Abstract: A light-source cooling device is provided that, without adopting a complex configuration, is capable of reducing the temperature difference between the top portion and bottom portion of a light source despite change of the installation orientation. The light-source cooling device of the present invention for cooling a light source (11) is provided with: two ventilation ducts (4and 5) for guiding cooling airflows (13a and 13b) to strike against the light source (11) from opposite directions, and two fans (2and 3) for impelling the cooling airflows (13a and 13b) to two airflow guide units (4and 5).

Abstract: A display apparatus is capable of displaying a distortion-free projected image based on an image signal from a computer. The display apparatus receives an image signal from the computer and projects an image depending on the image signal onto a projection surface. The display apparatus includes a setting section which sets identification information representative of an aspect ratio of a display of the computer. The identification information set in the setting section can be changed by the user.

Abstract: An image determination section determines whether an input image signal represents a bright image or a dark image. A control section switches between a first lighting mode in which the output of a power supply section is a first power value and a second lighting mode in which the output of power supply section is a second power value based on the determined result of the image determination section. The control section refers to a first table that contains data representing the relationship between the power value of the power supply section and the number of rotations of a cooling fan in the case in which the output of the power supply section is increased from the second power value to the first power value at a constant rate when the second lighting mode is switched to the first lighting mode.

Abstract: In the disclosed backlight unit, multiple LEDs are arranged as a light source at prescribed intervals on a substrate in a rectangular ring. Light irradiated from the LEDs is diffused through a lens, a prism plate and a diffusion plate, and is transmitted to a liquid crystal panel. There are roughly V-shaped concavities in the incidence surface of the lens, and triangular cross-section prisms for diffusing incident light are further arranged on the incidence surface of the prism plate. The LEDs are arranged on a highly thermally conductive LED cooling pattern, and the LED cooling pattern is in contact with a heat-dispersion housing. For that reason, heat emitted by the LEDs is conducted from the LED cooling pattern to the housing and dispersed to the ambient air. By this means, the backlight unit can save energy and be more compact.

Abstract: A fixing structure for a display panel includes first, second, and third chassis members. The first chassis member includes a first corner securing portion secured to two side surfaces on an outer periphery side of a first corner portion of the display panel. The second chassis member includes a second corner securing portion secured to two side surfaces on an outer periphery side of a second corner portion of the display panel adjacent to the first corner portion. The third chassis member includes an opposing side securing portion secured to a middle portion of a side surface on an outer periphery side of the display panel that opposes a side surface on an outer periphery side that is sandwiched between the first corner portion and the second corner portion. The first, second, and third chassis members are coupled to each other at a back surface side of the display panel.

Abstract: A liquid crystal display apparatus according to the present invention includes: a liquid crystal panel; a backlight provided on a rear face of the liquid crystal panel; a detector which detects RGB output light levels of the backlight; a first controller which controls backlight current for driving the backlight so that a prescribed luminance is attained based on the RGB output light levels detected by the detector; and a second controller which controls display signals supplied to the liquid crystal panel so that a prescribed chromaticity is attained based on the RGB output light levels detected by the detector.

Abstract: Unnecessary flare correction at the boundary between a blanking area and video signal area is suppressed. An image quality improving apparatus includes 2-dimensional low-pass filter circuit 2 that extracts low-frequency components from an input video signal; subtractor circuit 4 that obtains high-frequency components by subtracting the low-frequency components extracted by 2-dimensional low-pass filter circuit 2 from the input video signal; and adder circuit 6 that adds the high-frequency components obtained by subtractor circuit 4 as a correction signal to the input video signal. The input video signal contains blanking signals without any video information. 2-dimensional low-pass filter circuit 2 starts extraction of the low-frequency components after a lapse of a predetermined unit time from when the input video signal changed from the blanking signal to the signal that contains the video information.

Abstract: An illumination apparatus used in non-light emission transparent display devices includes a base material, light emitting elements arranged two dimensionally on the surface of the base material, a drive section driving the light emitting elements, and a light emitting intensity control section controlling a light emitting intensity of the light emitting elements. An arrangement of the light emitting elements is such that a density at ends of the base material is high compared to that in a center part thereof, and the ends have a high density in regions where the base temperature is high and the center part has a high density in regions where the base material temperature is high.

Abstract: The present invention is directed to an image information detecting device that detects image light, and includes an image information detecting member that includes a detection surface having a light receiving sensor that detects image light, and a pressing member that is connected at one end thereof to the image information detecting member, and is provided so as to protrude from an other surface side which is opposite to the detection surface side.

Abstract: A light source lamp cooling apparatus according to the present invention includes: diaphragm air compressor (31); an ejector which ejects cooling air directly onto a portion to be cooled of a light source lamp in lamp unit (10); pressure detector (43) which detects pressure of the cooling air by means of pressure sensor (42) inserted in piping; air piping which connects air compressor (31) and the ejector; and a lamp controller which controls turning off of the light source lamp according to the air pressure detected by pressure detector (43). Air compressor (31) is driven at a high control frequency and a hollow, flexible silicon tube is used as air piping to reduce pulsation of air.

Abstract: A projector includes a plurality of light source boxes (1R, 1G, 1B) each accommodating at least one solid-state light source, emission colors of accommodated solid-state light sources being different from each other, a plurality of photodetectors (205c, 206c, 207c) that are provided within respective light source boxes and that detect light from the solid-state light sources, a plurality of drive units (202 to 204) that supply current to solid-state light sources (205b, 206b, 207b) provided within respective light source boxes, and a controller (201) that holds a reference value for the solid-state light source provided within each light source box for each emission color, that causes each drive to supply current to the solid-state light source provided within each light source box, and that adjusts the amount of current output from each drive unit such that the output value of each photodetector is at a reference value which corresponds to the emission color of the solid-state light source which is a corresp

Abstract: A conferencing system prevents useless data processing that accompanies data communication from occurring even when a presenter's device that outputs image data is switched. A projector functions as a node in a tree structural network, and projects an image corresponding to image data and sends the image data to the direct child indicated in parent-child information when receiving the image data from the direct parent indicated in the parent-child information. A switching module, when receiving a switching request for making a request to switch a parent-child relationship from the direct child, sends the switching request to the direct parent, when receiving permission information representing permission to switch from the direct parent, sends the permission information to the direct child that sent the switching request and changes the parent-child information so that the direct parent becomes the direct child and the direct child that sent the switching request becomes the direct parent.

Abstract: The present invention seeks to realize an illumination optical system that has low etendues, a longer operating life and a higher brightness. The illumination optical system comprises: a laser light source that generates an excitation light; a fluorescent substance that generates a fluorescent light in response to the excitation light, a light tunnel that outputs the excitation light input at one end thereof to the fluorescent substance from the other end thereof, and that outputs the fluorescent light generated by the fluorescent substance from the one end thereof; and an optical element that is placed within a light path between the laser light source and the light tunnel, and that reflects the excitation light, but allows the fluorescent light to pass therethrough.