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Light guide panel of edge-light type backlight system and edge-light type backlight system employing the same

  • US 7,223,010 B2
  • Filed: 04/15/2004
  • Issued: 05/29/2007
  • Est. Priority Date: 04/16/2003
  • Status: Active Grant
First Claim
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1. A light guide panel of an edge-light type backlight system comprising:

  • a light incident part into which light enters from a point light source; and

    a light emitting surface from which light is emitted,wherein the light incident part comprises;

    a light incident surface on which a prism pattern is formed, the light incident surface facing the point light source; and

    first and second surfaces extending from the light incident surface in a direction in which light travels and adapted to reflect light passing through the light incident surface to reduce a direction angle, the first and second surfaces being opposite to each other with respect to an optical axis,wherein the prism pattern has a horizontal section in the shape of triangles, andwherein a relationship between an apex angle of the prism pattern and a half-maximum angle satisfies the following formula;


    C3

    (90−

    α



    2,where C3 denotes the apex angle of the prism pattern, and α

    denotes the half-maximum angle at which intensity of light emitted by the point light source is half maximum.

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