Abstract: A projector having a plurality of cameras for adjusting the focus of projected images, correcting projected images that are distorted and correcting projected images to match the outer profile of a screen if the screen is used as a projection object. The projector having a projection device, a projection lens, a focus adjuster, a zoom adjuster, an imager having the plurality of cameras for capturing respective images of a projection object a projection area calculator for calculating a projection area of an image depending on the distance from the projection lens based on the zoomed position from the zoom adjuster, a three-dimensional position detector for detecting the three-dimensional position of a predetermined object point corresponding to identical object points in the respective images captured by the cameras, and a distance detector for detecting the distance up to the object point from the three-dimensional position of the predetermined object point.

Abstract: A structure for protecting a rod integrator that is used for a projection display apparatus is provided. The structure has: a protecting tube for the rod integrator, the protecting tube accommodating the rod integrator therein, wherein the protecting tube has openings which are defined at positions that face a light incident surface and a light exiting surface of the rod integrator, respectively; and a light shield plate that is provided between the opening and a light source for emitting light to the rod integrator, the opening facing the light incident surface of the rod integrator, wherein the light shield plate has an opening for allowing light to pass therethrough so that the light is incident on the rod integrator.

Abstract: A structure for cooling a lamp used for a projection type display apparatus is provided. The structure comprises a lamp house for housing a lamp that is operable as a light source, said lamp house being configured to be installed in a housing of said projection display apparatus; and a fan for supplying cooling air into said lamp house. The lamp house comprises a removable lamp house cover, and an exhaust duct for said cooling air is integrated with said lamp house cover.

Abstract: A liquid crystal display device is provided which is capable of reducing flicker over all areas of a liquid crystal panel. A common voltage having a predetermined level is fed to the liquid crystal panel and a reference voltage is fed from a digital-analog converter to a liquid crystal driving circuit and an image corresponding to a pixel data signal is displayed. The pixel data signal is reversed relative to a reference voltage for every one horizontal period. The reference voltage having been adjusted so as to be higher in side portions rather than central portions in the liquid crystal panel is applied to the liquid crystal driving circuit. As a result, even if a common voltage is not made uniform through entire portions of a common electrode, adjustment can be achieved so that flicker is minimized over all areas in the liquid crystal panel.

Abstract: In a projection display device that is provided with a relay lens for converting flux that is emitted from a light source to a parallel flux for illuminating an image display element (DMD), and a total internal reflection prism for both directing flux that is emitted from the relay lens to the DMD and directing flux that is reflected by the DMD toward a projection lens, the relay lens is unified with the prism as a lens-integral prism by bonding the relay lens to the total internal reflection surface of the prism.

Abstract: The projection display device stores, in a frame memory, a shot image of a test pattern for cases where the obstacle is not represented in the region of the projection; compares, at a comparison unit, a shot image of the test pattern for the case where the obstacle is represented in the region of the projection, with the stored shot image of the test pattern in order to detect an obstacle present in the region of the projection; generates, at an image-mask enlargement-processing unit, an image mask section having a region larger than the region of the detected obstacle; and effects, at a luminance control unit, a control to reduce the luminance in the image mask section.

Abstract: A method (and apparatus) of improving an image quality of a video signal which is supplied on a frame-by-frame basis, includes extracting high frequency components associated with a video signal of an n-th frame (where n is a natural number), and adding the extracted high frequency components to a video signal of an (n+m)th frame (where m is a natural number).

Abstract: A projector has a distortion correcting circuit for correcting a distorted quadrangular projected image, which is projected onto a projection surface along a projection optical axis inclined in at least one of leftward, rightward, upward, and downward directions, into a rectangular corrected image, such that one of the vertexes B, D on the opposite ends of either one of two diagonal lines of the rectangular corrected image is positioned on one side La of the outer edge of a projection range of the projected image and the other vertex on another side Lb that is positioned adjacent to the one side La.

Abstract: A projector has an image generating device for generating an image, and a housing, having the image generating device disposed therein and having an opening defined therein for emitting therethrough projection light representing the image from the image generating device. A projection mirror is mounted on an outer surface of the housing for reflecting the projection light to project the image onto a projection surface. An optical system is disposed in the opening for applying the projection light to the projection mirror. The projector also has a foreign matter detector for detecting foreign matter which enters a light path of the projection light between the optical system and the projection mirror.

Abstract: A projection type display device includes a distortion corrector for correcting a projected image for distortions when the image is projected with a projection optical axis tilted with respect to a screen. The distortion corrector comprises a tilt angle generator for finding a tilt angle of the projection optical axis, and a display image corrector for correcting the display image using the tilt angle. The display image corrector comprises a two-dimensional table for storing corrected coordinates for four vertexes of the display image employing a vertical tilt angle and a horizontal tilt angle as variables, and a fixed point determiner for selecting one of the four vertexes as a fixed point.

Abstract: A dynamic white balance control circuit is provided which is capable of dynamically setting a white balance and/or a color temperature according to a level of an input image signal. The dynamic white balance control circuit has a color component detecting circuit to-detect a difference between a black and white image region and a colored image region in a video signal input to output a color component detected result, a selecting circuit to select and output a white balance setting value designating a different color temperature according to the color component detected result indicating the black and white image region or the colored image region, and a white balance control circuit to calibrate a white balance of a video image input according to a selected white balance setting value and to produce a video signal output.

Abstract: A synchronization processing circuit separates synchronizing signals from an input video signal, provides the synchronizing signals to a detection circuit, and further provides the input video signal that has no synchronizing signal to a scaler circuit. The detection circuit detects the horizontal synchronization frequency, the vertical synchronization frequency, the synchronization polarity, the synchronization type (Sep, CS, or GSync), the scan type, the image line number, the synchronization type (TriSync), and the vertical synchronization width from the synchronizing signals. A CPU determines the type of input video signal based on the detection results of the detection circuit. Based on the determination results, the CPU sets the signal processing for the input video signal in the synchronization processing circuit and in the scaler circuit.

Abstract: A multiblade fan includes a case having an air intake port and an air exhaust port, an impeller disposed in said case and having a plurality of blades rotatable about the center of said air intake port, and a noise silencer fin extending substantially parallel to the opening plane of said air intake port, the noise silencer fin being disposed near the tongue of said case. The noise silencer fin suppresses excessive pressure variations and flow speed fluctuations in the vicinity of the air intake port, thereby suppressing the generation of noise.

Abstract: A projector for enlarging and projecting the display image on a light valve onto a screen is provided with: an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on the screen and that is provided with an infrared light emission device and ultrasonic generator; at least two ultrasonic receivers for detecting ultrasonic waves that are emitted by the electronic pen; means for measuring the distance to a screen; and means for supplying coordinate data in which the position of the electronic pen on the screen, which has been calculated based on output of the infrared photodetector, output of the ultrasonic generator, and output of the means for measuring the distance to the screen, has been normalized by the length of a side of a projected rectangular image that has been enlarged and projected.

Abstract: The present invention aims to provide an electronic pen that is able to prevent the reflection of an ultrasonic wave. An electronic pen according to the present invention has: a housing having a longitudinal axis and a write side tip along the longitudinal axis; at least an ultrasonic wave transmitter, the ultrasonic wave transmitter being arranged near the write side tip of the housing; and a controller for detecting a sensor orientation and for controlling transmission of the ultrasonic wave. The sensor orientation is an index that shows a rotational orientation of the housing about the longitudinal axis, the rotational orientation being directed at an ultrasonic wave sensor for receiving the ultrasonic wave that is transmitted from the ultrasonic wave transmitter. The controller selectively activates a part of the ultrasonic wave transmitter such that the ultrasonic wave is transmitted from the orientation which is directed to the sensor orientation.

Abstract: A moving image distribution system is capable of making phase adjustment of video data and audio data while preventing the cost of a display apparatus from increasing, by adjusting time information with a moving image distribution server. The moving image distribution server stores moving image data, reads the moving image data, changes information included therein as to decoding times or reproducing times of video data or audio data included in the moving image data based on a predetermined phase adjustment variable, and then distributes the moving image data. A reproducing apparatus receives the moving image data distributed from the moving image distribution server, decodes the moving image data according to the information included therein as to the decoding times and the reproducing times, and reproduces the moving image data.

Abstract: A projection type display apparatus, wherein a common case can be used for housing an illumination optical system even when a shape of an image display element and an optical path length in a prism are different, is provided: wherein a light source for emitting an illumination light, an image display device, an illumination optical system for irradiating the illumination light from the light source to the image display device, and a projection optical system for projecting an image formed by said image display device are provided; the illumination optical system comprises a first fly-eye lens and a second fly-eye lens arranged at each other's focal points, a first lens group and a second lens group arranged over a mirror for bending an optical path; the first and second lens groups have a same focal length but a different back focus; and predetermined condition formulas are satisfied.

Abstract: A projection display apparatus has: a TIR prism having a first prism surface, a second prism surface, and a third prism surface; a projection lens which is disposed opposite to the first prism surface; and an image display device which is disposed opposite to the second prism surface. The image display device reflects incident light in a first direction or in a second direction in accordance with an image signal. The first, second, and third prism surfaces are formed so as to define a modulated light path, wherein the light is reflected in the first direction, then is incident on the second prism surface, then is totally reflected internally on the third prism surface, then exits from the first prism surface, and then is incident on the projection lens along the modulated light path.

Abstract: Upon receipt of an MPEG stream, a time information converter modifies the PTSs of the audio data in the stream so that the timing for outputting the audio sound is delayed by the amount of time that is required for the processing of the video signal to be performed in a video signal processor while keeping the PTSs of the video data in the stream unchanged.

Abstract: A display panel driver includes: a clock generator for generating a clock signal; a horizontal reference generating circuit having a first frequency divider for dividing the frequency of the clock signal; a vertical reference generating circuit having a second frequency divider for dividing the frequency of the output from the first frequency divider; a switch circuit having one input terminal to which an external vertical synchronizing signal is supplied and having another input terminal to which the output signal from the second frequency divider is supplied and which selectively output one of said input terminals; and a CPU, when switching between the input terminals of the switch circuit is performed, alters the oscillation frequency of the clock generator or the frequency division ratio at the first frequency divider.