Abstract: A wireless power transmission system based on cell division is provided. A communication and power control method of the wireless power transmission system, includes setting a magnetic coupling zone. The method further includes detecting a target device in the magnetic coupling zone. The method further includes transmitting a power to the target device. The method further includes adjusting an amount of the power based on a transmission efficiency of the power.

Abstract: There are provided a photoreactive copolymer and an alignment layer comprising the same, and more particularly, to a photoreactive copolymer including a copolymer of two different kinds of monomers, and an alignment layer comprising the same. The photoreactive copolymer according to the present invention may have excellent liquid crystal alignment property and alignment speed, easily change an alignment direction depending on a polarization direction, and have excellent solubility to an organic solvent, such that the photoreactive copolymer may be used in various fields such as a liquid crystal device, and the like.

Abstract: An optical film having reverse wavelength dispersion and a display device including the same are provided. The optical film according to the present invention has a thin thickness and excellent reverse wavelength dispersion, and thus it can be suitably applied to a ?/2 wave plate, a ?/4 wave plate, a protection film, and an anti-reflection film of a display device using liquid crystals or OLEDs.

Abstract: A wireless power transmission and charging system, and a power control method of the wireless power transmission and charging system are provided. The power control method may include generating charging power using the power amplifier. The charging power may be used to charge a target device. The charging power may be transmitted to the target device. The voltage supplied to the power amplifier may be adjusted based on a detected change in the current input to the power amplifier, a detected change in the temperature of the source device, a detected change in the amount of the power received to the target device, or a detected change in the temperature of the target device.

Abstract: There are provided a novel cyclic olefin compound having a photoreactive group and a photoreactive polymer. The cyclic olefin compound is applicable to various photoreactions, such as of liquid crystal alignment layers and can be preferably used as a precursor of various organic compounds or polymers.

Abstract: Provided are a method and apparatus for controlling a resonance bandwidth in a wireless power transmission system. The apparatus may include a source resonator to transfer an electromagnetic energy to a target resonator, and a source resonance bandwidth setting unit to set a resonance bandwidth of the source resonator.

Abstract: A method and apparatus to detect load fluctuation of a wireless power transmission are provided. A wireless power transmitter includes a resonator configured to wirelessly transmit, to a target device, an output power. The wireless power transmitter further includes a power detector configured to detect a current of the output power. The wireless power transmitter further includes a controller configured to detect a change in the current, and to detect a target load based on the change in the current. The target load includes a load of which the output power is applied thereto.

Abstract: A wireless power transmission device, a wireless power transmission control device, and a wireless power transmission method are provided. A coupling frequency between a source resonator and a target resonator is determined. A transmission frequency is controlled such that power is transmitted from the source resonator to the target resonator at the coupling frequency. Therefore, it is possible to maintain a high power transmission efficiency without using an additional matching circuit even when a distance between the source resonator and the target resonator is changed.

Abstract: A high efficiency variable power transmitting apparatus outputs a variable power by modulating, with respect to a time axis, a high frequency signal having a constant amplitude by turning the high frequency signal ON and OFF, amplifying the variable power to satisfy a requested power level of a target device based on a supply voltage having a predetermined level, converting an alternating current (AC) voltage received from a power source to a direct current (DC) voltage, generating the supply voltage having the predetermined level based on the DC voltage, and providing the supply voltage having the predetermined level to the PA.

Abstract: Provided is a wireless recharging set. A source unit including a source resonator may transmit power wirelessly in all directions, and a device may receive the transmitted wireless power regardless of location.

Abstract: A resonance power transmission system, and a method of controlling transmission and reception of a resonance power are provided. According to one embodiment, a method of controlling resonance power transmission in a resonance power transmitter may include: transmitting resonance power to a resonance power receiver, the resonance power having resonance frequencies which vary with respect to a plurality of time intervals; and receiving, from the resonance power receiver, information regarding the resonance frequency having the highest power transmission efficiency among the resonance frequencies used in the time intervals.

Abstract: An apparatus and method for communication using a wireless power are provided. The apparatus includes an amplifier configured to amplify an input signal based on a power supplied to the amplifier. The apparatus further includes a control unit configured to detect a change in an impedance of a target device, and to change the power based on the change in the impedance. The apparatus further includes a demodulation unit configured to receive a message from the target device, and to demodulate the message based on the changed power.

Abstract: A wireless power transmission system and a multi-mode resonator in the wireless power transmission system are provided. The multi-mode resonator includes a transmission line portion including unit-cells, the unit-cells including respective ends connected to each other, and each of the unit-cells including a capacitor, an inductor connected in parallel to the capacitor, and a via. The multi-mode resonator further includes a ground conducting portion configured to provide an electrical ground to the transmission line portion through the via of each of the unit-cells.

Abstract: Provided is a wirelessly charged robot cleaning system and a method for wirelessly charging a robot cleaner. The wirelessly charged robot may include a target resonator to receive a resonance power through energy-coupling with a source resonator of a wireless power transmitter, a wireless power receiving unit to convert the received resonance power into a rated voltage, and a battery controller to check the remaining capacity of the battery based and to charge the battery.

Abstract: The present description relates to a polymerizable liquid crystal compound, a polymerizable liquid crystal composition including the same, and an optically anisotropic body.

Abstract: A high efficiency variable power transmitting apparatus outputs a variable power by modulating, with respect to a time axis, a high frequency signal having a constant amplitude by turning the high frequency signal ON and OFF, amplifying the variable power to satisfy a requested power level of a target device based on a supply voltage having a predetermined level, converting an alternating current (AC) voltage received from a power source to a direct current (DC) voltage, generating the supply voltage having the predetermined level based on the DC voltage, and providing the supply voltage having the predetermined level to the PA.

Abstract: A detection device detecting a state of a toner image, an image forming apparatus including a detection device and method of detection are provided. The detection device includes a detector having a light window where light passes through and detecting a state of a toner image formed on an image bearing member via the light window, and a cleaner removing a pollutant attached to a surface of the light window. The cleaner includes an adsorption unit formed of a conductive material and reciprocating while being in contact with the surface of the light window and a voltage applying unit applying a voltage for adsorbing the pollutant to the adsorption unit.

Abstract: A resonance power transmission system, and a method of controlling transmission and reception of a resonance power are provided. According to one embodiment, a method of controlling resonance power transmission in a resonance power transmitter may include: transmitting resonance power to a resonance power receiver, the resonance power having resonance frequencies which vary with respect to a plurality of time intervals; and receiving, from the resonance power receiver, information regarding the resonance frequency having the highest power transmission efficiency among the resonance frequencies used in the time intervals.

Abstract: The present description relates to a polymerizable liquid crystal compound, a polymerizable liquid crystal composition including the same, and an optically anisotropic body.

Abstract: A communication apparatus in a wireless power transmission system includes an operating mode converter configured to switch an operating mode of the communication apparatus between a transmitting mode and a receiving mode according to a predetermined timing; and a transmitting unit configured to transmit state information of a channel occupied by a source including the communication apparatus using a continuous wave signal while the communication apparatus is operating in the transmitting mode irrespective of whether the communication apparatus is performing communication via the occupied channel. The source including the communication apparatus is configured to transmit wireless power. The occupied channel has been assigned to the source including the communication apparatus from a plurality of channels available in a communication cell for assignment to a plurality of sources each configured to transmit wireless power.