The invention relates to a light beam generating device and method, and a projection device. The light beam generating device is configured to receive a color control signal and generate a target light beam having a target color, and includes a plurality of drivers, a current signal generating circuit, and a control circuit. The drivers respectively drive a plurality of light-emitting elements according to a plurality of current signals, wherein the plurality of light-emitting elements collectively generate the target light beam. The current signal generating circuit is coupled to the drivers and generates the plurality of current signals according to the color control signal corresponding to the target color. The control circuit is coupled to the drivers and controls whether each driver is enabled according to the color control signal.

A projection device includes a projection lens, a first laser light source, a second laser light source and a polarization direction. The first laser light source and the second laser light source respectively emit a first laser light to the projection lens through a laser optical path, wherein the first laser light has a first polarization direction. The polarization direction conversion layer is disposed on the laser optical path and configured to convert the first laser light of the first laser light source into a second laser light, wherein the second laser light has a second polarization direction different from the first polarization direction.

A display device and a display control method are provided, the display device including: a reflective screen; and a display assembly comprising: a light source, configured to emit light beams; a light modulator provided in a direction of propagation of the light beams and a reflective display located downstream the light modulator in an optical path of the display device, the light modulator is configured to modulate the light beams alternately at two different deflection angles respectively such that the light beams travel through the light modulator and then are incident alternately on the reflective display in a first direction and a second direction, and the reflective display is configured to generate a first image in response to the light beam being incident on the reflective display in the first direction and to generate a second image in response to the light beam being incident on the reflective display in the second direction; and a relay optical device, which is located downstream the reflective display in the optical path of the display device and configured to project the light beam carried with the first image and the beam carried with the second image onto two positions on the reflective screen different from each other respectively in such way that virtual images of the first image and the second image are generated respectively at different distances from the reflective screen, at a side of reflective screen opposite to a side from which the virtual images are observed.

An example projector includes: a first light source to provide first light; and a second light source to provide second light. A spatial light modulator produces: first modulated light by modulating the first light; and second modulated light by modulating the second light. An image direction device directs: the first modulated light to project a first image having a first pixel position; and the second modulated light to project a second image having a second pixel position.

Aspects of the present invention relate to methods and systems for the see-through computer display systems with adjustable-zoom cameras positioned such that their respective capture fields-of-view at least partially overlap at a target distance.

A display device includes a plurality of display elements, a first light source that emits first illumination light, a second light source that emits second illumination light, a signal synthesizing unit configured to generate a mixed image signal based on an input signal, a pixel control unit configured to, based on the mixed image signal, control a voltage applied to the display elements, and a light source control unit configured to control the first and second light sources. During period in which the second illumination light is emitted, the pixel control unit is configured to control a voltage applied to some display elements of the plurality of display elements according to signal value of the input signal and at same time, regardless of signal value of the input signal, set a voltage applied to some other display elements of the plurality of display elements to a constant value.

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.

A light source unit includes a first light source for first light, a second light source for second light differing from the first light, a display device for performing a gradation control on the first light and the second light which are emitted in a time dividing fashion in corresponding gradation control periods to thereby form image light, and a processor configured to control a first dimming mode for adjusting a quantity of light of the first light source in the gradation control periods of the first light and the second light and a second dimming mode for adjusting the quantity of light of the first light source by performing a turn-off control in at least a partial period of the gradation control period of the first light and adjusting the quantity of light of the first light source in the gradation control period of the second light.

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 light path adjustment mechanism includes a support, a carrier, an optical plate member, a permanent magnet and an electromagnet. The carrier is disposed in the support and connected to the support by a first elastic member and a second elastic member, the first elastic member and the second elastic member are configured to twist substantially about a first axial direction, and the optical plate member is disposed on the carrier. An attractive force or a repulsive force generated between the permanent magnet and the electromagnet acts in a direction substantially perpendicular to the first axial direction, and one end of the carrier is provided with the permanent magnet or the electromagnet.