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US 2009/0289876 A1Published application
Organic light emitting display
AssigneeSamsung Display Co., Ltd.
InventorHae-Jin Chun
Life of this patent
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Abstract
An organic light emitting display is provided. In each circuit of pixels constituting a pixel unit, a transistor for providing an initialization voltage is arranged so that leakage current is reduced when the transistor is turned off. When the transistor is implemented as a dual gate transistor with a similar transistor from an adjacent pixel, layout space may be conserved.
Claims11
An organic light emitting display, comprising:
- a plurality of gate lines, a plurality of data lines, a plurality of power lines and a plurality of light emission control lines;
- and
- a plurality of pixels at regions defined by the plurality of gate lines, the plurality of data lines, the plurality of power lines, and the plurality of light emission control lines,
- wherein each of the plurality of pixels comprises:
- a first switching transistor for providing a data signal in response to a current scan signal;
- a driving transistor for generating a driving current corresponding to the data signal;
- a capacitor for storing the data signal;
- an electroluminescence element for emitting light in accordance with the driving current;
- and
- a discharge transistor for discharging the data signal from the capacitor in response to a previous scan signal;
- wherein the discharge transistors of at least two adjacent pixels share a same drain and are coupled to a single transistor.
8 more elements
An organic light emitting display comprising:
- a voltage source having an initialization voltage;
- a plurality of pixels, each of the plurality of pixels including a first transistor coupled to the voltage source;
- and
- a second transistor coupled between the first transistors of at least two adjacent pixels of the plurality of pixels and the voltage source;
- wherein gate electrodes of the first transistors of the at least two adjacent pixels and the second transistor are coupled together, drain electrodes of the first transistors of the at least two adjacent pixels are coupled to a source electrode of the second transistor, and a drain electrode of the second transistor is coupled to the voltage source, so that the first transistors and the second transistor are configured to supply the initialization voltage to the at least two adjacent pixels.
2 more elements
A pixel circuit coupled to a gate line, a data line, a power line, and a light emission control line, the pixel circuit comprising:
- a first switching transistor for switching a data signal provided by the data line in response to a current scan signal provided by the gate line;
- a capacitor for storing the data signal;
- a driving transistor for generating a current corresponding to the data signal;
- a compensation transistor for compensating for a threshold voltage of the driving transistor;
- a second switching transistor for connecting the power line to the driving transistor in accordance with a current light emission control signal provided by the light emission control line;
- an electroluminescence element for emitting light in accordance with the current;
- a third switching transistor for providing the current to the electroluminescence element in response to the current light emission control signal;
- and
- a discharge transistor for discharging the data signal from the capacitor;
- wherein the discharge transistor and the discharge transistor of an adjacent pixel circuit comprise a dual gate transistor.
7 more elements
Dependencies are inferred from the claim text.