Abstract:
PURPOSE: An active organic light emitting display device is provided to quickly compensate the deterioration of the active organic light emitting display device by sensing deterioration in an emission section. CONSTITUTION: A data driver(120) changes correction data into an analog correction signal and generates a driving signal according to the analog correction signal. A selecting unit(130) selects a charging path for programming at a programming section according to the driving signal and selects a deterioration detection path at an emission section. A pixel unit charges a value corresponding to the correction data at the programming section according to the driving signal and flows current into an organic light emitting diode at the emission section according to the charged value. An ADC(160) detects a deterioration voltage with deterioration information from the organic light emitting diode of the pixel unit at the emission section.
Abstract:
PURPOSE: A display driving apparatus is provided to minimize power consumption, chip area, and driving delay and to eliminate the under-damping phenomenon of a driving current. CONSTITUTION: A display driving apparatus comprising: a current digital/analog converter(800) generating a data current corresponding to an input of digital data; a data line connected to a pixel circuit requiring data writing on a matrix array of a display panel; an adjacent data line located adjacent to the data line; a current mirror(810) feed backing an excessive charging current generating due to parasitic capacitance of the adjacent data line as a charging current for charging parasitic capacitance of the data line; a current output unit(820) connected to the current mirror and comprising a first driving transistor unit for driving the data line, and a second driving transistor unit for driving the adjacent data line; a source follower driving the current output unit according to an output node voltage of the current digital/analog converter; and a first constant current source discharging parasitic capacitance excessively charged in the data line and the adjacent data line.
Abstract:
PURPOSE: A data driving circuit of an organic light emitting display is provided to improve the stability and secure enough bandwidth and high-speed driving of the feedback loop through main zenith compensation or zero point insertion. CONSTITUTION: A first feedback driver(530) controls the pixel current fed back through a feedback line from a pixel circuit to identical to data current. A second feedback driver(520) keeps the voltage of the feedback line constant and transmits the pixel current to the first feedback driver. A loop compensator(540) secures the stable operation of the feedback loop through main zenith compensation or zero point insertion.
Abstract:
An apparatus for driving display is provided to improve the accuracy of output, to reduce the number of device used for the device implementation and to reduce the whole area by simplifying the circuit structure of the output unit. The apparatus for driving display driving comprises a reference voltage generation part(600), a digital to analog converter(610) and an output unit(620). The reference voltage generation part generates a plurality of reference voltages, receives the difference between two adjacent reference voltages among the reference voltages and generates auxiliary reference voltages. The digital to analog converter selects one of reference voltages and outputs the first analog signal according to the high position N bit data signal among data signal of M bit. The digital to analog converter selects one of supplementary reference voltages and outputs the second analog signal according to the low rank(M-N) bit data signal among data signal of M bit. The output unit adds/subtracts the second analog signal in the first analog signal.
Abstract:
A current generating circuit, a driving IC and a current supplying circuit are provided to have a constant output current, by compensating for an offset voltage of an operational amplifier. An output part(202) includes a first transistor and a second transistor. The first transistor transfers a reference current from a reference current input port to a reference current output port. The second transistor outputs a driving current according to the reference current. A control part(204) controls in order for voltages of three ports of the first transistor to be equal to voltages of corresponding three ports of the second transistor. The first and the second transistor have equal aspect ratio of a channel.
Abstract:
본 발명은 AMOLED를 전류모드로 구동할 경우의 구동속도 저하를 과도 전류 귀환으로써 극복할 수 있도록 함과 더불어 디스플레이 패널의 데이터 라인들을 두 그룹으로 나누어 데이터 기입을 행함으로써 구동 채널 수를 줄일 수 있도록 하는 과도 전류 귀환을 이용한 AMOLED 구동회로 및 구동방법을 제공한다. 본 발명은 전류 DAC의 출력 노드에 드레인단이 연결된 데이터 라인의 구동 트랜지스터; 상기 구동 트랜지스터의 소우스단과 접지 사이에 연결된 정 전류원; 상기 전류 DAC의 출력 노드 및 구동 트랜지스터의 드레인단과 전압원에 연결된 가변 전류원; 상기 전류 DAC의 출력 노드의 전압을 비반전 입력단의 전압으로 하고, 소정 정전압을 반전 입력단의 전압으로 하여 그 출력이 상기 구동 트랜지스터의 게이트단에 입력되도록 된 차동 증폭기; 상기 차동 증폭기의 출력 노드 및 구동 트랜지스터의 게이트단과 상기 가변 전류원에 연결되어 상기 전류 DAC의 출력 노드의 전압 변화에 따라 상기 가변 전류원의 바이어스 전류를 증감시키는 과도 충전 전류 제어부;를 포함하는 것을 특징으로 한다. AMOLED, 더미 데이터 라인, 전류 귀환, 짝홀수 데이터 라인
Abstract:
A displacement sensor and a method for detecting displacement using the same are disclosed. According to an embodiment of the present invention, the displacement sensor comprises: a coupler element which can perform a motion mutually associated with the position of a component; a transmitting coil which is excited by a excitation signal in order to generate electromagnetic radiation; at least one receiving coil which generates a receiving signal through inductive combination with the transmitting coil according to the shielding of the electromagnetic radiation by the coupler element; and two reference coils which generate individual reference signals irrelevant to the position of the coupler element through inductive combination with the transmitting coil. The two reference coils are placed by considering the shape of the coupler element or generate reference signals having a signal change amount different from each other according to changes in a gap from the coupler element. The two reference coils also generate a compensation signal, which includes information on the gap where common mode elements are removed, using a ratio of addition to subtraction for the two reference signals. In addition, a signal processing unit is further included to sense the displacement corresponding to the position of the component by considering the gap in order to compensate for the common mode elements and the gap error and improve accuracy in sensing the displacement. [Reference numerals] (130,BB) Area A; (140,AA) Area B
Abstract:
본 발명은 유기발광표시장치의 데이터 구동회로에 관한 것이다. 보다 구체적으로는 액티브 매트릭스 유기발광소자를 포함한 화소회로를 전류구동방식으로 구동하는 데이터 구동회로에 관한 것이다. 본 발명에 따른 유기발광장치의 데이터 구동회로는 전류 DAC, 제1 피드백 구동부, 제2 피드백 구동부 및 루프 보상부를 포함한다. 본 발명에 따른 유기발광표시장치의 데이터 구동회로는 주극점 보상을 통해 피드백 루프의 안정도를 확보하고, 영점삽입을 통해 디스플레이 패널이 대형화됨에 따라 증가하는 기생성분으로 인한 극점을 상쇄하여 피드백 루프의 충분한 대역폭 및 고속의 구동속도를 확보할 수 있다. 유기발광표시장치, 피드백 구동회로, 기생 커패시턴스, 주극점 보상, 영점삽입
Abstract:
본 발명은 유기발광표시장치 등에 관한 것이다. 이러한 본 발명에 따른 유기발광표시장치는 기준픽셀의 발광량에 따른 제1 제어신호를 출력하는 광검출부와, 제1 제어신호에 따라 기준픽셀로 입력되는 기준전류의 크기를 제어하는 제2 제어신호를 출력하는 기준전류 제어부를 포함하는 기준픽셀 제어부와, 제2 제어신호에 따라 기준전류와 동일한 크기의 전류를 출력하는 전류소오스부와, 기준전류와 동일한 크기의 전류를 데이터신호에 비례하도록 스케일링하여 데이터전류를 출력하는 디지털아날로그변환기를 포함하는 데이터 구동부 및 데이터전류에 따라 발광하는 유기발광소자를 포함하는 픽셀들로 이루어진 디스플레이 패널을 포함한다. 이러한 본 발명에 따르면, OLED의 열화에 따른 밝기감소를 보상하여 유기발광표시장치의 화질이 향상되는 등의 효과가 있다. 유기발광소자, 유기발광표시장치, 광검출부, 기준전류 제어부, 열화
Abstract:
A pixel circuit, a data driving circuit and an organic light emitting display device having the data driver are provided to increase an operational margin of the OLED by compensating for a degradation of a stability of a feedback loop due to a parasitic capacitance and a parasitic resistance. A data driver for an OLED(Organic Light Emitting Device) includes a current DAC(610) and first and second amplifiers(620,630). The current DAC(Digital to Analog Converter) outputs a data current according to input data. The first amplifier is electrically connected to a pixel circuit through a data line and controls the data current, so that the data current is equalized with a current pixel current which is fed back from the pixel circuit through a feedback line. The second amplifier is electrically connected to the pixel circuit through the feedback line and maintains a constant voltage on the feedback line. The second amplifier delivers the pixel current to the first amplifier.