Planar light source device and liquid crystal display device using the same
First Claim
Patent Images
1. A planar light source device, comprising:
- a plurality of light sources each configured to emit different colors of light having different light emission angular distribution; and
a light guide plate configured to receive the different colors of light having the different light emission angular distribution from the plurality of light sources at a side face and to distribute the light over a surface thereof.
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Abstract
The liquid crystal display device has red, green, and blue LEDs, each emitting a different color light, as a light source. An acrylic lens is mounted on the emission surface of the LED to change angular distributions of light from the LED. The shape of the acrylic lens varies depending on the color of the LED. The angular distribution of emitting light thereby differs by the color of LED to cancel out wavelength dependency of transmittance at each viewing direction in a liquid crystal panel.
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Citations
15 Claims
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1. A planar light source device, comprising:
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a plurality of light sources each configured to emit different colors of light having different light emission angular distribution; and a light guide plate configured to receive the different colors of light having the different light emission angular distribution from the plurality of light sources at a side face and to distribute the light over a surface thereof. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A planar light source device, comprising:
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a plurality of light sources emitting different colors of light; a light guide plate receiving light from the plurality of light sources at a side face to distribute the light over a surface thereof; and a plurality of refractors, each of the refractors being configured to refract light from each of the plurality of light sources, wherein; a shape of each of the refractors is different for each color of the plurality of light sources; and a refraction angle of each of the refractors is different for each color of the plurality of light sources. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A liquid crystal display device, comprising:
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a planar light source comprising a light source;
a light guide plate configured to receive light from the light source at a side face to distribute the light over a surface thereof, and a hologram configured to diffract light at different angles; anda liquid crystal panel placed above an emission surface of the planar light source, the liquid crystal panel having two substrates with a liquid crystal layer interposed therebetween, wherein the hologram is arranged in order that wavelength dependence of transmittance at a viewing direction in the liquid crystal panel is canceled out by wavelength dependence of luminance at the viewing direction in the planar light source device; and wherein the hologram is placed between the light source and the light guide plate. - View Dependent Claims (15)
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Specification