According to the invention, a light guide plate-type video display device and a video display system that are capable of displaying a video with less color deviation and less video distortion are provided. A video display device 101 configured to display a video includes a video projection unit 200 configured to project video light, a video deflection unit 210, and a light guide portion 230. The video deflection unit 210 deflects video light emitted by the video projection unit 200 and causes the video light to propagate to the light guide portion 230, and the light guide portion 230 causes the entered video light to propagate therein and outputs the video light. Here, the video deflection unit 210 or the light guide portion 230 is configured to reduce color dispersion of the video light outputted from the light guide portion 230.

A projection system according to an embodiment of the present technology includes an image formation apparatus, a projection lens, a measurement apparatus, a control apparatus, and a measurement assisting apparatus. The image formation apparatus forms image light. The projection lens projects the image light. The measurement apparatus measures the image light. The control apparatus controls the image formation apparatus on the basis of output of the measurement apparatus. The measurement assisting apparatus is disposed between the image formation apparatus and the projection lens and is configured to be capable of selectively switching between a first state to cause the image light to enter the projection lens and a second state to cause the image light to enter the measurement apparatus.

A light transmitting device that includes a light transmitter that transmits a spatial light signal including a communication signal, and a light transmission control unit that adds a dummy signal having a same brightness as a ghost image of the communication signal to the spatial light signal and controls the light transmitter in such a way that the dummy signal is displayed at a position of the ghost image.

A light source apparatus (1) according to the present disclosure includes a wavelength conversion device (10) that includes two or more wavelength conversion units (11-13) serially coupled in a first direction. The wavelength conversion device (10) has a configuration in which the two or more wavelength conversion units (11-13) generate respective converted lights having wavelengths different from each other to generate two or more converted lights. The two or more wavelength conversion units (11-13) each include a first end surface and a second end surface that are formed in a direction parallel to the first direction, and a light entering surface (43) that is formed in a second direction different from the first direction and which an excitation light for generating the converted light enters. The first end surface (41) of one wavelength conversion unit (13) positioned at one end of the wavelength conversion device (10) of the two or more wavelength conversion units (11-13) is configured to be a light extraction surface from which the two or more converted lights are extracted out of the excitation light and the two or more converted lights.

A projection system and its color calibration method are provided. The projection system includes a projection device, a camera device, and a processing circuit. The projection device projects a calibration projection image including a plurality of calibration regions. The camera device captures the calibration projection image. The processing circuit performs a color calibration operation to calibrate color uniformity of the calibration projection image. The processing circuit drives the projection device to project the calibration projection image according to color gain values of the calibration regions. The processing circuit drives the camera device to capture the calibration projection image, calculates color values of the calibration regions, and updates the color gain values of the calibration regions to make the color values of the calibration regions approach at least one target value. The system and the method may automatically and adaptively calibrate the color uniformity of the calibration projection image.

An attraction system includes a sensor configured to determine a measured color property of a portion of an image projected by a projector onto a projection surface of the attraction system and a control system communicatively coupled to the sensor. The control system is configured to receive, from the sensor, data indicative of the measured color property and operate the attraction system based on a comparison between the measured color property and a target color property associated with the sensor.

A projector and a brightness adjusting method are provided. The projector includes a distance sensor configured to detect a distance between the projector and a projection plane, a light source configured to provide an illumination beam, a brightness controlling circuit configured to control the light source, and a processor coupled to the distance sensor, the light source, and the brightness controlling circuit. The processor calculates according to the distance to obtain an image size of a projected image on the projection plane. The processor obtains a current value corresponding to the image size according to a color table. The processor instructs the light source to adjust a luminous flux of the illumination beam according to the current value for generating a target brightness value of the projected image. When a brightness of the projected image is excessively large, a brightness of an image beam of the projector is automatically reduced.

A control apparatus includes an acquiring unit configured to acquire a plurality of identification data indicating display performances regarding image qualities of a plurality of display apparatuses, and a generating unit configured to generate a first identification datum indicating a display performance with which all the display apparatuses are compatible using the plurality of identification data.

An image display system includes: a display device; an image supply device coupled to the display device in such a way as to be able to bidirectionally communicate and supplying an image signal; and an operation terminal having a plurality of operation buttons. The operation terminal transmits an operation signal in response to an operation on the operation button. The display device displays a first image supplied from the image supply device and a second image generated by the display device. On receiving the operation signal, the display device decides a degree of priority of the first image and the second image. The display device transmits a signal to stop updating the first image to the image supply device and executes processing based on the second image when the degree of priority of the second image is higher than the degree of priority of the first image.

A projector system includes a connector attachable to a lighting wiring base mounted on a ceiling surface of a room, a housing hanging from the connector, a communicator accommodated in the housing to obtain content to be projected onto a wall surface of the room, a projection unit accommodated in the housing to emit emission light to project a picture including the content onto the wall surface, a brightness sensor to sense a brightness of the room, and a corrector to control the emission light to correct an effect of a state of the wall surface on the projected picture in accordance with the brightness of the room.