A projection device and a heat dissipation control method are provided. The projection device includes a closed accommodating space, and a heating element, a cooling element, and an active dehumidification unit that are located inside the closed accommodating space. The heat dissipation control method includes the following steps: obtaining specification temperature information by a specification temperature information obtaining unit, and determining a specification temperature of the cooling element according to the specification temperature information; sensing an ambient temperature and an ambient humidity inside the closed accommodating space by a temperature and humidity sensing unit, and calculating a dew point temperature according to the ambient temperature and the ambient humidity; obtaining a cold end temperature of a cold end surface by a temperature sensing unit; and determining, based on the dew point temperature, the specification temperature, and the cold end temperature, whether to turn on or off the active dehumidification unit.

A projector includes a base and a cover configured to be attached on the base. The base is equipped with a cooling fan, a light module and a cooling member. An air inlet and an air outlet are located on the two sides of the light module. The cooling member is aligned with the air outlet and close to the cooling fan. The cooling member guides the airflow to flow to the cooling fan. The air inlet, the air outlet, the cooling member, and the cooling fan define an air path, and the airflow is guided out of the projector under an action of the cooling fan.

An electro-optic device includes an interconnection board provided with an internal terminal, and a chip mounted on the interconnection board, and the chip is provided with a mirror, a drive element, and a chip-side terminal electrically connected to the drive element. The interconnection board includes a first surface on which an internal terminal is disposed, a second surface located on an opposite side to the first surface, a third surface connecting the first surface and the second surface to each other, and a fourth surface located on an opposite side to the third surface. The interconnection board is provided with a metal member exposed on the first surface and the second surface, and through holes (a first through hole and a second through hole) extending from the third surface to the fourth surface and having contact with the metal member.

A projection apparatus and a control method thereof are provided. The projection apparatus includes a light source, an optical engine, a first sensor, and a processor. The light source provides a light beam to the optical engine. The optical engine converts the light beam into an image beam and projects the same out of the projection apparatus. The first sensor senses an ambient temperature. The processor is coupled to the optical engine, the light source, and the first sensor, records a projection time of the optical engine, selects a selected temperature range in which the ambient temperature is included from multiple temperature ranges according to the ambient temperature, and selects a selected driving program from multiple driving programs corresponding to the temperature ranges according to the selected temperature range to control the light source. A brightness of light beam is negatively related to the projection time.

An illumination device of the disclosure includes a plurality of light sources and a correction unit. The plurality of light sources generate light having respectively different wavelengths. The correction unit corrects, on the basis of a change in relative luminosity, a light quantity of the light to be generated by at least one light source out of the plurality of light sources, to restrain a change in white balance. The change in the relative luminosity is caused by a change in wavelength associated with a change in temperature.

A wavelength estimation device including a light detector to receive light emitted from a light source and an estimation unit. The estimation unit estimates a wavelength of the light based on an amount of light received by the light detector.

The invention is a small, low-power consuming, projector system. Once programmed and provided with image data, it can be a standalone system for presenting varying length, silent, videos. Its programmability and FPGA-based micro-circuitry allows it to be repurposed with minimal effort to support other embedded-light-system applications.

An image display apparatus including a light source; a light source control unit configured to control electric power to be supplied to the light source; a light source cooling unit configured to cool the light source; a cooling control unit configured to control the light source cooling unit; an image display device; an illumination optical system configured to introduce light from the light source to the image display device, and a projecting optical system configured to project light modulated by the image display device. When the light source control unit receives a turn-off command, the light source control unit first lowers electric power to be supplied to the light source to a predetermined electric power lower than normal electric power to be supplied when the lamp is on, and then blocks the supply of the electric power to the light source, thereby turning the light source off.

An image projection apparatus includes a light source, an image generation unit configured to receive light from the light source and generate an image based on the received light, a projection optical system unit configured to project the image generated by the image generation unit, a heat dissipation unit configured to dissipate heat of the image generation unit, and a movable member configured such that a position of the movable member is movable relative to the projection optical system unit, wherein the image generation unit and the heat dissipation unit are mounted on the movable member.

The present application provides a projection device. The projection device of the present application includes a lens barrel and a thermal transfer assembly disposed on an outer wall of the lens barrel; the thermal transfer assembly includes a first thermal transfer structure and a second thermal transfer structure, the first thermal transfer structure is disposed on the outer wall of the lens barrel and extends along an axial direction of the lens barrel, one end of the second thermal transfer structure is disposed at one end of the first thermal transfer structure, and the other end of the second thermal transfer structure extends away from the axial direction of the lens barrel. The application can effectively dissipate thermal when the lens assembly is working.