An information acquisition method implemented by one or more processor, includes: acquiring, for each of frames, a brightness value corresponding to a position of a color filter from a light receiving device including light receiving elements whose light receiving surfaces are covered with color filters, the color filters including the color filter and the color filters comprising at least first color filters transmitting light of a wavelength band corresponding to a first color and second color filters transmitting light of a wavelength band corresponding to a second color; and acquiring information on a mobile device based on difference between brightness values of the position acquired from a plurality of frames and at least one of a threshold for the first color filters and a threshold for the second color filters.

The present disclosure provides a display system that may comprise a retro-reflective screen configured to reflect incident light along a direction that is opposite to the direction of propagation of the incident light, and a projector that may project light characterizing an image or video to the retro-reflective screen. An array of optical elements or an individual optical element may be positioned between the retro-reflective screen and the projector. The array of optical elements or individual optical element may direct the light from the projector to the retro-reflective screen in a manner such that the image or video is viewable by a user at an observation angle of at least about 2 degrees.

An electro-optical device includes a substrate, an electro-optical layer, an insulating layer, a conductive film is disposed between the insulating layer and the electro-optical layer, and that is in contact with the insulating layer, and a conductive portion provided at the insulating layer and coupled to the conductive film, wherein the conductive portion overlaps the conductive film in plan view, a surface of the conductive portion that is in contact with the conductive film is positioned at a first position in a thickness direction of the insulating layer, and a surface of the insulating film that is in contact with the conductive film is positioned at a second position different from the first position in the thickness direction of the insulating layer.

A projector includes a measurement unit, a correction parameter generation unit, and an image processing unit. The measurement unit measures a color of an image formed on a projection surface in terms of a plurality of colors constituting an RGB color system and at least one color constituting an XYZ color system. The correction parameter generation unit generates a correction parameter based on a conversion value and a second measurement value of the color, which is measured by the measurement unit among the colors constituting the XYZ color system. The conversion value is obtained by converting a first measurement value of the color in the RGB color system, which is measured by the measurement unit, into the color in the XYZ color system. The image processing unit corrects image light with the correction parameter.

A projector includes a measurement unit and a correction parameter generation unit. The measurement unit measures a color of image light of the image formed on a projection surface in terms of a plurality of colors constituting an RGB color system and a Z value in an XYZ color system. The correction parameter generation unit generates a correction parameter based on a first measurement value and a second measurement value. The first measurement value measured by the measurement unit is obtained by converting a measurement value of the color in the RGB color system into the color in the XYZ color system. The second measurement value measured by the measurement unit is a value in the XYZ color system. The measurement unit includes an optical filter having transmittance characteristics corresponding to spectral characteristics of blue light, in a wavelength range of a color light in the RGB color system.

In an imaging apparatus, two pupils of a pupil division optical system transmits light of a first wavelength band and light of a second wavelength band. An amount of components of the first wavelength band in first transmittance characteristics and second transmittance characteristics is more than an amount of components of the second wavelength band in the first transmittance characteristics and the second transmittance characteristics. An amount of components of the second wavelength band in third transmittance characteristics is more than an amount of components of the first wavelength band in the third transmittance characteristics. A processor is configured to generate a color image including a first signal that is based on the first transmittance characteristics as a first channel and a second signal that is based on the second transmittance characteristics as a second channel and a third channel.

A wavelength-converting wheel has a light incident side. The wavelength-converting wheel includes a motor, a turntable, a wavelength-converting layer and a reflective element. The motor has a rotating shaft. The turntable has an inner ring portion and an annular irradiation portion. The inner ring portion is sleeved on the rotating shaft, the annular irradiation portion is connected to an outer edge of the inner ring portion, and the annular irradiation portion includes a light-reflecting region and a wavelength-converting region. The wavelength-converting layer is disposed in the wavelength-converting region and has a light receiving surface facing the light incident side. The reflective element is disposed in the light-reflecting region and has a reflective surface facing the light incident side. The light receiving surface is coplanar with the reflective surface or the light receiving surface is farther from the light incident side with respect to the reflective surface.

A light source device includes a light source emitting first light in a first wavelength band, a light guide section guiding partial light of the first light, a wavelength conversion section including a phosphor, which other partial light of the first light, and which converts the other partial light into second light in a second wavelength band. A light guide section first side surface and a wavelength conversion section second side surface are opposed. The first side surface has a diffraction grating. The partial light enters the light guide section from the first side surface via the diffraction grating. The other partial light enters the wavelength conversion section from the second side surface. The partial and second lights are emitted in one of a normal direction of the first end surface of the light guide section and a normal direction of the third end surface of the wavelength conversion section.

An apparatus and method for controlling the spectrum of stimulated Raman scattering that is used for despeckling of digitally projected images. The stimulated Raman scattering is utilized to add wavelength diversity for reduced speckle and to change the color of the light to a more desirable combination of wavelengths. Digital projection with color-sequential projectors may be enabled by alternately switching the Raman spectrum between green and red. Improved projector transmission may be achieved by minimizing the amount of yellow light generated in the Raman spectrum.

An apparatus and method for controlling the spectrum of stimulated Raman scattering that is used for despeckling of digitally projected images. The stimulated Raman scattering is utilized to add wavelength diversity for reduced speckle and to change the color of the light to a more desirable combination of wavelengths. Digital projection with color-sequential projectors may be enabled by alternately switching the Raman spectrum between green and red. Improved projector transmission may be achieved by minimizing the amount of yellow light generated in the Raman spectrum.