32results about How to "Reduce the number of light sources" patented technology

Provided is a liquid crystal display device (1), including: a liquid crystal panel (2); and a backlight unit (4), which is disposed on a rear surface of the liquid crystal panel (2) and includes a light source substrate (42) onto which a plurality of light sources are mounted and a casing (49), in which: the plurality of light sources are arranged along one direction, and at least one of the plurality of light sources is disposed so as to be offset in a direction orthogonal to the one direction with respect to at least another one of the plurality of light sources; and the backlight unit further includes a fixture (50) for fixing the light source substrate (42) onto the casing (49), the fixture being disposed on a side of the offset light source in an opposite direction to an offset direction.

The invention discloses a decorative wallboard and a decorative wall, which include a light source device and a wallboard body. There are three light-through holes, and a light-transmitting sheet and an adjustable light-shielding sheet are respectively arranged in the three light-through holes. The colors of the three light-transmitting sheets in each optical fiber interface are red, green, and blue. The main body includes the upper layer of the wallboard and the lower layer of the wallboard. Several fiber bundles are arranged between the upper layer of the wallboard and the lower layer of the wallboard. There are three optical fibers in each fiber bundle. The light outlet of the fiber bundle faces the upper layer of the wallboard. There is a transparent protective layer, and the light entrance of the fiber bundle is connected with the fiber interface. The present invention realizes the flexible change of light color and brightness through the perfect combination of the light source device and the wallboard body, and by arranging light-transmitting sheets and light-shielding sheets in the light source device, so that different patterns can be displayed on the wall.

The invention discloses a coherent passive optical network system and signal transmitting and receiving method, and relates to an optical access network. The method includes the following steps that in the downlink direction, k multi-carrier signal transmitting-receiving devices in an OLT have high-speed DACs, each multi-carrier signal transmitting-receiving device generates N downlink digital signals in a digital method, the k multi-carrier signal transmitting-receiving devices and a wavelength division multiplexing and demultiplexer of one k path are combined to generate dense or super-dense wavelength division multiplexing signals, the dense or super-dense wavelength division multiplexing signals are selective received by a coherent ONU after passing a power distributor, and the coherent ONU achieves selection of channels by adjusting LO wavelength in coherent detection. The coherent passive optical network system is low in cost, simple in structure, high in sensitivity and suitable for a super-dense wavelength division multiplexing network.

The invention relates to a side-entry quantum dot backlight module structure, which includes two excitation light sources provided with reflectors, an optical path conversion device and a quantum dot light guide plate, and the excitation light sources are respectively located on the left and right sides of the optical path conversion device , the optical path conversion device is located on the side of the quantum dot light guide plate, and the light incident side of the quantum dot light guide plate has a quantum dot layer; a part of the light emitted by the excitation light source is incident on the quantum dot light guide plate after being reflected by the optical path conversion device , after the color conversion of the quantum dot layer and the modulation of the quantum dot light guide plate, the light is emitted, and the other part of the light that is directed to the reflector after passing through the optical path conversion device is incident on the quantum dot again after being reflected by the reflector and the action of the optical path conversion device. Reuse in the light guide plate. This structure can not only effectively reduce the influence of light radiation and light source heat on the quantum dots, improve the service life of the backlight module, but also greatly reduce the number of light sources used in the backlight module and reduce production line costs.

The invention discloses a method for extending focal depth, including that: Bessel-Gauss radial polarized light passes through an annular diaphragm, so as to modulate amplitude and split the light into two light beams; one light beam is subject to 0-Phi phase coding and then are incident into the same optical beam combining device with the other light beam after optical reflex, so as to form a combined coaxial light beam, and then lens focusing is carried out, thus obtaining the extended focal depth spot. The invention also discloses a device for extending focal depth, comprising a light source generating Bessel-Gauss radial polarized light, an annular diaphragm, a beam splitter, a 0 / Phi phase plate, an optical reflex device, an optical beam combining device and an apochromatism focusing lens. In the method and device, Bessel-Gauss laser is taken as a work light beam, the focal depth of extended focal spot is more than 8lambda, the focal spot can be less than diffraction limit of system, and light distribution after extending is more uniform, thus being more beneficial to practical application.