Expired due to Fees
First Claim
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1. A data processing machine comprising:

  • a liquid crystal display panel for displaying data;

    means for selectively inputting data into said data processing machine, said data being displayed on said liquid crystal display panel;

    means for accessing data from an external memory, said data being displayed on said liquid crystal display panel;

    means for backlighting said liquid crystal display panel, said means for backlighting being in one of an operative state and an inoperative state, said inoperative state being a period in which said liquid crystal display panel fails to be illuminated by said means for backlighting, said operative state being a period in which said liquid crystal display panel is illuminated;

    means for counting a time period between successive inputs by said means for inputting, between successive displays on said liquid crystal display and between successive accesses of data by said means for accessing to thereby generate a signal when a length of time period corresponds to a selected period of time;

    control means for turning off said means for backlighting in response to said signal generated by said means for counting, said control means further turning said means for backlighting back on in response to operation of at least one of said means for selectively inputting data and said means for accessing data whereby power consumption of said data processing machine is reduced in response to turning off of said means for backlighting during said inoperative state;

    control register means for storing data related to brightness of said means for backlighting before said control means turns off the means for backlighting, a time period during which said means for backlighting is illuminated and a time counted by said means for counting, said control register means being operative associated with said control means to return said means for backlighting to the same brightness when said control means turns said means for backlighting back on, said control means further varying luminosity of said means for backlighting between at least two different states, said means for backlighting illumianting said liquid crystal display by a first luminosity in a first state and a second luminosity in a second state, said first luminosity being brighter than said second luminosity whereby said means for backlighting may be in a first state, a second state, or turned off by said control means; and

    means for indicating that said means for backlighting has been turned off by said control means, said means for indicating being located separate from said liquid crystal display.

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