Light guides and backlight systems incorporating light redirectors at varying densities
First Claim
Patent Images
1. A light guide of a display, comprising:
- a front surface, a rear surface, and at least one edge separating the front and rear surfaces;
a first light introduction position on one of the at least one edge;
a second light introduction position on one of the at least one edge spaced away from the first light introduction position; and
a plurality of geometric light redirectors distributed amongst three regions of one of the front surface and the rear surface of the light guide, wherein a front face of each geometric light redirector intersects with the one of the front surface and the rear surface along an intersection line, the three regions includinga first region including predominantly geometric light redirectors of a first group,a second region including predominantly geometric light redirectors of a second group, anda third region including geometric light redirectors of the first group distributed substantially throughout and geometric light redirectors of the second group distributed substantially throughout, whereinthe intersection line of each geometric light redirector of the first group is substantially perpendicular to a line connecting a midpoint of the intersection line with the first light introduction position, andthe intersection line of each geometric light redirector of the second group is substantially perpendicular to a line connecting a midpoint of the intersection line with the second light introduction position.
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Abstract
Light guides and backlight systems are disclosed that include one or more groups of geometric light redirectors whose density and/or orientation across the surface of a light guide varies to improve light emission uniformity and to reduce visual artifacts.
211 Citations
36 Claims
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1. A light guide of a display, comprising:
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a front surface, a rear surface, and at least one edge separating the front and rear surfaces; a first light introduction position on one of the at least one edge; a second light introduction position on one of the at least one edge spaced away from the first light introduction position; and a plurality of geometric light redirectors distributed amongst three regions of one of the front surface and the rear surface of the light guide, wherein a front face of each geometric light redirector intersects with the one of the front surface and the rear surface along an intersection line, the three regions including a first region including predominantly geometric light redirectors of a first group, a second region including predominantly geometric light redirectors of a second group, and a third region including geometric light redirectors of the first group distributed substantially throughout and geometric light redirectors of the second group distributed substantially throughout, wherein the intersection line of each geometric light redirector of the first group is substantially perpendicular to a line connecting a midpoint of the intersection line with the first light introduction position, and the intersection line of each geometric light redirector of the second group is substantially perpendicular to a line connecting a midpoint of the intersection line with the second light introduction position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A light guide of a display, comprising:
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a first light introduction position on an edge of the light guide, and a plurality of geometric light redirectors distributed across a surface of the light guide for redirecting light introduced at the first light introduction position, wherein the density of geometric light redirectors, beginning at a first distance from the first light introduction position, along at least one direction extending radially from the first light introduction position, decreases in a gradual fashion. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A light guide of a display, comprising:
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a front surface, a rear surface, and at least first, second, and third edges separating the front and rear surfaces; at least one light introduction position on the first edge; reflective surfaces positioned proximate the second and third edges and directed towards an interior of the light guide; a plurality of first geometric light redirectors distributed across one of the front surface and the rear surface, wherein a front face of each first geometric light redirector is oriented substantially towards the first edge, a plurality of second geometric light redirectors distributed across the one of the front surface and the rear surface, wherein a front face of each second geometric light redirector is oriented at least partially towards one of the second and third edges. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification