Backlight device for liquid crystal display, having polarization ligh splitter and light guide with light diffusing surface, and liquid crystal display device
First Claim
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1. A backlight device comprising:
- a light source for emitting light;
a light guide for receiving the light from the light source and for emitting directional light having a maximum intensity in a first predetermined direction;
a polarization light splitter having a planar, multi-layer structure; and
a beam deflector, disposed between the light guide and the polarization light splitter, for deflecting the light from the light guide towards the polarization light splitter in a second predetermined direction substantially coinciding with a direction in which the polarization light splitter has a maximum polarization light splitting effect.
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Abstract
A backlight device including a light source for emitting light, a light guide for receiving the light from the light source and for emitting directional light having a maximum intensity in a first predetermined direction, a polarization light splitter having a planar, multi-layer structure; and a bean deflector, disposed between the light guide and the polarization light splitter, for deflecting the light from the light guide towards the polarization light splitter in a second predetermined direction substantially coinciding with a direction in which the polarization light splitter has a maximum polarization light splitting effect.
62 Citations
31 Claims
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1. A backlight device comprising:
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a light source for emitting light;
a light guide for receiving the light from the light source and for emitting directional light having a maximum intensity in a first predetermined direction;
a polarization light splitter having a planar, multi-layer structure; and
a beam deflector, disposed between the light guide and the polarization light splitter, for deflecting the light from the light guide towards the polarization light splitter in a second predetermined direction substantially coinciding with a direction in which the polarization light splitter has a maximum polarization light splitting effect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A liquid crystal display device comprising:
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a light source for emitting light;
a light guide for receiving the light from the light source and for emitting directional light having a maximum intensity in a first predetermined direction;
a polarization light splitter having a planar, multi-layer structure;
a beam deflector, disposed between the light guide and the polarization light splitter, for deflecting the light from the light guide towards the polarization light splitter in a second predetermined direction substantially coinciding with a direction in which the polarization light splitter has a maximum polarization light splitting effect such that the deflected light is transmitted through the polarization light splitter; and
a liquid crystal cell for receiving the light transmitted through the polarization light splitter to display at least one image. - View Dependent Claims (18, 19, 20, 21)
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22. A backlight device for use in a flat liquid crystal display device, the backlight device comprising:
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a light source for emitting light;
a light guide for receiving the light from the light source and for emitting directional light having a maximum intensity along a first predetermined direction;
a light deflector, disposed over the light guide, for deflecting the directional light from the light guide in a second predetermined direction; and
a polarization light splitter, disposed over the light deflector, having a light splitting effect depending on a direction of light incident thereon such that the polarization lights splitter splits the deflected light from the light deflector into two light beams having different polarization conditions with each other, the polarization light splitter reflecting one of the two light beams towards the light guide and transmitting the other one of the two light beams, and the light splitting effect being at a maximum in a direction substantially coinciding with the second predetermined direction. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification