Optical integrator
a technology of optical integrator and integrated display element, which is applied in the field of optical integrator, can solve the problems difficult alignment, and achieve the effects of poor light utilization efficiency, high price, and simple assembly of the single plate utilized by the display elemen
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first embodiment
[0023]FIG. 1 is a structural view showing the optical unit of the invention.
[0024] In this figure, the light emitted from the light source 1 obtained after reflection from a reflector is input to a first array lens 2 for forming a plurality of secondary light source images, and then passed through a second array lens 3 formed by a plurality of focusing lenses and installed in the vicinity of the second light source image, for forming lens images for each of the first array lenses 2 in the liquid crystal display element 12. The mixed light of P polarized light and S polarized light that passed through the second array lens 3, the S polarized light for example is aligned by the polarized beam splitter 4 (hereafter referred to simply as PBS) and the λ / 2 wavelength plate 4a, and passed through the first collimator lens 5a and second collimator lens 5b and the light respectively reflected as red light, green light and blue light by the red dichroic mirror 7a for reflecting red light, the...
second embodiment
[0034] the present invention is next described while referring to FIG. 3 through FIG. 5.
[0035]FIG. 3, FIG. 4 and FIG. 5 are structural views showing the second embodiment of the optical unit of the invention and flat views of the display element. FIG. 3A, FIG. 4A and FIG. 5A are structural views of the respective optical units. FIG. 3B, FIG. 4B and FIG. 5B are show locations on the display element irradiated by the red light, green light and blue light. In the figure, when the reflecting rotating multisurface element 43 is rotating in the direction of arrow A. FIG. 3A shows the embodiment when the red light, green light and blue light reflected by the dichroic mirror groups 7a, 7b, 7c is beamed upon one surface of the reflecting rotating multisurface element 43. In this case, as shown in FIG. 3B, the locations irradiated by the red light, green light and blue light, are 12R, 12G and 12B in sequence from left to right on the display element 12. The embodiment in FIG. 4A shows the cas...
third embodiment
[0047]FIG. 7 is structural views showing the optical unit of the present invention. Sections in the figure assigned with the same reference numerals are identical to the same sections in the embodiments of FIG. 1 and FIG. 3 through FIG. 5 so an explanation is omitted here.
[0048] The optical path between the light source 1 to the dichroic mirror group 7a, 7b, 7c is different from the optical path shown in FIG. 1 in that there is no second collimator 5b however the other components of the optical path are the same.
[0049] In the optical path from the dichroic mirror group 7a, 7b, and 7c to the reflecting rotating multisurface element 43 is different from the optical path shown in FIG. 1 in that there is no third collimator 5c, however this collimator 5c may also be used. Two types of converging lenses 6a, 6b are used in the optical path from the reflecting rotating multisurface element 43 to the PBS10. The structure from the PBS10 onwards is the same as shown in FIG. 1. The dotted lin...
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Abstract
Description
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