The invention describes a method for operating a discharge lamp by adapting a current signal. A distribution function is defined for gathering several time span values that define several different time spans. The several time span values are determined depending on the distribution function by one or more random numbers. The current signal is commutated at every instant of time according to an expiry of each of the several time spans. A light apparatus is provided with a control unit to perform any method.

A projector includes a first light source that emits a first light beam from a first light-emitting region including first light-emitting elements, and a second light source that emits a second light beam from a second light-emitting region including second light-emitting elements emitting light. Projector includes optical system that aligns traveling directions of first and second light beams, optical modulation device that adjusts first and second light beams based on image information, projection optical device, and control unit. The control unit changes a light-emitting position of the first light beam in the first light-emitting region to move an illumination region on an image forming region of the optical modulation device, and changes a light-emitting position of the second light beam in the second light-emitting region to move a second illumination region on the image forming region of the optical modulation device in the same direction as the first illumination region.

In described examples, a system (e.g., a projection system) can include a diffractive optical element adapted to be illuminated by at least one coherent light beam. A lens array is coupled to receive a diffracted beam of light from the diffractive optical element. The lens array includes a first and a second array lens. The first array lens is coupled to receive a first sector of a pattern of illumination of the diffracted beam of light, and the second array lens is coupled to receive a second sector of the pattern of illumination of the diffracted beam of light. A spatial light modulator is coupled to receive overlapping diffracted beams of light from the first and second array lenses to form an image beam.

An illumination system for providing an illumination light beam is provided, which includes a light-source module, a scattering element and a light uniforming element. The light-source module emits an illumination light beam. The scattering element is between the light-source module and the light uniforming element, and has multiple scattering areas with different haze values. A haze value of a first scattering area that is close to a center of the scattering element is greater than a haze value of a second scattering area that is remote from the center. A projection device is also provided. A scattering element of the invention has multiple scattering areas with different haze values, and a haze value of one that is close to a center of the scattering element is greater than a haze value of the other that is remote from the center, thereby increasing light energy utilization.

A projection system can include a first modulator including a plurality of pixels in a first modulator surface, a second modulator including a plurality of pixels in a second modulator surface, and an intermediate imaging optical unit, which images the first modulator surface onto the second modulator surface, wherein the intermediate imaging optical unit includes a first lens having a convex side and wherein the convex side of the first lens is a free-form surface, which is not spherical and not rotationally symmetric and does not exhibit any mirror symmetry.

A system and method for dynamically adjusting a color gamut of a display system, and a display system are provided. The display system includes a light source system and an imaging system. The light source system includes an excitation light source and a narrow-spectrum primary-light source. The imaging system includes a spatial light modulation device and the system for dynamically adjusting the color gamut. The excitation light source emits excitation light which is processed to output at least one broad-spectrum primary light. The narrow-spectrum primary light source outputs narrow-spectrum primary light. The narrow-spectrum primary light and the broad-spectrum primary light are combined and then output to the imaging system. The brightness of light emitted by the excitation light source and the narrow-spectrum primary light source is adjusted.

A light source device includes a first laser source and a diffusion element that diffuses light, the diffusion element being provided on an optical path of a first laser beam emitted by the first laser source. The diffusion element comprises, on an incident surface, a first lens array in which a plurality of first lens elements are arranged that divide the first laser beam into a plurality of light beams and further comprises, on an exit surface, a second lens array in which a plurality of second lens elements are arranged that each face a respective first lens element of the plurality of first lens elements and that each emit a light beam incident through the facing first lens element toward an imaging surface. Each second lens element forms a light source image in a different region on the imaging surface.

A light source system and a projection system, comprising a light source; a switching system switching light emitted by the light source into at least two light beams having a preset proportion in the manner of time division or light intensity division; a color wheel assembly located in a transmission light path of each light beam of the at least two light beams, with the color wheel assembly generating light having different colors and a preset proportion under the irradiation of each light beam of the at least two light beams, and light of different colors being able to synthesize a projection image after being modulated by a light modulation system, wherein the switching system can adjust the proportion of the at least two light beams according to the parameters of the projection image, so as to adjust the proportion of the light of different colors.

A projection-type display which projects and displays images in accordance with an image signal includes a light source for projecting the images, output means that is equipped with a coil and switch, that uses electromagnetic induction of the coil to supply a current, and that changes the magnitude of the current by means of the switch, a cooling fan that cools the projection-type display device and for which the rotational speed is variable; and control means that, upon receiving an instruction to set a first mode in which a first current is intermittently supplied to the light source.

The light source control apparatus controls drive of multiple light sources included in a light source unit to be used in a state where the multiple light sources are lit. The multiple light sources each include multiple light-emitting elements. The light source control apparatus includes an acquirer acquiring temporal information relating to a temporal change of each of the light sources, an estimator acquiring an estimated lifetime of each of the multiple light sources by using the temporal information, and a controller decreasing, when the multiple light sources include a first light source whose estimated lifetime is shorter than a target lifetime set for the light source unit, a light emission amount of the first light source.