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Planar light source, display device, portable terminal device, and ray direction switching element

  • US 20080137000A1
  • Filed: 10/31/2007
  • Published: 06/12/2008
  • Est. Priority Date: 05/24/2004
  • Status: Active Grant
First Claim
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1. A planar light source comprising:

  • a backlight that emits light in a planar shape;

    a ray direction regulating element that regulates a direction of light made incident from the backlight and emits the light and in which a transparent area for transmitting light and an absorption area for absorbing light are formed alternately in a direction perpendicular to a light regulating direction thereof; and

    a transparent and scattering switching element that is capable of switching a state in which light made incident from the ray direction regulating element is transmitted and a state in which the light is scattered,wherein, in the ray direction regulating element, the transparent area is provided in the absorption area in a matrix shape when the ray direction regulating element is viewed from the light regulating direction.

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