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US 2018/0005572 A1Published application
Pixel, stage circuit and organic light emitting display device having the pixel and the stage circuit
AssigneeSamsung Display Co., Ltd.
InventorsJi Hyun KA, Won Kyu KWAK, Han Sung BAE
Life of this patent
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Abstract
A pixel includes a plurality of transistors and an organic light emitting diode. The transistors include a first transistor to control an amount of current flowing to the organic light emitting diode. Additional transistors are connected to the first transistor or the organic light emitting diode. The first transistor is a Low Temperature Poly-Silicon (LTPS) thin film transistor. One or more of the other transistors are oxide semiconductor transistors.
Claims20
A pixel, comprising:
- an organic light emitting diode;
- a first transistor to control an amount of current flowing from a first driving power supply connected to a first electrode, through the organic light emitting diode, and to a second driving power supply based on a voltage of a first node, the first transistor being an n-type Low Temperature Poly-Silicon (LTPS) thin film transistor;
- a second transistor connected between a data line and the first node, the second transistor to turn on when a scan signal is supplied to a first scan line, the second transistor being an n-type oxide semiconductor thin film transistor;
- a third transistor connected between a second electrode of the first transistor and an initialization power supply, the third transistor to turn on when a scan signal is supplied to a second scan line, the third transistor being an n-type LTPS thin film transistor;
- a fourth transistor connected between the first driving power supply and a first electrode of the first transistor, the fourth transistor to turn off when a light emission control signal is supplied to a light emission control line, the fourth transistor being an n-type LTPS thin film transistor;
- and
- a storage capacitor connected between a second node connected to a second electrode of the first transistor and the first node.
4 more elements
A stage circuit, comprising:
- a buffer to connect a first input terminal or a second input terminal to an output terminal based on control of a signal generator, wherein the buffer includes a first transistor and a second transistor connected in parallel between the first input terminal and the output terminal, and a third transistor and a fourth transistor connected in parallel between the second input terminal and the output terminal, wherein the first and third transistors are n-type LTPS thin film transistors and wherein the second and fourth transistors are n-type oxide semiconductor thin film transistors.
An organic light emitting display device, comprising:
- a plurality of pixels connected to scan lines, light emission control lines and data lines;
- a scan driver to drive the scan lines and the light emission control lines;
- and
- a data driver to drive the data lines, wherein at least one of the pixels includes:
- an organic light emitting diode;
- a first transistor to control an amount of current flowing from a first driving power supply connected to a first electrode, through the organic light emitting diode, and to a second driving power supply based on a voltage of a first node, wherein the first transistor is an n-type LTPS thin film transistor;
- a second transistor connected between a data line and the first node, the second transistor to turn on when a scan signal is supplied to a first scan line, the second transistor being an n-type oxide semiconductor thin film transistor;
- a third transistor connected between a second electrode of the first transistor and an initialization power supply, the third transistor to turn on when a scan signal is supplied to a second scan line, the third transistor being an n-type LTPS thin film transistor;
- a fourth transistor connected between the first driving power supply and a first electrode of the first transistor, the fourth transistor to turn off when a light emission control signal is supplied to a light emission control line, the fourth transistor being an n-type LTPS thin film transistor;
- and
- a storage capacitor connected between a second node coupled to a second electrode of the first transistor and the first node.
8 more elements
A pixel, comprising:
- a first transistor;
- a second transistor;
- and
- an organic light emitting diode,
- wherein the first transistor is to control an amount of current flowing to the organic light emitting diode and wherein the first transistor is a Low Temperature Poly-Silicon (LTPS) thin film transistor and the second transistor is different from an LTPS transistor.
2 more elements
Dependencies are inferred from the claim text.