Abstract:
PROBLEM TO BE SOLVED: To provide an image display device which efficiently uses laser light to easily display an image of high luminance and high quality by a simple configuration. SOLUTION: The image display device includes laser light sources of a plurality of colors, among which at least a laser light source of one color is a multi-output laser light source provided with a plurality of wavelength-converted laser light sources of the same color, and spatially modulates laser light outputted from each laser light source by a field sequential spatial modulation element 7 to display a color image. In the image display device, a driving control device 20 controls green laser emission parts IG 1 and IG 2 being wavelength-converted laser light sources to successively output pulsed laser light so that laser light outputted from respective green laser emission parts IG 1 and IG 2 have almost the same peak power to become a continuous and approximately fixed laser output when the spatial modulation element 7 spatially modulates laser light outputted from a multi-output laser light source 10G. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a projector device capable of projecting an image of higher quality in the configuration provided with a light source consisting of a plurality of light-emitting means of different emission colors, and a light source control method of it. SOLUTION: The light source of the emission color is LEDs of the three primary colors (R-LED, G-LED, and B-LED). A plurality of lighting patterns with a single cycle of the LED of each color are stored, in correspondence with the predetermined levels of brightness. The basic mode of the plurality of lighting patterns consists of an individual lighting period a, in which the LEDs of each color are sequentially lit independently, and an entire lighting period b in which all the LEDs of each color are lit simultaneously, and the light of the three primary colors of RGB and W (white) is emitted in a time-shared manner. The time (proportion) for the entire lighting period b is differentiated, according to the corresponding levels of the brightness. At the time of projection operation, a lighting pattern corresponding to the level of the brightness of the surrounding is read out, and the lighting patterns of the LEDs of each color are switched accordingly, thereby optimizing the brightness of the projected image. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a GaN-based semiconductor light-emitting element having a structure capable of realizing high light emission efficiency in driving at high operation current density, and at the same time, realizing remarkable reduction of an operation voltage. SOLUTION: The GaN-based semiconductor light-emitting element is provided with (A) a first GaN-based compound semiconductor layer 13 having an n conductive type, (B) an active layer 15, and (C) a second GaN-based compound semiconductor layer 18 having a p conductive type. The element is further provided with (D) a underlaying layer 21 consisting of a GaN-based compound semiconductor formed between the first GaN-based semiconductor layer 13 and the active layer 15, and (E) a superlattice structural layer 22 formed between the active layer 15 and the second GaN-based semiconductor layer 18, consisting of a GaN-based compound semiconductor and containing a p-type dopant. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an illuminating optical system and a projection type display device that can be downsized and reduced in imaging magnification. SOLUTION: The optical system of the illuminating optical system 1B composing the projection type lighting system has, along its optical system, a first relay lens 3, a second relay lens 4 and a field lens 5 with a diaphragm function. The lens back face 4b of the second relay lens 4 is formed as a mirror face. A luminous flux emitted from a light source section is made incident on the lens surface 4a of the second relay lens 3 after transmitted through a rod integrator 2 and the first relay lens 3. Then, it is reflected from the lens back face 4b and emitted from the lens surface 4a. A luminous flux emitted from the second relay lens 4 is made incident on the surface of a DMD section 6 after transmitted through the field lens 5. Since the lens back face 4b of the second relay lens is a reflecting face, an optical path between the second relay lens 4 and the field lens 5 can be shortened. This constitution makes it possible to downsize the illuminating optical system 1B and projection type lighting system despite the reduction in imaging magnification. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a light beam scanning display in which a light source and optical system are miniaturized and energy is saved. SOLUTION: The light beam scanning display 100 displays a picture on a plotting face 15 by modulating laser beams from respective light sources 11r, 11g and 11b of three natural colors arranged at near positions on the basis of respective picture data and scanning the laser beams. Parallelizing means 19r, 19g and 19b are provided to parallelize the respective laser beams, the laser beams parallelized with the parallelizing means are passed through different optical paths so that the optical axes 21r, 21g and 21b of the laser beams are not superimposed, and one pixel of a plotted picture is formed on the plotting face 15. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To make a projection video display device which uses an LED light source and a light pipe in combination, wherein the problems of producing higher luminance, making it smaller in size and cost reduction and the heat radiation of a liquid crystal panel are solved. SOLUTION: The light pipe is formed as a hollow type and is utilized as a cooling air passage as well. Also, the light pipe is provided internally with a transmissible or reflective baffle plate, or the light pipe is formed by subjecting the inside surface of an optical case integrated, by fixing optical components to mirror coating. A dichroic mirror is arranged on the emission surface of the LED light source. COPYRIGHT: (C)2005,JPO&NCIPI