Multilayered integrated backlight illumination assembly

• US 20090180282A1
• Filed: 01/15/2008
• Published: 07/16/2009
• Est. Priority Date: 01/15/2008
• Status: Active Grant

• Current Assignee: SKC Hi-Tech & Marketing Co., Ltd.
• Original Assignee: Rohm and Haas Denmark Finance A/S (Dow, Inc.)
• Inventors: Brewer, John C., Hong, Qi, Bourdelais, Robert P., Aylward, Peter T.
• Granted Patent: US 7,845,826 B2
• Time in Patent Office: Days
• US Class Current: 362/245
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area
• CPC Class Codes: G02B 6/0078 Side-by-side arrangements, e.g. for large area displays
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

The present invention provides a multilayered 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 and a plurality of solid state light sources provided in an opening of the bottom reflector for providing a point light source. The invention further provides a plurality of primary light films 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 plurality of secondary light films 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 and a binding means for binding the primary and secondary light films together. Further, the invention provides a top diffuser for diffusing the uniform plane of light and wherein the plurality of light films has a thickness between 0.1 mm to 1.0 mm and a bending stiffness between 50 to 1200 millinewtons.

Claims

1. A multilayered 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 primary light films 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 plurality of secondary light films 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 binding means for binding the primary and secondary light films together;

a top diffuser for diffusing the uniform plane of light; and

wherein the plurality of light films has a thickness between 0.1 mm to 1.0 mm and a bending stiffness between 50 to 1200 millinewtons.

2. The backlight illumination assembly of claim 1 further comprising a heat sink for the plurality of solid state light sources.

3. The backlight illumination assembly of claim 1 further comprising a plurality of multi-colored solid state light sources provided in the opening of the bottom reflector for providing a secondary point light source.

4. The backlight illumination assembly of claim 1 further comprising a trichromatic sensor to correct or adjust both the luminance and color of the point light source.

5. The backlight illumination assembly of claim 1 wherein an end of the light redirecting area has a chamfered edge to aid in the spread of the point light source.

6. The backlight illumination assembly of claim 1 further comprising a trench provided between the light redirecting areas to reduce light leakage between the light redirecting areas.

7. The backlight illumination assembly of claim 6 wherein the trenches of the primary light films are offset from the secondary light films.

8. The backlight illumination assembly of claim 1 further comprising a patterned diffuser area in the top diffuser film.

9. A multilayered 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 primary light films 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 plurality of secondary light films 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 polymer layer with beads provided between the primary and secondary light films to adhere the films together;

a top diffuser for diffusing the uniform plane of light; and

wherein the plurality of light films has a thickness between 0.1 mm to 1.0 mm and a bending stiffness between 50 to 1200 millinewtons.

10. A multilayered 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 multi-colored solid state light sources provided in an opening of the bottom reflector for providing a red, green or blue point light source;

a plurality of primary light films having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading any of the red, green or blue point light source to a uniform plane of light;

a plurality of secondary light films having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading any of the red, green or blue point light source to a uniform plane of light;

a plurality of tertiary light films having light redirecting areas provided between the plurality of solid state light sources for redirecting and spreading any of the red, green or blue point light source to a uniform plane of light;

an adhesive pad provided between the primary, secondary and tertiary light films to adhere the films together;

a plurality of color mixing sections provided in the light redirecting areas for providing improved color uniformity from the multi-colored solid state light sources;

a top diffuser for diffusing the uniform plane of light; and

wherein the plurality of light films has a thickness between 0.1 mm to 1.0 mm and a bending stiffness between 50 to 1200 millinewtons.