Abstract:
PURPOSE: Pixels and an organic light emitting device using the same are provided to compensate the threshold voltage of a driving transistor by forming a pixel circuit with a small quantity of transistors. CONSTITUTION: An organic light emitting diode(OLED) is connected between first power source(ELVDD) and second power source(ELVSS). A first transistor(M1) controls a driving current. The driving current flows from the first power source to the second power source through the organic light emitting diode. The first node(N1) of a second transistor(M2) is charged with a first voltage. A first capacitor(C1) is connected between the first node and a second node(N2). A third transistor(M3) supplies a data signal to the second node. A fourth transistor(M4) connects the first node and the second node. A fifth transistor(M5) controls the connection between the first transistor and the second power source in response with a light emitting control signal. The second capacitor(C2) is connected between the second node and a third node(N3).
Abstract:
PURPOSE: A pixel circuit, an organic electroluminescent display device, and a driving method thereof are provided to prevent problems due to a large organic electroluminescent display device by separating initialization time. CONSTITUTION: The gate electrode of a second transistor(T2) is connected to a first scanning line, the first electrode of the second transistor is connected to a data line, and the second electrode of the second transistor is connected to a first node. The gate electrode of a fifth transistor is connected to a third scanning line, the first electrode of the fifth transistor is connected to the first node, and the second electrode of the fifth transistor is connected to a second node. The gate electrode of a fourth transistor is connected to a second scanning line, the first electrode of the fourth transistor is connected to a first power supply device, and the second electrode of the fourth transistor is connected to the second node. The gate electrode of a third transistor is connected to the first scanning line, the first electrode of the third transistor is connected to a second power supply device, and the second electrode of the third transistor is connected to a third node. A first capacitor is connected between the first node and the second node. A second capacitor is connected between the second node and the third node.
Abstract:
PURPOSE: A pixel and an organic light emitting display device using the same are provided to display an image of uniform brightness without respect to a threshold voltage difference between driving transistors. CONSTITUTION: One frame is divided by a reset period, a compensation period, and a light emitting period and driven in an organic light emitting display device. Pixels(140) are located on the part where scanning lines cross data lines. A first control line and a second control line are commonly connected to the pixels. A control line driving unit supplies a first control signal to the first control line and supplies a second control line to the second control line. A data driving unit supplies a reset voltage to data lines during a partial reset period or a partial compensation period.
Abstract:
PURPOSE: An organic electroluminescent display device and a driving method thereof are provided to implement high-speed driving by assigning enough threshold voltage compensation period of a driving transistor. CONSTITUTION: Pixels(140) are located in the intersection of data lines and scan lines. A first control line and a second control line are connected to the pixels in common. A control line driving part(170) supplies a first control signal to the first control line and a second control signal to the second control line not to be overlapped with the first control signal. A first power supply part(160) provides the pixels with first power source whose voltage level is changed more than once for a frame duration.
Abstract:
본 발명은 구동 트랜지스터의 문턱전압과 무관하게 균일한 휘도의 영상을 표시할 수 있도록 한 화소에 관한 것이다. 본 발명의 실시예에 의한 화소는 캐소드전극이 제 2전원과 접속되는 유기 발광 다이오드와; 제 1전원으로부터 상기 유기 발광 다이오드를 경유하여 상기 제 2전원으로 흐르는 전류량을 제어하는 제 1트랜지스터와; 데이터선에 접속되며, i(i는 자연수)번째 주사선으로 주사신호가 공급될 때 턴-온되는 제 2트랜지스터와; 상기 제 2트랜지스터와 상기 제 1트랜지스터의 게이트전극에 사이에 접속되며, i+1번째 주사선으로 주사신호가 공급될 때 턴-온되는 제 3트랜지스터와; 상기 제 1트랜지스터의 게이트전극과 기준전원 사이에 접속되며, 상기 i번째 주사선으로 상기 주사신호가 공급될 때 턴-온되는 제 4트랜지스터와; 상기 유기 발광 다이오드의 애노드전극과 초기전원 사이에 접속되며, 제어선으로 제어신호가 공급될 때 턴-온되는 제 5트랜지스터와; 상기 제 2트랜지스터 및 제 3트랜지스터의 공통노드와 상기 유기 발광 다이오드의 애노드전극 사이에 접속되는 제 1커패시터와; 상기 공통노드와 상기 제 1트랜지스터의 게이트전극 사이에 접속되는 제 2커패시터를 구비한다.
Abstract:
PURPOSE: An organic electroluminescent display device and a driving method thereof are provided to prevent the generation of noise-shaped image by preventing a current from being supplied to an organic light emitting diode. CONSTITUTION: A scan driving part(10) successively supplies a scan signal to scanning lines(S1-Sn). A data driving part(20) supplies a data signal to data lines(D1-Dm). A timing control part(50) controls the scan driving part and the data driving part. An organic light-emitting diode is located in the intersection between the data lines and the scanning lines. A pixel circuit supplies a current to the organic light emitting diode.
Abstract:
PURPOSE: An organic light emitting display is provided to display an image of uniform brightness by compensating the threshold voltage of a driving transistor. CONSTITUTION: A scan driver successively supplies the scanning signal to scanning lines. A data driver supplies the initial power to the data lines for a first period. The data driver(142) supplies the data signal for a second period. The pixels are positioned on the intersection of the scan lines and the data lines.
Abstract:
A flat panel display including a semiconductor circuit, and a method of manufacturing the semiconductor circuit are disclosed. In one embodiment, the semiconductor circuit includes i) a substrate, ii) a semiconductor layer and a first capacitor electrode formed on the substrate, the first capacitor electrode being doped to be conductive, iii) an insulating layer covering the semiconductor layer and the first capacitor electrode, iv) a gate electrode disposed on the insulating layer and corresponding to a portion of the semiconductor layer, and v) a second capacitor electrode disposed on the insulating layer and corresponding to the first capacitor electrode, wherein the gate electrode is thicker than the second capacitor electrode.