Flat panel display light guide

• US 6,336,728 B1
• Filed: 08/22/2000
• Issued: 01/08/2002
• Est. Priority Date: 08/22/2000
• Status: Expired due to Term

• Current Assignee: Rockwell Collins, Inc. (Rtx Corporation)
• Original Assignee: Rockwell Collins, Inc. (Rtx Corporation)
• Inventors: Deloy, Christian T.
• Primary Examiner(s): Husar, Stephen
• Assistant Examiner(s): Zeade, Bertrand
• Application Number:
  US09/643,377
• Time in Patent Office: 504 Days
• Field of Search: 362/31, 362/260, 362/554, 362/556, 362/558, 362/553, 362/561, 362/29, 362/311, 362/249, 362/240, 362/237, 362/241, 349/62, 349/65, 349/63, 349/70
• US Class Current: 362/614
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses

Abstract

A luminaire for back lighting a flat panel display in accordance with the present invention includes a fluorescent lamp having multiple lamp sections and a stack of optical components. A light guide is positioned between the fluorescent lamp and the stack of optical components. The light guide includes a first section extending across a width of the luminaire which separates the multiple lamp sections from the stack of optical components and which is adapted to substantially uniformly distribute light from the multiple lamp sections toward the stack of optical components. The light guide also includes multiple leg sections each adapted to protrude from the first section of the light guide to positions between adjacent lamp sections or to positions between one of the lamp sections and a side wall. The multiple leg sections of the light guide redirect light from the lamp sections into the first section of the light guide.

Claims

1. A luminaire for backlighting a flat panel display, the luminaire comprising:

a fluorescent lamp having a plurality of lamp sections;

a stack of optical components; and

a light guide positioned between the fluorescent lamp and the stack of optical components, the light guide comprising;

a first section extending across a width of the luminaire separating the plurality of lamp sections from the stack of optical components and adapted to substantially uniformly distribute light from the plurality of lamp sections toward the stack of optical components; and

a plurality of leg sections, wherein each of the plurality of leg sections protrudes from the first section of the light guide to positions between adjacent ones of the plurality of lamp sections or to positions between one of the lamp sections and a side wall, the plurality of leg sections being adapted to redirect light from the leg sections of the fluorescent lamp into the first section of the light guide.

2. The luminaire of claim 1, wherein the plurality of lamp sections of the fluorescent lamp include a plurality of straight lamp sections.

3. The luminaire of claim 1, wherein the fluorescent lamp is a serpentine lamp.

4. The luminaire of claim 1, wherein the stack of optical components includes a diffuser positioned adjacent the light guide such that the light guide substantially uniformly distributes light from the plurality of lamps sections toward the diffuser.

5. The luminaire of claim 4, wherein the first section of the light guide includes a substantially planar portion extending across the width of the luminaire.

6. The luminaire of claim 5, wherein the diffuser is a substantially planar diffuser supported by the substantially planar portion of the light guide.

7. The luminaire of claim 1, wherein the light guide is formed of an acrylic material.

8. A light guide for use in a luminaire for back lighting a flat panel display, the luminaire including a fluorescent lamp having a plurality of lamps sections and a stack of optical components, the light guide comprising:

a first section adapted to extend across a width of the luminaire to separate the plurality of lamps sections of the fluorescent lamp from a stack of optical components and adapted to substantially uniformly distribute light from the plurality of lamp sections toward the stack of optical components; and

a plurality of legs sections, wherein each of the plurality of leg sections is adapted to protrude from the first section of the light guide to positions between adjacent ones of the plurality of lamp sections or to positions between one of the lamp sections and a side wall of the luminaire, the plurality of leg sections being adapted to redirect light from the lamp sections into the first section of the light guide.

9. The light guide of claim 8, wherein the first section includes a substantially planar section adapted to extend across the width of the luminaire to separate the plurality of lamp sections from the stack of optical components and to substantially uniformly distribute light from the plurality of lamp sections toward the stack of optical components.

10. The light guide of claim 9, wherein the substantially planar section provides a substantially planar surface adapted to support a diffuser in the flat panel display.

11. The light guide of claim 10, wherein the plurality of leg sections of the light guide extend generally from the first section of the light guide in a direction which is approximately perpendicular to the substantially planar surface.

12. The light guide of claim 11, wherein the first section and the plurality of leg sections form a plurality of substantially arcuate surfaces adapted to be positioned around the plurality of lamp sections.

13. The light guide of claim 12, wherein the first section and the plurality of leg sections of the light guide are formed from an acrylic material.

14. The light guide of claim 12, wherein the first section and the plurality of leg sections of the light guide are formed from a plastic material.

15. The light guide of claim 12, wherein the first section and the plurality of leg sections of the light guide are formed from a polycarbonate material.