Patent ID: 7012744
Filing Date: 2006-03-14
Classification: G02B,G03B

Abstract:
1. A transmissive screen applied to a rear projector, the transmissive screen comprising: a light-guide plate having substantially cylindrical light-guide spaces arranged in a flat substrate; a light-exit-angle distribution uniformizing device to make the angular distribution of the light exiting correspondingly from the substantially cylindrical light-guide spaces of the light-guide plate uniform over the transmissive screen, the light-exit-angle distribution uniformizing device being disposed at the light-exiting face side of the light-guide plate, and wherein the light-exit-angle distribution uniformizing device includes a microlens array having microlenses, each microlens being provided correspondingly to each of the substantially cylindrical light-guide spaces of the light-guide plate, and wherein a material composing the microlenses in a substantially central region of the transmissive screen has a greater refractive index than at least a second material composing the microlenses in a peripheral region of the transmissive screen.