LINEARLY POLARIZED BACKLIGHT SOURCE IN CONJUNCTION WITH POLARIZED PHOSPHOR EMISSION SCREENS FOR USE IN LIQUID CRYSTAL DISPLAYS
First Claim
1. An apparatus for displaying images, comprising:
- (a) a light source for emitting a primary light having a specified polarization direction and comprising one or more first wavelengths;
(b) a luminescent material, optically pumped by the primary light, for emitting a secondary light having a similar polarization direction to the polarization direction of the primary light and comprising one or more second wavelengths that are different from the first wavelengths; and
(c) a liquid crystal for receiving the secondary light and the primary light and for displaying one or more images in response thereto;
(d) wherein the luminescent material is positioned between the light source and the liquid crystal.
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Accused Products
Abstract
A device for displaying images positions a luminescent material between a light source and a liquid crystal display (LCD). The light source, which comprises one or more nonpolar or semipolar III-nitride based light emitting diodes (LEDs), emits a primary light having a specified polarization direction and comprising one or more first wavelengths. This primary light emitted by the light source is a linearly polarized light that eliminates any need for a polarizer. The luminescent material, which comprises one or more phosphors, is optically pumped by the primary light and emits a secondary light having the polarization direction of the primary light, wherein the secondary light is comprised one or more second wavelengths that are different from the first wavelength. This secondary light emitted by the luminescent material is a colored light that eliminates any need for a color filter. The LCD receives the secondary light and displays one or more images in response thereto.
261 Citations
14 Claims
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1. An apparatus for displaying images, comprising:
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(a) a light source for emitting a primary light having a specified polarization direction and comprising one or more first wavelengths; (b) a luminescent material, optically pumped by the primary light, for emitting a secondary light having a similar polarization direction to the polarization direction of the primary light and comprising one or more second wavelengths that are different from the first wavelengths; and (c) a liquid crystal for receiving the secondary light and the primary light and for displaying one or more images in response thereto; (d) wherein the luminescent material is positioned between the light source and the liquid crystal. - View Dependent Claims (2, 3, 4, 5)
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6. A method of fabricating an apparatus for displaying images, comprising:
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(a) positioning a luminescent material between a light source and a liquid crystal; (b) wherein the light source emits a primary light having a specified polarization direction and comprising one or more first wavelengths; (c) wherein the luminescent material is optically pumped by the primary light, the luminescent material emits a secondary light having a similar polarization direction to the polarization direction of the primary light, and the secondary light is comprised one or more second wavelengths that are different from the first wavelengths; and (d) wherein the liquid crystal receives the secondary light and the primary light and displays one or more images in response thereto. - View Dependent Claims (7, 8, 9, 10)
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- 11. A luminescent material having a structure that emits polarized light when optically pumped by a polarized light source.
Specification