LED backlighting system
First Claim
1. A liquid crystal display (LCD) device, comprising:
- a white light emitting diode;
a light pipe;
a light extracting surface located near a first side al the light pipe;
a diffuser located near a second side of the light pipe, where the first and second sides are opposite sides of the light pipe;
a reflective polarizer;
a liquid crystal display;
a first polarization scrambling material located along the light pipe opposite the liquid crystal display;
a second polarization scrambling material between the white light emitting diode and the light pipe; and
wherein light from the white light emitting diode enters the light pipe and passes through the diffuser, the reflective polarizer, then backlights the liquid crystal display.
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Accused Products
Abstract
A liquid crystal display (LCD) device having non-white and white light emitting diodes and a liquid crystal display. A spectrum converting material is positioned between non-white LEDs and the LCD to convert the non-white light from the LEDs toward a white light spectrum. The liquid crystal display may include a plurality of light emitting diodes, a light pipe, and a spectrum converting material. The spectrum converting material may be a phosphorized material located between the plurality of non-white light emitting diodes and the light pipe. A light extracting surface may be located near a first surface of the light pipe, a diffuser located near a second side of the light pipe, where the first and second sides are opposite sides of the light pipe, a reflective polarizer, and an liquid crystal display. The light from the light pipe may passes through the diffuser, the reflective polarizer, before backlighting the liquid crystal display. The non-white LEDs may include blue LED, ultraviolet LEDs, and the like.
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Citations
9 Claims
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1. A liquid crystal display (LCD) device, comprising:
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a white light emitting diode;
a light pipe;
a light extracting surface located near a first side al the light pipe;
a diffuser located near a second side of the light pipe, where the first and second sides are opposite sides of the light pipe;
a reflective polarizer;
a liquid crystal display;
a first polarization scrambling material located along the light pipe opposite the liquid crystal display;
a second polarization scrambling material between the white light emitting diode and the light pipe; and
wherein light from the white light emitting diode enters the light pipe and passes through the diffuser, the reflective polarizer, then backlights the liquid crystal display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification