Abstract: A traffic signal lamp includes a plurality of light-emitting devices. Each light-emitting device includes a light-emitting element, a power distribution module, a power module, a controller and a measuring element. The power module is configured for converting an alternating current (AC) into a direct current (DC) and supplying the DC to the light-emitting element and the power distribution module. The measuring element is electrically coupled to the power distribution module and the light-emitting element. The controller is electrically coupled to the power distribution module and the measuring element. When a selected-one of the light-emitting devices receives the AC, the power distribution modules of the selected-one provides the DC to the controller and the measuring element of the selected-one and the power distribution module of the others of the light-emitting devices.

Abstract: A projection lens includes a first and a second optical lens assembly. The first optical lens assembly is configured to transmit an image beam to the second optical lens assembly, which projects out the image beam from the projection lens. The second optical lens assembly includes a first and a second reflective element, and an optical member disposed between the first and the second reflective element and including a translucent region and a reflective region. The first reflective element is configured to reflect the image beam from the first optical lens assembly and transmit to the translucent region, which allows the image beam from the first reflective element to pass through and transmit to the second reflective element. The second reflective element is configured to reflect the image beam from the translucent region and transmit to the reflective region, which reflects the image beam from the second reflective element.

Abstract: A projection device includes a light source module, a display panel, a freeform-surface reflective mirror, and a projection lens. The light source module includes a light source, a first Fresnel lens element, and a second Fresnel lens element. The first Fresnel lens element and the second Fresnel lens element are parallel to each other and located between the light source and the display panel. The display panel is arranged between the light source module and the freeform-surface reflective mirror. The projection lens is configured to transmit an image beam out of the projection device, and a direction of an optical axis of the projection lens is different from a direction of a normal of the first Fresnel lens element.

Abstract: An optical engine module including a display panel, a transflective layer, a polarizing reflective layer, a first bifocal lens, a first and second electrically controlled half waveplate is provided. The transflective layer is disposed between the display panel and the polarizing reflective layer. The polarizing reflective layer is configured to allow the light beam having a first polarization state to pass through, and reflect the light beam having a second polarization state. The first and second electrically controlled half waveplate are disposed between the transflective layer and the polarizing reflective layer. The first bifocal lens disposed between the first and second electrically controlled half waveplate has a first focal length for the light beam with the first polarization state, and has a second focal length for the light beam with the second polarization state.

Abstract: A projection device including an imaging module, a freeform-surface reflective mirror, and a projection lens assembly is provided. The imaging module is configured to provide imaging beams and includes a display panel and a light-source module. The imaging beams are transmitted toward the projection lens assembly by the freeform-surface reflective mirror. The projection lens assembly includes a first optical axis and a second optical axis. The first optical axis passes through the projection lens assembly. The imaging beams emitted by the projection device form an imaging-beam region, in which the first optical axis does not pass through a geometric center of the imaging-beam region, and the second optical axis passes through a geometric center region of the display panel. The geometric center region is a region having a distance less than or equal to 40% of a minimum width of the display panel from a geometric center of the display panel.

Abstract: A projection lens includes a first lens group, a second lens group and an aperture stop. The first lens group is disposed between a reduced side and a magnified side. The second lens is disposed between the first lens group and the magnified side. The second lens group has a light incident surface, a reflective surface and a light emitting surface, the light incident surface faces the first lens group, the light emitting surface faces a projection surface, the light incident surface, the light emitting surface and the first lens group are disposed at a single side of the reflective surface, and at least one of the light incident surface, the reflective surface and the light emitting surface is a freeform surface. The aperture stop is disposed between the first lens group and the second lens group. Moreover, a projection apparatus including the projection lens is also provided.

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: An electrically controlled optical screen including a switchable scattering element and an electrically controlled decorating module is provided. The switchable scattering element is disposed on a side of the electrically controlled decorating module and is configured to switch between a scattering state and a transparent state. The electrically controlled decorating module includes a first polarizer, a first quarter-wave plate, a cholesteric liquid crystal layer, an electrically controlled wave plate, a second quarter-wave plate and a second polarizer, which are sequentially stacked. The electrically controlled wave plate has a liquid crystal layer. The second polarizer is disposed between the switchable scattering element and the second quarter-wave plate.

Abstract: A traffic signal lamp includes a plurality of light-emitting devices. Each light-emitting device includes a light-emitting element, a power distribution module, a power module, a controller and a measuring element. The power module is configured for converting an alternating current (AC) into a direct current (DC) and supplying the DC to the light-emitting element and the power distribution module. The measuring element is electrically coupled to the power distribution module and the light-emitting element. The controller is electrically coupled to the power distribution module and the measuring element. When a selected-one of the light-emitting devices receives the AC, the power distribution modules of the selected-one provides the DC to the controller and the measuring element of the selected-one and the power distribution module of the others of the light-emitting devices.

Abstract: A lamp device includes a controller, a plurality of light-emitting elements, a plurality of current conversion modules and an interpretation module. The controller is configured to output a dimming signal. The current conversion modules are coupled to the light-emitting elements and configured to control the light-emitting elements to emit light. The interpretation module is coupled to the current conversion modules and configured to output, according to a comparison table, a plurality of control signals corresponding to the dimming signal to the current conversion modules respectively. The light-emitting elements are different in a luminous property, and one of the current conversion modules is configured to output a feedback signal to the controller.

Abstract: A fixed-focus projection lens module used for projecting an image beam provided by a light valve onto a screen is provided. The fixed-focus projection lens module includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a light-transmitting element arranged in sequence from a screen side to a display side along an optical axis. The fixed-focus projection lens module satisfies: 1<|OAL/BFL|<2.1, and OAL is a distance from the screen side surface of the first lens to the display side surface of the seventh lens on the optical axis, BFL is a distance from the screen side surface of the light-transmitting element to a display surface of the light valve on the optical axis.

Abstract: A projection lens includes a first lens group, an aperture stop, a second lens group, a reflective optical element, and a refractive optical element arranged in sequence on a transmission path of an image beam. The first lens group, the aperture stop and the second lens group are sequentially arranged from a minified side to a magnified side along an optical axis. The reflective optical element and the refractive optical element are located on opposite sides of the optical axis. The image beam sequentially passes through the first lens group, the aperture stop and the second lens group from the minified side to be transmitted to the reflective optical element. The image beam is reflected by the reflective optical element to the refractive optical element, and passes through the refractive optical element to form a projection beam toward the magnified side.

Abstract: An imaging system, including a light valve and a projection lens, is provided. The projection lens has a reduction side and a magnification side, and includes a lens group and a convex mirror. The light valve is configured on the reduction side. The projection lens is configured to image the beam from the light valve on a projection surface, and the projection surface is configured on the magnification side. There is an included angle between the projection surface and a light receiving surface. The lens group is configured on an optical path between the magnification side and the reduction side, and includes first to seventh lens elements sequentially arranged from the magnification side to the reduction side. The refractive powers of the first to seventh lens elements are respectively negative, negative, positive, positive, negative, positive, and positive. The convex mirror is configured on an optical path between the lens group and the magnification side.

Abstract: The application provides a light device control system, a light device controller and a control method thereof. The light device controller includes: a detection circuit for detecting an input voltage; and a control unit coupled to the detection circuit, the control unit controlling the detection circuit to perform continuous detection during a predetermined interval, and the detection circuit sends a plurality of detection results due to continuous detection to the control unit, wherein whether a corresponding light device is failed is determined based on the plurality of detection results.

Abstract: The application provides a light device control system, a light device controller and a control method thereof. The light device controller includes: a detection circuit for detecting an input voltage; and a control unit coupled to the detection circuit, the control unit controlling the detection circuit to perform continuous detection during a predetermined interval, and the detection circuit sends a plurality of detection results due to continuous detection to the control unit, wherein whether a corresponding light device is failed is determined based on the plurality of detection results.

Abstract: The present disclosure relates to a pixel circuit including a light emitting element, a driving circuit, a first data storage circuit and a second data storage circuit. The driving circuit is electrically coupled to the light emitting element. The first data storage circuit is electrically coupled to the driving circuit, and is configured to transmit a first data signal to the driving circuit during a first frame period, so that the driving circuit drives the light emitting element according to the first data signal. The second data storage circuit is electrically coupled to the driving circuit, and is configured to receive a second data signal during the first frame period.

Abstract: An imaging system, including a light valve, a projection surface, and a projection lens, is provided. The projection lens has a reduction side and a magnification side, and includes a lens group and a convex mirror. The light valve is configured on the reduction side. The projection surface is configured on the magnification side. There is an included angle between the projection surface and a light receiving surface. The lens group is configured on an optical path between the magnification side and the reduction side, and includes first to seventh lens elements sequentially arranged from the magnification side to the reduction side. The refractive powers of the first to seventh lens elements are respectively negative, negative, positive, positive, negative, positive, and positive. The convex mirror is configured on an optical path between the lens group and the magnification side. A projection device, including the imaging system, is also provided.

Abstract: A projection lens includes a first lens group, a second lens group and an aperture stop. The first lens group is disposed between a reduced side and a magnified side. The second lens is disposed between the first lens group and the magnified side. The second lens group has a light incident surface, a reflective surface and a light emitting surface, the light incident surface faces the first lens group, the light emitting surface faces a projection surface, the light incident surface, the light emitting surface and the first lens group are disposed at a single side of the reflective surface, and at least one of the light incident surface, the reflective surface and the light emitting surface is a freeform surface. The aperture stop is disposed between the first lens group and the second lens group. Moreover, a projection apparatus including the projection lens is also provided.

Abstract: The present disclosure relates to a pixel circuit including a light emitting element, a driving circuit, a first data storage circuit and a second data storage circuit. The driving circuit is electrically coupled to the light emitting element. The first data storage circuit is electrically coupled to the driving circuit, and is configured to transmit a first data signal to the driving circuit during a first frame period, so that the driving circuit drives the light emitting element according to the first data signal. The second data storage circuit is electrically coupled to the driving circuit, and is configured to receive a second data signal during the first frame period.

Abstract: The invention provides a projection zoom lens and a projector. The projection zoom lens includes a first lens group and a second lens group sequentially arranged along an optical axis from a screen end to an image source end. The first lens group has a negative refractive power and includes a first lens, a second lens, and a third lens. The second lens group has a positive refractive power and includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens. The first lens to the twelfth lens are sequentially arranged along the optical axis from the screen end to the image source end, and the refractive powers of the first lens to the twelfth lens are negative, negative, positive, positive, positive, negative, negative, positive, positive, negative, positive, and positive.