High brightness diffuser

• US 7,006,293 B2
• Filed: 03/31/2004
• Issued: 02/28/2006
• Est. Priority Date: 08/29/2003
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lee, Chih-Kung, Wen, Chun-Hsiang, Kuo, Hui-Lung, Wu, Yaw-Ting, Wu, Yu-Hsun, Tsai, Ming-Lang
• Primary Examiner(s): Nguyen, Thong Q
• Application Number:
  US10/813,111
• Publication Number:
  US 20050046949A1
• Time in Patent Office: 699 Days
• Field of Search: 359/599, 359/707, 359455-460, 359831-837, 362/29, 362/31, 349 49- 57
• US Class Current: 359/599
• CPC Class Codes: G02B 5/0215 the surface having a regular structure
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0242 by means of dispersed particles
• CPC Class Codes: G02B 5/0278 used in transmission

Abstract

A solution for fabricating a light diffusing sheet-like device capable of emitting light with superior brightness, that is a high brightness diffuser. The high brightness diffuser mainly includes at least two light diffusing pieces with ridge-shape structure arranged thereon, which can be either convex or concave. The convex ridge-shape structure having a plurality of large convex ridges and a plurality of small convex ridges, which are associated with a ridgeline existing in between two adjacent ridges where the large ridge and small are interlace-arranged, and the ridges along with the associated ridgelines can be longitudinally extended to the same direction. The concave ridge-shape structure is constituted the same way as the convex ridge-shape structure is, but having concave ridges. The high brightness diffuser is fabricated by stacking up the two light diffusing pieces and enabling an included angle to be formed between the two ridge-extending directions of the two light diffusing pieces.

Claims

1. A high brightness diffuser, comprising:

a convex light diffusing piece with ridge-shaped structure arranged on a surface thereof, being consisted of a plurality of large convex ridges and a plurality of small convex ridges, wherein each of the convex ridges has a ridgeline, and the large ridge and small ridge are interlace-arranged, and the plural ridges along with the associated ridgelines are extending toward a same direction;

a concave light diffusing piece with ridge-shaped structure arranged on a surface thereof, being consisted of a plurality of concave ridges associated with a ridgeline existing in between two adjacent ridges, wherein the plural ridges along with the associated ridgelines are extending toward a same direction; and

wherein, the two light diffusing pieces are stacked up by plastering the surface with ridge-shaped structure of the convex light diffusing piece on the surface without ridge-shaped structure of the concave light diffusing piece, and enabling an included angle to be formed between the two ridge-extending directions of the two light diffusing pieces.

2. The high brightness diffuser of claim 1, wherein the included angle is 45°

.

3. The high brightness diffuser to claim 1, wherein, with an inter-ridge distance being defined as the distance between the ridgelines of the two adjacent large ridges, and a ridge height being defined as the difference of altitude between the ridgeline and the line separating the large ridge and the small ridge, the inter-ridge distances are equal to each other and the ridge heights are equal to each other.

4. The high brightness diffuser to claim 1, wherein, with an inter-ridge distance being defined as the distance between the ridgelines of the two adjacent small ridges, and a ridge height being defined as the difference of altitude between the ridgeline and the line separating the large ridge and the small ridge, the inter-ridge distances are equal to each other and the ridge heights are equal to each other.

5. The high brightness diffuser to claim 1, wherein, with an inter-ridge distance being defined as the distance between the ridgelines of the two adjacent concave ridges, and a ridge height being defined as the difference of altitude between the ridgeline and the bottom line of the concave ridge, the inter-ridge distances are equal to each other and the ridge heights are equal to each other.

6. The high brightness diffuser to claim 1, wherein both the convex light diffusing piece and the concave light diffusing piece further comprise respectively a substrate, a ridge-shaped layer and a diffusion layer consisted of a thin transparent layer having a rugged external surface and numerous light diffusing particles uniformly dispersed within the thin transparent layer, and the substrate is sandwiched in between the ridge-shaped layer and the diffusion layer.

7. The high brightness diffuser to claim 1, wherein both the convex light diffusing piece and the concave light diffusing piece further comprise respectively a substrate, a ridge-shaped layer and a diffusion layer consisted of a thin transparent layer having a rugged external surface and numerous light diffusing particles uniformly dispersed within the thin transparent layer, and the diffusion layer is sandwiched in between the ridge-shaped layer and the substrate.

8. The high brightness diffuser to claim 1, wherein the convex light diffusing piece further comprises a substrate, a ridge-shaped layer and a diffusion layer consisted of a thin transparent layer having a rugged external surface and numerous light diffusing particles uniformly dispersed within the thin transparent layer, and the diffusion layer is sandwiched in between the ridge-shaped layer and the substrate.