Abstract: A display apparatus that displays an image on a retina of a user, the display apparatus comprising: an image output unit (100) which includes a light source (101, 110), a wavefront shape change unit (102, 109), and a scan unit (103, 108) and is configured to output display light for displaying the image; and a deflection unit (104, 107) configured to deflect, toward an eye of the user, the display light outputted by the image output unit (100). The deflection unit (104, 107) has a deflection characteristic of suppressing image distortion caused by a change in relative position of the deflection unit (104, 107) with respect to a pupil of the user.

Abstract: A projector has: light source (1R, 1G, 1B); a light modulation unit (6) that modulates a light emitted from the light source based on image signals; a display control unit (41) that outputs the image signals including main cyclic image signals to the light modulation unit, and controls the display thereof; a projection unit (7) that projects the image based on the light modulated by the light modulation unit; and an imaging unit (40) that captures an image to be displayed based on the light projected from the projection unit, and the display control unit inserts a correction image signal for projecting a correction image, which is visually recognized as a uniform white or gray screen when time integration is performed, between the cyclic main image signals.

Abstract: A liquid crystal display device includes a reflective color filter arranged to intersect with an optical path of light emerging from a principal surface of a light guide plate, and a recycle portion arranged at a side of the light guide plate opposite to the reflective color filter. Out of light incident on the light guide plate, light reflected by the reflective color filter is returned to the reflected color filter again by being reflected by the recycle portion via the light guide plate.

Abstract: A surface illumination apparatus has: a plurality of light sources (12a, 12b) which emit lights; a light guiding plate (15) which allows the lights emitted from the light sources to enter through one of the side faces and emits the lights through one principal plane; a polarizing filter (19) which transmits lights in a predetermined polarizing direction and reflects lights in a polarizing direction perpendicular to the predetermined polarizing direction; a polarizing modulation plate (18) which performs predetermined modulation on the polarizing characteristics of the incident lights; and a reflection sheet (17) which regularly reflects the incident light.

Abstract: Provided is a planar illuminating device having light source section (1) emitting linearly polarized laser light and having a light guide (12) with a rectangular parallelepiped shape having one main surface with a mirror array (12c) thereon. The mirror array (12c) has a plurality of reflecting surfaces totally reflecting laser light incident on an incident surface (12a), of the light guide, perpendicular to the one main surface and emits the laser light from an emitting surface (12b), of the light guide, perpendicular to the one main surface, wherein the reflecting surfaces are formed in a stepped manner. Further, the planar illuminating device includes a light-guiding plate (3) making the laser light, emitted from the light guide (12), incident on an incident surface (3a) of the light-guiding plate and emitting the laser light from an emitting surface (3b) of the light-guiding plate.

Abstract: A planar illumination device is provided with a plurality of light guide paths, on which scanned light in different scanning sections of a scanning range by a scanning unit is respectively incident, and an illumination unit having a plurality of emission regions for emitting the light guided by the respective light guide paths. The number of the emission regions is 2 or more and 1000 or less, and the respective emission regions successively become luminous as the scanned light is incident on the respective light guide paths.

Abstract: There is provided a laser projector, including: a laser source section for emitting laser beams; a spatial light modulator which modulates the laser beams to generate image light; a projector lens from which the image light is emitted; a beam shaper which shapes the laser beams into a shape of the spatial light modulator; and a pupil uniformizer which makes a light intensity distribution uniform at an exit pupil of the projector lens, wherein the pupil uniformizer is situated between the laser source section and the beam shaper.

Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.

Abstract: A compact multi-band hybrid ring (rat-race) coupler utilizing a ring of composite right-handed and left-handed (CRLH) transmission lines (TLs) and multiple ports, provides miniaturization and the ability to operate at arbitrary frequency bands unlike conventional couplers. The hybrid ring is made compact, such as by constraining phase delay contributions |?1|, |?2|?270°. The coupler can be used in many applications, for example as a mode decoupling network in a dual-band front-end MIMO system. The inclusion of a CRLH delay line is also described which alters the phase relationship of the signals and is particularly well suited for extending pattern diversity in response to frequency.

Abstract: A laser illuminating device and an image display device are provided to enable a removal of speckle noises in a diffraction field and an image field, to uniformly illuminate an illumination plane, and to realize miniaturization. The laser illuminating device 100 includes a laser light source 3 and a first lens 1 including a plurality of microlenses 10, each having a predetermined numerical aperture in an in-plane direction, and each of the microlenses 10 being adapted to expand laser light emitted from the laser light source 3 to thereby superimpose the laser light transmitted through each of the microlenses 10. The laser illuminating device 100 also includes a second lens 2 having an effective diameter larger than an effective diameter of the first lens 1, and compensating for a divergence angle of the laser light expanded by each of the plurality of the microlenses 10.

Abstract: A planar illumination device 10 is provided with a laser light source 11 for emitting laser light, a light source side bundle fiber 12 having one end surface thereof optically connected with the laser light source 11, a flat light guide plate 13, a plurality of connection side fibers 16 planarly arranged in parallel with each other at a side surface of the light guide plate 13, and a light guiding fiber 14 for guiding the laser light from the light source side bundle fiber 12 to the plurality of connection side fibers 16. The laser light is incident on the side surface of the light guide plate 13 from the plurality of connection side fibers 16 via a plurality of fiber collimators 17 and output light is uniformly emitted from one principal surface of the light guide plate 13.

Abstract: A wavelength conversion device includes an excitation light source (11) that generates excitation light, a laser medium (12) that generates fundamental light by means of the excitation light, two resonator mirrors (13) that are disposed with the laser medium (12) being interposed therebetween and resonate the fundamental light, a wavelength conversion element (14) that is disposed between the two resonator mirrors (13) and wavelength-converts the fundamental light to harmonic light, and a drive unit (15) that generates a pulse modulation signal to pulse-drive the excitation light source (11). The laser medium (12) is formed of a material having a thermo-optical effect and a positive thermo-optical constant. The pulse modulation signal generated by the drive unit (15) has an initial interval (P1) including a rising edge of a pulse and a remaining interval (P2) subsequent to the initial interval.

Abstract: A projector for projecting an image light including: a laser light source for emitting a laser beam; a light modulator for modulating the laser beam to generate the image light; a projection portion for projecting the image light; a detector for detecting a fixation degree of the projector; and a controller for controlling the power of the image light on the basis of the fixation degree.

Abstract: A semiconductor laser light source emits a laser beam for pumping. An optical resonator includes a solid laser crystal to be excited by the incident of a laser beam to oscillate a fundamental wave and a pair of fundamental wave reflective coats arranged at the opposite sides of the solid laser crystal. A wavelength conversion element converts the fundamental wave into a plurality of harmonics. The wavelength conversion element is so arranged in the optical resonator that the optical axis of at least one of the plurality of harmonics, generated in the optical resonator is made different from that of the fundamental wave and the at least one harmonic whose optical axis is made different is output substantially in the same direction as the other harmonic. By this construction, it is possible to stabilize a harmonic output and utilize a plurality of harmonics without increasing the number of parts.

Abstract: A planar illumination device for illuminating a liquid crystal display panel provided with a polarizing plate on a light incident side, includes: a light source unit for emitting light having a specified polarization direction; and a light irradiating member for deflecting light emitted from the light source unit and irradiating the liquid crystal display panel with the deflected light, wherein the light irradiating member deflects the light emitted from the light source unit such that the polarization direction of the light emitted from the light source unit substantially coincides with a transmission axis direction of the polarizing plate of the liquid crystal display panel.

Abstract: High-frequency couplers and coupling techniques are described utilizing artificial composite right/left-handed transmission line (CRLH-TL). Three specific forms of couplers are described; (1) a coupled-line backward coupler is described with arbitrary tight/loose coupling and broad bandwidth; (2) a compact enhanced-bandwidth hybrid ring coupler is described with increased bandwidth and decreased size; and (3) a dual-band branch-line coupler that is not limited to a harmonic relation between the bands. These variations are preferably implemented in a microstrip fabrication process and may use lumped-element components. The couplers and coupling techniques are directed at increasing the utility while decreasing the size of high-frequency couplers, and are suitable for use with separate coupler or couplers integrated within integrated devices.

Abstract: A compact multi-band hybrid ring (rat-race) coupler utilizing a ring of composite right-handed and left-handed (CRLH) transmission lines (TLs) and multiple ports, provides miniaturization and the ability to operate at arbitrary frequency bands unlike conventional couplers. The hybrid ring is made compact, such as by constraining phase delay contributions |?1|, |?2|?270°. The coupler can be used in many applications, for example as a mode decoupling network in a dual-band front-end MIMO system. The inclusion of a CRLH delay line is also described which alters the phase relationship of the signals and is particularly well suited for extending pattern diversity in response to frequency.

Abstract: A wavelength conversion laser device includes a laser light source which emits a laser beam, two reflective surfaces which reflect therefrom a laser beam, a wavelength converter provided between the two reflective surfaces, which converts a laser beam into a wavelength-converted laser beam, and condensing optics which condense the laser beams to be injected between the two reflective surfaces, wherein at least one of the two reflective surfaces has a curvature for reflecting a laser beam to be re-injected into the wavelength converter between the two reflective surfaces repeatedly while forming multi paths of laser beams injected into the wavelength converter at different incident angles, and the condensing optics are arranged to disperse beam waists of the laser beams in the wavelength converter, which reciprocate between the two reflective surfaces.

Abstract: A surface illumination device is provided with a laser light source capable of emitting a laser light, an incident surface on which the laser light is incident, a light guiding plate having a principal surface from which the laser light emerges as a surface emergent light, and an irradiating member capable of irradiating the laser light from the laser light source over a specified range extending in the longitudinal direction of the light guiding plate.

Abstract: A laser display device, which is capable of ensuring the safety of a person's eyes and reducing speckle noise even when a screen is arranged at an arbitrary position, includes a laser light source emitting a laser light, a modulator modulating the laser light and emitting a modulated light, and a branching unit branching the modulated light into a plurality of branched lights. Further, at least two of the plurality of branched lights reach same positions on a screen at substantially same timings.