Abstract: A projection display apparatus has a beam controller provided on the optical axis of an optically-modulated linearly-polarized beam, to allow the beam to travel therethrough to reach a screen or cut off the beam, under control by a control signal. The controller, has driving zones on which the beam is incident. The zones are provided in a direction corresponding to a vertical scanning direction of pixels of a liquid crystal display device installed in the display apparatus, for optically modulating a linearly polarized beam. The controller is driven per driving zone in a specific zone order at a timing of vertical scanning of the pixels under control by the control signal generated based on a vertical synchronization signal detected from the input signal. The optically modulated beam is allowed to travel through the controller or cut off when incident on the zones at the timing of the vertical scanning.

Abstract: A projection display apparatus has a beam controller provided on the optical axis of an optically-modulated linearly-polarized beam, to allow the beam to travel therethrough to reach a screen or cut off the beam, under control by a control signal. The controller, has driving zones on which the beam is incident. The zones are provided in a direction corresponding to a vertical scanning direction of pixels of a liquid crystal display device installed in the display apparatus, for optically modulating a linearly polarized beam. The controller is driven per driving zone in a specific zone order at a timing of vertical scanning of the pixels under control by the control signal generated based on a vertical synchronization signal detected from the input signal. The optically modulated beam is allowed to travel through the controller or cut off when incident on the zones at the timing of the vertical scanning.

Abstract: A polyphase image signal generating device has a latch selection to latch original polyphase image signals of a first to an N-th phase original image signal (N being a natural number of two or more), and a selector connected to the latch section. The selector selects the original polyphase image signals in a first order from the first to the N-th phase original image signal or a second order from the N-th phase to the first original image signal, to output the selected polyphase image signals. The latch section may include N latches of a first to an N-th latch where an L-th original image signal and a {N−(L−1)}-th original image signal are latched by both an L-th and a {N−(L−1)}-th latch, L being a natural number of N or less.

Abstract: A liquid-crystal display apparatus includes a layer of liquid crystal. A matrix array is composed of scanning electrodes and signal electrodes. The scanning electrodes extend along a matrix row direction. The signal electrodes extend along a matrix column direction. Switching circuit elements are located at respective places where the scanning electrodes intersect with the signal electrodes. Pixel electrodes connected to the switching circuit elements are operative for controlling portions of the liquid-crystal layer respectively. A first device is operative for driving the scanning electrodes. A second device is operative for delaying a first video signal into a second video signal. A third device is operative for alternately selecting one out of the first video signal and the second video signal to generate a third video signal in response to the first video signal and the second video signal.

Abstract: An image processing system for an image display comprising an image data producing device for producing image data corresponding to an image to be displayed and a display device for displaying the image on the basis of the produced image data. The image data producing device divides the image data into a plurality of data sections respectively corresponding to image areas constituting the image so that each of the plurality of data sections is produced as serial data and the plurality of data sections are outputted in parallel. The display device includes a number of pixel elements continuously arranged one-dimensionally or two-dimensionally and equally divided into a plurality of element sections respectively corresponding to the plurality of data sections.

Abstract: A display unit includes a light-emitting element array having a plurality of linearly arranged light-emitting elements drivable by a time sequential image information signal to emit beams of light in accordance with pieces of information allotted to the corresponding picture elements, a deflector such as a polygon mirror for deflecting the light beams simultaneously in a direction perpendicular to the longitudinal direction of the light-emitting element array, and a light-to-light conversion element including a photoconductive layer and a photo-modulation layer, the light beams being imaged on the photoconductive layer.

Abstract: In a color image display apparatus, light beams intensity modulated by a green color image signal are deflected by an ocillating mirror, and then focused on a photo-conductive layer (PCL) member of a light-written type spacial light modulation element (SLM) through two focusing lenses for light write operation. Light beams intensity modulated by a time-axis compressed time-divisional image signal of two remaining colors (red and blue) are deflected by another mirror oscillated simultaneously with the ocillating mirror, and then focused on a PCL member of a SLM of the same type through two focusing lenses for light write operation. A read light beam is resolved into the light of the green wave length band and the lights of red and blue wave length bands, respectively, and then given to the SLMs, respectively for light read operation. The two read light beams reflected by the SLMs are synthesizing, and then projected on a screen through a common projection lens.

Abstract: A display unit includes a light-emitting element array having a plurality of linearly arranged light-emitting elements drivable by a time sequential image information signal to emit beams of light in accordance with pieces of information allotted to the corresponding picture elements, a deflector such as a polygon mirror for deflecting the light beams simultaneously in a direction perpendicular to the longitudinal direction of the light-emitting element array, and a light-to-light conversion element including a photoconductive layer and a photo-modulation layer, the light beams being imaged on the photoconductive layer.

Abstract: The present invention offers a display system for displaying information comprising a linear array of N light-emitting devices emitting light of predetermined wavelength, the devices are arranged respectively with N pixels, a stream of the information is divided into pieces each of which containing the N pixels, and the N light-emitting devices are caused to emit N light beams simultaneously in a form of array during a given period for every divided piece of the information, the every divided piece of information may correspond to one line of a frame of picture, the N light beams are intensity-modulated respectively with the divided piece of the information, the N light beams are deflected simultaneously in a direction perpendicular to a direction of the array of the N light beams, and a spatial light modulator having a photoconductive layer and a light modulation layer interposed between a pair of electrodes, the photoconductive layer is responsive to the deflected N light beams incident thereto through a fo

Abstract: An optical system is disclosed which is for a display apparatus having a light source for emitting read light and a reflection type spatial light modulator for modulating the read light incoming thereto into in accordance with image written thereon. The modulated light is projected onto a screen by a projection lens to display the image. A field lens is provided between the modulator and screen at such a position that both the read and modulated light pass therethrough. The field lens focuses the modulated light on near an entrance pupil of the projection lens so that the intensity of the modulated light is increased.

Abstract: A clear color image having a high contrast ratio without particular coloration is displayed on a screen by improved display apparatus. Such display apparatus is comprised of a spatial light modulator including a photo-conductive layer, a photo-modulator layer and a dielectric mirror, a device for writing color images of different colors onto the spatial light modulator time-divisionally in a sequence of the different colors, a reading device for producing reading lights having different colors in synchronism with time-divisional writing of the color images, and for projecting the reading lights to the spatial light modulator, a driving device for supplying the spatial light modulator with different voltages and frequencies correspondingly with the reading light of different colors and in synchronism with time-divisional projections of the reading lights, and a device for projecting the color images read out from the spatial light modulator on the display device.

Abstract: An overhead projector for irradiating a spatial light modulator with reading light to read out a subject image written in the spatial light modulator with writing light and projecting the subject image read out with the reading light, wherein the spatial light modulator consists of photoconductive layer for receiving the writing light coming from a subject to reproduce the subject image, light modulating layer formed by a liquid crystal of which molecules are arranged in a homeotropic orientation for modulating the reading light of which a waveband is limited to a prescribed range according to the subject image reproduced in the photoconductive layer, and a dielectric mirror having wavelength selectivity for reflecting the reading light with the waveband modulated by the light modulating layer.

Abstract: A display unit which can be used with various sources of information includes a light-to-light conversion element composed of first and second stripe electrodes arranged to jointly form a matrix electrode, and a photoconductive layer and a light modulation layer disposed between the first and second stripe electrodes, the impedance of the photoconductive layer changes with information written to the light-to-light conversion element. The photoconductive layer is irradiated with a linear light beam deflected in a direction to intersect first stripe electrode, while at the same time successive pieces of information to be inputted to corresponding picture elements are supplied to respective stripe electrode elements of the first stripe electrode. With the use of the matrix electrode, information can be written to and read out from the light-to-light conversion element at a higher response rate with high resolution.

Abstract: A light-light transfer method using a spatial light modulator realizes an image display with a high utilizing of light without causing an undesirable residual image. The spatial light modulator is constituted to include two electrodes and at least a photoconductor layer member and a photo-modulation layer member used in a birefringence operating mode both being sandwiched between the two electrodes. A writing light is entered from the photoconductive layer member side so that its exposure value varies from the minimum exposure value to the maximum exposure value in a condition that a predetermined operation voltage is supplied between the two electrodes. In this instant, a voltage applied between both ends of the photo-modulation layer member corresponds to a voltage obtained by subtracting a voltage drop amount, occurring in the photoconductor layer member due to an incidence of the writing light, from said predetermined operation voltage applied in advance between said two electrodes.

Abstract: A display device of projection type capable of projecting an image with well defined image frame is disclosed. The device comprises 3 spatial light modulators on which color image information is written in 3 primary colors respectively and is read out as a combined optical color image in a form of light beam, the light beam is then projected out of the display device through lens groups for forming a projected image on a screen, the device further comprises a mask disposed in a proximity of an imaginary image formation plane arranged to locate in a vicinity of one of the lens groups, the light beam is caused to form an optical image on the imaginary image formation plane. The mask has a variable light shielding configuration controlled either electronically or electro-mechanically for cutting off unnecessary light portions of the light beam carrying the optical image so that an image of high contrast and well defined clear fringe is projected on the screen.

Abstract: There is provided an optical system for a spatial light modulator. The system comprises a light source for emitting an unpolarized light, a separator for separating a first linearly polarized light having a specified plane of polarization from the unpolarized light and polarizer for rotating the plane of polarization of the first linearly polarized light at a specified angle different from the specified angle to obtain a second linearly polarized light, wherein the second linearly polarized light is adopted as a reading light. Also provided is a method of photomodulation, comprising the steps of separating a light in the region of a specified wavelength from an unpolarized light, separating a first linearly polarized light having a specified plane of polarization from the light and obtaining a second linearly polarized light by rotating the plane of polarization of the first linearly polarized light at a specified angle.

Abstract: A drive apparatus for an optical element array includes a counter counting clock pulses and being periodically reset at a horizontal scanning period. The counter outputs first and second counter signals out of phase with each other. A latch holds a pixel-corresponding segment of an input image signal. One of clock signals out of phase with each other is selected in response to the pixel-corresponding input-signal segment held by the latch. A first comparator compares the first counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a first identity signal when the first counter signal and the pixel-corresponding input-signal segment are equal to each other. A second comparator compares the second counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a second identity signal when the second counter signal and the pixel-corresponding input-signal segment are equal to each other.

Abstract: There is provided an apparatus for displaying an image on a screen by projecting a reading light from a light source onto a spatial light modulator of reflective type in which the image is written, and projecting a reflected light from the modulator corresponding to the image onto the screen through a projection lens, the modulator, lens and screen being provided so that their optical axes are in agreement on one optical path. The apparatus comprises an optical device provided between the lens and screen for the reading light toward the modulator and passing the reflected light to the screen and a converging element for converging the reading light on the position which is on the optical axis of the lens and located between the lens and screen so that the reading light thus turned becomes a parallel pencil beam which is projected onto the modulator in parallel with the optical axis.

Abstract: A spatial light modulator which includes a light modulation layer which is interposed between two photoconductive layers and laminated to both layers; the two photo conductive layers have charge images written thereon, respectively, by illumination of a writing light carrying optical information; the illumination direction of the writing light to the photoconductive layers are different from each other; and the two photoconductive layers permit the reading light to pass therethrough. When illuminated by a reading light via either of the first or second photoconductive layers, the light modulation layer optically modulates the reading light in accordance with the first and second charge images, under the presence of a voltage applied to the modulator. Thus it reads read out the first information and second information. The first and second photoconductive layers permit the reading light to pass therethrough.

Abstract: A color imaging system for use as an electronic still camera, for example, includes a color separator for separating the optical image of a subject from a lens into a plurality of different color images, an optical shutter selectively openable for transmitting the optical image of the subject to the color separator, a photoconductive layer for converting the different color images into respective electric charge images, and an information recording medium for recording images corresponding to the electric charge images under an electric field developed between the photoconductive layer and the information recording medium. The timing with which the optical shutter is opened and the timing with which the electric field is generated by the power supply, are controlled by a control unit depending on imaging conditions selected by the user. The color imaging system also has an optical viewfinder for allowing the user to visually observe the optical image of the subject introduced by the lens.