Back to results
US 2006/0139257 A1Published application
Pixel circuit and organic light emitting display
AssigneeSamsung Mobile Display Co., Ltd.
InventorsWon Kwak, Sung Park
Life of this patent
Estimating the term…
Abstract
An organic light emitting display includes a pixel circuit having first, second, and third organic light emitting diodes (OLEDs), for emitting red, green, and blue light, respectively, a driving circuit commonly connected to the OLEDs, and a switching circuits connected to the OLED and the driving circuit to sequentially control the driving thereof. By controlling a plurality of OLEDs, the number of pixel circuits in an organic light emitting display is reduced, thereby reducing the number of scan lines, data lines, and emission control lines, which in turn improves the aperture ratio of the light emitting display. Further, the emission order of the OLEDs is controlled so that it is possible to prevent the generation of color breakup.
Claims25
An organic light emitting display comprising a first pixel, a second pixel, and a third pixel, each pixel comprising:
- a first organic light emitting diode (OLED), a second OLED, and a third OLED for emitting red, green, and blue light, respectively;
- a driving circuit commonly connected to the first, second, and third OLEDs for driving thereof;
- and
- a switching circuit connected to the OLEDs and the driving circuit to sequentially control the driving of the first, second, and third OLEDs,
- wherein the first pixel, the second pixel, and the third pixel are arranged to receive a data signal through a common data line, and an emission order of red, green, and blue light components of the first, second, and third pixels are different from each other, and
- wherein the driving circuit comprises:
- a first transistor for receiving a first power source corresponding to a first voltage applied to a gate thereof to selectively supply driving current to the OLEDs;
- a second transistor for selectively transmitting the data signal to a first electrode of the first transistor according to a first scan signal;
- a third transistor for selectively permitting a flow of electric current to the first transistor so that the first transistor serves as a diode according to the first scan signal;
- a capacitor for storing the voltage applied to the gate of the first transistor while a data voltage is applied to the first electrode of the first transistor and for maintaining the stored voltage in the gate of the first transistor in a period when the OLEDs emit light;
- a fourth transistor for selectively transmitting an initializing signal to the capacitor according to a second scan signal;
- a fifth transistor for selectively transmitting the first power source to the first transistor according to a first emission control signal;
- a sixth transistor for selectively transmitting the first power source to the first transistor according to a second emission control signal;
- and
- a seventh transistor for selectively transmitting the first power source to the first transistor according to a third emission control signal.
12 more elements
An organic light emitting display comprising a first pixel, a second pixel, and a third pixel, each pixel comprising:
- a first organic light emitting diode (OLED), a second OLED, and a third OLED;
- a driving circuit commonly connected to the first, second, and third OLEDs for driving thereof;
- and
- a sequential control circuit connected to the OLEDs and the driving circuit to sequentially control the driving of the first, second, and third OLEDs,
- wherein the first pixel, the second pixel, and third pixel are arranged to receive a data signal through a common data line, and an emission order of red, green, and blue light components of the first, second, and third pixels are different from each other, and
- wherein the driving circuit comprises:
- a first transistor including a first electrode, a second electrode, and a third electrode connected to a first node, a second node, and a third node, respectively;
- a second transistor including a first electrode, a second electrode, and a third electrode connected to a data line, the second node, and a first scan line, respectively;
- a third transistor including a first electrode, a second electrode, and a third electrode are connected to the first node, the third node, and the first scan line, respectively;
- a fourth transistor including a first electrode, a second electrode, and a third electrode connected to the third node, an initializing signal line, and a second scan line, respectively;
- a capacitor including a first electrode and a second electrodes connected to a first power source and the third node, respectively;
- a fifth transistor including a first electrode, a second electrode, and a third electrode connected to the first node, the first power source, and a first emission control line, respectively;
- a sixth transistor including a first electrode, a second electrode, and a third electrode connected to the second node, the first power source and a second emission control line, respectively;
- and
- a seventh transistor including a first electrode, a second electrode, and a third electrode connected to the second node, the first power source, and a third emission control line, respectively.
12 more elements
The organic light emitting display of 10, wherein the initializing signal line is connected to an anode electrode of at least one OLED.
An organic light emitting display comprising a first pixel, a second pixel, and a third pixel, each pixel comprising:
- a first organic light emitting diode (OLED), a second OLED, and a third OLED;
- a driving circuit commonly connected to the first, second, and third OLEDs for driving thereof;
- and
- a sequential control circuit connected to the OLEDs and the driving circuit to sequentially control the driving of the first, second, and third OLEDs,
- wherein the first pixel, the second pixel, and the third pixel are arranged to receive a data signal through a common data line, and the emission order of red, green, and blue light components of the first, second, and third pixels are different from each other, and
- wherein the driving circuit comprises:
- a first transistor including a first electrode, a second electrode, and a third electrode connected to a first node, a second node, and a third node, respectively
- a second transistor including a first electrode, a second electrode, and a third electrode connected to a data line, the first node, and a first scan line, respectively;
- a third transistor including a first electrode, a second electrode, and a third electrode connected to the second node, the third node, and the first scan line, respectively;
- a fourth transistor including a first electrode, a second electrode, and a third electrode connected to the third node, an initializing signal line, and a second scan line respectively;
- a capacitor including a first electrode and a second electrode connected to the first power source and the third node, respectively;
- a fifth transistor including a first electrode, a second electrode, and a third electrode connected to the second node, the first power source, and a first emission control line, respectively;
- a sixth transistor including a first electrode, a second electrode, and a third electrode connected to the second node, the first power source, and a second emission control line, respectively;
- and
- a seventh transistor including a first electrode, a second electrode, and a third electrode connected to the second node, the first power source, and a third emission control line, respectively.
12 more elements
The organic light emitting display of 18, wherein a second scan signal is transmitted to the second scan line that precedes the first scan line to which a first scan signal is transmitted.
Dependencies are inferred from the claim text.