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: An image display system includes a set of projectors, a screen, and an auxiliary projector. The set of projectors is used for generating a plurality of light beams and projecting the plurality of light beams to a region of an image plane. The screen faces the set of projectors for providing the image plane in order to generate a three-dimensional image object by the plurality of light beams projected to the region of the image plane. The auxiliary projector is used for generating and projecting at least one additional light beam to the region of the image plane in order to increase perspective information of incident light of the three-dimensional image object on a view point within a visual field.

Abstract: A light detection circuit for a projector is provided. The light detection circuit includes: a light transistor for receiving and sensing reflected light from a side of a color wheel driving motor of the projector, wherein the side of the color wheel driving motor includes a dark region and a bright region; a bias unit coupled to the light transistor for providing a bias voltage; an operation amplifier including a positive input coupled to the bias unit, a negative input coupled to the light transistor and the bias unit, and an output, the base unit providing the bias voltage to the positive input; and a feedback resistor coupled between the negative input of the operation amplifier and the output, wherein, a resistance of the feedback resistor causes the light transistor to be operated in a linear region.

Abstract: An ambient light rejecting screen used in a laser light source projector, which generates a light with a first wavelength and a light with a second wavelength, is provided. The screen includes a base, a light absorbing layer, a first filter layer and a second filter layer. The light absorbing layer is disposed on the base. The first filter layer is disposed on the light absorbing layer. The crystallization characteristic of the first filter layer corresponds to the light with the first wavelength and generates a reflective light with the first wavelength, and allows the light with remaining wavelengths to pass through. The second filter layer is disposed on the light absorbing layer. The crystallization characteristic of the second filter layer corresponds to the light with the second wavelength used to generate the reflective light with the second wavelength and allows the light with remaining wavelengths to pass through.

Abstract: A projection device includes a projection lens, a first laser light source, a second laser light source and a polarization direction. The first laser light source and the second laser light source respectively emit a first laser light to the projection lens through a laser optical path, wherein the first laser light has a first polarization direction. The polarization direction conversion layer is disposed on the laser optical path and configured to convert the first laser light of the first laser light source into a second laser light, wherein the second laser light has a second polarization direction different from the first polarization direction.

Abstract: A method for identifying video signal source is provided. The method includes the following steps. A first identification code is assigned to a first transmitter device by a receiver control unit of a receiver device. A first video data is transmitted by the first transmitter device. The first video data and a first identification image corresponding to the first identification code are combined as a first combined video data by the receiver control unit. The first combined video data is outputted to a display device by the receiver control unit.

Abstract: A video conference system including a first transmitter device and a receiver device is provided. The first transmitter device transmits a first video data. The receiver device includes a receiver control unit configured to assign a first identification code to the first transmitter device. The receiver control unit combines the first video data and a first identification image corresponding to the first identification code as a first combined video data and the receiver control unit outputs the first combined video data to the display device. Through the present invention, the conference participants can quickly identify which presenter is providing the video signal source corresponding to a particular frame on the split screen, and can raise questions to the right person.

Abstract: A video conference system including a transmitter device and a receiver device is provided. The transmitter device includes a transmitter control unit, a transmitter input interface, a transmitter video circuit and a first wireless transmission module. The transmitter control unit is coupled to a video output port of an information system and receive a first video data from the video output port. The transmitter input interface receives a second video data from a first video source. The transmitter video circuit combines the first video data and the second video data as a combined video data. The first wireless transmission module transmits the combined video data to the receiver device. The receiver device, coupled to the display device, includes a second wireless transmission module, which receives the combined video data. The receiver device transmits the combined video data to the display device.

Abstract: A video conference system including a transmitter device, a first receiver device and a second receiver device is provided. The transmitter device includes a transmitter control unit, a first network interface and a first wireless transmission module. The first receiver device includes a second wireless transmission module, a first receiver input interface and a first receiver video circuit. The second receiver device includes a second network interface and a second receiver video circuit. The first receiver video circuit combines the first video data and the second video data as a first combined video data. The first receiver video circuit transmits the first combined video data to a first display device, and outputs the first combined video data to the transmitter device, which outputs the first combined video data to the second receiver device through the first network interface and the second network interface.

Abstract: An image display method includes setting a plurality of frame rate intervals and a plurality of backlight driving signal adjustment modes, acquiring a data clock signal, detecting a first frame rate of the data clock signal, adjusting a first power distribution of a backlight driving signal according to a first backlight driving signal adjustment mode of the plurality of backlight driving signal adjustment modes when the first frame rate falls into a first frame rate interval of the plurality of frame rate intervals, and displaying an image according to at least the data clock signal and the backlight driving signal.

Abstract: A key preloading structure including a base, a set of switches and a set of keys is provided. The set of switches is arranged on the base. The set of keys has a rotating shaft and two extended elastomers. The rotating shaft is assembled on the base. One end of each extended elastomer is fixedly connected to the rotating shaft, and another end is disposed on the set of switches. Each of the two extended elastomers preloads the set of switches with a gravity less than a triggering force for starting the set of switches.

Abstract: A wireless transmission device is provided. The wireless transmission device includes a body, a connection cable electrically connected to the body, and at least one fixing member. The body includes a slot and a first fixing base. The connection cable includes a plug and a second fixing base. The plug matches the slot, and the second fixing base and the first fixing base are opposite to each other in a vertical manner. The at least one fixing member is inserted into the first fixing base and the second fixing base to fix the plug in the slot. The present invention increases the coupling stability between the body and the connection cable, stabilizes signal transmission, reduces maintenance cost, and provides an integrated appearance.

Abstract: A projection system includes a light source, a projection lens, and a light-adjusting diaphragm element. The light source emits a first light having a first dominant wavelength range and a second dominant wavelength range. The projection lens is disposed on the path of the first light. The light-adjusting diaphragm element, disposed between the light source and the projection lens, has an opening and a light shielding area outside the opening, a filter is disposed in the opening, wherein a part of the first light is blocked by the light shielding area, a wavelength band corresponding to the first dominant wavelength range of other part of the first light passes through the opening, and a wavelength band corresponding to the second dominant wavelength range of the other part of the first light is blocked by the filter to become a second light having a narrow wavelength range.

Abstract: A multi-screen splicing structure has a plurality of display devices. Each display device includes a display panel, a plurality of transceivers, a wireless communications module, and a control circuit. Each transceiver has a transmitting component and a receiving component. The control circuit is coupled to the display panel, the transceivers and the wireless communications module, and is used to turn on the wireless communications module when the control circuit determines that another display device is approaching based on a status of signals received by the receiving components of the transceivers to enable the wireless communications module performing wireless communications with a wireless communications module of another display device. The control circuit may also control an orientation of an image relative to the display panel according to the status of signals received by the receiving components of the transceivers of the display device.

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 system including at least a light source, at least a dichroic filter element and a light-adjusting diaphragm element is provided. The light source is configured to emit a first color light having a spectrum of a first wavelength range and a second color light having a spectrum of a second wavelength range. The dichroic filter element is configured to reflect or allow the first color light and the second color light to pass through. The light-adjusting diaphragm element has a filter and is located on an optical path generated after the first color light and the second color light are split. The first color light passes through the filter, which blocks at least a part of the energy of the second color light, such that a transmittance of the spectrum of the first wavelength range is greater than that of the spectrum of the second wavelength range.

Abstract: A display system for calibrating a displayed image includes a monitor device and a calibration device. The monitor device is used for displaying a calibration interface when an image calibration process is performed. The calibration device is coupled to the monitor device for selecting a calibration mode through the calibration interface. The calibration interface includes at least one calibration mode. The calibration device selects and confirms the calibration mode from the at least one calibration mode by using at least one key.

Abstract: A color calibrator used to correct the display color of a display device is provided. The color calibrator includes a color correction module, a cover and a combiner. The color correction module includes a color correction unit for correcting the display color. The cover is connected to the color correction module to selectively expose or cover the color correction unit. The combiner is disposed on the cover, and the combiner is connected to the display device when the cover exposes the color correction unit.

Abstract: A display method includes changing a first transmission rate of a panel data clock signal to a second transmission rate, changing a first vertical synchronization period of a vertical synchronization signal to a second vertical synchronization period including a vertical pixel active synchronization interval and a blank interval according to at least the second transmission rate of the panel data clock signal, and merely enabling a backlight device during a time interval of any length within the blank interval. The second transmission rate is greater than the first transmission rate. The second vertical synchronization period is greater than the first vertical synchronization period.