# US 7,303,309 B2 · Method and apparatus for backlit signs with light emitting diode modules

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- Number: US 7,303,309 B2
- Document ID: US7303309B2
- Status: Granted
- Kind: B2
- Application number: 10/886,798
- Filed: 2004-07-06
- Published: 2005-02-24
- Granted: 2007-12-04
- Earliest claimed: 2002-10-08
- Assignees: Leotek Electronics Corporation
- Inventors: Chen H. Wu; Steve Bacilieri
- Web page: https://patentgrep.com/patent/US7303309B2

## CPC

- G09F 13/22: electroluminescent (electroluminescent light sources per se H05B33/00)
- F21K 9/00: Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- Y10S 362/80: Light emitting diode
- Y10S 362/812: Signs
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A backlit sign with an LED module, with a housing that includes a top wall having a first length, a bottom wall having a second length, and a pair of opposing sidewalls each having a third length, wherein at least a portion of one of the sidewalls is translucent. One or more LED modules are mounted to the top wall and include a plurality of LEDs for producing light. The first, second and third lengths are selected to maximize illumination of the sidewalls by the produced light, and to minimize a width and weight of the sign. A mirror can be used to increase the reflectivity of the bottom wall.

## Claims

### Claim 1

An illuminated sign comprising:
a hollow housing that includes:
a top wall having a first length,
a bottom wall having a second length, and
a pair of opposing sidewalls each having a third length, wherein at least a portion of one of the sidewalls is translucent;
a first LED module disposed in the housing and mounted to the top wall and including a plurality of LEDs for producing light; and
an optical lens disposed over the LED module for focusing the light produced by the LEDs;
wherein the first, second and third lengths are selected to maximize illumination of the sidewalls by the produced light, and to minimize a width and weight of the sign; and
wherein:
the top wall includes first and second portions that are not coplanar with each other;
the first LED module is mounted to the top wall first portion; and
the sign further comprising a second LED module mounted to the top wall second portion and having a plurality of LEDs for producing light.

### Claim 2 (depends on 1)

The illuminated sign of claim 1, further comprising:
a mirror mounted to the bottom wall for reflecting the light produced by the first and second LED modules.