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, the plurality of geometric light redirectors being arranged to reflect light into a useful range of angles about a display axis perpendicular to the display surface, the light originating from one or more light sources;
a rear-facing plurality of prisms;
a front-facing plurality of prisms; and
each of the rear-facing and front-facing plurality of prisms being located between the light guide and the display surface while being arranged to redirect the reflected light from the geometric light redirectors towards the display surface such that the reflected light remains within the useful range of angles, wherein the light is reflected such that the intensity of the redirected light within the useful range of angles about the display axis is at least 50% of an initial total light intensity.
2 Assignments
0 Petitions
Accused Products
Abstract
Improved 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.
-
Citations
26 Claims
-
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, the plurality of geometric light redirectors being arranged to reflect light into a useful range of angles about a display axis perpendicular to the display surface, the light originating from one or more light sources; a rear-facing plurality of prisms; a front-facing plurality of prisms; and each of the rear-facing and front-facing plurality of prisms being located between the light guide and the display surface while being arranged to redirect the reflected light from the geometric light redirectors towards the display surface such that the reflected light remains within the useful range of angles, wherein the light is reflected such that the intensity of the redirected light within the useful range of angles about the display axis is at least 50% of an initial total light intensity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 22, 23, 24)
-
-
15. A method of forming an image comprising:
-
providing an array of light modulators, which defines a display surface, in proximity to an illumination system including a front-facing prism sheet, a rear-facing prism sheet and a light guide positioned behind the rear-facing prism sheet, 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; redirecting the light reflected into the useful range of angles by the light redirectors towards the display surface, by both of the front- and rear-facing prism sheets, such that the reflected light remains within the same useful range of angles; and wherein the light is reflected such that the intensity of the redirected light within the useful range of angles about the display axis is at least 50% of an initial total light intensity. - View Dependent Claims (16, 17, 18, 19, 20, 21, 25, 26)
-
Specification