Beam shaping method and apparatus
First Claim
1. A projection arrangement comprising:
- at least one microdisplay;
at least one light source; and
at least one cylindrical optical surface arranged between the at least one light source and the at least one microdisplay, which cylindrical optical surface changes the aspect ratio of the illumination to match to the shape of the microdisplay.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical device includes a source such as an LED, a microdisplay such as an LCoS panel, and one or more cylindrical lens surfaces that (in combination if more than one) changes the aspect ratio of light emanating from the source to the aspect ratio of the microdisplay without clipping. The cylindrical optical surface defines parallel cross sections, each of which define a center of curvature such that the centers of curvatures together define a line that crosses an optical axis between the microdisplay and the source, or an extension or that axis. Changing the aspect ratio in this manner preserves total luminance since clipping is not used to change the aspect ratio, and provides a substantially uniform illumination across the new aspect ratio. Also detailed is a method and further details of an exemplary pocket sized optical engine for which the output of the microdisplay is directed to a projection lens.
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Citations
25 Claims
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1. A projection arrangement comprising:
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at least one microdisplay; at least one light source; and at least one cylindrical optical surface arranged between the at least one light source and the at least one microdisplay, which cylindrical optical surface changes the aspect ratio of the illumination to match to the shape of the microdisplay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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illumination means comprising a first aspect ratio; display means comprising a second aspect ratio; and lens means disposed between the display means and the illumination means, the lens means having an arcuate surface that is shaped for changing an aspect ratio of illumination emanating from the illumination means from the first aspect ratio to the second aspect ratio without clipping the emanating illumination. - View Dependent Claims (17, 18)
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19. A method for manipulating light comprising:
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emanating light from a source having a first aspect ratio; passing the emanated light through at least one cylindrical optical surface that is shaped to change the emanated light from the first aspect ratio to a second aspect ratio without clipping the emanated light; and
thereafter directing the emanated light to a microdisplay surface having the second aspect ratio. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification