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US 7,802,894 B2Granted
Direct type back light unit for liquid crystal display device
AssigneeLG Display Co., Ltd.
InventorsMan Hoan Lee, Sung Keun Lee
Life of this patent
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Abstract
A back light unit for a liquid crystal display device for improving uniformity of the light and dispensing with optical sheets. The back light unit includes a light source having a holographic pattern formed on a surface thereof opposite the display device which is to display a picture, and a reflective plate under the light source.
Claims6
A back light unit for a liquid crystal display device comprising:
- a flat lamp light;
- and
- a holographic pattern is positioned between the flat lamp light and a liquid crystal panel, wherein the holographic pattern controls a direction and distribution of the light incident thereon and wherein the holographic pattern is formed by casting a transparent material in a mold having a holographic image recorded thereon.
A method of forming a liquid crystal display device, the method comprising:
- providing a flat lamp light;
- and
- providing a holographic pattern between the flat lamp light and a liquid crystal panel, wherein the holographic pattern controls a direction and distribution of the light incident thereon and wherein the holographic pattern is formed by casting a transparent material in a mold having a holographic image recorded thereon.
Dependencies are inferred from the claim text.