Front light having a plurality of prism-shaped lenses

Details Front light having a plurality of prism-shaped lenses Front light having a plurality of prism-shaped lenses

2006-02-21

2006-02-21

Sember, Thomas M. (Department: 2875)

Illumination

Edge lighted panel

Light guide

C362S626000, C362S603000, C385S043000, C349S063000

Reexamination Certificate

active

07001060

ABSTRACT:
A front light includes: a light source, a light guide plate, and a plurality of prism-shaped lenses, each being in contact with a lower surface of the light guide plate. A cross-section of each of the prism-shaped lenses, in a plane perpendicular to the side surfaces thereof, has a shape of equally-sided trapezoid. An obtuse angle Φoutof the equally-sided trapezoidal cross-section and a critical angle θc for the total reflection of the prism-shaped lenses satisfy the relationship of 90°<Φ out≦90°+θc. When the light emitted from the light source enters the prism-shaped lens, the light is allowed to be reflected at a side surface defined by side-edges of the trapezoidal cross-section and thereafter exit through a lower surface. Thus, the light can illuminate pixel electrodes in a liquid crystal panel from a direction normal thereto.

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