LCD backlight with UV light-emitting diodes and planar reactive element
First Claim
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1. A backlight for a liquid crystal display (LCD), comprising:
- a substantially planar waveguide;
a plurality of light-emitting diodes positioned adjacent the waveguide, the plurality of light-emitting diodes emitting light having a first wavelength range; and
a substantially planar reactive element disposed adjacent the waveguide, the reactive element being configured to emit light having a second wavelength range toward the waveguide when the reactive element is excited by light from the plurality of light-emitting diodes;
wherein the plurality of light-emitting diodes is a first plurality of light-emitting diodes positioned along an edge of the waveguide that is substantially parallel to a light output direction of the backlight, and further including a second plurality of light-emitting diodes positioned along the edge of the waveguide, the second plurality of light-emitting diodes emitting visible light.
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Abstract
A backlight for a liquid crystal display includes a substantially planar waveguide and a plurality of light-emitting diodes positioned adjacent the waveguide. The plurality of light-emitting diodes emits light having a first wavelength range. A reactive element is disposed adjacent the waveguide. The reactive element emits light having a second wavelength range toward the waveguide when the reactive element is excited by light from the plurality of light-emitting diodes.
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Citations
11 Claims
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1. A backlight for a liquid crystal display (LCD), comprising:
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a substantially planar waveguide; a plurality of light-emitting diodes positioned adjacent the waveguide, the plurality of light-emitting diodes emitting light having a first wavelength range; and a substantially planar reactive element disposed adjacent the waveguide, the reactive element being configured to emit light having a second wavelength range toward the waveguide when the reactive element is excited by light from the plurality of light-emitting diodes; wherein the plurality of light-emitting diodes is a first plurality of light-emitting diodes positioned along an edge of the waveguide that is substantially parallel to a light output direction of the backlight, and further including a second plurality of light-emitting diodes positioned along the edge of the waveguide, the second plurality of light-emitting diodes emitting visible light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A backlight for a liquid-crystal display, comprising:
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a substantially planar waveguide; a plurality of ultraviolet (UV) light-emitting diodes positioned adjacent the waveguide, wherein the UV light-emitting diodes emit non-visible ultraviolet light; and a substantially planar phosphor element disposed adjacent the waveguide and configured to emit visible light toward the waveguide when non-visible light from the plurality of UV light-emitting diodes is directed thereupon; wherein the plurality of UV light-emitting diodes are positioned along an edge of the waveguide, said edge being parallel to a light output direction of the backlight such that the UV light emitted by the UV light-emitting diodes is directed toward the phosphor element through the waveguide; wherein the plurality of UV light-emitting diodes are configured to be activated during a daytime mode, the backlight further including a plurality of visible light-emitting diodes disposed along an edge of the waveguide and configured to be activated primarily during a night-vision mode; and a filter element disposed between the light-emitting diodes and the waveguide, wherein the filter element is transparent to UV light and to visible light having wavelengths usable in the night-vision mode. - View Dependent Claims (11)
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Specification