Optical element for lateral light spreading in back-lit displays and system using same
First Claim
1. An optical system, comprising:
- an image-forming panel;
at least a first light source disposed behind the image-forming panel; and
in order from the first light source towards the image-forming panel, a first diffuser, a first multilayer reflector and a second diffuser, at least some light from the first light source passing through the first diffuser, the first multilayer reflector and the second diffuser towards the image-forming panel, an intensity profile of light that has passed out of the second diffuser from the first light source having a minimum at a position along an axis from the first light source normal to a major surface of the first multilayer reflector.
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Accused Products
Abstract
A display system has a controlled transmission mirror disposed between the light sources and the display panel. The controlled transmission mirror includes a light-diverting input coupling element facing the light sources, a light-diverting output coupling element facing the display panel and a multilayer reflector between the input and output coupling elements. The controlled transmission mirror laterally spreads the light, making the illumination of the panel more uniform. The controlled transmission mirror may include a transparent substrate between the input and output coupling elements for additional light spreading. The light sources may be positioned within the controlled transmission mirror, rather than behind it. The output coupling element can be insensitive to polarization, so the light passing out of the controlled transmission mirror is unpolarized, or the output coupling element can be polarization sensitive so that the output light is polarized.
74 Citations
10 Claims
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1. An optical system, comprising:
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an image-forming panel; at least a first light source disposed behind the image-forming panel; and in order from the first light source towards the image-forming panel, a first diffuser, a first multilayer reflector and a second diffuser, at least some light from the first light source passing through the first diffuser, the first multilayer reflector and the second diffuser towards the image-forming panel, an intensity profile of light that has passed out of the second diffuser from the first light source having a minimum at a position along an axis from the first light source normal to a major surface of the first multilayer reflector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification