Light emitting display, display panel, and driving method thereof
First Claim
1. A light emitting display comprising:
- a display panel on which are formed a plurality of data lines-for transmitting a data current that displays video signals, a plurality of scan lines for transmitting a select signal, and a plurality of pixel circuits formed at a plurality of pixels defined by the data lines and the scan lines, wherein at least one pixel circuit includes;
a light emitting element for emitting light corresponding to an applied current;
a first transistor, having first and second main electrodes and a control electrode, for supplying a driving current for the light emitting element;
a first switch for diode-connecting the first transistor in response to a first control signal;
a first storage unit for storing a first voltage corresponding to a threshold voltage of the first transistor in response to a second control signal;
a second switch for transmitting a data signal from a data line in response to the select signal from the scan line;
a second storage unit for storing a second voltage corresponding to the data current from the first switch; and
a third switch for transmitting the driving current from the first transistor to the light emitting element in response to a third control signal;
wherein a third voltage determined by coupling of the first and second storage units respectively storing the first and second voltages is applied to the first transistor to supply the driving current to the light emitting element.
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Accused Products
Abstract
A light emitting display for compensating for the threshold voltage of transistor or mobility and fully charging a data line. A transistor and first through third switches are formed on a pixel circuit of an organic EL display. The transistor supplies a driving current for emitting an organic EL element (OLED). The first switch diode-connects the transistor. A first storage unit stores a first voltage corresponding to a threshold voltage of the transistor. A second switch transmits a data current in response to a select signal. A second storage unit stores a second voltage corresponding to the data current. A third switch transmits the driving current to the OLED. A third voltage determined by coupling of the first and second storage units is applied to a transistor to supply the driving current to the OLED.
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Citations
40 Claims
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1. A light emitting display comprising:
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a display panel on which are formed a plurality of data lines-for transmitting a data current that displays video signals, a plurality of scan lines for transmitting a select signal, and a plurality of pixel circuits formed at a plurality of pixels defined by the data lines and the scan lines, wherein at least one pixel circuit includes;
a light emitting element for emitting light corresponding to an applied current;
a first transistor, having first and second main electrodes and a control electrode, for supplying a driving current for the light emitting element;
a first switch for diode-connecting the first transistor in response to a first control signal;
a first storage unit for storing a first voltage corresponding to a threshold voltage of the first transistor in response to a second control signal;
a second switch for transmitting a data signal from a data line in response to the select signal from the scan line;
a second storage unit for storing a second voltage corresponding to the data current from the first switch; and
a third switch for transmitting the driving current from the first transistor to the light emitting element in response to a third control signal;
wherein a third voltage determined by coupling of the first and second storage units respectively storing the first and second voltages is applied to the first transistor to supply the driving current to the light emitting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A display panel of a light emitting display comprising:
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a plurality of data lines for transmitting a data current that displays video signals;
a plurality of scan lines for transmitting a select signal;
a plurality of pixels defined by the data lines and the scan lines; and
a pixel circuit formed at each of the plurality of pixels;
wherein at least one pixel circuit includes;
a first transistor having a first main electrode coupled to a first power supplying a first voltage;
a first switch coupled between a second main electrode of the first transistor and a data line and controlled by a first select signal from the scan line;
a second switch controlled by a first control signal to diode-connect the first transistor;
a third switch having a first end coupled to a control electrode of the first transistor, and being controlled by a second control signal;
a fourth switch having a first end coupled to a second main electrode of the first transistor, and being controlled by a third control signal;
a light emitting element, coupled between a second end of the fourth switch and a second power supplying a second voltage, for emitting light corresponding to an applied current;
a first storage unit coupled between the control electrode and the first main electrode of the first transistor when the third switch is turned on; and
a second storage unit coupled between the control electrode and the first main electrode of the first transistor when the third switch is turned off. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for driving a light emitting display having a pixel circuit including a switch for transmitting a data current from a data line in response to a select signal from a scan line, a transistor including a first main electrode, a second main electrode and a control electrode for outputting a driving current in response to the data current, and a light emitting element for emitting light corresponding to the driving current from the transistor, the method comprising:
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storing a first voltage corresponding to a threshold voltage of the transistor in a first storage unit formed between the control electrode and the first main electrode of the transistor;
storing a second voltage corresponding to the data current from the switch in a second storage unit formed between the control electrode and the first main electrode of the transistor;
coupling the first storage unit and the second storage unit to establish a voltage between the control electrode and the first main electrode of the transistor as a third voltage; and
transmitting the driving current from the transistor to the light emitting display;
wherein the driving current from the transistor is determined corresponding to the third voltage. - View Dependent Claims (26, 27)
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28. A method for driving a light emitting display having a pixel circuit including a switch for transmitting a data current from a data line in response to a select signal from a scan line, a transistor including first and second main electrodes and a control electrode for outputting a driving current in response to the data current, and a light emitting element for emitting light corresponding to the driving current from the transistor, comprising:
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diode-connecting the transistor in response to a first control signal, and coupling a first storage unit between the control electrode and the first main electrode of the transistor in response to a first level of a second control signal to store a first voltage corresponding to a threshold voltage of the transistor in the first storage unit;
diode-connecting the transistor by the first control signal, coupling a second storage unit between the control electrode and the first main electrode of the transistor in response to a second level of the second control signal, and storing a second voltage corresponding to the data current in the second storage unit in response to the first select signal;
coupling the first storage unit and the second storage unit in response to the first level of the second control signal to establish a voltage between the control electrode and the first main electrode of the transistor as a third voltage;
providing the driving current corresponding to the third voltage to the transistor; and
providing the driving current to the light emitting element in response to a third control signal. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. In a method for transmitting a data current showing video signals to a transistor in response to a first select signal to drive a light emitting element, a method for driving a light emitting display comprising:
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establishing a first control signal and a second control signal respectively applied to a first switch and a second switch at an enable level to store a first voltage corresponding to a threshold voltage of the transistor;
establishing a third control signal applied to a third switch at a disable level to electrically intercept the transistor and the light emitting element;
establishing the first select signal at a disable level to intercept the data current;
establishing the first select signal at an enable level to supply the data current;
respectively establishing the first control signal and the second control signal at enable and disable levels to store a second voltage corresponding to the data current;
establishing the first select signal at a disable level to intercept the data current;
respectively establishing the first control signal and the second control signal at disable and enable levels to apply a third voltage to a main electrode and a gate electrode of the transistor; and
establishing the third control signal at an enable level to transmit the current from the transistor to the light emitting element;
wherein the third voltage is determined by the first voltage and the second voltage. - View Dependent Claims (37, 38, 39, 40)
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Specification