Asahi Kasei Kabushiki Kaisha

Other

Physical Optics Corporation

Luminit LLC

Gajendra D. Savant

Ed Kaiser

San Zhuang Wang

Kang S. Lee

Gajendra D Savant

Kang S Lee

Mark Joseph Bennahmias

Jeffrey A Laine

Rick L Shie

Edward M Kaiser

Hollow, cylindrical, seamless metal master for producing seamless diffuser sheets of preselected length and width. Additional aspects of the invention include a hollow cylindrical seamless invertible elastomeric master and method of making the same and an apparatus and process for effecting variable diffuser recording in photosensitive medium.

Seamless master and method of making same

Hollow, cylindrical, seamless metal master for producing seamless diffuser sheets of preselected length and width. Additional aspects of the invention include a hollow cylindrical seamless invertable elastomeric master and method of making the same and an apparatus and process for effecting variable diffuser recording in photosensitive medium.

An LED-based backlighting system that provides excellent brightness and homogeneity suitable for high performance multi-color and high resolution portable displays such as for PDAs and cell phones. Several different but similar embodiments are disclosed. Some are suitable for use with multiple LEDs and some for use with a single LED. In a first such embodiment, multiple LEDs are located adjacent the input edge of a light pipe. The input edge contains fixed pitch grooves to propagate the LED light in a direction that is substantially angled toward the bottom surface of the light pipe along its entire area. The light pipe bottom surface also has grooves for altering the direction of the LED light toward the upper surface of the light pipe where it exits the light pipe toward a viewer. The exterior of the exit surface of the light pipe receives a light shaping diffuser (LSD) and an optical film. The diffuser acts to diffuse and distribute the exiting light at selected horizontal and vertical angles and the optical film shapes. In a second embodiment, a second LSD is positioned above the optical film. In a third embodiment, an LSD strip having a foreshortened LSD is positioned below the light pipe adjacent the input edge to better reduce hot spots near the LEDs.

Backlighting system for displays

Growing community of inventors

Torrance, CA, United States of America

San Zhuang Wang