An imaging optical system includes at least one ghost image prevention element. Ghost images are prevented even when the imaging optical system includes an optical element that has at least one planar surface that is generally orthogonal to an optical axis of the imaging optical system, and is located in a light flux area with at least a central portion of the light flux area being generally parallel to the optical axis. The ghost image prevention element is especially useful in video cameras an...

A liquid crystal projector comprises an illuminating optical system including a light source, a color separating optical system for separating illuminating light rays emitted by the illuminating optical system into light rays of three colors, a projection lens unit comprising a projection lens, a cross dichroic prism disposed near a light receiving end of the projection lens, and a plurality of liquid crystal panels arranged around the cross dichroic prism, and a light source power supply for su...

A rear-type projection display device is provided, in which even a liquid crystal panel having several point defects is used, the point defects are hardly recognized. According to the present invention, in order not to display the display defects (the bright spots or unlit defects) that take place when a light from a light source transmits a liquid crystal panel having the point defects, means for correcting the display defects is provided on the liquid crystal panel side of a screen.

A display apparatus of the type which forms a color image by modulating a plurality of lights different from each other in color by one or more display elements, includes a device for changing the color purity of at least one light by inserting or extracting a wavelength selection element into or out of the optical path of at least one of the plurality of lights, or changing the attitude of the wavelength selection element, and a device for supplying information as to whether the wavelength sele...

A method and systems for projecting an image onto a screen in high ambient light. The image is composed as pixels comprising selected intensities of preselected bands of visible light. The pixels are created by modulating three frequencies of light corresponding to hues in the red, green, and blue spectrum. The modulated light selectively generates pixels of a frame of the image. A diffusive projection screen has a triple bandpass light filter surface that selectively transmits preselected bands...

A digital projector for providing digital images for display to a user, the digital projector comprises a housing having its vertical dimension substantially greater than its horizontal dimension; a light source enclosed within the housing for providing light; a digital imager through which the light of the light source is projected for providing digital images for display to the user; a single mirror for reflecting the digital image from the digital imager; and a lens for receiving the digital ...

For providing a rear-projection type display apparatus, and a translucent type sheet for use therein, in particular, using an image modulation element, such as, a liquid crystal or a DMD (Digital Micro-mirror Device), etc., dissolving the speckle disturbances, thereby obtaining a picture being high in brightness and superior in resolution (focus property) thereof, wherein the translucent type screen comprises, a Fresnel sheet (6), at least on a light exit surface of which is formed a Fresnel len...

An apparatus for compensating a projected image employs a projected image compensator, such as a suitably programmed graphics processor or other processing device, and receives projection display compensation parameters to perform electronic projected image correction based on the received projection on display compensation parameters. The projected image compensator obtains stored final image data, such as data finally rendered by a 2D or 3D graphics engine, that has been stored in a frame buff...

A digital image projector includes an illumination-light source lamp and illumination beam forming optics for forming a white-spectrum illumination beam and color-band-separation optics to divide the illumination beam into color-component subbeams. The digital image projector also includes a reflective digital-image-encoding polarization modulator mechanism such as a reflective liquid crystal display polarization modulator to reflectively modulate the linearly polarized subbeams to form color-co...

A projector including an illumination system that illuminates a modulation device modulating light according to image information. The illumination system includes a light source that emits a light beam along a light source optical axis, a first lens array having a plurality of small lenses which divide the light beam emitted from the light source into a plurality of partial light beams, a superimposing lens that superimposes the plurality of partial light beams emitted from the first lens array...