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LIGHT GUIDE PLATE AND BACKLIGHT UNIT HAVING THE SAME

  • US 20090316433A1
  • Filed: 01/15/2009
  • Published: 12/24/2009
  • Est. Priority Date: 06/19/2008
  • Status: Active Grant
First Claim
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1. A light guide plate comprising:

  • a first light incident surface onto which a first external light is incident;

    a second light incident surface onto which a second external light is incident, the second light incident surface being opposite to the first light incident surface;

    a light exit surface that connects the first light incident surface to the second light incident surface to output the first and second external lights;

    a reflective surface that reflects the first and second external lights in opposition to the light exit surface; and

    a plurality of optical path changing portions that are provided on the reflective surface with a predetermined interval and recessed toward the light exit surface to reflect the first and second external lights to the light exit surface,wherein each of the optical path changing portions comprises;

    a first inclined surface having a width that is dependent upon its position relative to the first light incident surface, wherein the width of the first inclined surface increases as a distance from the first light incident surface increases for corresponding ones of the first inclined surfaces; and

    a second inclined surface having a width that is dependent upon its position relative to the second light incident surface, wherein the width of the second inclined surface increases as a distance from the second light incident surface increases for corresponding ones of the second inclined surfaces, and wherein the second inclined surface is connected to the first inclined surface.

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