DISPLAY DEVICE AND DRIVING METHOD THEREOF
First Claim
1. A display device comprising:
- a plurality of data lines for supplying a data current;
a plurality of scan lines for transmitting a selection signal; and
a pixel portion comprising a plurality of pixel circuits connected to the plurality of data lines and the plurality of scan lines, each of the plurality of pixel circuit comprising;
a display element which emits light at luminance corresponding to the data current;
a transistor having a source electrode, a drain electrode, and a gate electrode, the transistor supplying the data current to the display element and;
a first power supply line connected to the transistor;
a second power supply line connected to the display element;
a first capacitor which holds a voltage between the source electrode of the first transistor and the gate electrode of the first transistor;
a first switch element which selects a connection between the drain electrode of the first transistor and the gate electrode of the first transistor;
a second switch element which selects a connection between one of the plurality of the data lines and the display element;
a third switch element which selects a connection between the first transistor and the display element; and
a fourth switch element which selects a connection between the first capacitor and the display element, wherein the display element functions as a second capacitor.
1 Assignment
0 Petitions
Accused Products
Abstract
To solve the lack of program time, which is a problem of a display device including an EL element, and to provide a display device including a pixel circuit with a high aperture ratio and a driving method thereof. In a circuit including a driving transistor, a capacitor, a display element which can be used as a capacitor, a first power supply line and a second power supply line, potentials of the first power supply line and the second power supply line are set to be almost the same, thereby a threshold voltage of the driving transistor is held in the display element, and after that, a charge is divided into the display element and the capacitor.
61 Citations
62 Claims
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1. A display device comprising:
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a plurality of data lines for supplying a data current;
a plurality of scan lines for transmitting a selection signal; and
a pixel portion comprising a plurality of pixel circuits connected to the plurality of data lines and the plurality of scan lines, each of the plurality of pixel circuit comprising;
a display element which emits light at luminance corresponding to the data current;
a transistor having a source electrode, a drain electrode, and a gate electrode, the transistor supplying the data current to the display element and;
a first power supply line connected to the transistor;
a second power supply line connected to the display element;
a first capacitor which holds a voltage between the source electrode of the first transistor and the gate electrode of the first transistor;
a first switch element which selects a connection between the drain electrode of the first transistor and the gate electrode of the first transistor;
a second switch element which selects a connection between one of the plurality of the data lines and the display element;
a third switch element which selects a connection between the first transistor and the display element; and
a fourth switch element which selects a connection between the first capacitor and the display element, wherein the display element functions as a second capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A display device comprising:
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a plurality of data lines for supplying a data current;
a plurality of scan lines for transmitting a selection signal; and
a pixel portion comprising a plurality of pixel circuits connected to the plurality of data lines and the plurality of scan lines, each of the plurality of pixel circuit comprising;
a display element which emits light at luminance corresponding to the data current;
a first transistor having a source electrode, a drain electrode, and a gate electrode, the transistor supplying the data current to the display element and;
a first power supply line connected to the transistor;
a second power supply line connected to the display element;
a first capacitor which holds a voltage between the source electrode of the first transistor and the gate electrode of the first transistor;
a second transistor which selects a connection between the drain electrode of the first transistor and the gate electrode of the first transistor;
a third transistor element which selects a connection between one of the plurality of the data lines and the display element;
a fourth transistor which selects a connection between the first transistor and the display element; and
a fifth transistor which selects a connection between the first capacitor and the display element, wherein the display element functions as a second capacitor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A display device comprising:
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first and second wires;
a capacitor;
a display element;
a transistor; and
first to fourth switch element, wherein a gate electrode of the transistor is electrically connected to the first wire through the capacitor, wherein a first terminal of the first transistor is electrically connected to the first wire, wherein a second terminal of the first transistor is electrically connected to the gate electrode through the first switch element and electrically connected to the second wire through the second switch element, and wherein a first electrode of the display element is electrically connected to the second terminal of the first transistor through the third switch element and electrically connected to one electrode of the capacitor through the fourth switch element. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A display device comprising:
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first and second wires;
a capacitor;
a display element; and
first to fifth transistors, wherein a gate electrode of the first transistor is electrically connected to the first wire through the capacitor, wherein a first terminal of the first transistor is electrically connected to the first wire, wherein a second terminal of the first transistor is electrically connected to the gate electrode through the second transistor and electrically connected to the second wire through the third transistor, and wherein a first electrode of the display element is electrically connected to the second terminal of the first transistor through the fourth transistor and electrically connected to one electrode of the capacitor through the fifth transistor. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A driving method of a display device comprising:
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storing a charge in a display element in a threshold writing period by turning a first transistor on, turning a second transistor on, turning a third transistor off, turning a fourth transistor off, and turning a fifth transistor on; and
emitting light from the display element in a light emitting period by turning the second transistor off, turning the third transistor off, turning the fourth transistor on, and turning the fifth transistor off, after the threshold writing period, wherein the second transistor is connected to the first transistor, wherein the third transistor is provided between the first transistor and a current source, and wherein a fourth transistor and a fifth transistor are provided between the display element and the first transistor. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48)
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49. A driving method of a display device comprising:
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dividing a charge into a display element and a capacitor in a Cs rewriting period by turning a second transistor off, turning a third transistor off, turning a fourth transistor off, and turning a fifth transistor on; and
emitting light from the display element in a light emitting period by turning a first transistor on, turning the second transistor off, turning the third transistor off, turning the fourth transistor on, and turning the fifth transistor off, after the Cs rewriting period, wherein the second transistor is connected to the first transistor, wherein the third transistor is provided between the first transistor and a current source, and wherein a fourth transistor and a fifth transistor are provided between the display element and the first transistor. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56)
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57. A driving method of a display device comprising:
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storing a first charge in the display element;
storing a second charge in the capacitor;
dividing the stored first charge and the stored second charge into the display element and the capacitor by electrically connecting the display element and the capacitor each other through a switch element; and
emitting light from the display element by turning a transistor on, wherein a gate electrode of the transistor is electrically connected to the capacitor and the switch element, wherein one of the source electrode and the drain electrode is electrically connected to the capacitor, and wherein the other of source electrode and the drain electrode is electrically connected to the switch element and the display element. - View Dependent Claims (58, 59, 60, 61, 62)
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Specification