Blue backlight and phosphor layer for a color LCD
First Claim
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1. A color liquid display comprising:
- a backlight for outputting blue light;
a plurality of layers including a liquid crystal layer being intersected by said blue light, said liquid crystal layer for modulating said blue light;
a first phosphor material being irradiated by said blue light modulated by said liquid crystal layer, said first phosphor material, when irradiated by said blue light, generating red light, said first phosphor material being located in first areas overlying said plurality of layers constituting red pixels of said display;
a second phosphor material being irradiated by said blue light modulated by said liquid crystal layer, said second phosphor material, when irradiated by said blue light, generating green light, said second phosphor material being located in second areas overlying said plurality of layers constituting green pixels of said display; and
third areas overlying said plurality of layers, constituting blue pixels, having no phosphor material to allow modulated blue light to pass.
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Abstract
A color, transmissive LCD uses a backlight that supplies a uniform blue light to the back of the liquid crystal layer in an LCD. The blue light, after being modulated by the liquid crystal layer, is then incident on the back surface of phosphor material located above the liquid crystal layer. A first phosphor material, when irradiated with the blue light, generates red light for the red pixel areas of the display, and a second phosphor material, when irradiated with the blue light, generates green light for the green pixel areas of the display. No phosphor is deposited over the blue pixel areas.
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Citations
15 Claims
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1. A color liquid display comprising:
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a backlight for outputting blue light;
a plurality of layers including a liquid crystal layer being intersected by said blue light, said liquid crystal layer for modulating said blue light;
a first phosphor material being irradiated by said blue light modulated by said liquid crystal layer, said first phosphor material, when irradiated by said blue light, generating red light, said first phosphor material being located in first areas overlying said plurality of layers constituting red pixels of said display;
a second phosphor material being irradiated by said blue light modulated by said liquid crystal layer, said second phosphor material, when irradiated by said blue light, generating green light, said second phosphor material being located in second areas overlying said plurality of layers constituting green pixels of said display; and
third areas overlying said plurality of layers, constituting blue pixels, having no phosphor material to allow modulated blue light to pass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15)
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12. A method for displaying color images comprising:
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energizing at least one blue light emitting diode (LED) to output blue light from a backlight;
modulating said blue light by selectively controlling a liquid crystal layer intersected by said blue light;
irradiating a first phosphor material by said blue light modulated by said liquid crystal layer, said first phosphor material, when irradiated by said blue light, generating red light, said first phosphor material being located in first areas overlying said liquid crystal layer constituting red pixels of said display;
irradiating a second phosphor material by said blue light modulated by said liquid crystal layer, said second phosphor material, when irradiated by said blue light, generating green light, said second phosphor material being located in second areas overlying said liquid crystal layer constituting green pixels of said display; and
allowing said blue light modulated by said liquid crystal layer to pass through third areas, constituting blue pixels, overlying said liquid crystal layer, said third areas having no phosphor material.
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Specification