US 2009/0153774 A1 · BACK LIGHT MODULE AND LIQUID CRYSTAL DISPLAY

Abstract

A liquid crystal display (LCD) including an LCD panel and a back light module is provided. The back light module is disposed below the LCD panel. The back light module includes a planar light source, a reflective polarized light enhancement film, a first prism film and a λ/4 phase retardation film. The planar light source is disposed below the LCD panel, while the reflective polarized light enhancement film is disposed between the LCD panel and the planar light source. The first prism film is disposed between the reflective polarized light enhancement film and the planar light source. Besides, the λ/4 phase retardation film is disposed between the reflective polarized light enhancement film and the first prism film. The back light module has a relatively high light utilization rate, and the LCD has favorable display luminance.

Claims22

Dependent claims

A back light module adapted to provide a light source required by a liquid crystal display panel, the back light module comprising:

a planar light source disposed below the liquid crystal display panel;
a reflective polarized light enhancement film disposed between the planar light source and the liquid crystal display panel;
a first prism film disposed between the reflective polarized light enhancement film and the planar light source;
and
a λ/4 phase retardation film disposed between the reflective polarized light enhancement film and the first prism film.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/337,575Filed 17 Dec 2008

Priority

TW 9622154818 Dec 2007

Published

18 Jun 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G02B 6/0056
Means for improving the coupling-out of light from the light guide: for producing polarisation effects, e.g. by a surface with polarizing…
G02B 6/0051
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: diffusing sheet or layer
G02B 6/0053
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: prismatic sheet or layer; Brightness…
G02B 6/0055
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: reflecting element, sheet or layer

Back light module and liquid crystal display

Life of this patent

Back light module and liquid crystal display

Life of this patent

Abstract

Claims22