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Semiconductor light-emitting device and video display adopting it

  • US 20050219464A1
  • Filed: 02/15/2005
  • Published: 10/06/2005
  • Est. Priority Date: 03/30/2004
  • Status: Abandoned Application
First Claim
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1. A video display comprising:

  • an optical unit comprising at least a plurality of first light emitting devices and a light modulator, the first light emitting devices disposed along an optical path of the light modulator, the light modulator operative to modulate light incident thereon to produce modulated light in accordance with a video signal; and

    a screen arranged along an optical path of the light modulator to receive the modulated light, each first light emitting device comprising;

    a light emitting layer having a first surface through which light produced therein is transmitted;

    a second surface disposed opposite the first surface, the second surface being a reflective surface so that light incident on the second surface is reflected and transmitted through the first surface, the light emitting layer producing light having a first polarization and light having a second polarization, the light being either white light, red light, green light, or blue light;

    a light transmissive substrate disposed on the first surface, the light transmissive substrate characterized by rotating the polarization direction of light having the second polarization to the first polarization; and

    a reflective substrate disposed on the light transmissive substrate and being transmissive of light having the first polarization and reflective of light having the second polarization, so that light produced by the light emitting layer having the second polarization is reflected toward the second surface through the light transmissive substrate, wherein the light is reflected back toward the reflective substrate by the second surface, whereby light having the first polarization is converted to the second polarization so that the light which is transmitted through the reflective substrate is substantially of the second polarization.

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