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Front illumination device comprising a film-based lightguide

A light guide and light source technology, applied in lighting devices, parts of lighting devices, light guides, etc.

Inactive Publication Date: 2013-04-10
FLEX LIGHTING II
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When fabricated, thin lightguides are limited by the rigid wafer of the monolithic optical assembly

Method used

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  • Front illumination device comprising a film-based lightguide
  • Front illumination device comprising a film-based lightguide
  • Front illumination device comprising a film-based lightguide

Examples

Experimental program
Comparison scheme
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Embodiment

[0934] Certain embodiments are illustrated in the following examples. The following examples are given for illustrative purposes only, and do not limit the scope or spirit of the invention.

[0935] In one embodiment, the coupling lightguides are formed by cutting strips at one or more ends of the film forming the coupling lightguides (strips) and the lightguide region (remainder of the film). On the free end of the strip, the strip is bundled together into an arrangement, the strip being thicker than the thickness of its membrane. On the other end, they are still physically and optically attached and aligned to the larger film lightguide. Film cuts are obtained by stamping, laser cutting, mechanical cutting, water jet cutting, local melting or other film processing methods. Preferably, the cutting results in an optically smooth surface to facilitate total internal reflection of light, thereby improving guiding light through the length of the strip. A light source is couple...

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Abstract

A reflective display includes a reflective spatial light modulator and a frontlight. The frontlight includes a lightguide formed from a film. The lightguide includes an array of coupling lightguides continuous with a lightguide region of the lightguide. One or more light sources emit light into the array of coupling lightguides. Light from each coupling lightguide combines and totally internally reflects within the lightguide region. Light extraction features frustrate totally internally reflect light within the lightguide region such that the light exits the lightguide toward the reflective spatial light modulator in a light emitting region of the film. A cladding region is optically coupled to the lightguide so light from the light source propagates into the cladding region. A light extracting region is operatively coupled to the cladding region opposite the lightguide, and light in the cladding region is extracted. A method of producing a display is also disclosed.

Description

[0001] Cross References to Related Applications [0002] This application requests U.S. Provisional Application No. 61 / 325,266, filed April 16, 2010, entitled "Replaceable illuminated signage system for cooler doors"; "; U.S. Provisional Application No. 61 / 325,252, filed April 16, 2010, entitled "Processing method for optical film lightguide and coupling system"; U.S. Provisional Application No. 61 / 325,269, filed April 16, 2010 U.S. Provisional Application No. 61 / 325,271 titled "Method and apparatus for aligning lightguides in a coupling system"; U.S. Provisional Application titled "Center aligned lighting configuration for ultra-thin LED backlight system for LCDs" filed April 16, 2010 No. 61 / 325,272; U.S. Provisional Application No. 61 / 325,275, filed April 16, 2010, entitled "Low profile batterypowered lightguide"; filed April 16, 2010, entitled "Method and apparatus for enhanced LCD backlight U.S. Provisional Application No. 61 / 325,277 for "; U.S. Provisional Application No. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V7/04F21Y101/00
CPCG02B6/002G02B6/0028G02B6/0076G02B27/0101G02B6/003G02B6/005G02B6/0065G02B6/0068G02B6/0088G09F13/18G02B6/006Y10T29/49826G02B6/0018G02F1/133616H01L31/125G02B6/0053
Inventor A·J·尼科尔Z·科尔曼
Owner FLEX LIGHTING II
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