Fresnel lens, transmission screen, and rear projection-type display device using the lens
A Fresnel lens and display device technology, applied to projectors, lenses, and projection devices with built-in screens/external screens, etc., can solve the problems of increased thickness of projection display devices, prevent stray light, and avoid additional components or working hours
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no. 1 approach
[0070] exist figure 1 In , a configuration example of a rear projection display device 10 using the transmissive screen 1 of the present invention is shown. The rear projection display device 10 has: a transmissive screen 1, whose optical system is mainly composed of a Fresnel lens sheet 2 and a light diffusion plate 3; a projector 5, which projects images to the transmissive screen 1; a plane mirror 4, It is arranged at about the middle position between the transmissive screen 1 and the projector 5. The rear projection display device 10 can make the image light projected from the projector 5 pass through the plane reflector 4 (main reflector) to the transmissive screen 1. reflected and projected on a transmissive screen so that an observer on the opposite side observes the image.
[0071] The projector 5 is configured to project an image obliquely with respect to the transmissive screen 1 . If the projector 5 is arranged in this way, the image projected on the transmissive ...
no. 2 approach
[0097] FIG. 5 shows another configuration example of a rear projection display device 20 using the transmissive screen 1 of the present invention. The rear projection display device 10 is composed of the following objects, and is a schematic diagram showing the situation of setting with an inclination angle, namely: a transmissive screen 11, and its optical system is mainly composed of a Fresnel lens sheet 12 and a light diffusion plate 13 Projector 15, which projects an image to the transmissive screen 11; Plane reflector 14, which is disposed approximately in the middle between the transmissive screen 11 and the projector 15, showing a schematic view of the situation where the inclination angle is set on the planar reflector 14 .
[0098] Here, the projector 15' and the light shown by the dotted line in the figure represent the arrangement when directly projecting an image onto the transmissive screen 11 without the plane mirror 14.
[0099] exist figure 1 In the case wher...
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