Abstract: 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.

Abstract: An illumination system, a projection device, and a projection control method are provided. The illumination system includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a first dichroic element, a second dichroic element, and a control unit. The first light-emitting unit includes a first light-emitting element and a second light-emitting element. The control unit is electrically connected to the first light-emitting unit and configured to switch the illumination system between a high-performance mode and a high-chroma mode, wherein when the illumination system is in the high-performance mode, the control unit controls a current ratio of the second light-emitting element to be greater than a current ratio of the first light-emitting element, and when the illumination system is in the high-chroma mode, the control unit controls the current ratio of the second light-emitting element to be less than the current ratio of the first light-emitting element.

Abstract: A projection device, including an illumination system, a control element, a driving element, a light valve, and a projection lens, is provided. The illumination system includes multiple light sources for providing multiple light beams to be combined into an illumination light beam. The driving element respectively drives the light sources in a first mode or a second mode, so that the light beams have respective luminous brightness, and the driving element is switched from the first mode to the second mode according to a first signal. The control element provides the first signal to the driving element according to an optical state or a time state of the projection device. The light valve is adapted to convert the illumination light beam into an image light beam. The projection lens is adapted to project the image light beam out of the projection device.

Abstract: An illumination system provides an illumination beam and includes a red light source, a green light source, a blue light source, a first supplementary light source, a first X-shaped light-splitting assembly, a first light-splitting element, and a light-uniforming element. The red light source provides a red beam. The green light source provides a green beam. The blue light source provides a blue beam. The first supplementary light source provides a first supplementary beam. The first X-shaped light-splitting assembly guides the first supplementary beam and the blue beam to the first light-splitting element. The first light-splitting element guides the red beam, the green beam, the blue beam, and the first supplementary beam to the light-uniforming element. The first supplementary beam is a red supplementary beam or a blue supplementary beam, and the illumination system includes at least five light-emitting elements. A projection apparatus including the above illumination system is also provided.

Abstract: A projection lens module and a projector are provided. The projector includes an optical engine and a projection lens module. The optical engine includes a casing, a light source, a light valve, and a prism, where the light source, the light valve, and the prism are disposed in the casing. The light source emits an illumination beam to the light valve. The light valve modulates the illumination beam to generate an image beam and projects the image beam to the projection lens module. The prism is disposed on an optical path of the image beam. The projection lens module is connected to the casing of the optical engine and is configured to project the image beam. The projection lens module includes a projection lens and a smooth picture actuator, where the smooth picture actuator is fixed to the projection lens and is located outside the optical engine.

Abstract: A projection device including a light combining system, an illumination system, and a projection lens is provided. The light combining system is configured to provide a combined beam. The illumination system is disposed on a transmission path of the combined beam and configured to receive the combined beam to generate an illumination beam. At least one light valve is disposed on a transmission path of the illumination beam and converts the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam and configured to project the image beam out of the projection device. The light combining system is located in a first layer space. The at least one light valve is located in a second layer space. The first layer space is different from the second layer space. The first layer and second layer spaces overlap in the gravitational direction.

Abstract: A projection lens module and a projector are provided. The projector includes an optical engine and a projection lens module. The optical engine includes a casing, a light source, a light valve, and a prism, where the light source, the light valve, and the prism are disposed in the casing. The light source emits an illumination beam to the light valve. The light valve modulates the illumination beam to generate an image beam and projects the image beam to the projection lens module. The prism is disposed on an optical path of the image beam. The projection lens module is connected to the casing of the optical engine and is configured to project the image beam. The projection lens module includes a projection lens and a smooth picture actuator, where the smooth picture actuator is fixed to the projection lens and is located outside the optical engine.

Abstract: A projector includes a light source module and an optical engine. The light source module provides an illumination beam. The optical engine includes a light valve, a projection lens, and a pixel offset device. The light valve has an active surface, and the active surface converts the illumination beam into an image beam and reflects the image beam. The projection lens projects the image beam from the projector. The pixel offset device is located between the light valve and the projection lens and includes a frame and a transparent panel, the transparent panel is disposed in the frame and includes a transparent surface, the transparent panel is disposed on the transmission path of the illumination beam and the transmission path of the image beam, the frame is configured to drive the transparent panel to vibrate, and the transparent surface is tilted with respect to the active surface.

Abstract: A projector includes a light source module and an optical engine. The light source module provides an illumination beam. The optical engine includes a light valve, a projection lens, and a pixel offset device. The light valve has an active surface, and the active surface converts the illumination beam into an image beam and reflects the image beam. The projection lens projects the image beam from the projector. The pixel offset device is located between the light valve and the projection lens and includes a frame and a transparent panel, the transparent panel is disposed in the frame and includes a transparent surface, the transparent panel is disposed on the transmission path of the illumination beam and the transmission path of the image beam, the frame is configured to drive the transparent panel to vibrate, and the transparent surface is tilted with respect to the active surface.

Abstract: A projection apparatus including an illumination system, a light valve, an optical actuation element and a projection lens is provided. The illumination system provides an illumination beam. An image display surface of the light valve includes a first region and a second region. First pixels of the first region convert the illumination beam into first sub-image beams. Second pixels of the second region convert the illumination beam into second sub-image beams. A transmission path of one of the first sub-image beams in the optical actuation element is a first transmission path. A transmission path of one of the second sub-image beams in the optical actuation element is a second transmission path. A length of the first transmission path is smaller than a length of the second transmission path. In this way, the projection apparatus has good image quality.

Abstract: A projection apparatus including an illumination system, a light valve, an optical actuation element and a projection lens is provided. The illumination system provides an illumination beam. An image display surface of the light valve includes a first region and a second region. First pixels of the first region convert the illumination beam into first sub-image beams. Second pixels of the second region convert the illumination beam into second sub-image beams. A transmission path of one of the first sub-image beams in the optical actuation element is a first transmission path. A transmission path of one of the second sub-image beams in the optical actuation element is a second transmission path. A length of the first transmission path is smaller than a length of the second transmission path. In this way, the projection apparatus has good image quality.