Patent ID: 6147725
Filing Date: 2000-11-14
Classification: G02B

Abstract:
A liquid crystal panel module comprising:a backlight unit includinga light guide plate having a first index of refraction, a front surface, a back surface including a plurality of grooves and located opposite the front surface, and a side surface transverse to the front and rear surfaces,a reflecting sheet at the back surface of said light guide plate,a lamp for illuminating the side surface of said light guide plate, anda reflector condensing light radiated from said lamp onto the side surface of said light guide plate;a liquid crystal panel unit arranged opposite the front surface of said light guide plate of said backlight unit and including a polarizing plate having a polarization axis and located on a rear surface of said liquid crystal panel unit opposite the front surface of said light guide plate; anda plurality of equilateral prisms arranged within and filling the grooves in said light guide plate, exposed at the back surface of said light guide plate, and arranged in a direction parallel to the polarization axis of said polarizing plate, each of said plurality of equilateral prisms having a prism angle so that light guided into said light guide plate impinges on a surface of an equilateral prism at the Brewster angle of said equilateral prism, said equilateral prisms having a second index of refraction larger than the first index of refraction of said light guide plate.