A projection-type display apparatus synthesizes and emits light emitted from a plurality of liquid crystal devices with a projection optical system. Provided that a liquid crystal at an inner side of a seal material in the plurality of liquid crystal devices is V1 in volume and a liquid crystal in a display region is V2 in volume in the plurality of liquid crystal devices, in a second liquid crystal device (a liquid crystal device for blue light) on which light having a wavelength shorter than the wavelength of light being incident on a first liquid crystal device (a liquid crystal device for green light) is incident on the display region, a liquid crystal volume ratio V1/V2 is greater than that of the first liquid crystal device, among the plurality of liquid crystal devices.

An amplified spontaneous emission, ASE, source device combining a superluminescent light emitting diode, SLED, with a semiconductor optical amplifier, SOA, the SLED and SOA being arranged in series so that the SLED acts as a seed and the SOA acts as a broadband amplifier for the SLED output. Both SLED and SOA have a structure made up of a succession of epitaxial semiconductor layers which form a waveguide comprising a core of active region layers and surrounding cladding layers. The SLED and SOA confinement factors of the SLED and SOA, wherein confinement factor is the percentage of the optical mode power in the active region layers, is designed so that the SLED confinement factor is greater than that of the SOA by at least 20%. This allow higher power outputs, because the SLED power limits imposed by the onset of non-linear effects and catastrophic optical damage can be circumvented.

A projection display device comprising a light source and an SBG device having a multiplicity of separate SBG elements sandwiched between transparent substrates to which transparent electrodes have been applied. The substrates function as a light guide. A least one transparent electrode comprises a plurality of independently switchable transparent electrode elements, each electrode element substantially overlaying a unique SBG element. Each SBG element encodes image information to be projected on an image surface. Light coupled into the light guide undergoes total internal reflection until diffracted out to the light guide by an activated SBG element. The SBG diffracts light out of the light guide to form an image region on an image surface when subjected to an applied voltage via said transparent electrodes.

A light source apparatus includes first and second optical elements, a support member to which the elements are fixed and supported, a first heat dissipation member to which the first optical element is connected, a second heat dissipation member to which heat of the second optical element is transferred, a heat transport member transporting the heat of the second optical element to the second heat dissipation member, and a cooling fan sending a cooling gas to the first and second heat dissipation members. The first heat dissipation member is on the opposite side from the direction toward which the light outputted from the first optical element travels. The second heat dissipation member is adjacent to the first heat dissipation member with a gap. The second heat dissipation member overlaps with the first heat when viewed along a flow direction of the cooling gas sent thereto.

A liquid crystal projector includes a liquid crystal panel configured to generate a modulated image, a sensor configured to detect a temperature of the liquid crystal panel, an optical shift element configured to shift an emission optical path of the modulated image generated by the liquid crystal panel, and a control circuit configured to control a velocity of a shift in the optical shift element according to the temperature detected by the sensor.

A novel spatial light modulator (SLM) includes a cover glass, and modulation layer, and a plurality of pixel minors, and separates unwanted, reflected light from desired, modulated light. In one embodiment, a geometrical relationship exists between the cover glass and the pixel minors, such that light that reflects from the cover glass is separated from light that reflects from the pixel minors and is transmitted from the SLM. In one example, one of the cover glass or the pixel minors is angled with respect to the modulation layer. In another example embodiment, the cover glass has a particular thickness, which introduces destructive interference between light that reflects from the top and bottom surfaces of the cover glass. In another embodiment antireflective coatings are disposed between optical interfaces of the SLM. In another embodiment, light from the SLM is directed through an optical filter to remove unwanted light.

An information processing apparatus acquires a first image of a first medium including a first region in which a character is written. The information processing apparatus projects the first image onto a predetermined position of a second medium. The information processing apparatus acquires a second image of the second medium including a second region in which a line of a different color from the character depicted in the projected first image is drawn. The information processing apparatus corrects color data of an overlapping region in which the first region and the second region overlap in the second image. The information processing apparatus projects the corrected second image onto the first medium so that the position of the character matches.

An electronic device comprises a projector that is configured to project an image and a control unit. The control unit is configured to control an orientation of the image to be projected to a first orientation when the electronic device is in a first attitude, and to control the orientation of the image to be projected to a second orientation different from the first orientation when the electronic device is in a second attitude different from the first attitude.

A novel spatial light modulator (SLM) includes a cover glass, and modulation layer, and a plurality of pixel mirrors, and separates unwanted, reflected light from desired, modulated light. In one embodiment, a geometrical relationship exists between the cover glass and the pixel mirrors, such that light that reflects from the cover glass is separated from light that reflects from the pixel mirrors and is transmitted from the SLM. In one example, one of the cover glass or the pixel mirrors is angled with respect to the modulation layer. In another example embodiment, the cover glass has a particular thickness, which introduces destructive interference between light that reflects from the top and bottom surfaces of the cover glass. In another embodiment antireflective coatings are disposed between optical interfaces of the SLM. In another embodiment, light from the SLM is directed through an optical filter to remove unwanted light.

A method for driving a projection system and a projection system including a phase modulator and at least one amplitude modulator. The phase modulator is configured to generate a highlight image incident on the amplitude modulator, the projector system further includes at least one image sensor configured to receive at least a portion of an illumination pattern substantially equivalent to the illumination pattern incident on the amplitude modulator, and the image sensor is being used to provide feedback to the controller of the projection system to improve the highlights projected by the projection system.