A projector includes an optical apparatus, a control circuit board disposed above an upper side of the optical apparatus, a cooling fan disposed near a rear surface outside air inlet port in a case which lies opposite to a projection direction and having an upper surface outside air inlet port configured to let in outside air from an upper surface and a lower surface outside air inlet port configured to let in outside air from a lower surface of the case, and a heat sink provided corresponding to a discharge port of the cooling fan and connected with the optical apparatus, and a flow path resistance on a side facing the lower surface outside air inlet port is smaller than a flow path resistance on a side facing the upper surface outside air inlet port.

Provided are a wavelength conversion apparatus, a light source system including the same, and a display device including the light source system. The wavelength conversion apparatus includes an angle deflection region and a wavelength conversion region for converting incident second light into excited light and then emitting same. The angle deflection region includes deflection units, each of which includes a light emergent face for emitting first light. A first included angle is formed between the light emergent face and a reference plane. First included angles between light emergent faces of at least two deflection units and the reference plane are not equal. The deflection units are located on a light path of the first light in a time sequence, so as to change an emergent angle of the first light in the time sequence, such that the first light is successively scanned at a preset position to form virtual pixels.

An illumination system and a projection device are provided. The illumination system includes multiple laser light source units, a light splitting element, a wavelength conversion module, and a filter module. The laser light source units include first and second laser light source units, respectively configured to provide first and second beams. The light splitting element is located on transmission paths of the first and second beams. When the wavelength conversion module rotates synchronously with the filter module, in a first period of time, the first beam is transmitted to the filter module via the light splitting element and then reflected to a wavelength conversion region via a first color filter region of the filter module, and the second beam is transmitted to the wavelength conversion region via the light splitting element. The first and second beams are converted to a converted beam, which is transmitted to the filter module.

An optical system of the present disclosure includes: a first optical system that includes a first optical element having a plurality of divided regions having mutually different polarization actions, the first optical element being disposed at a first pupil position in the optical system, and that generates illumination light including a plurality of color light beams in mutually different wavelength bands; a plurality of light valves that each modulates at least one color light beam of the plurality of color light beams included in the illumination light; and a second optical system that includes a second optical element having a plurality of divided regions having mutually different polarization actions, the second optical element being disposed at a second pupil position conjugate to the first pupil position, and on which the plurality of color light beams modulated by the plurality of light valves is incident.

A light source device includes a light source, a plurality of wavelength conversion units, and a plurality of optical systems. The plurality of wavelength conversion units each includes a wavelength conversion region configured to receive light emitted from the light source and emit light with a wavelength different from a wavelength of the received light. The plurality of optical systems are configured to form images of wavelength conversion regions of the plurality of wavelength conversion units. The light source is configured to irradiate the wavelength conversion units with light at a same timing. The plurality of optical systems are configured to cause the images of the wavelength conversion regions of the plurality of wavelength conversion units to be adjacent to or superimposed on each other.

An image display device includes: a first display panel and a second display panel in which transmittance or reflectance of light is controlled on the basis of an image signal; and a light irradiation unit that irradiates the first display panel and the second display panel with light, wherein the first display panel and the second display panel are sequentially driven by image signals corresponding to a plurality of color light beams, and in a period in which one of the first display panel and the second display panel is driven by an image signal corresponding to any one of the plurality of color light beams, an image signal for driving the other display panel is switched.

A lighting apparatus includes: a light source generating a first color component light; a separation element partially transmitting the first color component light, partially reflecting the first color component light, and transmitting a second color component light different from the first color component light at a certain moment; an illuminant excited by the first color component light transmitted through the separation element to generate the second color component light; and an optical system combining the first color component light made incident on the separation element from the light source and reflected by the separation element with the second color component light made incident on the separation element from the illuminant and transmitted through the separation element. The separation element is configured to have variable transmittance and reflectance with respect to the first color component light.

Systems and methods for a multi-primary color system for display. A multi-primary color system increases the number of primary colors available in a color system and color system equipment. Increasing the number of primary colors reduces metameric errors from viewer to viewer. The multi-primary color system includes Red, Green, Blue, Cyan, Yellow, and Magenta primaries. The systems of the present invention maintain compatibility with existing color systems and equipment and provide systems for backwards compatibility with older color systems.

A projection apparatus includes an illumination system including a first laser light source and a second laser light source, a first light valve, and a second light valve. The first laser light source provides a first laser beam in first time periods. The second laser light source provides a second laser beam in second time periods. A color refresh rate of the projection apparatus is the number of times of alternating the first and second time periods with each other, and the color refresh rate ranges between 60 Hz and 6000 Hz. The first and second laser beams respectively form a first color light and a second color light when exiting the illumination system. The first and second light valves are located on a transmission path of the first color light. One of the first and second light valves is located on a transmission path of the second color light.

A laser projection apparatus includes a laser source, an optical engine, a projection lens, and a circuit system architecture. The circuit system architecture is configured to control the laser source to emit laser beams of three primary colors. The circuit system structure includes: a display control circuit, a first laser chip driving circuit, a second laser chip driving circuit, and a third laser chip driving circuit. The display control circuit is configured to generate three PWM signals and three enable signals. The laser chip driving circuit is electrically connected to the display control circuit, and is configured to receive a PWM signal of a corresponding color and an enable signal of the corresponding color, so as to drive a laser chip of the corresponding color to emit laser beams of the corresponding color.