Projection display
A display device and projection technology, applied in the direction of using projection device image reproducer, projection device, optics, etc., can solve the problems of inability to obtain contrast, uneven illumination, etc.
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Embodiment approach 1
[0049] figure 1 It is a configuration diagram of the illumination optical system 1 of the projection display device according to Embodiment 1 of the present invention. Such as figure 1 As shown, the illumination optical system 1 is composed of an integrating lens 4 , a polarization conversion element 5 , a condenser lens 6 , a field lens 7 and a polarizer 8 located between the light source system 3 and the light valve 2 . In addition, the projection display device according to Embodiment 1 of the present invention has a projection lens (not shown) for projecting the light emitted from the light valve 2 onto a screen. In addition, the light valves 2 are arranged on the respective optical paths of RGB, figure 1 The illustrated illumination optical system 1 representatively shows one of the respective optical paths of RGB.
[0050]The light valve 2 uses a liquid crystal light valve in the embodiment of the present invention, but when a lens array is used, it may be a DMD (Digi...
Embodiment approach 2
[0086] Figure 20 It is a configuration diagram of the illumination optical system 1b of the projection display device according to Embodiment 2 of the present invention. In Embodiment 2 of this invention, it is characterized in that the front-end|tip part of the light-shielding bodies 9T and 9B of the rotation mechanism 9a is formed in the shape of a blade. The configuration and operation of the other parts are the same as those of Embodiment 1, and therefore description thereof will be omitted here.
[0087] Figure 21 It is a diagram showing the rotational position of the rotational mechanism when an image is formed on the light valve according to Embodiment 2 of the present invention. Portions corresponding to Embodiment 1 are given the same reference numerals. Figure 22 The configuration positions of the light-shielding bodies 9T and 9B in Figure 15 same. In addition, 210, 211, 220, and 221 all represent axes passing through the center of curvature of the second le...
Embodiment approach 3
[0093] Figure 26 It is a configuration diagram of an illumination optical system 1 c of a projection display device according to Embodiment 3 of the present invention. Embodiment 3 of the present invention is characterized in that the front ends of the light-shielding bodies 9T and 9B are shaped to have a small opening area, so that the contrast can be sufficiently improved without causing uneven illumination on the light valve 2 . The configuration and operation of the other parts are the same as those of Embodiment 1, and therefore description thereof will be omitted here.
[0094] The light 270 emitted from the second lens array 4b enters the light valve 2 at a relatively large incident angle. At this time, according to the characteristics of the light valve, as the angle of light incident on the light valve 2 increases, the contrast decreases (see Figure 29 ), so it is preferable that the shapes of the light shielding bodies 9T and 9B can shield the light with a relati...
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