Abstract: A full color video projector system using a light source and a single light valve. The output of the light source passes through a condenser lens. The lens is directed toward a splayed array of red, green, and blue dichroic reflector color filters. The reflected three primary color beams first pass through a lenticular lens array, comprised of a plurality of elongated cylinder lenses, arranged in parallel, co-planar relation. The lenticular array produces color stripe illumination pattern, which is redirected and focused by a relay optic upon a reflective micro-mirror light valve. The light valve includes three sub-pixels for every full-color screen pixel. The pixels are arranged in parallel stripes which correspond to the size and configuration of the color strip illumination pattern outputted by the lenticular array. Light valve address circuitry actuates appropriate sub-pixels to reflect incident light energy, in accordance with corresponding video image information.

Abstract: RD 29133-17-A method for facilitating a reduction of speckle in a screen receiving light from a light source includes positioning at least one optical path distributing screen element such that the light originating from the light source passes through the screen element and emerges decorrelated from the screen element toward an audience space. The method further includes positioning an angular distribution element between the screen element and the audience space such that the angular distribution element distributes the decorrelated light from the screen element toward the audience space.

Abstract: The present invention provides an apparatus and method for enhancing image resolution by a position perfurbation modulation which changes optical imaging paths by a rotatable wedge lens turntable. The imaging positions on an image detector is periodically changed so as to obtain the effect of the displacement disturbance and to breach the resolution limitation of the image detector. The present invention could further cooperate with the design of an optical imaging system and image processing to increase the image resolution and detect where a questionable pixel situates.

Abstract: An East-West switching transistor is coupled between a flyback transformer primary winding and a horizontal deflection output transistor circuit to control retrace energy to obtain an East-West modulation of the deflection current amplitude as required for East-West pincushion raster correction. A pair of series coupled first and second capacitors forming a capacitive voltage divider are coupled to a retrace resonant circuit that includes the deflection winding via a sampling switch, during a first half of a retrace interval, to produce a first ramping capacitor voltage in the first capacitor from a portion of a retrace pulse voltage. The first capacitor is coupled to an East-West pincushion raster correction current for producing a second ramping capacitor voltage in the first capacitor that ramps in an opposite direction. A comparator is responsive to the capacitor voltage for controlling a conduction interval of the East-West switching transistor.

Abstract: An illumination system for a color projection display. In one embodiment a broad spectrum light source illuminates a multilevel optical phase element which disperses the broad spectrum light from the light source by diffraction. A display having a number of pixel elements, each capable of transmitting a predetermined spectral region, is positioned within the near field region of the multilevel optical phase element so as to receive the light dispersed by the multilevel phase element.

Abstract: Disclosed is a color separating/synthesizing apparatus which uses three polarized beam splitters and one dichroic filter, as compared to a conventional system using four polarized beam splitters, thereby achieving a lightness in weight and a reduction in costs while achieving an improvement in performance.

Abstract: An “extra-folded” projection display system includes a selectively reflective material (e.g., a linear reflecting polarizer) placed immediately behind the system's imaging screen. The display system includes an image projector that projects an image beam containing light of a predetermined linear polarization toward the imaging screen. The linear reflecting polarizer reflects the light in the image beam away from the screen. The reflected image beam then encounters a ¼-wavelength achromatic retarder which converts the linear polarization to circular polarization. The image beam next hits a mirror that reflects the light back through the ¼-wavelength achromatic retarder, which converts the circular polarization back to linear polarization, with the polarization director rotated 90° from the original polarization director. The linear reflecting polarizer then allows the light to pass through to the image screen.

Abstract: A reflecting portion is formed on a periphery of an opening portion 20 of an aperture element for a video projector. The reflecting portion 21 reflects a portion of illumination light illuminating a reflecting type display element, which is other than necessary portion for expanding and projecting an image information by a projecting lens, to an area outside an incident area of the projecting lens such that the light portion is not incident on the projecting lens.

Abstract: Two of four light sources have canceling characteristics with respect to color nonuniformity, and the other two light sources have canceling characteristics with respect to color nonuniformity. A light emission stop detector detects that each of the light sources stops emitting light by blowing its bulb, for example, and feeds, if a certain light source stops emitting light, information indicating that the light source stops emitting light to an energization controller. The energization controller stops, when it receives the information indicating that a certain light source stops emitting light, the energization to a light source paired with the certain light source and puts out the light source.

Abstract: An “extra-folded” projection display system includes a selectively reflective material (e.g., a linear reflecting polarizer) placed immediately behind the system's imaging screen. The display system includes an image projector that projects an image beam containing light of a predetermined linear polarization toward the imaging screen. The linear reflecting polarizer reflects the light in the image beam away from the screen. The reflected image beam then encounters a ¼-wavelength achromatic retarder which converts the linear polarization to circular polarization. The image beam next hits a mirror that reflects the light back through the ¼-wavelength achromatic retarder, which converts the circular polarization back to linear polarization, with the polarization director rotated 90° from the original polarization director. The linear reflecting polarizer then allows the light to pass through to the image screen.

Abstract: A television receiver (10) that has a spatial light modulator (15) and a projection lens (17a) and that projects images to a screen (18). If the aspect ratio of the image to be displayed does not match that of the spatial light modulator (15), an anamorphic lens (17b) is positioned in the optical path of the image, between the projection lens (17b) and the screen (18). In this case and in typical applications, the spatial light modulator (15) generates an image that is anamorphically squeezed in the horizontal dimension, and the anamorphic lens (17b) widens the image so that the viewer perceives a normal wide-screen image on the screen (18).

Abstract: Projection lens systems (13) for use in CRT projection televisions (10) are provided. From the screen side, the systems have three lens units (U1, U2, U3), the first two units (U1, U2) forming a retrofocus lens and the third unit (U3) being associated with the CRT during use and serving to correct field curvature. At its screen end, the first lens unit (U1) has a negative element (E1) which has a screen surface (S1) which is concave to the screen. The second lens unit (U2) has two positive subunits (US1, US2), the first subunit (US1) being a color correcting doublet composed of glass and the second subunit having a positive lens element (E2) at its screen end. The projection lens systems are fully color corrected, have f/#'s of 1.0 for an infinite conjugate, have half fields of view of at least 25°, and are economical to manufacture.

Abstract: Projection lens systems (13) for use in projection televisions are provided. The systems are characterized by a screen side lens unit (U1) which: (1) has a weak optical power; (2) has a negative, aspherical lens element composed of a high dispersion material; and (3) has a positive lens element which is composed of a low dispersion material.

Abstract: Methods and apparatus for using more effectively the front side area of a rear projection display as a screen positioning area disclosed. Almost all of the p-polarized light beams emitted from an image projector are reflected by a polarizing selection element, and almost all of the reflected light beams are converted into s-polarized light beams by a polarizing conversion mirror as the light beams are reflected towards a screen. Of the s-polarized light beams produced as the light beams are reflected by the polarizing conversion mirror, those that are not incident upon the polarizing selection element strike the screen in order to form an image. On the other hand, those that are incident upon the polarizing selection element pass through the polarizing selection element and strike the screen in order to form an image thereon.

Abstract: A projection television receiver for embodying a high definition and high quality projection television receiver by processing an image of an image source. A red, a green and a blue image are formed and emitted into a red, a green and a blue colors at a cathode ray tube. The emitted red, green and blue images are received and gathered for reiterating the red, the green and the blue images at a mirror unit. The reiterated red, green and blue images unit are displayed onto a screen by enlarging and projecting the images through a lens assembly.

Abstract: An image display system (10) having an auto-focus system (24). An image sensor (20) such as a CCD camera, senses the sharpness of pixels (26) comprising a portion of the image at a screen (16), preferably a magnified portion of the image. A sensor data processor (22) processes the pixel data from the sensor (20), and instructs the auto focus system (24) to adjust an optical parameter such as the focal length of a projector lens (14) as a function of the sensor (20) output. A DMD-type SLM is preferably utilized due to the uniform geometric features of the pixel mirrors, but other SLM's can be used. The sharpness or contrast between an “on” and an “off” pixel is sensed, and preferably a 10×10 array of pixels arranged in a checker board pattern is sensed.

Abstract: An “extra-folded” projection display system includes a selectively reflective material (e.g., a linear reflecting polarizer) placed immediately behind the system's imaging screen. The display system includes an image projector that projects an image beam containing light of a predetermined linear polarization toward the imaging screen. The linear reflecting polarizer reflects the light in the image beam away from the screen. The reflected image beam then encounters a ¼-wavelength achromatic retarder which converts the linear polarization to circular polarization. The image beam next hits a mirror that reflects the light back through the ¼-wavelength achromatic retarder, which converts the circular polarization back to linear polarization, with the polarization director rotated 90° from the original polarization director. The linear reflecting polarizer then allows the light to pass through to the image screen.

Abstract: A micromirror light valve target configuration that overcomes the problems of limited deflection range, electrostatic and resolution by forming the secondary electron collector grid of a fine conductive mesh and placing it in close proximity to the micromirror array. The source, preferably a fixed beam array, addresses the micromirror array such that it exhibits a secondary emission coefficient less than one to write a negative charge pattern onto the mirrors so that they are attracted to the collector grid. If the anode is also in close proximity to the array, the mirrors can be addressed so that they deflect up toward the grid and down toward the anode thereby increasing the deflection range.

Abstract: An apparatus and method to dynamically shape the projected energy profile of an electron beam and the energy distribution of an electron beam of a cathode ray tube to provide a single cathode ray tube the ability to display multiple image formats of varying resolutions, brightnesses and aspect ratios. In one embodiment, the invention contemplates the introduction of a shaping lens along the path of the electron beam comprising at least three electrodes. Voltages are selectively applied to the electrodes to dynamically and selectively vary the projected energy profile of an electron beam in a plane perpendicular to the longitudinal axis of the cathode ray tube.

Abstract: When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system, a fourth lens group having an aspherical lens surface, a fifth lens group, and a sixth lens group including a lens having a profile of aspherical surface in which the concave surface thereof faces the screen side and the refractive power in the marginal area is weaker than the refractive power around the optical axis, a projection lens system having a large aperture ratio (low F-number), high focus, wide field angle, and sufficient marginal light amount ratio can be realized at a low cost. When a predetermined opening portion is formed in the projection lens and lens barrel, the lens elements are cooled by air suction and exhaust and the lowering of the lens performance due to temperature change can be prevented.

Abstract: The present invention relates to a rear projection screen used in projection type television sets and the like. A rear projection screen according to the present invention is characterized in that a mask for prevention of penetration of light is formed on the main surface on one of the inner and outer sides of a bottomed box-shaped container and a screen which directs projected light in a predetermined direction is disposed on the inner side of this box-shaped container. The method of producing a rear projection screen according to the invention is capable of efficiently producing the box-shaped container having a mask formed thereon.

Abstract: A reflection type display device wherein the brightness of pixels is controlled by deflecting a reflecting surface corresponding to a pixel in the reflection type display device for a time proportional to a charge transmitted to the pixel. A reflecting surface capable of deflection is charged and a region adjacent the reflecting surface is charged with an initial charge which is proportional to the desired brightness of the pixel and of sufficient magnitude and polarity to deflect the reflecting surface to a reflection angle. The region adjacent the reflecting surface is discharged so as to maintain the magnitude of the charge of the region adjacent the reflecting surface above the magnitude of charge sufficient to deflect the reflecting surface so that the reflecting surface remains deflected for the time corresponding to the desired brightness of the pixel.

Abstract: A projector apparatus which assures easier fine and rough adjustment of a swing and tilt angle, includes inclination rings which are formed symmetrically with respect to the center line of the aperture and is provided with at least two or more continuous inclined surfaces of predetermined inclination angle in both sides of the center line on one surface, a ring supporting member for supporting the inclined surfaces of the inclination rings and a ring guide for assisting rotation of the inclination rings wherein the inclination rings are arranged in such a condition that the other surfaces where the inclined surfaces are not formed are provided opposed with each other.

Abstract: The present invention is to improve color purity and brightness of a color Braun tube by constructing a fluorescent film for a red fluorescent material as a laminated structure. The present invention relates to a structure of a fluorescent film for a color Braun tube wherein the fluorescent film of the red fluorescent material comprises fluorescent material layers having a laminate structure made of two different compositions of Y.sub.2 O.sub.2 S: Eu and Y.sub.2 O.sub.3 :Eu.

Abstract: A projection display apparatus comprises an image source having a rectangular image-displaying surface; a projecting lens assembly for magnifying and projecting the image onto a screen; and light-obstructing plate disposed in the vicinity of the nearest lens element of the projecting lens assembly to the image source. The light-obstructing plate is disposed in such a position that 0.1.ltoreq.R.sub.1 /R.sub.2 .ltoreq.0.8 where R.sub.1 is a radius of optical-axis light which is emitted toward the screen from a central point on the image-displaying surface through which the optical axis of the projecting lens assembly passes, and R.sub.2 is a radius of effective light which is emitted toward the screen from the image-displaying surface.

Abstract: A projection tube featuring good accuracy in controlling a slant angle between a cathode ray tube and a projection lens, an excellent focusing performance, and further low production cost, and also a video projection systems which utilizes the foregoing projection tube. There are a spacing member to control the slant angle and according to the slant angle, both being built between a cathode ray tube and a radiator.

Abstract: An optical system for a rear projection picture display has reduced size while maintaining screen size. Two plane mirrors are provided along a light path between a picture display unit and a screen. The first plane mirror at a projection lens side is made of a reflecting polarizer and is located along a light path between the second plane mirror and the screen. The two plane mirrors are set in a relative angle so that the incident angle of the light traveling from the projection lens to the first plane mirror is large as compared with the incident angle of the light traveling from the second plane mirror to the first plane mirror. A polarizing plate is attached at the rear side of the screen.

Abstract: An optical assembly device (10) for use in front of a television screen having a diagonal dimension of S, which optical assembly comprises four panels (12 to 15) connected together to form a hollow body (11) having a substantially rectangular open front side (16) of width W and the height H and a substantially rectangular open rear side (17) of width W' and height H', the separation between the front and rear sides (16 and 17) being D and the inner sides of the panels being reflective. The optical assembly (10) further comprises front and rear lenses (18 and 19) provided extending across the open front and rear sides (16 and 17), respectively, of the body (11), the front side of the rear lens (19) being reflective, wherein the dimensions are related according to the following formulae:(1) W=[1+(W'/H'-B)].multidot.W'(2) H=[1+(W'/H'-B)].multidot.H'(3) D=K.multidot.SWhere:(i) B=(.sqroot.5-1)/2(ii) 0.1<K<0.2.

Abstract: A projection system employs a reflective light valve (10) that is optically addressed by an image from a cathode ray tube (12) and provides an output image for projection by means of a high intensity reading light from a lamp (16) directed to the output face of the liquid crystal light valve. Improved reading illumination is provided by scanning the face of the liquid crystal light valve (10) with a narrow beam of light (80) that moves across the liquid crystal light valve face in synchronism with a scanning image from the writing CRT (12). The scanned narrow band of illumination is provided by refractive transmission through a rotating transparent polygonal body (50,74) having pairs of mutually parallel sides (54,56,58,60,75,76,77a,b), wherein different pairs of sides may be made to transmit light of different colors for color projection.

Abstract: An image pick-up and projection apparatus comprising a projection unit (14), a pick-up unit (11) and a projection screen (9) switchable between a transmissive state and a diffusing state. By arranging an array (15) of elongated prismatic elements on the front surface of the screen, the contrast of the projected image is enhanced and it is avoided that a user (12) can simultaneously see the front of the projection unit and the front of the pick-up unit.

Abstract: An image projection system for projecting an image obtained on an image field onto a screen through a projection lens comprises a plurality of spacers overlaid with each other and arranged between the image field and the lens, each of the spacers having first and second surfaces through which the image is projected and an angle defined by the first and second surfaces being a predetermined value, an adjusting device for each of the spacers for adjusting a rotational angle of the spacers on a rotational axis substantially parallel to an image projection direction, and a fixing device for fixing the plurality of spacers relative to the image field and the lens.

Abstract: A projection type display device including a CRT with a fluorescent layer and a face glass for projecting an image reflected onto the fluorescent layer through the face glass, a transparent liquid, at least one lens element and onto a screen. The transparent liquid is filled within a space between the face glass of the CRT and the at least one lens element and has a refractive index substantially the same as a refractive index of the face glass of the CRT and the at least one lens element. A light attenuation filter having a transmittance no greater than 0.9 is disposed at a position from the fluorescent layer to the at least one lens element such as between the face glass and the at least one lens element.

Abstract: A video projection system employs a reflective light valve (10) that is optically addressed by an image from a cathode ray tube (12) and provides an output image for projection by means of a high intensity reading light directed to the output face of the liquid crystal light valve. Improved reading illumination is provided by scanning the face of the liquid crystal light valve (10) with a narrow beam of light (80) that moves across the liquid crystal in synchronism with the scanning image from the writing CRT (12). The scanned narrow band (80) of illumination is provided by a circular sequence of three quasi cylindrical lens (56, 58, 60) or mirrors (56a, 58a, 60a) mounted on a rotating wheel (52) and which may be made of sequentially different colors to provide a color display. Rotation of the lens or mirror bearing wheel (52) is synchronized with the vertical sync of the CRT scan, as are the index positions of each of the three lens or mirror segments on the wheel.

Abstract: The disclosure relates to display sets wherein the image produced by a cathode-ray tube is displayed on a display screen by means of an optical device. It relates more particularly to means for facilitating the relative positioning between the cathode-ray tube and the optical device. The cathode-ray tube comprises a bulb having one end closed by a transparent plate bearing an cathodoluminescent screen. In one characteristic, the transparent plate is greater than the bulb and comprises a peripheral part that extends beyond the bulb so as to constitute a reference marker of the position of the cathodoluminescent screen. FIG. 1.

Abstract: In a lens-barrel etc. for holding lenses, a thin film composed of a fluororesin compound having a refractive index lower than that of a material constituting the lens-barrel is formed on an inner surface of the lens-barrel, thereby lowering an amount of the reflective light appeared on the inner surface of the lens-barrel.

Abstract: In a projection television system having display elements displaying images of respective colors, a screen on which a color image is formed by magnifying and synthesizing the images of the respective colors, projection lenses for magnifying the images on the respective display elements and projecting them onto the screen thereby to form the color image, with the optical axis of the projection lens for a first color being disposed at a right angle to the screen and the optical axes of the projection lenses for second and third colors being disposed at an angle with respect to the optical axis of the projection lens for the first color, color imbalance is reduced. This is achieved by disposing the projection lenses for the second and third colors so that their optical axes are incident on a point different from the point at which the optical axis of the projection lens for the first color is incident.

Abstract: A projection lens system for projecting an image from a cathode ray tube (CRT) onto a screen is provided. The spherochromatic aberration of the system is reduced through the use of a first lens element which has (i) a positive power on axis and at least one aspheric surface which causes the positive power to become negative in the vicinity of the lens element's clear aperture, and (ii) a high dispersion. The first lens element is preferably composed of styrene.

Abstract: A projection lens system for projecting an image from a cathode ray tube (CRT) onto a screen is provided which includes in order from the image end: a first lens unit (U1), a second positive lens unit (U2) which may include a color correcting doublet, a corrector lens unit (CR), and a third negative lens unit (U3) which is associated with the CRT during use. The first lens unit preferably has a hybrid construction and includes: a first lens element (L1) composed of glass and having spherical surfaces, a second lens element (L2) composed of plastic and having at least one aspherical surface, and a third lens element (L3) also composed of plastic and having at least one aspherical surface. L1 has substantially more optical power than either L2 or L3, e.g., .vertline.f.sub.L2 .vertline./f.sub.L1 and .vertline.f.sub.L3 .vertline./f.sub.L1 are each above 1.3. In this way, the lens system is easily fabricated and is relatively insensitive to changes in temperature of the lens elements.

Abstract: An apparatus for creating an illusion in which a setting is superimposed around a real image rather a reflected image being superimposed into the middle of the setting as is traditionally the case. More particularly, rather than images being superimposed into a setting by using a beam splitter in the traditional manner, a real, not a reflected image, is used and the setting is superimposed around the real image. In the apparatus of the invention, there are no dead or hidden areas and set proportions are not dictated by the angle of a beam splitter. Additionally, viewing angles do not dictate audience position and, so long as the audience can see inside the setting, the illusion can be created.