Backlight module capable of interchanging polarized states...

Details Backlight module capable of interchanging polarized states... Backlight module capable of interchanging polarized states...

2007-08-07

2007-08-07

O'Shea, Sandra (Department: 2875)

Illumination

Edge lighted panel

C349S062000, C385S146000, C362S558000

Reexamination Certificate

active

11137381

ABSTRACT:
The provided backlight module includes a reflection sheet, a retardation plate, a light-guide plate, a light source, and a sub-wavelength grating plate. The retardation plate is set over the reflection sheet. The light-guide plate is disposed over the retardation plate, and the surface of the light-guide plate comprises a plurality of micro-structures. The light source is set beside the light-guide plate, and the light from the light source transferring into the light-guide plate passes through one of its end and out through the micro-structures. The sub-wavelength grating plate is disposed over the light-guide plate: (i) to transmit light having a polarization oriented parallel to the rows of bars and to define a transmitted light, corresponding to the light, as P-ray, and (ii) to reflect light having a polarization oriented perpendicular to the rows of bars and to define a reflected light, corresponding to the light, as S-ray.

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