Abstract: A power providing apparatus includes a first input port for connection to a first electricity source, a second input port for connection to a second electricity source, an output port, a first current control component connected between the first input port and the output port, and a second current control component connected between the second input port and the output port. Based on voltages associated with the first electricity source and the second electricity source, each of the first and the second current control components makes or breaks a current path from a respective one of the first and second input ports to the output port.

Abstract: A power providing apparatus includes a first input port for connection to a first electricity source, a second input port for connection to a second electricity source, an output port, a first current control component connected between the first input port and the output port, and a second current control component connected between the second input port and the output port. Based on voltages associated with the first electricity source and the second electricity source, each of the first and the second current control components makes or breaks a current path from a respective one of the first and second input ports to the output port.

Abstract: A display unit includes a housing having a front end portion, upper and lower walls, and two opposite side walls, and formed with a rib that protrudes from one of the upper and lower walls and that extends between the side walls in a transverse direction relative to the side walls, and a retaining groove that is indented from the other of the upper and lower walls, and that extends between the side walls in the transverse direction. When two of the display units are stacked one above the other, the rib on one of the display units is fitted into the retaining groove in the other of the display units. A screen is mounted on the front end portion of the housing. An image projecting device is mounted in the housing for projecting images onto the screen.

Abstract: An angle-adjustable solar energy device includes: a fixed supporting frame having at least one cell that defines a cell space; a coupling frame received in the cell space, defining a frame space, and pivoted to the cell of the fixed supporting frame so as to be rotatable relative to the fixed supporting frame about a first axis; a solar cell carrier including a holder that is adapted to hold a solar cell, that extends into the frame space, and that is pivoted to the coupling frame so as to be rotatable relative to the coupling frame about a second axis which intersects the first axis; a universal joint connected to the holder; and a driving unit connected to the holder through the universal joint.

Abstract: An adjustable mounting device includes a base, first and second linearly displaceable support units, and first and second tiltable support units. The first linearly displaceable support unit is mounted movably on the base, and is operable to move along a first axis relative to the base. The first tiltable support unit is mounted pivotally to the first linearly displaceable support unit, and is operable to pivot about a second axis relative to the base. The second linearly displaceable support unit is mounted movably on the first tiltable support unit, and is operable to move along the second axis relative to the base. The second tiltable support unit is mounted pivotally to the second linearly displaceable support unit, and is operable to pivot about the first axis relative to the base.

Abstract: A display unit includes: a housing having a front end defining a front opening, and an inner wall formed with first nut seats and support seats; screw rods, each of which extends through a respective support seat, a respective first nut seat, and the front opening, and each of which engages threadedly the respective first nut seat; a screen frame mounted on the front end of the housing and having an inner wall that is formed with second nut seats aligned respectively with the first nut seats and the support seats; a screen mounted on the screen frame for covering the front opening; and an image projecting device mounted in the housing for projecting images onto the screen. Each of the screw rods engages threadedly a respective second nut seat.

Abstract: A display unit includes a housing having a front end portion, upper and lower walls, and two opposite side walls, and formed with a rib that protrudes from one of the upper and lower walls and that extends between the side walls in a transverse direction relative to the side walls, and a retaining groove that is indented from the other of the upper and lower walls, and that extends between the side walls in the transverse direction. When two of the display units are stacked one above the other, the rib on one of the display units is fitted into the retaining groove in the other of the display units. A screen is mounted on the front end portion of the housing. An image projecting device is mounted in the housing for projecting images onto the screen.

Abstract: A display apparatus includes a display housing, a mounting device, and an optical instrument. The mounting device includes an outer frame unit disposed in the display housing, and an inner frame unit coupled slidably to the outer frame unit, and movable relative to the outer frame unit between a first position, where the inner frame unit is disposed in the outer frame unit, and a second position, where the inner frame unit is extended out of the outer frame unit. The optical instrument is mounted on the inner frame unit of the mounting device.

Abstract: An electronic writing apparatus includes a transparent writing board mounted in front of a display surface of a display unit and having a writing surface distal from the display surface of the display unit. The writing board permits transmission of a light signal with a wavelength within a range from 400 nm to 700 nm therethrough. A triangulation device includes a position sensing module mounted on the writing surface of the writing board and coupled to the display unit. The position sensing module outputs an output signal associated with contact position information of a stylus on the writing surface to the display unit. The display unit generates an output image corresponding to writing trace of the stylus on the writing surface based on the output signal received from the position sensing module.

Abstract: A rear-project video assembly with a foldable reflector includes a housing and a screen mounted in a first side of the housing. A reflector has one side pivotally connected to a second side of the housing for reflecting image to the screen. An overhead projector is mounted on a bottom of the housing for projecting image to the reflector and a drive device is mounted between the screen and the reflector for expanding the reflector when using the reflector and backward moving the reflector after using the reflector to reduce the volume of the rear-project video assembly. A bellows is mounted between the peripheries of the second side of the housing and the reflector to prevent the foreign matter and the light ray from entering the housing.