Abstract:
A cascode-type current mode comparator, a receiving circuit having the same, and a semiconductor device having the same are provided to reduce an error rate of a receiving signal by improving an SNR(Signal-to-noise ratio). A receiving circuit(200) having a cascode-type current mode comparator includes a CMOS(Complementary Metal-Oxide Semiconductor) logic unit, first and second main transistors(MN,MP), a first cascode current source(Mpc), and a second cascode current source(Mnc). The CMOS logic unit converts the voltage of a voltage sensing node reflecting the difference between a standard electric current and a data electric current into an output signal of a CMOS level by being connected to the voltage sensing node. The first and second main transistors(MN,MP) are connected to the voltage sensing node and are turned on and off on the basis of the output signal. The first cascode current source(Mpc) supplies a first electric current from a first power to the voltage sensing node by being connected to a cascode of the first main transistor(MN). The second cascode current source(Mnc) supplies a second electric current from a second power to the voltage sensing node by being connected to a cascode of the second main transistor(MP).
Abstract:
A data driving unit and a liquid crystal display including of the same are provided to prevent malfunction of the liquid crystal display by pre-charging and pre-discharging the data signal from the data driver selectively. In a data driving unit and a liquid crystal display including of the same, a charge sharing] switch(430) is connected with an output terminal of a first buffer(410) and the output of a second buffer(420). A controller(440) compares a previous line time data pattern and a current line time data pattern, and the controller outputs a control signal for controlling a switching operation of the charge sharing switch according to a comparison result.
Abstract:
데이터 전송 장치는 데이터를 송신하는 송신 칩, 복수개의 수신 칩들 및 한 쌍의 전송 라인들을 포함한다. 복수개의 수신칩들은 송신 칩으로부터 송신되는 데이터를 수신하고 데이터가 수신되는 수신칩에서만 종단 저항을 제공한다. 한 쌍의 전송 라인들은 상기 데이터를 상기 송신 칩으로부터 상기 복수개의 수신칩들로 전달하고 데이지 체인 형태의 구조를 갖는다.
Abstract:
A deskew system for removing a skew between data signals and a clock and circuits for the same are provided to reduce power consumption and a chip area by reducing the number of clocks for data sampling. A first voltage control delay line(110) receives a data signal and generates the delayed data signals of N by delaying the phase of data signal in response to a phase control signal to 90/N unit. The N is the natural number more than 1. A second voltage control delay line(120) receives a clock and generates the delayed clocks of N by delaying the phase of the clock in response to the phase control signal to 90/N unit. A skew correction control unit(140) generates a plurality of skew control signals for correcting the skew between the data signal and the clock based on the delayed clocks of N, the delayed data signals of N, the clock, and the data signals.
Abstract:
A data transmission device and a method thereof are provided to reduce the number of transmission lines and the area of a PCB by improving an operation speed. A data transmission device comprises the followings: a transmission chip(310) transmitting data; a plurality of receiving chips(340,350,360) which receives the data transmitted from the transmission chip and provides termination resistance; and a pair of transmission lines(330) of a daisy chain type which transmits the data to the receiving chips from the transmission chip. Each receiving chip comprises a pair of input lines(342,352,362) branched from the transmission lines, termination resistance providing units(344,354,364) are connected between the input lines, buffers receiving data from the input lines, and connection switches(348,358,368) connecting the receiving chips with each other.
Abstract:
An LCD(Liquid Crystal Display) and an image quality improving method thereof are provided to apply constant power/ground voltage to a source driver regardless of a location of the source driver, thereby reducing a deviation of rising and falling time of an output signal outputted from the source driver. A timing controller(400) generates plural gamma reference voltages by dividing power voltage inputted from a power unit. Regulators(410,420) generate second voltage as output voltage from first voltage as input voltage by using the gamma reference voltages as inner reference voltage. A source driver(430) uses the second voltage as inner bias voltage.
Abstract:
A semiconductor integrated circuit is provided to test a chip which operates in a current mode, using an external test device which operates in a voltage mode. A current mode semiconductor integrated circuit operates in a voltage mode in a test mode. The semiconductor integrated circuit includes a first transmission converter(605), a first reception converter(610), and a first output unit(605-2). The first transmission converter receives a first test voltage and converts the first test voltage to a first test current. The first reception converter receives the first test current and a reference current and generates a first output voltage based on the first test current and the reference current. The first output unit outputs the first output voltage to the outside. The semiconductor integrated circuit also includes a test voltage input terminal, which receives the first test voltage, and a current signal input terminal which receives data current and the reference current.
Abstract:
디스큐 시스템이 개시된다. 상기 디스큐 시스템은 데이터 신호를 수신하고, 위상 제어 신호에 응답하여 상기 데이터 신호의 위상을 90/N(N은 1이상의 자연수) 단위로 지연시킨 N개의 지연된 데이터 신호들을 발생하며, 상기 데이터 신호와 상기 N개의 지연된 데이터 신호들을 출력하는 제1전압 제어 지연 라인, 클락을 수신하고, 상기 위상 제어 신호에 응답하여 상기 클락의 위상을 90/N 단위로 지연시킨 N개의 지연된 클락들을 발생하며, 상기 클락과 상기 N개의 지연된 클락들을 출력하는 제2전압 제어 지연 라인, 및 상기 데이터 신호, 상기 N개의 지연된 데이터 신호들, 상기 클락, 및 상기 N개의 지연된 클락들에 기초하여 상기 데이터 신호와 상기 클락 사이의 스큐를 보상하기 위한 다수의 스큐 제어 신호들을 발생하는 스큐 보상 제어 유닛를 포함한다. 스큐(skew), 디스큐(deskew)
Abstract:
A source driver for decreasing the slew rate of output signal and a display device comprising a source driver are provided to reduce the slew rate deviation of data signal according to the location of an plurality of source drivers included in data driver. In a source driver for decreasing the slew rate of output signal and a display device comprising a source driver, an output buffer(143) and a power supply circuits(141, 142) are included the in the source driver. The output buffer is formed as a group composed of a plurality of output buffers outputs data signal. A power voltage supply circuit supplies a plurality of power voltages from the output buffer at the center to the output buffer at the edge.
Abstract:
An apparatus and a method for driving a display panel are provided to reduce chip size of a source driver by changing bus configuration between a timing controller and a source driver block. An apparatus for driving a display panel includes a timing controller(220), plural source drivers(250-1,250-2,250-3), first signal transmitters(260-1,-,260-10), and second signal transmitters(270-1,270-2). The timing controller generates signals required for driving a display panel including data and reference signals based on a display drive timing. The source drivers generate signals for driving data lines of the display panel using the signals. The first signal transmitters include buses, which are used for transmitting data between the timing controller and the source drivers, and transmission buses which are used for transmitting the reference signal from the timing controller to one of source drivers. The second signal transmitters include buses which are used for transmitting the reference signal according to a serial cascade connection structure between the source drivers.