North American Philips Corporation

Philips Electronics North America Corporation

U.S. Philips Corporation

North American Philips Consumer Electronics Corp.

William F Guerinot

Ralph H Bradley, Jr

Peter J Janssen

Jill F Goldenberg

Thomas S McKechnie

Jeffrey Arthur Shimizu

Joseph P Bingham

Detlev Otto

Stephen T Troemel

Joshua D Eskin

Robin B Rumbolt

William J O'Grady

Daniel J Dargis

Leendert Vriens

A color projection video system utilizing only a single light valve. A white light source is separated into into red, green and blue bands. Scanning optics cause the RGB bands to be sequentially scanned across a light valve, such as a transmission LCD panel. Prior to each color passing over a given row of panels on the light valve, that row will be addressed, by the display electronics with the appropriate color content of that portion of the image which is being displayed. The image is projected by a projection lens onto a viewing surface, such as a screen. The sequence of light bands occurs so quickly as to give the viewer an appearance of simultaneous full color.

Single panel color projection video display

A color projection video system utilizing only a single light valve. A white light source is separated into into red, green and blue bands. Scanning optics cause the RGB bands to be sequentially scanned across a light valve, such as a transmission LCD panel. Prior to each color passing over a given row of panels on the light valve, that row will be addressed, by the display electronics with the appropriate color content of that portion of the image which is being displayed. The image is projected by a projection lens onto a viewing surface, such as a screen. The device includes circuitry to synchronize the illumination of the light valve with the video signal and to minimize video breakup when changing video sources.

Single panel color porjection video display having control circuitry for

Single panel color projection video display having control circuitry for

A video projection system using a light modulating display device having a row and column matrix of picture elements is improved by imparting an oscillatory motion to the display image in the plane of the image, to thereby reduce the visibility of the individual picture elements of the matrix. The resolution of the image can be increased by displaying different video information at different parts of the oscillatory cycle.

Projection system having image oscillation

A two-source illumination system includes a reflective array of elements deflectable to first and second positions in response to a drive voltage, and two sources pointed at the array from different angles, so that upon cycling the elements rapidly back and forth between the two positions, and alternately cycling the sources between on and off conditions synchronously with the cycling of the reflective array, light from both sources is (alternately) reflected back along an axis normal to the array. This arrangement allows driving the sources at a higher power level, resulting in a higher total light output from the system than would be possible with a single source driven constantly at a lower power level.

Two-source illumination system

A video color image projector which includes a block of crossed dichroic mirrors for combining the light rays from image rasters on respective monochrome image display devices and a projection lens for projecting the composite color rays so as to form an enlarged color image on a display screen. Each display device has a faceplace which is convex on the interior surface thereof and having thereon an interference filter in the form of an internal angularly reflecting coating (IARC). Each faceplate is liquid - coupled to a negative power lens element, so that the faceplate, coupling liquid (or gel) and such lens element effectively constitute a single negative power field flattener lens at each entrance side of the dichroic block. The composite color rays at the exit side of the dichroic block are projected on the display screen by an assembly of lens elements which includes at least one optically positive lens element. The focal length of the complete projection lens formed by such assembly and each of the negative field flattener lenses may be from 0.5 to 0.9 times the diagonal D of the image raster on each display device, so that the projector is sufficiently compact to be included in a cabinet suitable for consumer television receivers.

Short focal length video color projector employing dichroic mirror block

The present invention is directed to illumination structures useful in display systems for projection video and television devices performing with high efficiency and good color rendition. Such illumination sources include a light source having an inner and outer envelope with plane mirrors within the outer envelope to direct reflected light, a light source providing randomly polarized light with polarizing structure for passing a desired polarization of the polarized light, and an arc lamp having at least two arcs for supplying uniform illumination in two dimensions. These illuminating structures enable significantly improved illumination in the appropriate projection video and television systems.

Illumination system for LCD projection television

A circuit for correcting raster distortion on a CRT display screen. Horizontal distortion is corrected by overscanning and providing complementary modification of the time delay and data rate at which digital video data is supplied to the CRT during each scanning line. The video data for a given scanning line is stored in a line store, read-out therefrom being controlled by a microprocessor programmed to determine the necessary time delay and data rate of such read-out. Vertical distortion, affecting scanning lines in the vicinity of the top and bottom of the raster, is corrected by storing in a multiline store the video data for all such scanning lines. The same or a further microprocessor is programmed to re-assign the video data for pixels on each of such lines to vertically corresponding pixels on others of the scanning lines, such re-assignments being complementary to the vertical distortion of the original scanning lines.

CRT raster distortion correction circuit

A wide screen television monitor capable of displaying standard width picture in which uneven 'Coulomb aging' is minimized. The television monitor includes circuitry for causing the standard width picture to cyclically traverse the width of the display screen of the television monitor in accordance with a prescribed function. The period of repetition of this movement is of such a duration that a casual observer of the television monitor is unaware of the movement of the picture.

Dual aspect ratio display with cyclicly moving raster area to prevent

Display systems useful for projection video and television systems are provided to perform with high efficiency and good color rendition. In these systems, color may be provided, as one example, by various light valves, such as liquid crystal displays. Each of the liquid crystal displays are positioned at equal path distances from an illuminating subsystem, and have equal path distances from the light valves to a projection subsystem. This enables optimum illumination of each of the light valves. Various embodiments of arranging the light valves, as well as providing illumination are described.

Display system with equal path lengths

A remote control transmitter, preferably a universal or reconfigurable remote control transmitter, is incorporated into a television receiver. Mounting a light emitting source such as a light emitting diode in a line of sight or a wired connection with an external tuning system such as that of a VCR or cable converter, and modification of the television tuning system to cause the transmission of activating signals to the remote control transmitter, allows functions which are channel associated and which are therefore generally suppressed when a remote tuning system is used to remain in force.

Television customer control functions restorer

A one-piece projection screen with improved overall efficiency and contrast, the elimination of corner illumination deficiencies and undesirable image artifacts. The optical power of the screen is divided between two or more surfaces acting as Fresnel lenses, and the region or medium separating the surfaces has a different index of refraction than that of the mediums upstream or downstream of the surfaces. The preferred embodiment of the projection screen includes a diffuser and a lenticular array downstream of the surfaces.

One-piece projection screen

LCD color television front projection screen has a rear vertically oriented lenticular lens array, the sidewalls of the lenticules steeply inclined to achieve total internal reflection of rays from a projected image into tip regions of the lenticules, an external reflective surface behind the array for reflecting the projected rays back into an audience field in front of the screen, and black masking between the lenticules for absorbing ambient rays.

Growing community of inventors

Knoxville, TN, United States of America

William F Guerinot