Dual film light guide for illuminating displays
First Claim
1. A light guide comprising:
- a cover layer having a planar surface;
a film having first and second surfaces, said first surface comprising a plurality of concave surface relief features and said second surface being planar; and
a light guide plate having top and bottom planar surfaces, said light guide plate being thicker than said cover layer;
wherein said film is disposed between said cover layer and said light guide plate,wherein said film is disposed on said light guide plate such that said planar second surface is adjacent said light guide plate and said concave surface relief features of said first surface face away from said light guide plate; and
wherein said cover layer is disposed adjacent said film such that the planar surface of said cover layer and the concave surface features of said film form cavities between said cover layer and said film such that light guided within the cover layer, light guide plate, and film is totally internally reflected from the cavities such that the light is no longer guided in the cover layer, light guide plate, or film.
3 Assignments
0 Petitions
Accused Products
Abstract
A front light guide panel including a plurality of embedded surface features is provided. The front light panel is configured to deliver uniform illumination from an artificial light source disposed at one side of the font light panel to an array of display elements located behind the front light guide while allowing for the option of illumination from ambient lighting transmitted through the light guide panel. The surface embedded surface relief features create air pockets within the light guide panel. Light incident on the side surface of the light guide propagates though the light guide until it strikes an air/light material guide interface at one on the air pockets. The light is then turned by total internal reflection through a large angle such that it exits an output face disposed in front of the array of display elements.
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Citations
24 Claims
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1. A light guide comprising:
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a cover layer having a planar surface; a film having first and second surfaces, said first surface comprising a plurality of concave surface relief features and said second surface being planar; and a light guide plate having top and bottom planar surfaces, said light guide plate being thicker than said cover layer; wherein said film is disposed between said cover layer and said light guide plate, wherein said film is disposed on said light guide plate such that said planar second surface is adjacent said light guide plate and said concave surface relief features of said first surface face away from said light guide plate; and wherein said cover layer is disposed adjacent said film such that the planar surface of said cover layer and the concave surface features of said film form cavities between said cover layer and said film such that light guided within the cover layer, light guide plate, and film is totally internally reflected from the cavities such that the light is no longer guided in the cover layer, light guide plate, or film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification