Thin direct-lit backlight for LCD display
First Claim
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1. A backlight suitable for use in a display, comprising:
- a diffuser plate;
a specular back reflector; and
a plurality of elongated light sources disposed between the diffuser plate and the back reflector, the light sources having a cross-sectional diameter of 2R;
wherein the light sources are positioned such that a distance T from centers of the light sources to the back reflector is no greaater than 2R;
and wherein the light sources have source-to-source spacing S, where a distance from the diffusing plate to the center of the light source is D, and wherein S/D is at least 1.5.
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Abstract
Direct-lit backlights and associated methods are disclosed in which an array of elongated light sources is placed in a cavity between a diffuser plate and a back reflector. The back reflector is a specular reflector that can have a divergence half-angle of about 10 degrees or less. The diffuser plate can be of the type that has uniform diffusing properties over its useful area. Appropriate placement of the diffuser plate, light sources, and back reflector can yield a backlight having exceptional thinness, brightness uniformity, and average brightness.
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Citations
13 Claims
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1. A backlight suitable for use in a display, comprising:
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a diffuser plate; a specular back reflector; and a plurality of elongated light sources disposed between the diffuser plate and the back reflector, the light sources having a cross-sectional diameter of 2R; wherein the light sources are positioned such that a distance T from centers of the light sources to the back reflector is no greaater than 2R; and wherein the light sources have source-to-source spacing S, where a distance from the diffusing plate to the center of the light source is D, and wherein S/D is at least 1.5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification