Wedge plate type light guiding plate for front light

Details Wedge plate type light guiding plate for front light Wedge plate type light guiding plate for front light

2005-03-29

2005-03-29

O'Shea, Sandra (Department: 2875)

Illumination

Revolving

C362S027000, C362S026000, C362S560000, C362S023000, C349S063000, C349S065000

Reexamination Certificate

active

06871976

ABSTRACT:
A light guiding plate guides light from a light source and irradiates the light onto a display portion. The light guiding plate has an incidence plane, which permits light to enter the light guiding plate, an opposite and plane opposite to the incidence plane an exit plane facing the display portion, and a reflection-exit plane opposite to the exit plane. A plurality of grooves are formed on the reflection exit plane. In any adjacent pair of the grooves, the depth of the groove closer to the opposite end plane is equal to or greater than the depth of the groove closer to the incidence plane. The depth of the grooves substantially increase from the incidence plane toward the opposite end plane. This improves the uniformity of brightness distribution.

REFERENCES:
patent: 6663254 (2003-12-01), Ohsumi
patent: 7-270709 (1995-10-01), None
patent: 8-278760 (1996-10-01), None
patent: 11-242220 (1999-09-01), None
patent: 2000-21224 (2000-01-01), None
patent: 2000-111900 (2000-04-01), None

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