Backlight illumination assembly having a joining clip with diffusion means

• US 8,047,669 B2
• Filed: 07/31/2009
• Issued: 11/01/2011
• Est. Priority Date: 07/31/2009
• Status: Expired due to Fees

• Current Assignee: SKC Hi-Tech & Marketing Co., Ltd.
• Original Assignee: SKC Haas Display Films Co., Ltd. (Dow, Inc.)
• Inventors: Brewer, John C., Hong, Qi, Bourdelais, Robert P., Gates, Leonard S., Rankin, Charles M. Jr.
• Primary Examiner(s): MAY, ROBERT J
• Application Number:
  US12/462,287
• Publication Number:
  US 20110026274A1
• Time in Patent Office: 823 Days
• Field of Search: 362612-613, 362/97.3, 362/249.02, 362/634, 346 62- 65, 346/69
• US Class Current: 362/97.3
• CPC Class Codes: G02B 6/0025 Diffusing sheet or layer; Prismatic sheet or layer
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0078 Side-by-side arrangements, e.g. for large area displays
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

A uniform light source having a substrate for providing structural and functional support to the assembly. A bottom reflector provided on the substrate. A plurality of solid state light sources provided in an opening of the bottom reflector for providing a point light source. A plurality of light films and having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading the point light source to a uniform plane of light; a joining clip comprising a top capping portion and a bottom support portion, the bottom support portion being aligned perpendicular to the top capping portion and having a height sufficient to house the plurality of light films. A top diffuser for diffusing the uniform plane of light. The plurality of light films has a thickness between 0.1 mm to 1.0 mm. In addition, the joining clip further comprises a light diffusion means.

Claims

1. An integrated backlight illumination assembly for an LCD display comprising:

a substrate for providing structural and functional support to the assembly;

a bottom reflector provided on the substrate;

a plurality of solid state light sources provided in an opening of the bottom reflector for providing a point light source;

a plurality of light films and having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading the point light source to a uniform plane of light;

a joining clip comprising a top capping portion and a bottom support portion, the bottom support portion being aligned perpendicular to the top capping portion and having a cavity housing the plurality of solid state light sources and wherein the joining clip further comprises a height between the top capping portion and the bottom support portion housing the plurality of light films;

a top diffuser for diffusing the uniform plane of light;

the plurality of light films has a thickness between 0.1 mm to 1.0 mm; and

wherein the joining clip has a light diffusion means; and

wherein the joining clip further comprises polymer beads having a core and a shell wherein the index of refraction difference between the core and shell is between 0.02 and 0.20.

2. The backlight illumination assembly of claim 1 wherein the height between the top capping portion and the bottom support portion is between 1.3 and 5 mm.

3. The backlight illumination assembly of claim 1 wherein the joining clip comprises materials selected from polycarbonate, polymethyl methacrylate (PMMA), polystyrene, urethane, polypropylene, polysulfone and nylon.