Abstract: A surface light source unit, a liquid crystal display apparatus, and a method for reducing snaking and vibration of the positive column caused in the surface light source unit are provided. The surface light source unit includes at least one discharge space for emitting light, a first electrode positioned a distance apart from the center of one side of the discharge space for emitting current, and a second electrode positioned at a distance apart from the center of the other side of the discharge space for receiving the current emitted from the first electrode. The first electrode and the second electrode disposed at both sides of the discharge space arranged on the upper side of the surface light source unit are positioned at the upper side of the center of the discharge space. The first electrode and the second electrode positioned at both sides of the discharge space arranged on the lower side of the surface light source unit are positioned apart from the center of the discharge space.

Abstract: The present invention relates to a slurry for use in metal chemical-mechanical polishing (CMP) and a preparation method thereof. More particularly, the invention relates to a slurry for use in metal CMP, in which iron ions or divalent or higher valent metal ions are physico-chemically adsorbed on colloidal silica particles in the form of particles by a reduction, hydrolysis, impregnation or precipitation method, as well as a preparation method thereof. The slurry useful for metal CMP prepared according to the present invention has a uniform particle size distribution, and shows increased efficiencies as an oxidation catalyst and polishing slurry chemically adsorbed with metal particles, as compared to the prior metal CMP slurry distributed with metal ions. Also, the inventive slurry has long-term storage stability, since it does not show coagulation and precipitation phenomena even after it is stored for more than one year without a dispersant or a dispersion stabilizer.

Abstract: The present invention relates to a liquid crystal display (LCD) apparatus, comprising a top chassis; a display panel provided in rear of the top chassis; a lamp provided in rear of the top chassis driven by parallel electrode power; and a bottom chassis provided in rear of the lamp formed with current leakage preventing holes to reduce the leakage current from the lamp as much as possible. Thus, the present invention provides a liquid crystal display apparatus capable of reducing leakage current generated between a lamp and a bottom chassis as much as possible.

Abstract: A hybrid circuit board includes a first circuit board and a second circuit boards. The first circuit board includes a first body having a slot, and a first circuit pattern formed on the first body and extended to the slot. The second circuit board includes a second body, a protruding portion, a second circuit pattern, and a separating member. The protruding portion extends from the second body. The protruding portion is inserted into the slot of the first circuit board to combine the second circuit board to the first circuit board. The second circuit pattern is formed on the second body to be extended to the protruding portion, so that the second circuit pattern is electrically connected to the first circuit pattern of the first circuit board. The separating member is disposed between the second body and the protruding portion to separate the protruding portion from the second body.

Abstract: In a backlight assembly and an LCD device having the same, a backlight assembly includes a main light source and an auxiliary light source. The main light source is under an LCD panel that displays an image. The main light source generates a main light. The auxiliary light source generates an auxiliary light. Therefore, luminance of the backlight assembly becomes more uniform, and an image display quality of the LCD device is improved.

Abstract: A surface light source unit and an LCD device having the same having an improved structure to minimize a dark portion caused by an outer electrode portion. The surface light source unit of the LCD device includes a discharge portion formed between a first substrate and a second substrate disposed opposite to the first substrate, a first outer electrode portion disposed on the first substrate inside the discharge portion to be supplied with power, a first frit disposed on the first substrate inside the discharge portion opposite the first outer electrode portion. The discharge portion performs a discharge according to the power supplied to the first outer electrode portion. Since the first frit increases the number of secondary emitting electrons, the dark portion can be minimized.

Abstract: A surface light source unit of a liquid crystal display device that is capable of preventing occurrence of a dark area caused by external electrode elements. The surface light source unit of a liquid crystal display unit comprises a surface light source body having a plurality of discharge sections which are divided into first regions where the discharge sections are shaded by a support frame, and a second region where the discharge sections are exposed without being shaded by the support frame, and first external electrode elements provided on the surface light source body to correspond to the first regions that cover an area of the plurality of discharge sections that is smaller than the first regions. As a result, luminance of light projected from the surface light source unit can be uniformly controlled, and a display quality can be enhanced.

Abstract: Disclosed is a multicarrier-based wireless communication system including a base station for providing a multiple access service to terminals which filter multitone transmitting signals through filters and transmit the filtered signals. A transmitter of the respective terminals includes a multiplexer for multiplexing an input signal and outputting the signal as a plurality of transmitting signals, at least one filter bank for filtering the plurality of transmitting signals, an inverse fast Fourier transformer for executing inverse fast Fourier transform of the filtered transmitting signals output from the filter bank, and a filter information generator for providing filter information to the filter bank. Since the transmitter of the present invention distinguishes users from each other by a filter and thus no synchronization is required between users, which causes a problem in an uplink of the multicarrier-based wireless communication system, system performance can be expected to be improved.

Abstract: A receiving apparatus in an OFDM communication system, in which the receiving apparatus includes a serial-to-parallel converter that converts a serial signal received through an antenna to parallel signals. A pre-processor processes an nth symbol converted in the serial-to-parallel converter using an (n?1)th symbol and an (n+1)th symbol. A Fourier transformer Fourier-transforms the output of the pre-processor and an equalizer equalizes a Fourier-transformed signal. A deinterleaver deinterleaves an equalized signal, a decoder decodes a deinterleaved signal, and a parallel-to-serial converter converts parallel decoded signal to a signal stream.

Abstract: Disclosed is an inverter power module for use in the electric and electronic product, which includes: first elements constituting a power block; second elements constituting an inverter block; a mainboard on which the first elements are arranged; and a sub-board on which the second elements are arranged and mounted on the mainboard. On one portion in the front side of the main board, a sub-board mounting part for mounting the sub-board is provided. The sub-board mounting part has at least one connector and the sub-board has a pin header that corresponds to the connector. With these components, the sub-board is DIP-mounted on the mainboard. According to such construction, a plurality of the second elements having high probability of defect are included in the sub-board and mounted on the mainboard, whereby improvement in productivity and increase in yield are expected and defect generation can be minimized.

Abstract: A mobile communication system, a transmitter includes a first transmission antenna and a second transmission antenna, and the first and second transmission antennas transmit signals through at least one odd carrier and at least one even carrier. The transmitter determines a first symbol and a second symbol to be used for initial channel estimation of a receiver, encodes the first symbol and the second symbol by a preset transmit diversity scheme for a preset time, and transmits the encoded first and second symbols to the receiver through odd carriers and even carriers of the first transmission antenna and the second transmission antenna.

Abstract: A preprocessing apparatus and method for a transmitter and a receiver to prevent system performance degradation caused by Inter-Channel Interference (ICI) or inter-symbol interference (ISI) in an OFDM system. In the OFDM system using N carriers having different frequency bands and K carriers of the N carriers designated as redundant carriers, the transmitter renders ICI-causing parts to be zeroes in a data frame, when a cyclic prefix is not longer than a channel impulse response. Therefore, the ICI is prevented. The receiver eliminates the ISI involved in a current frame using an interference estimated from a previous data frame. Therefore, noise spread caused by the use of redundant carriers is prevented and system complexity is remarkably reduced.

Abstract: A power supply circuit for a video display device including a power transformer for inducing a voltage with respect to an input voltage by using an interaction occurring between a primary coil and a secondary coil; a switching circuit unit for controlling the voltage to be induced at the secondary coil of the power transformer by switching on/off a current flowing along the primary coil of the power transformer; first and second TVS diodes serially connected to each other; first and second resistors parallel connected to the respective first and second TVS diodes; a capacitor parallel connected to both ends of the first and second TVS diodes connected to each other and being charged with the transient voltage in the reverse direction that is supplied through the primary coil of the power transformer; and a diode for forming a passage of current in one direction when the capacitor is charged.

Abstract: Disclosed is power supply device and method having a spark prevention function. The power supply device having a spark prevention function includes output connectors to which an external device is coupled to be supplied with electric power; and an output controller for controlling a level of a voltage outputted to the output connectors depending upon whether the external device is coupled to the output connectors. Accordingly, damages to parts and malfunctions due to spark occurrences can be prevented, so an external device can be coupled to a power supply device in operation without any damage.

Abstract: An apparatus for fixing a bobbin to a printed circuit board for use in a transformer includes a receiving hole formed in the printed circuit board, a size of which is minutely larger than that of the bobbin to hold the bobbin, and a horizontal support portion formed at the pins of the bobbin in parallel relation to an upper surface of the printed circuit board, for allowing the bobbin to be supported on the upper surface of the printed circuit board when the bobbin is inserted into the receiving hole. Accordingly, the apparatus for fixing the bobbin to the printed circuit board for use in the transformer can make the installation height of the transformer installed on the printed circuit board slim, thereby decreasing a thickness of the electronic product employing the transformer 10 and thus improving convenience in use.

Abstract: A power supply circuit for a video display device including a power transformer for inducing a voltage with respect to an input voltage by using an interaction occurring between a primary coil and a secondary coil; a switching circuit unit for controlling the voltage to be induced at the secondary coil of the power transformer by switching on/off a current flowing along the primary coil of the power transformer; first and second TVS diodes serially connected to each other; first and second resistors parallel connected to the respective first and second TVS diodes; a capacitor parallel connected to both ends of the first and second TVS diodes connected to each other and being charged with the transient voltage in the reverse direction that is supplied through the primary coil of the power transformer; and a diode for forming a passage of current in one direction when the capacitor is charged.

Abstract: A power saving circuit of an AC/DC adaptor for a portable computer including an input until converting an AC voltage into a DC voltage; a power transistor; a transformer inputting the DC voltage and inducing an AC voltage based on the state of the power transistor; an output unit converting the AC voltage into a DC voltage; a feedback unit producing a feedback voltage based on an output voltage of the output unit; a driver outputting a PWM control signal to the power transistor based on the feedback voltage; an output load sensor outputting a sensing signal if a sensed load of the output unit is below a predetermined level; an output voltage dropping unit dropping an output voltage of the output unit based on the sensed signal; and a switching frequency reducer reducing a switching frequency of the PWM control signal based on the sensing signal.