Abstract:
PURPOSE: A current reference circuit is provided to reduce power consumption and an occupied area. CONSTITUTION: An absolute temperature proportion current generator(110) generates an absolute temperature proportion current. A band gap reference circuit(130) generates a reference voltage based on the absolute temperature proportion current. A band gap reference circuit removes a first current and a second current. A current replication circuit(150) replicates the first current.
Abstract:
PURPOSE: A touch data processing circuit, a display driving circuit, and a display device having the same are provided to improve sensing sensitivity by minimizing the influence of noise. CONSTITUTION: A voltage reading circuit(20) reads out a first voltage outputted from plural sensing units connected to sensing lines, and an amplifying circuit(30) attenuates the effects, which are caused by a capacitance component of the sensing unit, from the first voltage read out from the voltage reading circuit. The amplifying circuit amplifies the first voltage attenuating the effects and outputs the second voltage. An integrating circuit(40) integrates the second voltage outputted form the amplifying circuit.
Abstract:
PURPOSE: A charge pump circuit and a voltage conversion device thereof are provided to generate a voltage which is required in a semiconductor IC by generating a stable boosting voltage by using an external power voltage and a reference voltage. CONSTITUTION: A first circuit block(510) includes a plurality of switches(SW1,SW3,SW4) and a capacitor(Cs). A capacitor is connected between a first node(Node1) and a second node(Node2). A second circuit block(520) includes a plurality of switches(SW5~SW7), a capacitor(C1), a comparator(CP1), a NAND gate operator(G1), and a transistor(PM1). A capacitor is connected between a third node(Node3) and a fourth node.
Abstract:
PURPOSE: A signal processing device is provided to generate a uniform oscillation signal by generating bias voltages after tracking temperature variation and controlling the bias current of an internal circuit according to the bias voltages. CONSTITUTION: A current bias circuit(110) generates bias voltages for supplying a bias current regardless of temperature variation by tracking temperature variation based on a control voltage which is outputted from a band gap reference circuit. A ring oscillator(120) compares differential output signals which are generated according to the bias voltages and generates an oscillation signal as the comparison result.
Abstract:
PURPOSE: A display driving circuit and the display device having the same are provided to improve the sensing sensitivity of a touch screen by reducing the parasitic capacitance and the interference of noise from the sensing unit. CONSTITUTION: A touch data generating unit(112) is connected to a plurality of sensing lines. The touch data generating unit senses the capacitance change of the sensing unit. The touch data generating unit process a sensing data and generates touch data. A signal processor(111) receives at least on timing information. The signal processor supplies one of timing information to the touch data generating unit in response to the timing information. The signal processor controls the generating timing of touch data.
Abstract:
PURPOSE: A gate driver, gate driving method and display panel driving apparatus using the same are provided to delete the capacitor for precharging in the gate driving circuit. CONSTITUTION: The decoder(210) decodes the gate line selecting data. The gate line selecting signal is created. According to the control signal for the gate line selection signal and precharging, the gate driving circuit(230) creates the gate driving signal. For the interval which the gate line is not selected, the gate driving circuit uses the hold signal which is generated based on the occurrence timing of the control signal for precharging and gate line selection signal. The target voltage level is hold.
Abstract:
PURPOSE: A level shifting circuit, driving voltage generation circuit and liquid crystal display device are provided to reduce power consumption. CONSTITUTION: The input unit(10) receives a message the first voltage level and the second voltage level interval input signal. The pulldown driver(20) pulls down the second node to the first voltage level. According to the voltage of the voltage of the first node and the second Node, the level converter(30) provides the first intermediate voltage signal and the second intermediate voltage signal. The output unit(40) secludes the leakage current with the voltage levels of the second intermediate voltage signal and the first intermediate voltage signal.
Abstract:
PURPOSE: A display device and a control method thereof are provided to reduce a moving picture spot and a flicker by forming a second sub frame compensating the brightness of the first sub frame. CONSTITUTION: A signal controller(100) generates a first sub frame with the average brightness by operating the average brightness of an original frame inputted from the outside. The signal controller generates at least one second sub frame for compensating for a first sub frame using the first sub frame and the original frame. The signal controller displays the first sub frame and the second sub frame on the display unit successively. The signal controller divides the original frame into the image blocks and calculates the average brightness of each divided image block. A first operator(120) increases the brightness of the original frame twice. A second operator(130) subtracts the first sub frame from the image signal outputted from the first operator.
Abstract:
A backlight unit, a display device and a control method thereof are provided to reduce delay of a video and flickers and reduce the number of drivers for supplying driving power to a light source unit, thereby reducing manufacturing costs. A light source unit(300) has plural independently driven divided areas including light sources, and is in the rear of a display panel(100). A driver unit(400) supplies driving power to the light source unit. A light source controller(500) sequentially supplies the driving power to the divided areas divided in a first direction by being synchronized with a scan period at which an image signal of one frame is displayed, and controls the driver unit to change a lighting period of the divided area according to the kind of an image signal displayed on the display panel.