Liquid crystal display with color backlighting employing light emitting diodes
First Claim
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1. A color display device including:
- a light-transmissive liquid crystal display (LCD);
a backlight arranged to illuminate the light-transmissive LCD, the backlight including at least a two-dimensional array of first color component light emitting diodes (first color component LEDs), a two-dimensional array of second color component light emitting diodes (second color component LEDs) distributed amongst the first color component LEDs, and a two-dimensional array of third color component light emitting diodes (third color component LEDs) distributed amongst the first and second color component LEDs;
LED circuitry that cyclically alternates between powering the first color component LEDs to produce first color component backlighting, powering the second color component LEDs to produce second color component backlighting, and powering the third color component LEDs to produce third color component backlighting; and
LCD circuitry that updates a display shown on the LCD, the updates being synchronized with color changes of the backlight.
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Abstract
A color display device (210, 310, 410) includes a backlight (214, 414) that cyclically emits first, second, and third component color backlighting in turn over a cycle period. The cycle period repeats at a cycling frequency (f) that exceeds a maximum human visual response frequency. A liquid crystal display (LCD) (112, 312, 412) generates a first display during the first component color backlighting, a second display during the second component color backlighting, and a third display during the third component color backlighting.
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Citations
19 Claims
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1. A color display device including:
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a light-transmissive liquid crystal display (LCD);
a backlight arranged to illuminate the light-transmissive LCD, the backlight including at least a two-dimensional array of first color component light emitting diodes (first color component LEDs), a two-dimensional array of second color component light emitting diodes (second color component LEDs) distributed amongst the first color component LEDs, and a two-dimensional array of third color component light emitting diodes (third color component LEDs) distributed amongst the first and second color component LEDs;
LED circuitry that cyclically alternates between powering the first color component LEDs to produce first color component backlighting, powering the second color component LEDs to produce second color component backlighting, and powering the third color component LEDs to produce third color component backlighting; and
LCD circuitry that updates a display shown on the LCD, the updates being synchronized with color changes of the backlight. - View Dependent Claims (2, 3, 4)
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5. A color display device including:
a light-transmissive liquid crystal display (LCD);
an array of LEDs defining a backlight for the LCD, the array of LEDs including a plurality of groups of LEDs producing light of different colors, the LEDs of each group of LEDs being distributed two-dimensionally across a display area of the LCD;
LED circuitry that selectively powers each group of LEDs in turn to produce a temporally varying backlight color that cycles through the different colors produced by the groups of LEDs with a frequency higher than a human visual response frequency; and
LCD circuitry that updates opacity of pixels of the light-transmissive LCD in synch with the temporally varying backlight color to produce a color display. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A color display device including:
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a light-transmissive liquid crystal display (LCD);
a two-dimensional array of LEDs arranged parallel with the LCD to backlight the LCD, the two-dimensional array of LEDs including a plurality of groups of LEDs producing light of different colors, the LEDs of each group of LEDs being distributed two-dimensionally across a display area of the LCD;
a waveguiding material disposed between the two-dimensional array of LEDs and the parallel light-transmissive LCD to optically couple the two-dimensional array of LEDs with the LCD;
LED circuitry that selectively powers each group of LEDs in turn to produce a temporally varying planar backlight color that cycles through the different colors produced by the groups of LEDs with a frequency higher than a human visual response frequency; and
LCD circuitry that updates opacity of pixels of the light-transmissive LCD in synch with the temporally varying planar backlight color to produce a color display.
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Specification