Light emitting diode (LED) device and method of making same

• US 20050286124A1
• Filed: 09/02/2005
• Published: 12/29/2005
• Est. Priority Date: 01/17/2001
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Everaerts, Albert I., Ma, Jiaying, Zhou, Zhiming, Moshrefzadeh, Robert S.
• Granted Patent: US 7,405,857 B2
• Time in Patent Office: Days
• US Class Current: 359/443
• CPC Class Codes: G03B 21/60 characterised by the nature of the surface
• CPC Class Codes: G03B 21/602 Lenticular screens G03B21/625 takes precedence
• CPC Class Codes: G03B 21/62 Translucent screens
• CPC Class Codes: G03B 21/625 Lenticular translucent screens

Abstract

A light managing screen may provide a rear projection screen, front projection screen or component thereof. The screen may comprise a polymeric composition including a first polymeric material, and a second polymeric material disposed as a plurality of elongated structures within the first polymeric material. Each elongated structure has a major axis and the major axes are substantially aligned. The first polymeric material has an index of refraction that differs by at least 0.01 from an index of refraction of the second polymeric material. In some instances, a pressure sensitive adhesive material is selected as the first polymeric material. The orientation of the elongated structures and the difference in indices of refraction results in the polymeric composition scattering light asymmetrically.

Claims

1-20. -20. (canceled)

21. An optical device, comprising:

a light emitting diode (LED) in which light can be trapped by total internal reflection; and

an adhesive film positioned on a portion of the LED to extract light therefrom.

31. A method of making a light emitting diode (LED) device, comprising:

providing an LED in which light can be trapped by total internal reflection;

forming an adhesive film; and

positioning the film on a portion of the LED to extract light therefrom.