Jung Hyun Kim, Gyeonggi-Do KR
Jung Hyun Kim, Gyeonggi-Do KR
|Patent application number
|DEVICE FOR CONTROLLING CURRENT OF LED - Disclosed herein is a device for controlling current of an LED including a constant current generator, a current mirror, and a current amplifier, the device controlling current of an LED, comprising: a selector outputting an L signal or an H signal according to an input control signal; and a current changing unit formed by connecting at least one switching unit in parallel, the switching unit including a transistor and a switch connected to the transistor in series. The device for controlling current of an LED adjusts current supplied to the current amplifier using a SEL input without an effect of a noise, thereby making it possible to change the current of the LED without separately changing a resistor.
|DEVICE AND METHOD FOR GENERATING THREE MODE SIGNAL - The device for generating three mode signals includes: a voltage setting block including an input terminal receiving three input signals of driving voltage, open, and ground and setting three voltages according to the three input signals; and an output block including two output terminals and a second node B receiving the three voltages from the voltage setting block, and outputting three combined signals by comparing an input voltage with a reference voltage, whereby only a small number of resistors and amplifiers generates three mode signals to further reduce the chip size than the related art and the external power source is not required to solve the problems of the related art due to noise.
|PULSE SIGNAL GENERATION CIRCUIT AND METHOD FOR OPERATING THE SAME - A pulse signal generation circuit includes a transfer path configured to receives and transfer a first pulse signal, a pulse adjustment unit configured to adjust a pulse width of the first pulse signal by applying charges to the transfer path in response to a control signal, and a pulse output unit configured to output a second pulse signal of the adjusted pulse width in response to an output of the transfer path.
|LED DRIVING DEVICE - Disclosed herein is a light emitting diode (LED) driving device for driving a multi-channel LED element or an LED array for each channel, the LED driving device including: a constant current driver driving currents flowing in each channel; a first switching unit selectively feeding-back voltage levels of each channel; and a switching controller controlling the turn on/off of the first switching unit, wherein matching characteristics of currents flowing in each channel is improved and a size of an integrated circuit (IC) chip is also reduced as compared to a case according to the related art, thereby making it possible to reduce a production cost and satisfy the trend of miniaturization of the chip, while solving a performance deterioration problem due to degradation of the matching of the currents between the channels.
|LED DRIVING DEVICE - Disclosed herein is a light emitting diode (LED) driving device for driving a multi-channel LED element or an LED array for each channel, the LED driving device including: a constant current driver driving currents flowing in each channel; and a minimum voltage selector receiving voltage levels of each channel and selecting a minimum voltage level to thereby feedback the selected minimum voltage level to the constant current driver, wherein matching characteristics of currents flowing in each channel is improved and a size of an integrated circuit (IC) chip is also reduced as compared to a case according to the related art, thereby making it possible to reduce a production cost and satisfy the trend of miniaturization of the chip, while solving a performance deterioration problem due to deterioration of the matching of the currents between the channels.
|POWER SUPPLY APPARATUS - The present invention relates to a power supply apparatus including: a converting unit for converting an applied voltage into a predetermined level; a switching unit opened or closed to control current flowing in the converting unit; a detecting unit for detecting occurrence of overcurrent when a voltage applied to the switching unit is higher than a preset reference voltage; and a control unit for performing a protection operation when the overcurrent is detected more than a predetermined number of times within a predetermined time from when the overcurrent is detected and can prevent malfunction due to noises.
|PULSE SIGNAL GENERATION CIRCUIT AND OPERATING METHOD THEREOF - The present invention relates to a pulse signal generation circuit for changing a pulse width of an input pulse signal and outputting an output pulse signal having the changed pulse width. In an aspect, the pulse signal generation circuit may include a control signal generator configured to generate at least one control signal according to a pulse width of a input pulse signal and a pulse signal generator configured to control a pulse width of an input pulse signal in response to a control signal and to generate an output pulse signal with the controlled pulse width. The control signal controls the pulse width of the output pulse signal.
|KEY INPUT METHOD AND APPARATUS USING RANDOM NUMBER IN VIRTUAL KEYBOARD - A method and an apparatus for key input by using a random number in a virtual keyboard in a portable terminal are provided. The method includes sending, to a server, a request for random number generation; receiving a random number generated in response to the request; displaying a virtual keyboard that activates keys corresponding to the received random number; and receiving, through the displayed virtual keyboard, an input of keys.
|SEMICONDUCTOR SYSTEM AND SEMICONDUCTOR PACKAGE - A semiconductor system includes a plurality of memory chips. Each of the memory chips includes an oscillator suitable for generating a periodic wave in a self refresh mode, and a delay unit suitable for delaying the periodic wave to generate a refresh pulse and for setting a delay value based on a corresponding chip identification.
|SEMICONDUCTOR MEMORY DEVICE AND MEMORY SYSTEM INCLUDING THE SAME - A semiconductor memory device includes a plurality of word lines each of which are connected to a plurality of memory cells, a row control unit suitable for sequentially activating and precharging a word line corresponding to a target address and a predetermined (N) number of adjacent word lines during a target activation mode, and a mode exit control unit suitable for counting the number of activation operations by the row control unit during the target activation mode to determine whether or not to exit from the target activation mode.
Patent applications by Jung Hyun Kim, Gyeonggi-Do KR