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Software controllable hardware CRT dimmer

  • US 4,722,005 A
  • Filed: 09/12/1986
  • Issued: 01/26/1988
  • Est. Priority Date: 09/12/1986
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling a video display comprising:

  • a memory for storing digital signals representative of video data;

    a dimming circuit coupled to receive an output from said memory, said dimming circuit passing said stored digital signals from said memory as first output digital signals representing a video image when a dimming function is not used and said dimming circuit converting said stored digital signals by shifting said stored digital signals a predetermined number of bit position, wherein said shifted stored digital signals provide second output digital signals representing a lower intensity image when said dimming function is used;

    a digital-to-analog converter (DAC) coupled to said dimming circuit for receiving and converting said output digital signals to analog video signals;

    control means coupled to control said memory, dimming circuit and DAC, and to activate said dimming function;

    whereby said video display shows said lower intensity image when said dimming function is activated.

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