In described examples, a first TIR or RTIR element is arranged to introduce at least red light to a first spatial light modulator for modulation thereof, and a second TIR or RTIR element is arranged to introduce at least green light to a second spatial light modulator for modulation thereof. At least one of the first and second TIR or RTIR elements is arranged to introduce blue light to at least one of the first and second spatial light modulators, respectively, for modulation thereof: time-sequentially apart from the first spatial light modulator's modulation of the introduced red light, to an extent the blue light is so introduced to the first spatial light modulator; and time-sequentially apart from the second spatial light modulator's modulation of the introduced green light, to an extent the blue light is so introduced to the second spatial light modulator.

A filter element and a projection device are provided. The filter element is configured on the transmission path of at least one light beam, and includes a substrate and a film. The film is located on a surface of the substrate, and includes a first area and a second area. The first area includes a center, corresponding to the central axis of the at least one light beam. The distance between the second area and the center of the first area is greater than the distance between any point in the first area and the center. The average thickness of the second area of the film is greater than the average thickness of the first area of the film. The filter element of the disclosure may still have a similar filter effect when the incident angle is relatively large.

A display apparatus comprises a light source device, an image data processing module, a light modulating device and an image synthesizing device. The light source device is configured to emit first light and second light. The image data processing module is configured to receive original image data of an image to be displayed, wherein the original image data of the image to be displayed is based on image data within a second color gamut range and comprises original control signal values of m colors of each pixel; the second color gamut range covers a first color gamut range and has a portion that exceeds the first color gamut range. The image data processing module is further configured to map the original control signal values of the m colors into m corrected control signal values corresponding to the first light and n corrected control signal values corresponding to the second light.

A liquid crystal projector includes a liquid crystal panel configured to generate a modulated image, a sensor configured to detect a temperature of the liquid crystal panel, an optical shift element configured to shift an emission optical path of the modulated image generated by the liquid crystal panel, and a control circuit configured to control a velocity of a shift in the optical shift element according to the temperature detected by the sensor.

A laser-excited phosphor source of white light modulated and mixed to form homogenized light having a sequence of different colors. Blue excitation laser light is reflected by a wavelength-selective reflector offset from a central optical axis of yellow wavelength-converted light emitted from a phosphor onto which excitation laser light is focused. Having the wavelength-selective reflector offset from the optical axis allows most of the yellow light to bypass the reflector. The yellow light and some of the laser light is collimated and focused through a color wheel into a light tunnel. That light is then focused through a prism pair having an internal interface of a first prism having total-internal-reflection in a first direction towards an imaging device and transmission of light from the imaging device in a second direction. Output light in the second direction is projected as the output beam by projection optics.

A projection system, comprising a first light source which is an array light source, the first light source being divided into a plurality of illumination areas, and each illumination area may be independently controllable so as to generate a first illumination light field of which the brightness and darkness may be modulated; a second light source comprises an illumination unit and a light steering unit; the light steering unit redistributes illumination light emitted from the illumination unit to generate a second illumination light field of which the brightness and darkness may be modulated, wherein the first and second illumination light fields overlap to generate a combined light field. Also provided is a projection display method. The goal of simultaneously increasing image peak value brightness and lowering image dark field brightness is achieved, and a projection system that has a high contrast ratio is thus obtained.

A wavelength conversion device includes a driver, a substrate and a support. The support is disposed between the driver and the substrate. The support is connected to the substrate and the driver. The driver drives the support and the substrate to rotate about a central axis. The support includes at least one through hole. The invention also provides a projection device including a light source system, the aforementioned wavelength conversion device, a light valve, and a projection lens.

The disclosure provides an illumination system and a projection device applying the illumination system. The illumination system includes a laser light source, a wavelength conversion module, and a spot region modulation module configured to shift a transmission path of a laser beam. When the wavelength conversion module rotates, the spot region modulation module moves, in a first period of time, the laser beam in a wavelength conversion region of the wavelength conversion module along a first shift path, so that the laser beam forms a first spot region in an irradiation region in the wavelength conversion region. The spot region modulation module causes, in a second period of time, the laser beam to form a second spot region in an irradiation region in a non-conversion region of the wavelength conversion module. A size of the first spot region is greater than a size of the second spot region.

A projection device and a controlling method of the projection device are provided. The projection device includes a light emitting module, a driver, a light valve, a projection lens and a processor. The light emitting module generates a light beam according to a driving current respectively. The driver generates the driving current and transmit the driving current to the light emitting module according to an operating signal. The light valve receives the light beam to form an image light beam. The projection lens projects the image light beam. The processor provides the operating signal with a default period to the driver and provides an operation of the light valve. According to the operating signal or the operation of the light valve, the driver generates the driving current lower than a default current during a first time interval in the default period.

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.