Abstract: An embodiment of the present specification provides a method for preparing a catalyst for preparing a carbon nanotube, comprising: (a) dissolving a main catalyst precursor, a support precursor, a cocatalyst precursor and a precipitation inhibitor in a solvent to prepare a precursor solution; and (b) pyrolyzing the precursor solution by spraying the precursor solution into a reactor, wherein a mole fraction of the precipitation inhibitor to the cocatalyst precursor is 0.1 to 1.5.

Abstract: A data processing device communicating with a memory device via a memory interface includes: at least one data processor configured to generate first data; a data converter configured to generate second data written to the memory device from the first data; and a controller configured to enable the data converter to generate the second data having a size less than that of the first data to reduce power consumption in at least one of the memory device or the memory interface.

Abstract: A data processing device communicating with a memory device via a memory interface includes: at least one data processor configured to generate first data; a data converter configured to generate second data written to the memory device from the first data; and a controller configured to enable the data converter to generate the second data having a size less than that of the first data.

Abstract: The present disclosure discloses a feedback field-effect array device capable of converting between volatile and non-volatile operations and an array circuit using the same. According to one embodiment of the present disclosure, the array circuit may include a plurality of feedback field-effect array devices, wherein the source region of the feedback field-effect electronic device and the drain region of an access electronic device may be connected to each other in series, the feedback field-effect electronic device may be connected to a bit line and a first word line, the access electronic device may be connected to a source line and a second word line, and any one of first and second gate voltages may be applied to the first word line to store data in a first logic state or data in a second logic state.

Abstract: A data processing device communicating with a memory device via a memory interface includes: at least one data processor configured to generate first data; a data converter configured to generate second data written to the memory device from the first data; and a controller configured to enable the data converter to generate the second data having a size less than that of the first data to reduce power consumption in at least one of the memory device or the memory interface.

Abstract: The present disclosure discloses a feedback field-effect array device capable of converting between volatile and non-volatile operations and an array circuit using the same. According to one embodiment of the present disclosure, the array circuit may include a plurality of feedback field-effect array devices, wherein the source region of the feedback field-effect electronic device and the drain region of an access electronic device may be connected to each other in series, the feedback field-effect electronic device may be connected to a bit line and a first word line, the access electronic device may be connected to a source line and a second word line, and any one of first and second gate voltages may be applied to the first word line to store data in a first logic state or data in a second logic state.

Abstract: An AC-driven LED lighting apparatus includes: a triac dimmer to generate a modulated AC voltage by modulating a phase of AC power according to a selected level of dimming; a rectifying circuit to generate drive voltage by full-wave-rectifying the AC voltage having the phase modulated by the triac dimmer; a dimming level detector to detect a dimming level according to the drive voltage; a phase cut reference setting unit for setting a phase cut reference value; and a LED driving module for constant-current-controlling a plurality of LED groups by comparing the detected dimming level with the phase cut reference value, wherein the light emitting element driving module comprises a LED current blocking unit for blocking a drive current supplied to the plurality of LED groups when the dimming level is lower than the phase cut reference value.

Abstract: A lighting apparatus includes a light-emitting diode (LED) array, a rectifying unit configured to rectify an alternating current (AC) voltage and to generate a driving voltage for the LED array, a switch control signal generation unit configured to generate a switching control signal depending on the driving voltage, the switching control signal including connection control signals and a compensation control signal, connection changing units configured to change a connection between the LEDs according to the connection control signals, and a light output compensation unit configured to generate a compensation voltage according to the compensation control signal, and selectively supply the compensation voltage to the LED array.

Abstract: An AC-driven LED lighting apparatus includes: a triac dimmer to generate a modulated AC voltage by modulating a phase of AC power according to a selected level of dimming; a rectifying circuit to generate drive voltage by full-wave-rectifying the AC voltage having the phase modulated by the triac dimmer; a dimming level detector to detect a dimming level according to the drive voltage; a phase cut reference setting unit for setting a phase cut reference value; and a LED driving module for constant-current-controlling a plurality of LED groups by comparing the detected dimming level with the phase cut reference value, wherein the light emitting element driving module comprises a LED current blocking unit for blocking a drive current supplied to the plurality of LED groups when the dimming level is lower than the phase cut reference value.

Abstract: An LED lighting apparatus according to exemplary embodiments includes a rectification circuit configured to rectify a modulated AC voltage to generate a drive voltage, an LED driving module connected to a plurality of LED groups and configured to apply a drive current to at least one of the plurality of LED groups according to a level of the drive voltage, and a dimming level detector configured to detect a dimming level corresponding to the drive voltage. The LED driving module is configured to compare the detected dimming level to a reference value and block the drive current based on a result of the comparison.

Abstract: An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.

Abstract: An LED lighting apparatus according to exemplary embodiments includes a rectification circuit configured to rectify a modulated AC voltage to generate a drive voltage, an LED driving module connected to a plurality of LED groups and configured to apply a drive current to at least one of the plurality of LED groups according to a level of the drive voltage, and a dimming level detector configured to detect a dimming level corresponding to the drive voltage. The LED driving module is configured to compare the detected dimming level to a reference value and block the drive current based on a result of the comparison.

Abstract: A light-emitting diode (LED) driving circuit configured to drive LED units includes a rectification circuit unit to receive an alternating current (AC) power voltage and rectify the AC power voltage to output a unidirectional ripple voltage, a pulse-width modulation (PWM) signal generation unit to generate PWM decision signals. The PWM signal generation unit is configured to sequentially drive the LEDs according to the PWM decision signals.

Abstract: An exemplary embodiment discloses a light-emitting diode (LED) driving circuit including an LED driving module configured to provide a first driving voltage to an LED light emitting module including a first LED group to an n-th LED group, n is an integer which is equal to or larger than 2, and sequentially drive the first LED group to the n-th LED group depending on a voltage level of the first driving voltage and a second driving voltage providing module configured to store some of the first driving voltage and selectively provide a second driving voltage to some of the LED groups other than at least the first LED group to an m-th LED group among the LED groups in a Vfm compensation section, 1?m?n?1, according to a control of the LED driving module.

Abstract: An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.

Abstract: An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.

Abstract: A lighting apparatus includes a light-emitting diode (LED) array, a rectifying unit configured to rectify an alternating current (AC) voltage and to generate a driving voltage for the LED array, a switch control signal generation unit configured to generate a switching control signal depending on the driving voltage, the switching control signal including connection control signals and a compensation control signal, connection changing units configured to change a connection between the LEDs according to the connection control signals, and a light output compensation unit configured to generate a compensation voltage according to the compensation control signal, and selectively supply the compensation voltage to the LED array.

Abstract: A light-emitting diode (LED) driving apparatus includes a rectifying module configured to rectify an alternating current voltage and output a first driving voltage, an LED light emitting module including a first LED group, and a second LED group to an n-th LED group, and configured to receive the first driving voltage from the rectifying module, n being a positive integer of two or more, an LED driving module configured to sequentially drive the first LED group to the n-th LED group according to a voltage level of the first driving voltage, and a second driving voltage providing module connected in parallel to at least one LED group of the second LED group to the n-th LED group.

Abstract: An LED driving circuit package includes a rectification unit to receive an AC power voltage and rectify the AC power voltage to generate a ripple voltage, an LED driving switching unit including a plurality of switch units and a plurality of current control units. The LED driving circuit package further includes a low voltage control unit including a circuit power supply unit to generate low voltage power, a voltage detection unit to detect a magnitude of the ripple voltage, a reference frequency generation unit to generate a reference frequency, and a reference pulse generation unit to generate a reference pulse for controlling the operation of the LED driving switch unit according to the reference frequency and a magnitude of the voltage detected by the voltage detection unit.

Abstract: A backlight driving apparatus that drives a backlight unit having a plurality of LEDs is provided, which includes a rectifying unit rectifying an AC voltage and generating a driving voltage for the plurality of LEDs, a plurality of connection changing units changing connection relations between the plurality of LEDs depending on a level of the driving voltage, and a light output compensation unit generating a compensation voltage using the driving voltage and selectively supplying the compensation voltage to the plurality of LEDs.