LIGHT GUIDES AND BACKLIGHT SYSTEMS INCORPORATING PRISMATIC STRUCTURES AND LIGHT REDIRECTORS
First Claim
Patent Images
1. A display apparatus comprising;
- an array of light modulators defining a display surface;
a light guide having front and rear surfaces and a plurality of geometric light redirectors;
a rear-facing plurality of prisms,a front-facing plurality of prisms, wherein each of the rear-facing and front-facing plurality of prisms is located between the light guide and the display surface, and wherein an apex angle of one of the rear-facing plurality of prisms and the front-facing plurality of prisms is less than or equal to about 75 degrees or greater than or equal to about 105 degrees.
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Abstract
Apparatus and method for collecting and directing light from a source via a light guide and modulated display assembly in an efficient manner through the design and use of prismatic optical structures, diffusers and/or light redirectors. The prismatic optical structures may include a plurality of rear-facing prisms and/or front-facing prisms, each with an associated prism apex angle. The prism apex angle for each of the prisms may be selected such that on-axis brightness intensity and/or total optical power extraction of the display are improved.
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Citations
22 Claims
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1. A display apparatus comprising;
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an array of light modulators defining a display surface; a light guide having front and rear surfaces and a plurality of geometric light redirectors; a rear-facing plurality of prisms, a front-facing plurality of prisms, wherein each of the rear-facing and front-facing plurality of prisms is located between the light guide and the display surface, and wherein an apex angle of one of the rear-facing plurality of prisms and the front-facing plurality of prisms is less than or equal to about 75 degrees or greater than or equal to about 105 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of forming an image using a display apparatus comprising:
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providing an array of light modulators, which defines a display surface, in proximity to an illumination system including a front-facing plurality of prisms, a rear-facing plurality of prisms, wherein an apex angle of one of the rear-facing plurality of prisms and the front-facing plurality of prisms is less than or equal to about 75 degrees or greater than or equal to about 105 degrees, and a light guide positioned behind the rear-facing plurality of prisms, the light guide having front and rear surfaces and a plurality of geometric light redirectors formed therein; providing one or more light sources configured to illuminate the light redirectors, reflecting light off the plurality of light redirectors to within a useful range of angles about a display axis perpendicular to the display surface; and redirecting the light reflected into the useful range of angles by the light redirectors towards the display surface, by both of the front-facing plurality of prisms and rear-facing plurality of prisms, such that the reflected light remains within the same useful range of angles. - View Dependent Claims (22)
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Specification