Processor controlled fluorescent lamp dimmer for aircraft liquid crystal display instruments

  • US 5,428,265 A
  • Filed: 02/28/1994
  • Issued: 06/27/1995
  • Est. Priority Date: 02/28/1994
  • Status: Expired due to Term
First Claim
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1. A dimmer control arrangement for an aircraft display including a liquid crystal display and associated fluorescent lamp backlight, the control arrangement comprising:

  • sensors monitoring conditions of said fluorescent lamp effecting perceived luminance of said display, said sensors providing corresponding sensor outputs;

    an energy delivery mechanism delivering a selected magnitude of energy to said lamp at a selected frequency;

    a memory means containing a plurality of frequencies, each frequency of said plurality of frequencies is retrievable as a function of said sensor outputs; and

    a processor element receiving said sensor outputs and programmed to access said memory means and provide to said energy delivery system a representation of said selected frequency whereby said energy delivery system delivers said selected magnitude of energy at said selected frequency.

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