Pixel circuits of flat panel display devices
First Claim
1. A pixel comprising:
- an organic light emitting diode;
a storage capacitor coupled between a first node and a first power source;
a first load coupled between the organic light emitting diode and the first power source;
an amplifier that controls a voltage applied to the first load corresponding to the voltage applied to the first node;
a bias circuit that controls the voltage applied to the first node corresponding to a data signal supplied from a data line; and
a first transistor coupled between the bias circuit and the first node, the first transistor being turned on when a first scan signal is supplied to a first scan line,wherein the voltage applied to the first node is set to have a voltage range narrower than that of the data signal by the bias circuit; and
wherein the bias circuit comprises;
a second load coupled between the first power source and a third node; and
a variable load coupled between the third node and a second power source lower than the first power source, the variable load having resistance changed corresponding to the data signal.
1 Assignment
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Accused Products
Abstract
Disclosed is a pixel capable of finely controlling the amount of current and increasing the voltage range of a data signal. A pixel includes an organic light emitting diode, a first transistor, a storage capacitor, a load and an amplifier. The first transistor is coupled between a scan line and a data line, and supplies a data signal supplied to the data line to a first node when a scan signal is supplied to the scan line. The storage capacitor is coupled between the first node and a first power source, and charges a voltage corresponding to the data signal. The load is coupled between the organic light emitting diode and the first power source. The amplifier controls a voltage applied to the load corresponding to the voltage charged in the storage capacitor.
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Citations
10 Claims
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1. A pixel comprising:
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an organic light emitting diode; a storage capacitor coupled between a first node and a first power source; a first load coupled between the organic light emitting diode and the first power source; an amplifier that controls a voltage applied to the first load corresponding to the voltage applied to the first node; a bias circuit that controls the voltage applied to the first node corresponding to a data signal supplied from a data line; and a first transistor coupled between the bias circuit and the first node, the first transistor being turned on when a first scan signal is supplied to a first scan line, wherein the voltage applied to the first node is set to have a voltage range narrower than that of the data signal by the bias circuit; and wherein the bias circuit comprises; a second load coupled between the first power source and a third node; and a variable load coupled between the third node and a second power source lower than the first power source, the variable load having resistance changed corresponding to the data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pixel comprising:
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an organic light emitting diode; a current source that generates current varied depending on a difference between a predetermined first voltage and a variable second voltage and supplies the generated current to the organic light emitting diode; and a bias circuit that outputs the variable second voltage depending on an input data voltage and controls a variable amplitude of the variable second voltage with respect to the amplitude of the input data voltage using a variable load, wherein the bias circuit comprises; a predetermined load coupled between a power source and a first node; and the variable load coupled between the first node and a second power source lower than the first power source, the variable load having resistance changed corresponding to the input data voltage.
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Specification