Abstract: A sun tracking device comprises a light sensing module, a processing module, a control module, and a driving module. The light sensing module includes eight light sensors, a pole fixing portion, and a pole. The eight light sensors each have a light sensing surface. The pole fixing portion has a fixing surface. The eight light sensing surfaces and the fixing surface cooperatively form a 3×3 grid, and the fixing surface is in the middle of the grid. The pole extends from the fixing surface. The processing module is configured for determining the direction of the sun, and calculating a rotating direction and angle of the light sensing module. The control module is configured for sending out a rotating instruction. The driving module is configured for driving the light sensing module to rotate so that the sunlight perpendicularly shines onto the light sensing surface.

Abstract: Cutting equipment is used to cut an object. The object includes at least two preformed products. The cutting equipment includes a support device and a cutting device. The support device supports the object. The cutting device includes a laser emitter configured for emitting a first laser beam, and an optical splitter configured for splitting the first laser beam into at least two second laser beams. Each second laser beam is configured for cutting the object to separate one of the at least two preformed products from the object.

Abstract: A method of manufacturing an optical compound film includes providing a substrate, a first surface of the substrate facing upwards. A first curable glue is applied on the first surface. The first curable glue is pressed by a first roller with a rough circumferential surface to form a rough surface on the first curable glue. The first curable glue is cured to form a diffusion layer. The substrate is turned over to make a second surface of the substrate face upwards. A second curable glue is applied on the second surface. The second curable glue is pressed by a second roller having a micro-prism-structured circumferential surface to form a micro-prism-structured surface on the second curable glue. The second curable glue is cured to form a brightness-enhancing layer.

Abstract: An electronic writing board includes a frame including inner sides, an electronic paper, a touch panel, and a driver. The electronic paper is stretched and connected to the inner sides of the frame. The touch panel is stretched and connected to the inner sides of the frame and covers the electronic paper. The driver is in communication with the touch panel and the electronic paper. The touch panel detects positions of an object when the object touches the touch panel and thus obtaining a trajectory of the object on the touch panel, and the driver drives the electronic paper to display a writing corresponding to the trajectory in shape and position.

Abstract: An assembling system for assembling a backlight light module includes a receiving device, a pressing unit, a driving unit, an image module and a platform. The platform defines a bearing area to accommodate the receiving device. The receiving device includes a receiving room configured for receiving components of a backlight module. The pressing unit is configured for pressing the components to form the backlight module. The driving unit includes a driving device and a control unit. The driving device is used for driving the pressing unit to press the backlight module. The image module includes a camera and an image processor, the camera is configured for capturing images of the pressing unit during the pressing process, the image processor is configured for receiving and processing the images and generating a corresponding control signal, the control unit receives the control signal and control the driving device according to the control signal.

Abstract: An electronic whiteboard includes a frame comprising inner sides, an electronic paper stretched and connected to the inner sides of the frame, a number of infrared emitters positioned on the inner sides of the frame, a number of infrared receivers positioned on the inner sides of the frame, and a driver in communication with the infrared receivers and the electronic paper. Infrared light beams emitted from the infrared emitters interweave as a grid that is substantially parallel with and covers the electronic paper. Each infrared receiver receives the infrared light beam from one of the infrared emitters to detect if an object is inserted into the grid and blocks the infrared light beam to detect positions and thus a trajectory of the object in the grid. The controller drives the electronic paper to display a writing corresponding to the trajectory in shape and position.

Abstract: A light guide plate includes a light emitting surface, a bottom surface opposite to the light emitting surface, a first side surface, a second side surface, and a light incident surface. The first side surface and the second side surface connect the light emitting surface to the bottom surface. The light incident surface is connected to the light emitting surface, the bottom surface, the first side surface, and the second side surface. A plurality of V-shaped grooves is defined in the bottom surface. The V-shaped grooves form concentric arcs, sectional surfaces of the V-shaped grooves along radial directions of the concentric arcs are isosceles triangles, and a top angle of each of the isosceles triangles is equal to about 80 degrees.

Abstract: A light guide plate includes a light emitting surface, a bottom surface opposite to the light emitting surface, a first side surface, a second side surface, and a light incident surface. The first side surface and the second side surface connect the light emitting surface to the bottom surface. The light incident surface is connected to the light emitting surface, the bottom surface, the first side surface, and the second side surface. A plurality of diffusing micro-structures is formed on the light incident surface.

Abstract: An laser machining device for laser forming netted dots uses a metal grating to divide a polarized laser beam or an unpolarized laser beam into a penetrating laser beam and a reflected laser beam, and the cooperation of fixed reflecting mirrors and rotatable reflecting mirrors guides the penetrating laser beam and the reflected laser beam onto two or more predetermined positions on a workpiece.

Abstract: A lens mold includes a bottom mold and a top mold joining with the bottom mold. The bottom mold defines a first through hole. The top mold defines a second through hole. The lens mold further includes a bottom mold core and a top mold core. The bottom mold core is detachably received in the first through hole of the bottom mold. The top mold core is detachably received in the second through hole of the top mold. A plurality of microstructures is formed on a top surface of the bottom mold core near the top mold core to form a plurality of microstructures on a bottom surface of a lens formed by the lens mold. A method for manufacturing the lens with the lens mold is also provided. The lens is used as a secondary optical element for an LED.

Abstract: A detection system for detecting a distance value between a light source and a group of optical films of a back light module includes a base, a luminance detection device, a transfer device, and a distance detection device. The base is configured for supporting the light source. The luminance detection device is configured for detecting a luminance value of the light emitted from the back light module. The transfer device is configured for driving the group of optical films to move relative to the light source. The distance detection device is configured for detecting the distance between the light source and the group of optical films when a luminance value detected by the luminance detection device is equal to or larger than a provided luminance. A detection method using the above detection system is also provided.

Abstract: A measuring device is configured to measure a height of a mold. The measuring device includes a laser generator, a raster, a camera module, and a controller. The raster is positioned between the laser generator and the mold. A laser beam emitted by the laser generator is refracted by the raster to divide the laser into two laser beams. The two laser beams cooperatively define a predetermined angle ?. The camera module is configured to capture an image of the two laser beams irradiated onto the top surface. The controller is electrically connected to the camera module, and configured to receive the image and to calculate an actual distance D between the two laser beams, according to the image. The controller is capable of calculating a height H of the mold, according to D and the predetermined angle ?.

Abstract: A backlight module includes a light guide plate and a number of light sources. The light guide plate includes a frosted light incident surface, diffusion structures positioned on the frosted light incident surface, and dot-shaped micro-recesses positioned on the diffusion structures. The light sources face the frosted light incident surface.

Abstract: An LCD device includes a backlight module, a liquid crystal layer, a brightness detecting module and a control unit. The backlight module includes a light guide plate and light sources. The light guide plate includes a light-mixing part and a light-homogenized part. Protrusions are positioned on the light guide plate. A density of the protrusions in the light-mixing part is greater than that in the light-homogenized part. The liquid crystal layer includes an adjustable part corresponding to the light-mixing part and a nonadjustable part corresponding to the light-homogenized part. The brightness detecting module acquires a brightness distribution data of the liquid crystal layer. The control unit makes a brightness of the adjustable part coincide with a brightness of the nonadjustable part according to the brightness distribution data.

Abstract: A light diffusion plate includes a light-emitting region and an atomization reinforcing region connected to the light-emitting region. Light passing through the atomization reinforcing region is more greatly diffused than light passing through the light-emitting region.

Abstract: A light guide plate includes a bottom surface and a light output surface opposite to the bottom surface. A number of scattering domes are positioned on the bottom surface. A number of V-shaped micro-structures are positioned on the light output surface.

Abstract: Exemplary hot pressing equipment for forming spherical portions of light guide bodies includes a top pressing plate, a bottom pressing plate facing to the top pressing plate, a heating unit located in the top pressing plate or the bottom pressing plate to raise the temperature of the top pressing plate and the bottom pressing plate, and a cooling tube located between the top pressing plate and the bottom pressing plate. Grooves having spherical end surfaces array on the top pressing plate and the bottom pressing plate. The cooling tube delivers cooling fluid to reduce the temperature of the top pressing plate and the bottom pressing plate.

Abstract: An exemplary lens for regulating light of an LED includes a light guiding portion and a latching portion extending downwardly from the light guiding portion. The light guiding portion includes a top surface and a bottom surface opposite to the top surface. A center of the bottom surface is depressed toward the top surface to form an optical concave. The latching portion is formed at the bottom surface and located around the optical concave surface. The latching portion defines an engaging hole to fittingly receive the LED therein. A light source module having the lens is also provided.

Abstract: An LED device includes an LED chip, a fluorescent layer and a lens. The fluorescent layer has phosphor powder diffused therein. The lens covers the LED chip and is positioned between the LED chip and the fluorescent layer. Light emitting from the LED chip travels through the lens and the fluorescent layer to obtain white light. The present discloser also provides a liquid crystal display using the LED device described above.

Abstract: A backlight module includes a light guide plate and a plurality of light sources. The light guide plate includes a light incident part and a flat panel. The light incident part and the flat panel have a common bottom surface. The maximum height of the wedge-shaped light incident part is greater than a height of the flat panel. The light incident part includes a light incident surface perpendicular to the bottom surface and a sloped surface sloping relative to the light incident surface. The flat panel includes a light emitting surface opposite to the bottom surface. The light incident part further includes a reflective layer on the sloped surface. The plurality of light sources is positioned adjacent to the light incident surface.