Abstract: A projection device, a projection system and a method for calibrating projected image are provided. The projection device and an external projection device the same image source and respectively project an image and another image corresponding to the image source. The same portion of the image source where the two images overlap each other forms an overlapping area. The projection device includes a lens, a light shielding member and a processor. The light shielding member is disposed on the lens. The processor controls the light shielding member to selectively shade a partial area of the lens according to the brightness of the image source, wherein the partial area corresponds to the overlapping area.

Abstract: A method for controlling projectors includes identifying a first projector and a second projector by using a database, acquiring a first control code of the first projector and a second control code of the second projector after the first projector and the second projector are identified, and generating at least one control signal to the first projector and the second projector for controlling operational actions of the first projector and the second projector according to the first control code and the second control code.

Abstract: A projection device, a projection system and a method for calibrating projected image are provided. The projection device and an external projection device the same image source and respectively project an image and another image corresponding to the image source. The same portion of the image source where the two images overlap each other forms an overlapping area. The projection device includes a lens, a light shielding member and a processor. The light shielding member is disposed on the lens. The processor controls the light shielding member to selectively shade a partial area of the lens according to the brightness of the image source, wherein the partial area corresponds to the overlapping area.

Abstract: A projector recommendation method includes steps of providing a look-up table, wherein the look-up table records a plurality of projectors and a plurality of projection parameters corresponding to each of the projectors; inputting a size of a projection plane, a projection distance and an environmental brightness; calculating a projection length according to the size of the projection plane, a target aspect ratio and a blending manner, calculating a target throw ratio according to the projection distance and the projection length, and calculating a target minimum projection brightness according to the environmental brightness, a predetermined brightness level and a projection area; and generating a projector recommendation result according to the target minimum projection brightness, the target throw ratio, a target resolution corresponding to the target aspect ratio and the projection parameters.

Abstract: A projector includes a lens, a first base, a lock member, a second base and a first fixing member. The lens includes at least one adjusting member. The first base is disposed with respect to the lens. The lock member is disposed on the at least one adjusting member. The second base is disposed with respect to the lock member. When the first fixing member fixes the second base to the first base, the second base pushes the lock member, such that the lock member forces the at least one adjusting member on the lens tightly.

Abstract: A projector including an optical machine, a lens and a casing is provided. The optical machine is configured to form an optical image. The lens is located on a projection path of the optical machine so that the optical image is projected on the lens. The casing is configured to receive the optical machine and the lens. The casing is provided with a positioning mark, which is aligned with an imaging center of the optical image in a vertical direction and configured to align the imaging center of the optical image with a center of a projection screen.

Abstract: A projection device includes a laser light source and a wavelength conversion assembly. The laser light source is configured to emit a first laser light having a first wavelength. The wavelength conversion assembly is configured to convert a first portion of the first laser light into a second laser light, wherein the second laser light has a second wavelength different from the first wavelength. The second laser light is reflected back to an upstream optical path of the wavelength conversion assembly through the wavelength conversion assembly, and a second portion of the first laser light is reflected to a downstream optical path of the wavelength conversion assembly through the wavelength conversion assembly.

Abstract: A projector includes a lens, a first base, a lock member, a second base and a first fixing member. The lens includes at least one adjusting member. The first base is disposed with respect to the lens. The lock member is disposed on the at least one adjusting member. The second base is disposed with respect to the lock member. When the first fixing member fixes the second base to the first base, the second base pushes the lock member, such that the lock member forces the at least one adjusting member on the lens tightly.

Abstract: A projection system includes a plurality of projection units, a sensing module and a processing unit. The projection units project a plurality of images. The sensing module senses a current optical parameter of each of the images to obtain a plurality of current optical parameters. The processing unit communicates with the projection units and the sensing module. The processing unit receives the current optical parameters from the sensing module, determines a target optical parameter according to the current optical parameters, and transmits a control signal to each of the projection units. Each of the projection units adjusts the current optical parameter to the target optical parameter in response to the control signal.

Abstract: A projection device includes a laser light source and a wavelength conversion assembly. The laser light source is configured to emit a first laser light having a first wavelength. The wavelength conversion assembly is configured to convert a first portion of the first laser light into a second laser light, wherein the second laser light has a second wavelength different from the first wavelength. The second laser light is reflected back to an upstream optical path of the wavelength conversion assembly through the wavelength conversion assembly, and a second portion of the first laser light is reflected to a downstream optical path of the wavelength conversion assembly through the wavelength conversion assembly.

Abstract: A projector recommendation method includes steps of providing a look-up table, wherein the look-up table records a plurality of projectors and a plurality of projection parameters corresponding to each of the projectors; inputting a size of a projection plane, a projection distance and an environmental brightness; calculating a projection length according to the size of the projection plane, a target aspect ratio and a blending manner, calculating a target throw ratio according to the projection distance and the projection length, and calculating a target minimum projection brightness according to the environmental brightness, a predetermined brightness level and a projection area; and generating a projector recommendation result according to the target minimum projection brightness, the target throw ratio, a target resolution corresponding to the target aspect ratio and the projection parameters.

Abstract: A projector including an optical machine, a lens and a casing is provided. The optical machine is configured to form an optical image. The lens is located on a projection path of the optical machine so that the optical image is projected on the lens. The casing is configured to receive the optical machine and the lens. The casing is provided with a positioning mark, which is aligned with an imaging center of the optical image in a vertical direction and configured to align the imaging center of the optical image with a center of a projection screen.

Abstract: A method for controlling projectors includes identifying a first projector and a second projector by using a database, acquiring a first control code of the first projector and a second control code of the second projector after the first projector and the second projector are identified, and generating at least one control signal to the first projector and the second projector for controlling operational actions of the first projector and the second projector according to the first control code and the second control code.