Display backlight with white balance compensation
First Claim
Patent Images
1. A flat panel display assembly, comprising:
- a flat panel display;
a backlight positioned behind said flat panel display and including;
a combining element for combining light from multiple light sources, said combining element being positioned behind said flat panel display so that combined light can be projected through said flat panel display;
a first light source comprising a first flourescent lamp positioned for directing light into said combining element;
a second light source comprising a second flourescent lamp positioned for directing light into said combining element, said second flourescent lamp having a different color characteristic than said first flourescent lamp; and
an electrical drive circuitry for driving said first and second flourescent lamps and including a control element for varying the luminance of one of said flourescent lamps relative to the other of said flourescent lamps.
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Abstract
A backlight for a flat panel display includes a light-combining wedge which combines light from multiple light sources before sending it through the flat panel display, with the light-combining wedge receiving light from two lamps, with each of the lamps producing a different color of light. A control element is used to vary the luminance of one of the lamps relative to the other to allow for an adjustable mixing of colors and thus provides an adjustable white balance.
94 Citations
11 Claims
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1. A flat panel display assembly, comprising:
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a flat panel display; a backlight positioned behind said flat panel display and including; a combining element for combining light from multiple light sources, said combining element being positioned behind said flat panel display so that combined light can be projected through said flat panel display; a first light source comprising a first flourescent lamp positioned for directing light into said combining element; a second light source comprising a second flourescent lamp positioned for directing light into said combining element, said second flourescent lamp having a different color characteristic than said first flourescent lamp; and an electrical drive circuitry for driving said first and second flourescent lamps and including a control element for varying the luminance of one of said flourescent lamps relative to the other of said flourescent lamps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a backlight for a flat panel display, the backlight being of the type having a combining element for combining light from multiple light sources and adapted to be positioned behind the flat panel display so that combined light can be projected through the display, the backlight further including first and second flourescent lamps positioned for directing light into the combining element, the improvement therein comprising:
one of the flourescent lamps having a different color characteristic than the other of the flourescent lamps and the backlight including a control element for varying the luminance of one of the flourescent lamps relative to the other of the flourescent lamps to allow the white balance of light projected through the display to be adjusted.
Specification