摘要:
An LED driving circuit of a backlight unit includes a switch connected between an input of direct voltage and a ground to switch the direct voltage according to a switching pulse; a rectifying diode connected between a connecting node and one terminal of the LED array to rectify driving voltage supplied according to switching operation of the switch; a smoothing capacitor having one terminal connected to a cathode of the rectifying diode and the other terminal connected to a ground; a voltage detecting resistor connected between the other terminal of the LED array connected to the ground and the other end of the smoothing capacitor to detect voltage from the current flowing to the ground; and a PWM controlling part for controlling on/off status of the switching according to the switching pulse, wherein the switching pulse has a duty ratio determined according to a preset internal reference voltage and the voltage detected by the voltage detecting resistor. The driving current of can be controlled at a constant current and thus be stabilized.
摘要:
Disclosed is a method for estimating the maximum power of a battery, which can inexpensively perform an estimation of the maximum power of a battery in a relatively simple manner of using the internal resistance of the battery, which has a correlation with and a largest effect on the maximum power of the battery. The method includes the steps of: measuring an internal resistance and a temperature of the battery and estimating a state of charge, if an estimation of the maximum power of the battery is requested; and reading a value of the maximum power of the battery, which corresponds to the measured temperature, the estimated state of charge, and the measured internal resistance, from a table in which the internal resistances and the maximum powers of the battery are mapped according to the temperatures and states of charge.
摘要:
Disclosed is an apparatus and method for controlling the discharge or charge power of a battery, capable of preventing over-charge and over-discharge of battery cells according to states of the battery cells, and solving a problem that the lifetime of a conventional battery pack is rapidly reduced due to the over-charge or over-discharge of some cells of the battery pack. The method includes the steps of estimating the maximum power of the battery, measuring voltage of a battery cell or pack, checking whether or not the voltage of the battery cell or pack deviates from a preset limited range so as to correspond to the maximum power, and when the voltage of the battery cell or pack deviates from a preset limited range, controlling the discharge or charge power of the battery.
摘要:
A liquid crystal display device and a fabricating method thereof for driving the liquid crystal display device using a magnetic field are disclosed. In the device and method, a current is applied to a first electrode in a first direction, and a current is applied to a second electrode in a second direction. A liquid crystal layer is driven with a magnetic field induced by the currents from the first and second electrodes modulating a light.
摘要:
A method for forming CNT multilayer film patterns, which comprises repeatedly attaching CNTs having exposed carboxyl groups onto a substrate having exposed amine groups by amide linkage, so as to form a CNT multilayer film, and then forming CNT multilayer film patterns from the CNT multilayer film by photolithography and dry etching. Also disclosed is a method for fabricating CNT multilayer film patterns where a variety of chemical functional groups are exposed, by thermally treating CNT multilayer film patterns obtained as provided in the preceding sentence, to obtain CNT multilayer film patterns devoid of surface defect sites, followed by physically attaching either surfactants or chemical substances having sites capable of π-stacking, to the CNT multilayer film patterns devoid of defect sites. Such methodology allows fabrication of clear CNT multilayer film patterns in which CNTs are attached only at selected regions, resolving prior art issues of CNTs being attached also at non-selected regions. CNT multilayer film patterns having chemical functional groups physically attached thereto and exposed to the surface, are useful in the fabrication of biosensors.
摘要:
Provided are a transcoding apparatus and method. A frame comparator compares the length of input frames of a transmitting side with the length of output frames of a receiving side. A frame deciding unit decides more than one input frame corresponding to one output frame on the basis of the comparison result and decides the type of the output frame based on the type of the corresponding input frame. A frame converter converts the format of the input frames to the format of the output frames on the basis of the decided type. Accordingly, a frame coded by a voice coder using VAD is easily transformed to the format of another voice coder.
摘要:
A liquid crystal display (LCD) device is disclosed, which obtains a high aperture ratio and a wide viewing angle. The LCD device includes first and second substrates; a plurality of gate and data lines on the first substrate to define a plurality of pixel regions; a pixel electrode in each pixel region; a common electrode on the second substrate, the common electrode having an electric field inducing window dividing each pixel region into at least two domains; an auxiliary electrode on the first substrate, the auxiliary electrode corresponding to the periphery of the pixel electrode in one of at least two domains; and a liquid crystal layer between the first and second substrates.
摘要:
Provided are a packet processing apparatus and method used when an output bitstream of an embedded codec is divided into a plurality of packets and transmitted accordingly, and more particularly, an efficient packet processing apparatus and method which can reduce deterioration of sound quality which may occur when a packet required for the reproduction of a voice signal is not received due to different arrival times of a plurality of packets at a receiving end if an output bitstream of an embedded codec is divided into the packets and transmitted accordingly through a path or a plurality of paths. In particular, an apparatus for processing packets of an embedded codec is provided. The apparatus includes a packet reception unit receiving packets, a layer information unit identifying layer information from received packets, a bitstream determination unit using the received packets, and a bitstream generation unit generating a new bitstream. The apparatus is used to provide a voice and multimedia service using an embedded codec in a packet network.
摘要:
A transmission apparatus having a plurality of network interfaces and a transmission method using a plurality of the network interfaces are provided. The transmission apparatus includes: a session information extraction unit which extracts session information of an IP packet; a network interface determination unit which determines a network interface associated with session information of the IP packet based on a table for mapping sessions to the network interfaces according to available bandwidths of the network interfaces; and a traffic distribution unit which transmits the IP packet to the determined network interface. Accordingly, traffic is distributed over a plurality of network interfaces, so that optimal communication performance can be ensured in a simultaneous multiple-mode connection environment, and network resources can be efficiently utilized.
摘要:
Provided is a method for reducing a transmission delay on the basis of non-contention without performing backoff and polling when transmitting an audio frame of a radio frequency (RF) link section in a voice-over Internet protocol (VoIP) system having a wireless local area network (WLAN) function. The method includes the steps of: (a) obtaining audio information through at least one WLAN terminal; (b) performing one of setting, change and removal of a reservation number (RN) through an RN setting process between the WLAN terminal and an access point (AP); (c) transmitting an audio QoS frame including reservation information obtained by step (b) at every interval when an audio frame is generated in a radio frequency (RF) link section; and (d) setting up a reservation time on the basis of the reservation information included in the received audio QoS frame.