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: An image display device comprises a frame arranged along the periphery of display screen and a plurality of detectors mounted on the frame, each for generating a detection signal in response to an object positioned outside of the frame. Each of detectors generates a detection signal indicative of the distance to an object that is present in a direction associated therewith. A control circuit selects a detection signal indicative of the shortest distance of the detection signals. The control circuit controls the direction of an image that is displayed on a display screen such that the bottom of the image is moved to a side corresponding to the detector that generates the selected detection signal.

Abstract: A liquid crystal projector apparatus has a liquid crystal unit having a liquid crystal panel for modulating light, an incident side polarizing plate and an exit side polarizing plate disposed in front of and behind the liquid crystal panel along the optical axis, respectively, a first holder member for holding the liquid crystal unit, a first heat exchanger disposed in close proximity to the first holder member for dissipating heat generated by the liquid crystal unit and then conducted to the first holder member using a coolant liquid which passes through a first channel formed inside the first heat exchanger, a pump for circulating the coolant liquid, and a radiator for cooling the coolant liquid.

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 cooling apparatus includes a tank for keeping a coolant liquid therein and having an air layer, a heat receiving element in contact with a heat generating part to receive heat therefrom, a radiator for radiating heat absorbed by a coolant liquid, and a circulating mechanism for circulating the coolant liquid from the heat receiving element through the tank and through the radiator again to the heat receiving element. The tank has a conduit forming area for forming a coolant liquid circulating conduit to pass through a middle position of the tank, and a narrow gap which divides the conduit forming area at the middle position of the tank.

Abstract: A projection display apparatus has a light source, an image forming device for modulating light emitted from the light source with an image signal supplied thereto, and a reflective optical system for magnifying and projecting an image generated by the image forming device. The reflective optical system has a first reflecting mirror for reflecting light emitted from the image forming device and initially applied thereto, and a plurality of reflecting mirrors for successively reflecting the light reflected by the first reflecting mirror. The first reflecting mirror has a spherical reflecting surface, and a normal line passing through the crest of the spherical reflecting surface and a normal line passing through the image forming device extend nonparallel to each other.

Abstract: A liquid crystal projector apparatus has a liquid crystal unit having a liquid crystal panel for modulating light, an incident side polarizing plate and an exit side polarizing plate disposed in front of and behind the liquid crystal panel along the optical axis, respectively, a first holder member for holding the liquid crystal unit, a first heat exchanger disposed in close proximity to the first holder member for dissipating heat generated by the liquid crystal unit and then conducted to the first holder member using a coolant liquid which passes through a first channel formed inside the first heat exchanger, a pump for circulating the coolant liquid, and a radiator for cooling the coolant liquid.

Abstract: A transportable projector includes a focus adjustment unit for moving a focus lens in a projection lens, an acceleration sensor for detecting acceleration in a direction along an optical axis of the projection lens in the projector, a determination unit for determining whether the projector is in a stationary state or in a moving state in accordance with an output of the acceleration sensor and for respectively determining the direction to which the projector has moved and the distance that the projector has moved in accordance with an output of the acceleration sensor, and a control unit for controlling movement of the focus lens by the focus adjustment unit in accordance with the determined direction and the determined distance of the projector.

Abstract: A projector apparatus has a projection device for projecting an image onto a projection surface; at least two displacement sensors for detecting horizontal displacements of the projector apparatus, the displacement sensors being spaced a predetermined distance from each other; a rotational angle calculator for calculating a rotational angle of the projector apparatus in a horizontal plane using the predetermined distance and the horizontal displacements, the horizontal displacements being detected by the displacement sensors; and a distortion corrector for correcting distortion of the image by using the rotational angle, the image being projected by the projection device, wherein the rotational angle is calculated by the rotational angle calculator as a horizontal corrective angle.

Abstract: An apparatus for transmitting image data through a network has an image rendering unit, an image processing device, a memory device, and an image transmitter.

Abstract: Picture signals that indicate a screen that are supplied as output from a signal generation source are divided by a picture splitting device into picture signals of a plurality of screens for displaying a large screen and then supplied to a gradation conversion LUT unit in a luminance correction circuit. Based on display position information from a timing circuit, a coefficient arrangement control unit implements a non-linear arrangement of gain coefficients for gradation control that is carried out in picture element units. Based on the display position information from the timing circuit, the gradation conversion LUT unit adjusts display positions such that areas in which the projected display areas of the plurality of projectors overlap match with areas that are the objects of gradation conversion, and implements a luminance level conversion in picture element units of input signal levels of picture signals that have been split using the arrangement of gain coefficients for gradation control.

Abstract: A projection display apparatus generates image light by modulating, with an image signal, light emitted from a light source disposed in a lamp house, and projects the generated image light onto a screen. The projection display apparatus has an air inlet duct for introducing air, to cool the light source, into the lamp house and an air outlet duct for expelling the air discharged from the lamp house out of the projection display apparatus. The air outlet duct has an opening defined in a side wall thereof, and a lid pivotally mounted thereon for selectively opening and closing the opening. The lid is not opened under normal pressure in the air outlet duct when the light source operates normally, and is opened when an abnormal pressure buildup higher than the normal pressure is applied to the lid, thereby releasing the pressure buildup.

Abstract: A projection display apparatus comprises a liquid crystal unit assembly which includes a liquid crystal panel, an incident side polarizing plate and an emitting side polarizing plate which are arranged on an incident side and on an emitting side of the liquid crystal panel, respectively, and a color combining prism. The apparatus further comprises a fan; a duct which is connected to the fan and which is provided with an opening for supplying cooling air, wherein the opening is arranged near the liquid crystal panel and the incident side polarizing plate; a holder for holding the emitting side polarizing plate and the color combining prism; and a heat exchanger which is connected to the holder, wherein the heat exchanger uses liquid coolant.

Abstract: In lamp unit 10 having light source lamp 1, reflector 2 for reflecting light from light source lamp 1, reflector holding member 11, and reflector cover 15, a plurality of cooling holes 18a are formed in a region of reflector holding member 11 provided with lamp unit positioner 16a. Cooling holes 18a are open toward an upper bulb area, a lower bulb area, and a cathode of the light source lamp, respectively. Stud 22a for fixing reflector holding member 11 has a throughhole extending at the center thereof, so that cooling air fed from high static pressure blower 27 can be sent to cooling holes 18 through tube 28 and the throughhole of stud 22a, thus efficiently cooling the upper bulb area, lower bulb area, and cathode of light source lamp 1 in a concentrative manner with a small amount of air. Thus, the resulting lamp unit, provided by the present invention, can reduce the amount of air required for cooling the lamp, and can use a high static pressure and small fan.

Abstract: A projector has a transmission time information reception unit for calculating the distances between a transmitter and first and second ultrasonic receivers based on reception times of ultrasonic and infrared pulses transmitted from a transmitter-equipped pointer rod for pointing to positions on a projection surface. The projector also has an image correcting information calculation unit, which, when a test pattern made up of a plurality of reference points including a plurality of points near the corners of the upper and lower edges of the projection surface is projected onto the projection surface, generates a coordinate transformation table to bring the coordinates of the reference points near the upper edge into conformity with the coordinates of corresponding desired corrective points, from the distance information acquired by the transmission time information reception unit through the transmitter-equipped pointer rod and positional information of the desired corrective points.

Abstract: A field delay circuit aligns the phases of two field signals. An average value calculation circuit generates an average value signal of the two field signals. This average value signal can be regarded as a signal that has undergone a one-dimensional low-pass filter process in the row direction in which the number of taps for a progressive signal is 2 and the filter coefficient for each tap is 0.5 and that has then been thinned to one-half the data. A two-dimensional LPF circuit subjects this average value signal to a low-pass filter process and eliminates the high-frequency components (edge components). A subtraction circuit subtracts the average value signal that has undergone the LPF process from each field signal and thus extracts the edge components of each field signal. An amplification circuit multiplies the edge components of each field signal by a prescribed factor. An addition circuit adds the resulting amplified edge components to each field signal.

Abstract: An average value signal of the G two-phase input signal is generated by means of an average value calculation circuit. This average value signal is regarded as a signal in which a one-dimensional low-pass filter process, in which the number of taps is 2 and the filter coefficient for each tap is 0.5, has been carried out for a single-phase signal and the number of items of data then thinned to one half. A two-dimensional LPF circuit next subjects this average value signal to a low-pass filter process to eliminate the high-frequency component (edge component). The average value signal that has undergone the low-pass filter process is then subtracted from the input signal of each phase to extract the edge component of the input signal of each phase. An amplification circuit then multiplies the edge component of the input signal of each phase by a prescribed factor, and an addition circuit next adds this multiplied edge component to the input signal of each phase.

Abstract: A rotary operation mechanism is provided with: a gear that is rotatably provided in the apparatus main unit of an electronic apparatus that is provided with an apparatus main unit and an outer case that covers this apparatus main unit; a rotating knob for effecting the rotary operation of this gear; and an opening that is provided in the outer case and into which the rotating knob is inserted. The rotating knob is supported in the outer case in a state of engagement that allows free rotation inside the opening. The rotating knob is provided with a first rib at a position that is separated in the radial direction from the center of rotation, and the gear is provided with a second rib that forms a gap in which the first rib is interposed and that thus makes line contact with and engages with the first rib.

Abstract: A projector includes a projection device, a cross line positional information acquiring device for acquiring positional information of a cross line between a projection surface of the projection device and a plane crossing the projection surface, an inclination detecting device for calculating an angle of inclination between a projection optical axis of the projection device and the projection surface based on the positional information acquired by the cross line positional information acquiring device, and an image distortion correcting device for correcting a trapezoidal distortion of an input image supplied to the projection device, based on the angle of inclination calculated by the inclination detecting device.

Abstract: A cooling apparatus comprises a tank for keeping a coolant liquid therein and having an air layer, a heat receiving element in contact with a heat generating part to receive heat therefrom, a radiator for radiating heat absorbed by a coolant liquid, and a circulating mechanism for circulating the coolant liquid from the heat receiving element through the tank and through the radiator again to the heat receiving element. The tank has a conduit forming area for forming a coolant liquid circulating conduit to pass through a middle position of the tank, and a narrow gap which divides the conduit forming area at the middle position of the tank.