LED illumination structure without light guide plate

• US 8,545,048 B2
• Filed: 08/30/2011
• Issued: 10/01/2013
• Est. Priority Date: 05/13/2011
• Status: Active Grant

• Current Assignee: Southern Taiwan University
• Original Assignee: Southern Taiwan University
• Inventors: Kang, Chih-Chieh, Lin, Jeng-Feng, Li, Hong-Ze, Tseng, Shih-Fu
• Primary Examiner(s): Lee, Y My Quach
• Application Number:
  US13/221,288
• Publication Number:
  US 20120287626A1
• Time in Patent Office: 763 Days
• Field of Search: 362/241, 362/242, 362/243, 362/244, 362/247, 362/297, 362/341, 362/346, 362/623, 362/624, 362/625
• US Class Current: 362/243
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 3/0043 Inhomogeneous or irregular arrays, e.g. varying shape, size, height
• CPC Class Codes: G02B 3/005 arranged along a single direction only, e.g. lenticular sheets G02B3/0043 takes precedence
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G09F 13/18 Edge-illuminated signs
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 2013/142 multiple reflectors
• CPC Class Codes: G09F 2013/145 curved reflectors
• CPC Class Codes: G09F 2013/222 with LEDs

Abstract

An LED illumination structure without a light guide plate (LGP) includes an optical bottom plate, a plurality of LED illumination components arranged at least along one side edge of the optical bottom plate and a plurality of reflecting structures parallel to the LED illumination components formed on the optical bottom plate from two opposite side edges of the optical bottom plate to a center of the optical bottom plate. The reflecting structures are in a shape of tapered embossment and include a first side facing the center of the optical bottom plate and a second side facing the side edges of the optical bottom plate. An optical film is arranged in a raising direction of the reflecting structures of the optical bottom plate. The present invention is applicable to an illumination lamp for generating a uniform light emitting or may further be an illumination structure for projecting a light source of a bare-eyed 3D image.

Claims

1. An LED illumination structure without a light guide plate (LGP), comprising an optical bottom plate, a plurality of LED illumination components arranged at least along one side edge of the optical bottom plate and a plurality of reflecting structures parallel to the LED illumination components formed on the optical bottom plate from two opposite side edges of the optical bottom plate to a center of the optical bottom plate,

wherein the reflecting structures are in a shape of a tapered embossment and each comprise a first side facing the center of the optical bottom plate and a second side facing the side edges of the optical bottom plate, and an optical film is arranged to oppose a raising direction of the reflecting structures of the optical bottom plate, wherein the center of the optical bottom plate forms a horizontal recess.

2. The LED illumination structure without the LGP of claim 1, wherein the first side of each reflecting structure is a vertical surface and the second side of the reflecting structure is a sloped surface.

3. The LED illumination structure without the LGP of claim 1, wherein the reflecting structures are gradually raised towards the center of the optical bottom plate.

4. The LED illumination structure without the LGP of claim 1, wherein an optical axis direction of the LED illumination components points to the second sides of the reflecting structures.

5. The LED illumination structure without the LGP of claim 1, wherein a half-power angle of radiation of the LED illumination components ranges from 5°

to 15°

.

6. The LED illumination structure without the LGP of claim 1, wherein the optical film is a diffusion sheet.

7. The LED illumination structure without the LGP of claim 6, wherein a reverse prism layer with a zigzag cross-section is arranged on a side of the diffusion sheet facing the optical bottom plate.

8. The LED illumination structure without the LGP of claim 1, wherein the optical bottom plate is in a shape of polygon and the LED illumination components are arranged on the two opposite side edges of the optical bottom plate.

9. The LED illumination structure without the LGP of claim 8, wherein the optical film is a prism, a reverse prism structure with a zigzag cross-section is arranged on the side of the prism facing the optical bottom plate, and the prism has a plurality of arc embossment structures adjacent to one another corresponding to the reverse prism structures.

10. The LED illumination structure without the LGP of claim 1, wherein the optical bottom plate is in a shape of polygon and the LED illumination components are disposed on a periphery of the optical bottom plate.

11. The LED illumination structure without the LGP of claim 1, wherein the optical bottom plate is a round shape and the LED illumination components are disposed on a periphery of the optical bottom plate.

12. The LED illumination structure without the LGP of claim 1, wherein the LED illumination components are arranged in a reflection mask.