US 2012/0069268 A1 · LIQUID CRYSTAL DISPLAY AND BACKLIGHT MODULE FOR THE SAME

Abstract

The present invention discloses a backlight module and a liquid crystal display (LCD) using the same, which can achieve local dimming. The backlight module includes a light guide plate (LGP), which has a groove formed on a bottom. A cross-section of the groove can be arc-shaped. The backlight module further has a plurality of light sources disposed under the LGP at positions corresponding to the groove. The light sources can be two LED light bars. Light emitted from the light bars enters into the LGP and radiates from the LGP. The present invention does not require so many light sources, and thereby power consumption is reduced. The light sources are disposed under the LGP, so that heat can be dissipated through a back plate of the LCD.

Claims20

Dependent claims

A liquid crystal display comprising a liquid crystal panel, a back plate and a backlight module for illuminating the liquid crystal panel, said backlight module being disposed on the back plate, characterized in that:

said backlight module comprising:
a light guide plate having a groove formed on a bottom thereof, said groove having an arc-shaped cross-section;
at least one light bar disposed on the back plate at a position under the light guide plate and corresponding to said groove, light emitted from said light bars entering into said light guide plate and radiating from said light guide plate;
a first spacer disposed between said light sources;
and
a second spacer disposed in said light guide plate corresponding to said groove to separate said light guide plate into different regions,
wherein said first spacer and said second spacer are implemented by double-sided reflective films.

4 more elements

Dependencies are inferred from the claim text.

Liquid crystal display and backlight module for the same

Life of this patent

Liquid crystal display and backlight module for the same

Life of this patent

Abstract

Claims20