Transmissive screen and rear projector
First Claim
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, andwherein 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.
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Accused Products
Abstract
The invention provides a transmissive screen having low occurrence of light diffraction and moire-fringing. The invention also provides a rear projector including such a high-quality transmissive screen. A transmissive screen, applied to a rear projector, includes a light-guide plate having substantially cylindrical light-guide spaces arranged in a flat substrate, and a light-exit-angle distribution uniformizing device to make the angular distribution of the light exiting from the substantially cylindrical light-guide spaces of the light-guide plate uniform over the transmissive screen. The light-exit-angle distribution uniformizing device is provided at the light-exiting face side of the light-guide plate. The invention also provides a rear projector including such a transmissive screen.
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Citations
13 Claims
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1. A transmissive screen applied to a rear projector, the transmissive screen comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification