Abstract: A method for adjusting a projection parameter and a projection system are disclosed. In the projection system, a processor is configured to drive multiple projectors to project multiple projection images respectively and obtain a full projection range through calculation, select a target area from at least one overlapping area included in the full projection range and obtain a target projection parameter value of the target area, obtain multiple intersection points of the overlapping area on a boundary of the full projection range, define connecting lines between a center point of the target area and the intersection points as dividing lines to divide the full projection range into multiple sub-areas, respectively adjust a projection parameter value of each of the sub-areas according to the target projection parameter value of the target area, and perform projection through the corresponding projector based on the adjusted projection parameter value of each of the sub-areas.

Abstract: A stereo projection screen including a scattering screen having a scattering structure layer, a phase retardation layer disposed between the scattering structure layer and the polarized projector, and a metal reflection layer covering at least a part of the scattering structure layer is provided. The scattering structure layer and the phase retardation layer are arranged in a first display area and a second display area of the stereo projection screen. The metal reflection layer is arranged in at least one of the first display area and the second display area. A first image light beam having a first polarization state has a second polarization state after being transmitted to the first display area and leaving the stereo projection screen. A second image light beam having the first polarization state still has the first polarization state after being transmitted to the second display area and leaving the stereo projection screen.

Abstract: A projection device includes a casing, a light source module, a light valve module, a projection lens, a heat dissipation module, and a fan disposed in the casing. The casing has at least one air inlet, a first air outlet, and a second air outlet. The heat dissipation module is coupled to the light source module and the light valve module and configured to cool the light source module and the light valve module. The fan has a first air exhaust and a second air exhaust. The first air exhaust and the second air exhaust are respectively disposed at positions adjacent to the first air outlet and the second air outlet of the casing.

Abstract: A projection device includes a casing, a projection lens, a light valve module, a light source module, a first heat dissipation module, a second heat dissipation module, a fan, and a guiding member. The first heat dissipation module is disposed corresponding to a first air inlet of a first side cover and connected to the light valve module, and the second heat dissipation module is disposed corresponding to a second air inlet of a second side cover and connected to the light source module. An airflow in an accommodating space of the casing is guided to the guiding member by the fan, and is transferred from the guiding member to an air outlet to flow out of the casing. A direction of an image beam of the projection lens is different from an airflow direction flowing out from the air outlet of a third side cover.

Abstract: An illumination system including a plurality of light-emitting elements, a light combining module, a first lens group, a second lens group and a wavelength conversion device is provided. The plurality of light-emitting elements provide a plurality of first light beams. The light combining module is used for combining the plurality of first light beams into a second light beam. The wavelength conversion device is used for converting the second light beam into the third light beam or reflecting the second light beam. The first lens group has a first central axis. The first lens group includes a first part and a second part which are symmetrical with respect to the first central axis and have equal areas, and a luminous flux of the second light beam passing through the first part is greater than a luminous flux passing through the second part.

Abstract: An ultra-short focus projection lens is configured to receive an image beam from an image source side and project the image beam toward a projection surface. The ultra-short focus projection lens has an optical axis. The ultra-short focus projection lens includes a reflective optical element, a first lens group, a stop, and a second lens group arranged in sequence along the optical axis. The image beam from the image source side passes through the second lens group, the stop, and the first lens group in sequence, and is reflected by the reflective optical element and projected to the projection surface. The first lens group includes a plurality of lenses having diopters. The second lens group 10 includes a plurality of lenses having diopters. The first lens group and the second lens group include ten lenses having diopters in total. A projection device is also provided.

Abstract: A projection device of the present invention includes a casing, a light source module, a light source thermal module, a fan, and a projection lens; wherein the light source module, the light source thermal module, the fan and the projection lens are disposed in the casing, and the casing has a first side wall, a second side wall, and a bottom plate, wherein the first side wall includes a first air inlet, and the second side wall includes an air outlet; the orthographic projection range of the air outlet on the first side wall overlaps with the orthographic projection range of the light source thermal module on the first side wall, and the orthographic projection range of the projection lens on the first side wall does not overlap with the orthographic projection range of the light source thermal module on the first side wall.

Abstract: A projection device includes a shell, a lens, two first ribs, two second ribs, and a sliding cover. The shell has a top plate, a left sidewall, and a right sidewall, the top plate is respectively connected to the left sidewall and the right sidewall, and the top plate has an opening. The lens is disposed in the shell and exposed by the opening. The two first ribs are disposed on the top plate, extending directions of the two first ribs are perpendicular to the left sidewall and the right sidewall, and the opening is disposed between the two first ribs. The sliding cover is slidably disposed on the shell for covering the opening. The two second ribs are disposed on a top cover body of the sliding cover, and one of the two second ribs is located between the two first ribs.

Abstract: A projection lens projecting an image beam provided by a light valve onto a screen is provided. The projection lens includes first to fourth lenses in order from a screen side to a display side along an optical axis. Each lens has a screen side surface facing the screen side and allowing the image beam to pass, and a display side surface facing the display side and allowing the image beam to pass. The first and third lenses have a negative refractive power, and the second and fourth lenses have a positive refractive power. The projection lens satisfies 2<TTL/f<5. TTL is a distance from the screen side surface of the first lens to the display side surface of the fourth lens on the optical axis. f is an effective focal length of the projection lens. The projection lens covers a wide range of operating temperatures while being lightweight.

Abstract: A wavelength conversion module includes a driving element, a wavelength conversion wheel, and at least one flow guide. The wavelength conversion wheel includes a rotary disc and at least one wavelength conversion layer. The driving element is connected to the rotary disc to drive the wavelength conversion wheel to rotate along an axis of the driving element as a central axis. The flow guide is disposed beside the wavelength conversion wheel at intervals along the axis, and at least one airflow channel is formed between the flow guide and the wavelength conversion wheel. The flow guide and the driving element are disposed at intervals, and the flow guide does not contact the rotary disc and the driving element. An orthographic projection of the flow guide on the rotary disc overlaps the wavelength conversion layer. When the wavelength conversion wheel rotates, the wavelength conversion wheel and the flow guide move relatively.

Abstract: A color wheel module and a projector are provided. The projector includes the color wheel module, and the color wheel module includes a disk, an isolation framework, an assembly member, and an adhesive filler. The disk is configured to rotate around an axis. The isolation framework and the assembly member are disposed on the disk. The isolation framework is located between the disk and the assembly member. An air layer is formed between the assembly member and the isolation framework. The adhesive filler is disposed on the assembly member.

Abstract: A backlight module includes a light source, a first prism sheet disposed on the light source, and a light type adjustment sheet disposed on a side of the first prism sheet away from the light source and including a base and multiple light type adjustment structures. The multiple light type adjustment structures are disposed on the first surface of the base. Each light type adjustment structure has a first structure surface and a second structure surface connected to each other. The first structure surface of each light type adjustment structure and the first surface of the base form a first base angle therebetween, and the second structure surface of each light type adjustment structure and the first surface of the base form a second base angle therebetween. The angle of the first base angle is different from the angle of the second base angle.

Abstract: A manufacturing method of a waveguide and a head mounted display device having the waveguide are provided. The head mounted display device includes a display unit, a first waveguide and a second waveguide. The display unit is configured to provide an image beam. The first waveguide is located between the display unit and the second waveguide. The first waveguide is configured to transmit the image beam to the second waveguide and adjust a light shape of the image beam to maintain a field angle and expand a pupil in a single dimension. The second waveguide is configured to transmit the image beam to outside of the head mounted display device, and the second waveguide can extend a light transmission path and provide a uniform image beam.

Abstract: A wheel provided by the disclosure includes a substrate, a driving component, a clamping element and a balance component. The driving component is connected to the substrate, and is configured to drive the substrate to rotate about the axis of the driving component as the central axis. The clamping element is arranged on the substrate along the axis, and the clamping element includes a plurality of protruding structures. The balance component includes a balance substance and an adhesive. The balance substance is arranged on the protruding structure, and the adhesive covers the balance substance and the protruding structure to fix the balance component on the clamping element. The wheel and projection device provided by the disclosure have better structural reliability and heat dissipation efficiency.

Abstract: A display system suitable for a vehicle is provided. The display system suitable for the vehicle includes a center console, a processing device, and a display device. The center console is configured to generate a power sequence according to a customization setting, and the power sequence corresponds to content of a data table. The processing device is configured to receive the power sequence and decodes the power sequence through a lookup table to generate a decoding result. The lookup table includes the content of the data table. The display device is coupled to the processing device and is configured to display a display image according to the decoding result.

Abstract: A projection device including a casing, a light source module, an optical engine module and a projection lens is provided. A front cover, a rear cover, a first side cover, a second side cover, an upper cover and a lower cover of the casing surround an accommodating space. The light source module includes a first and a second light sources, and a first and a second light source heat dissipation modules. The lower cover has a first, a second and a third air inlets. The first and the second side covers respectively have a first and a second air outlets. The first and the second light source heat dissipation modules are correspondingly disposed above the first air inlet and correspond to the first air outlet. The second and the third air inlets are respectively disposed below two sides of the projection lens and adjacent to the front cover.

Abstract: A multi-projector system and a method of calibrating the multi-projector system are provided. The method includes: controlling a first projector to project a first image, and capturing and generating a first captured image including the first image to obtain a first color value from the first captured image through an image capturing device; projecting a second image according to a first projection parameter, and capturing and generating a second captured image including the second image to obtain a second color value from the second captured image through the image capturing device, wherein the first projection parameter includes an electrical parameter of a light source module of the second projector; calculating an absolute difference between the first color value and the second color value; and adjusting the first projection parameter to update the absolute difference in response to the absolute difference being greater than a first threshold.

Abstract: A backlight module including a light guide plate, a light source, a diffuse reflector and a light-splitting film is provided. The light guide plate has a light incident surface, and a light-emitting surface and a bottom surface which are respectively connected to the light incident surface and opposite to each other. The light source is disposed on one side of the light incident surface of the light guide plate. The diffuse reflector is disposed on one side of the bottom surface of the light guide plate. The light-splitting film is disposed between the light guide plate and the diffuse reflector. The light-splitting film has a substrate and a plurality of first optical microstructures disposed on one side of the substrate. An extending direction of the first optical microstructures intersects with the light incident surface of the light guide plate. A display apparatus using the backlight module is also provided.

Abstract: An interactive projection system including a projector and a touch interactive light source device is provided. The projector includes a projection optical engine, a camera module, and a control module. The touch interactive light source device includes at least one infrared light source module and a wireless signal transmission module. The control module is electrically connected to the projection optical engine and the camera module, and controls the touch interactive light source device through the wireless signal transmission module, so that the touch interactive light source device is placed in a recommended installation position and the interactive projection system is in an interactive mode. An operation method of the interactive projection system is also provided.

Abstract: A wavelength conversion element is provided. The wavelength conversion element includes a substrate, a wavelength conversion layer, a reflective layer, and a heat conductive layer. The wavelength conversion layer is disposed on the substrate. The reflective layer is disposed on the substrate and is located between the substrate and the wavelength conversion layer. The heat conductive layer is disposed on the substrate, and at least a portion of the heat conductive layer is located between the substrate and the reflective layer. A projector is also provided, and the projector includes the wavelength conversion element. The wavelength conversion element exhibits a favorable heat dissipation effect and provides improved conversion efficiency, so that the projector exhibits favorable projection quality and product competitiveness.