Panel light source device and back light module for liquid crystal displaly device
AssigneeHannstar Display Corp.
InventorKei Hsiung Yang
Life of this patent
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Abstract
A panel light source device comprises a light source, a U-shaped reflector surrounding the light source, a light guide, and a plurality of metal grid wires. The light guide has an incoming surface facing the light source and an outgoing surface. The light is transmitted into the light guide from the incoming surface and then transmitted out of the light guide from the outgoing surface. The metal grid wires are disposed between the incoming surface and the light source for transmitting the light with a predetermined polarization therethrough and reflecting the rest light therefrom.
Claims20
A panel light source device comprising:
- a light source;
- a light guide having an incoming surface facing the light source and an outgoing surface, wherein the light is transmitted into the light guide from the incoming surface and then transmitted out of the light guide from the outgoing surface;
- and
- a plurality of metal grid wires disposed between the incoming surface and the light source for transmitting the light with a predetermined polarization therethrough and reflecting the rest light therefrom.
A panel light source device comprising:
- a light source;
- a light guide having an incoming surface facing the light source and an outgoing surface, wherein the light is transmitted into the light guide from the incoming surface and then transmitted out of the light guide from the outgoing surface;
- and
- cholesteric liquid crystalline polymer with a 1/4λ plate disposed between the incoming surface of the light guide and the light source for transmitting the light with a predetermined polarization therethrough and reflecting the rest light therefrom.
A liquid crystal display comprising:
- a liquid crystal display panel;
- a back light module for illuminating the liquid crystal display panel, which comprises:
- at least one light source;
- at least one reflector surrounding the light source;
- a light guide having at least one incoming surface facing the light source, a plurality of scattering elements, and an outgoing surface, wherein the light emitted form the light source is transmitted into the light guide from the incoming surface, scattered by the scattering elements, and then transmitted out of the light guide from the outgoing surface;
- and
- at least one set of metal grid wires disposed between the incoming surface and the light source for transmitting the light with a predetermined polarization therethrough and reflecting the rest light therefrom;
- and
- a plurality of optical films disposed between the outgoing surface of the light guide and the liquid crystal panel.
A liquid crystal display comprising:
- a liquid crystal display panel;
- a back light module for illuminating the liquid crystal display panel, which comprises:
- at least one light source;
- at least one reflector surrounding the light source
- a light guide having at least one incoming surface facing the light source, a plurality of scattering elements, and an outgoing surface, wherein the light emitted form the light source is transmitted into the light guide from the incoming surface, scattered by the scattering elements, and then transmitted out of the light guide from the outgoing surface;
- and
- cholesteric liquid crystalline polymer with a 1/4λ plate disposed between the incoming surface and the light source for transmitting the light with a predetermined polarization therethrough and reflecting the rest light therefrom;
- and
- a plurality of optical films disposed between the outgoing surface of the light guide and the liquid crystal panel.
Dependencies are inferred from the claim text.