Abstract: A heat dissipation module disposed in a projection device and dissipating heat from a heat source includes a heat dissipation member, a thermoelectric cooler, a heat conduction member, and a sealant. The thermoelectric cooler has a heat absorbing surface, a heat dissipating surface contacting the heat dissipation member, and a first side surface adjacent between the heat absorbing surface and the heat dissipating surface. The heat conduction member has a first contact surface, a second contact surface opposite to the first contact surface, and a second side surface adjacent between the first and the second contact surfaces. The first contact surface contacts the heat source, and at least part of the second contact surface contacts the heat absorbing surface. The sealant is filled between the heat dissipation member and the heat source to cover the first side surface and the second side surface. A projection device is also provided.

Abstract: A display device including at least two light source modules and a display control substrate is provided. Each of the at least two light source substrates has a first surface and a second surface opposite to each other and includes a plurality of light emitting elements and a plurality of connection pads. The light emitting elements are located on the second surface, and the connection pads are located on the first surface and are electrically connected to the light emitting elements. The display control substrate includes a back plate and a plurality of control elements. The control elements are located on the back plate, part of the control elements are electrically connected to the connection pads to drive and control the light emitting elements, and the second surface of each of the at least two light source substrates forms a part of a display surface of the display device.

Abstract: An optical structure film and a light source module are provided. The optical structure film includes multiple optical unit microstructures. Each of the optical unit microstructures has four side surfaces and an inwardly concave beam splitting surface. The beam splitting surface is respectively connected to the side surfaces, and the beam splitting surface has four endpoints when viewed from a front viewing angle. Connection lines of the four endpoints form a rectangle. The beam splitting surface includes at least one beam splitting curved surface. A junction of the at least one beam splitting curved surface and one of the four side surfaces is a first line segment. A projection of a midpoint of an edge of the rectangle on the beam splitting surface overlaps with a relative extreme point of the first line segment.

Abstract: A backlight module includes a light guide plate, a light source, a first prism sheet, and a second prism sheet. The light source is disposed on a light incident surface of the light guide plate. The first prism sheet is disposed on a side of a light exiting surface of the light guide plate and has multiple first prism structures facing the light guide plate. The second prism sheet has multiple second prism structures facing the light guide plate. An included angle between an extending direction of the first prism structures and an extending direction of the second prism structures is greater than or equal to 85 degrees and less than or equal to 95 degrees. An included angle between the extending direction of the second prism structures and the light incident surface is greater than or equal to 85 degrees and less than or equal to 95 degrees.

Abstract: An anti-peep light source module includes a light source module and a viewing angle switching module. The light source module has a light source and a light guide plate (LGP) and has light emitting elements arranged along a first direction. The viewing angle switching module is located on a transmission path of an illumination beam of the light source module and includes a viewing angle limiting element and a viewing angle adjusting element configured to change a viewing angle of the illumination beam. The viewing angle limiting element has a grating structure and is located between the viewing angle adjusting element and the light source module. an included angle between an extension direction of the grating structure and the first direction is within a range from 88 degrees to 92 degrees. The anti-peep light source module and A display device achieve favorable optical performance, user experience, and production yield.

Abstract: A reflective diffusion device including a reflecting member and a diffusing member is provided, which are adapted for reflecting and diffusing an excitation light beam emitted from a light source module. The reflecting member has a central axis and includes a reflective surface facing the light source module. The diffusing member is disposed on a portion of the reflective surface of the reflecting member. The excitation light beam is incident on a first position of the reflective diffusion device in an incident direction parallel to the central axis, is reflected by the reflective surface and transmitted to a second position of the reflective diffusion device, and is then reflected by the reflective surface to maintain the excitation light beam or form a diffused light beam. The excitation light beam or the diffused light beam exits from the reflective diffusion device in an exit direction parallel to the central axis.

Abstract: A projection device including a light source module, an optical engine module and a projection lens is provided. The optical engine module includes a casing, a heat-conducting base, a heat pipe, a light valve and a thermal conductive layer. The casing has an opening. The heat-conducting base has an assembly opening, wherein the heat-conducting base is disposed on the casing, and the assembly opening is aligned with the opening of the casing. The heat pipe is connected to the heat-conducting base and disposed on the heat-conducting base. The light valve is disposed on the heat-conducting base corresponding to the assembly opening. The light valve is thermally coupled to the heat-conducting base through the thermal conductive layer. The light valve has a first stepped surface and a second stepped surface, and the thermal conductive layer covers at least a part of the first stepped surface and the second stepped surface.

Abstract: A reflective diffusion device includes a driving element having a rotation shaft, a reflective element including a central axis and disposed on the driving element, and a diffusion element. The central axis and the rotation shaft are collinear. The diffusion element is disposed on at least one portion of the reflective element, and the driving element drives the reflective element and the diffusion element to rotate along the central axis. A laser beam enters the diffusion element along an incident direction, is transmitted to the reflective element and reflected by the reflective element, and exits from the diffusion element along an exit direction to generate a diffusion beam. An incident angle between the incident direction and the central axis is greater than 0 degree, and an emergent angle between the exit direction and the central axis is greater than or equal to 0 degree.

Abstract: An illumination system including a light-emitting element, a wavelength conversion element, at least a first light homogenizing element and a second light homogenizing element is provided. The wavelength conversion element is configured to convert the excitation light beam into a conversion light beam, and through the wavelength conversion element, the excitation light beam and the conversion light beam sequentially form an illumination light beam. The at least one first light homogenizing element is configured to adjust a shape of a light spot formed by the excitation light beam on the wavelength conversion element. The second light homogenizing element is disposed on a transmission path of the illumination light beam from the wavelength conversion element, wherein a shape of a light incident surface of the at least one first light homogenizing element is the same as a shape of a light incident surface of the second light homogenizing element.

Abstract: A wavelength conversion element includes a substrate, a wavelength conversion layer and a heat dissipation member. The substrate has a supporting surface. The wavelength conversion layer is disposed on the supporting surface. The heat dissipation member is disposed on the supporting surface and is surrounded by the wavelength conversion layer. The heat dissipation member has a heat dissipation plate and a plurality of heat dissipation tooth portions. The heat dissipation plate is fixed on the supporting surface. The heat dissipation plate has an outer side surface. The outer side surface is perpendicular to the supporting surface. The heat dissipation tooth portions are respectively connected to the outer side surface. A projection device including the wavelength conversion element is also provided. The wavelength conversion element can improve wavelength conversion efficiency and reliability, and the projection device can improve image brightness and service life.

Abstract: A projection apparatus including a light source module, an eccentric-collimating lens, a prism lens group, a light valve and a projection lens is provided. The light source module is configured to provide an illumination light beam. The eccentric-collimating lens is disposed between the light sources and the light valve on a transmission path of the illumination light beam. The light valve is configured to convert the illumination light beam into an image light beam. The projection lens is configured to project the image light beam out of the projection apparatus. A first included angle between a first transmission direction of the illumination light beam incident on the eccentric-collimating lens and a central axis of the eccentric-collimating lens is greater than 0. The first transmission direction and a second transmission direction of the image beam exiting from the light valve are perpendicular to each other.

Abstract: A display device includes a touch panel, an optical adhesive layer, and a front light module that includes a light source and a light guide plate (LGP) including multiple microstructures recessed into the LGP from a first surface of the LGP to form voids. The optical adhesive layer is adhered between the touch panel and a first surface of the LGP. A surface of the optical adhesive layer facing the LGP is in contact with the first surface of the LGP in multiple first regions, and a surface of the optical adhesive layer facing the LGP and the plurality of microstructures being overlapped in multiple second regions. A maximum vertical distance between each void and the first surface is a first depth. A vertical distance between the first regions and the second regions is 0 to 0.7 times the first depth.

Abstract: An illumination system including two light source modules, two light guiding modules, a first reflector, and a light homogenization element is provided. The two light guiding modules are respectively disposed on transmission paths of light beams generated by the two light source modules to generate two guiding light beams. One of the guiding light beams is reflected to the light homogenization element by the first reflector. The other of the guiding light beams is directly transmitted to the light homogenization element. The guiding light beams are emitted from the light homogenization element and form an illumination light beam. A projection apparatus is also provided.

Abstract: An optical engine module and a projection device are provided. The optical engine module includes a first prism, a light valve, a second prism, and a light-shielding element. The first prism is disposed on a transmission path of an illumination light beam. The light valve is disposed on the transmission path of the illumination light beam from the first prism. The light valve has a reflection surface suitable for converting the illumination light beam into an image beam. The second prism is located between the first prism and the light valve, and is disposed on the transmission path of the illumination light beam from the first prism and on a transmission path of the image beam from the light valve. The light-shielding element is located between the first prism and the second prism.

Abstract: An illumination system for providing an illumination beam includes red, blue, and green light source modules, a first light combining element, and a light uniforming element. The red light source module includes a first red light emitting element emitting first red light and a second red light emitting element emitting second red light. A peak wavelength of the second red light is greater than a peak wavelength of the first red light. The blue light source module includes a first blue light emitting element emitting first blue light and a second blue light emitting element emitting second blue light. A peak wavelength of the second blue light is less than a peak wavelength of the first blue light. The green light source module generates green light. The first light combining element guides these lights into the light uniforming element, so that the illumination system outputs the illumination beam.

Abstract: An optical engine module configured to receive an illuminating beam is provided. The illuminating beam includes a first illuminating beam with a first linear polarization state. The optical engine module includes a first polarization beam splitting element, a first phase retardation element, and a first light valve. The first polarization beam splitting element is disposed on the transmission path of the illuminating beam and is configured to reflect the first illuminating beam to the first phase retardation element. The first phase retardation element is disposed on the transmission path of the first illuminating beam, and the first illuminating beam passes through the first phase retardation element and is transmitted to the first light valve. The first light valve is disposed on the transmission path of the first illuminating beam and is configured to convert the first illuminating beam into a first image beam.

Abstract: A method for generating virtual reality images and used in a light field near-eye display includes steps of: shifting a display image according to at least one change vector of a plurality of eye movement parameters, and calculating a compensation mask according to a simulated image and superimposing the compensation mask on a target image to generate a superimposed target image, wherein brightness distributions of the simulated image and the compensation mask are opposite to each other. The light field near-eye display is also provided. In this way, the light field near-eye display for generating virtual reality images and the method thereof can achieve the purpose of improving the uniformity of the image and expanding the eye box size.

Abstract: An optical engine module and a projection device are provided. The optical engine module includes a light source unit, a first diffusion element, a polarizing beam splitting element, a second diffusion element, and a light valve. The light source unit emits a light beam. The first diffusion element is disposed on a transmission path of the light beam. The polarizing beam splitting element is disposed on the transmission path of the light beam. The first diffusion element is disposed between the polarizing beam splitting element and the light source unit. The second diffusion element has at least one optical surface to reflect and diffuse the light beam. The light beam forms an illumination beam after passing through the second diffusion element, and the illumination beam has an optical image matching angle. The light valve is disposed on a transmission path of the illumination beam. The light valve converts the illumination beam to an image beam.

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: The disclosure provides a projection lens module and a projector having the projection lens module, which may effectively suppress the shaking of the projection lens. The projection lens module includes two casings, a projection lens and a carrier structure. The projection lens is disposed between the two casings. The carrier structure includes a bracket, at least one screwing member, and two buffer members. The bracket has at least one aperture, and the screwing member passes through the aperture to lock the bracket to the projection lens. A diameter of the aperture in a first direction is greater than a diameter of the aperture in a second direction perpendicular to the first direction. The two buffer members are respectively disposed on opposite ends of the bracket and lean against the two casings in the first direction, respectively.