Backlit liquid crystal display with integral collimating, refracting, and reflecting means which refracts and collimates light from a first light source and reflects light from a second light source
First Claim
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1. A backlighting system for a liquid crystal display, comprising:
- a first light source for emitting high intensity light;
a second light source for emitting low intensity light;
an integral collimating, reflecting, and image splitting means for;
i) collimating light from said first light source;
ii) refracting light from said first light source to provide two similar images thereof; and
iii) reflecting light rays from said second light source and redirecting said rays from said second light source toward said liquid crystal display; and
wherein said first light source is located on a first side of said integral collimating, reflecting, and image splitting means which is opposite a viewer, and said second light source directs its light rays toward said integral collimating, reflecting, and image splitting means from a second side of said integral means opposite said first side.
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Abstract
An improved NVG compatible day/night backlighting assembly for a color liquid crystal display includes a daytime high intensity light source, an edge-mounted nighttime low intensity light source, and an integral collimating/reflecting/image splitting lens which collimates and image splits the light emitted from the high intensity daytime light source, and reflects upward the low intensity light rays emanating from the low intensity edge-mounted light source.
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Citations
12 Claims
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1. A backlighting system for a liquid crystal display, comprising:
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a first light source for emitting high intensity light; a second light source for emitting low intensity light; an integral collimating, reflecting, and image splitting means for; i) collimating light from said first light source; ii) refracting light from said first light source to provide two similar images thereof; and iii) reflecting light rays from said second light source and redirecting said rays from said second light source toward said liquid crystal display; and wherein said first light source is located on a first side of said integral collimating, reflecting, and image splitting means which is opposite a viewer, and said second light source directs its light rays toward said integral collimating, reflecting, and image splitting means from a second side of said integral means opposite said first side. - View Dependent Claims (2)
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3. In a backlit liquid crystal display which includes:
- a first light source for emitting high intensity light activated for daylight viewing of the display;
a second light source for emitting low intensity light for viewing in darkened conditions when said first light source is deactivated; and
means for diffusing said high and low intensity light wherein said diffusing means is operatively disposed between a matrix array of liquid crystal picture elements and said first and second light sources;
said liquid crystal display being capable of providing an image to a remotely positioned observer, the improvement comprising;an integral collimating, reflecting, and image splitting means, fixedly mounted between said diffusing means and said first light source, for; i) collimating light from said first light source; ii) refracting light rays emanating from said first light source to provide two similar images thereof; and iii) reflecting light rays emanating from said second light source and redirecting said rays upward and through said diffusing means and into said matrix array of liquid crystal picture elements; thereby enlarging the area effectively illuminated by said first and second light sources, whereby a uniform light distribution is provided in a low profile assembly. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
- a first light source for emitting high intensity light activated for daylight viewing of the display;
Specification