Electroluminescent display with brightness enhancement
First Claim
1. A backlit display comprising:
- a case having an optical window and an axis;
an electroluminescent panel in said case;
a structured surface material between said electroluminescent panel and said optical window, said structured surface material having the property that light entering it while making an angle in a first predetermined group of angles with said axis will be reflected and light entering it while making an angle in a second predetermined group of angles with said axis will be refracted such that the majority of the light in said second group of angles will form an output wedge that is narrow than said output wedge'"'"'s associated input wedge, said angles in said second group of angles being greater than said angles in said first group of angles; and
a light gating means between said structured surface material and said optical window.
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Accused Products
Abstract
A backlight display includes a case having an optical window through which displayed information may be viewed. In addition it includes an electroluminescent panel for providing the backlight. It further includes a structured surface material between the electroluminescent panel and the optical window. The structured surface material has the property of reflecting light entering it while making an angle in a first predetermined group of angles with the axis of the display back to the electroluminescent panel. It further has the property of refracting light entering it while making an angle in a second predetermined group of angles to the axis of the display such that a majority of the light in the second group will exit in an output wedge that is smaller than the input wedge.
110 Citations
10 Claims
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1. A backlit display comprising:
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a case having an optical window and an axis; an electroluminescent panel in said case; a structured surface material between said electroluminescent panel and said optical window, said structured surface material having the property that light entering it while making an angle in a first predetermined group of angles with said axis will be reflected and light entering it while making an angle in a second predetermined group of angles with said axis will be refracted such that the majority of the light in said second group of angles will form an output wedge that is narrow than said output wedge'"'"'s associated input wedge, said angles in said second group of angles being greater than said angles in said first group of angles; and a light gating means between said structured surface material and said optical window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification