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Liquid crystal device having LEDs of a wide polar lighting angle, the polar angle determining the LEDs spacing

  • US 5,499,120 A
  • Filed: 12/22/1994
  • Issued: 03/12/1996
  • Est. Priority Date: 06/26/1992
  • Status: Expired due to Fees
First Claim
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1. A display comprising:

  • a semi-transparent display element;

    a backlight sub-assembly; and

    mounting means mounting the display element over and directly adjacent to the backlight sub-assembly wherein the backlight sub-assembly comprises a two-dimensional array of light emitting diodes mounted on a circuit board, characterized in that;

    there is no diffuser between the light emitting diodes and the display element,the light emitting diodes have a wide polar lighting angle, and the spacing between the light emitting diodes is determined by the polar lighting angle such that overlapping of light from one light emitting diode to another provides the display, when viewed from the front of the display element, with substantially evenly dispersed brightness across the array.

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