Prism sheet and backlight unit employed in a liquid crystal display

• US 20070047111A1
• Filed: 12/19/2005
• Published: 03/01/2007
• Est. Priority Date: 08/26/2005
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Seoung, Lee, Weon
• Application Number:
  US11/303,975
• Publication Number:
  US 20070047111A1
• Time in Patent Office: Days
• US Class Current: 359/831
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02B 5/3041 comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Abstract

The present invention relates to a prism sheet for performing the function of polarization. The prism sheet comprises a prism and a polarization film. The polarization film is formed by depositing a first layer and a second layer on the prism, wherein the first layer and the second layer have different refractive index. The prism sheet includes a multilayered polarization film, and so transmits some of a light incident thereto by the polarization film.

Claims

1-2. -2. (canceled)

3. A backlight unit employed in a liquid crystal display comprising:

a diffusion sheet disposed adjacent to the lamp; and

a prism sheet having a prism for collimating light from the diffusion sheet, and disposed on the diffusion sheet,

wherein the prism sheet includes a film including at least one first layer and at least one second layer having different refractive indices on the prisms.

4. The backlight unit of claim 3, wherein the first layer is made up of a substance having a high refractive index, and the second layer is made up of a substance having a low refractive index.

5. The backlight unit of claim 3, wherein the film reflects a part of a light incident from the diffusion sheet in the direction of the light guiding plate.

8. The backlight unit of claim 3, wherein the first layer and the second layer are repeated laminated in turn.

6. A prism sheet employed in a backlight unit comprising:

a prism for collimating an incident light; and

a film including at least one first layers and at least one second layers on the prism, wherein the first layer and the second layer have different refractive indices.

7. The prism sheet of claim 6, wherein the first layer is made up of a substance having a high refractive index, and the second layer is made up of a substance having a low refractive index.

9. The backlight unit of claim 6, wherein the first layer and the second layer are repeated laminated in turn.