Compact LCD luminaire

• US 4,974,122 A
• Filed: 03/28/1989
• Issued: 11/27/1990
• Est. Priority Date: 03/28/1989
• Status: Expired due to Term

• Current Assignee: Rockwell International Corporation
• Original Assignee: Rockwell International Corporation
• Inventors: Shaw, James E.
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/330,393
• Time in Patent Office: 609 Days
• Field of Search: 362/31, 362/32, 362/26, 362/27, 362/216, 362/223, 362/260, 362/327, 362/307, 362/244, 362/245, 362/246, 362/29, 362/30, 362/268, 362/331, 362/332, 40/546, 40/547, 350/345, 350/330
• US Class Current: 362/615
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0071 with elongated shape, e.g. tube
• CPC Class Codes: G09F 13/0409 Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency arrangements of reflectors G09F13/14

Abstract

A compact backlighting luminaire is provided for liquid crystal displays (LCDs). The body of the luminaire is formed of optically clear glass or acrylic resins. The body comprises a mesa extending from a base comprising a flange extending around the periphery of the mesa. The top of the mesa comprises at least two non-parallel sloped surfaces. The base of the luminaire body may form a wedge with the flange being thicker at one edge than at an opposite edge. The bottom surface and edges of the body may be coated with a reflective film. A fluorescent lamp extends around the periphery of the mesa and is supported by the flange. A cover may be provided to extend over the mesa and around the periphery of the flange to secure the lamp, to reduce illumination losses, and to provide a mounting surface for an LCD. Light from the lamp is reflected by the bottom and edge surfaces of the body and is incident on the sloped top surfaces of the mesa to provide uniform backlighting illumination for and LCD mounted atop the cover of the luminaire. The luminaire provides effective backlighting for full color flat panel displays without adding significantly to the depth dimension of the flat panel display.

Claims

1. A luminaire for a liquid crystal display (LCD), comprising:

a body of optically clear material having a mesa and a base, said base forming a flange extending around said mesa;

a light source extending at least substantially halfway around said mesa;

said mesa having at least two joining, non-parallel upper surface for emitting light from said body; and

a cover having a top forming a plane surface extending above said mesa and said light source, and having sides extending substantially perpendicular to said top and extending around said flange.