Drive method of el display panel
First Claim
1. A drive method for an EL display panel, the EL display panel comprising:
- EL elements arranged in a matrix;
driver transistors which supply current to be passed through the EL elements;
first switching elements placed in current paths of the EL elements;
a gate driver circuit which turns on and off the first switching elements for control; and
a source driver circuit which supplies programming current to the driver transistors, wherein the driver transistors are p-channel transistors, unit transistors which generate the programming current in the source driver circuit are n-channel transistors, and the gate driver circuit turns off the first switching elements at least two or more times during one frame period or one field period.
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Accused Products
Abstract
In order to charge and discharge parasitic capacitance of a source signal line sufficiently and program a predetermined current value into a pixel transistor, it is necessary to output a relatively large current from the source driver circuit.
However, if such a large current is passed through the source signal line, the value of this current is programmed into the pixel, causing a larger than desired current to flow through an EL element 15.
For example, if a 10 times larger current is used for programming, a 10 times larger current flows through the EL element 15, and thus the EL element 15 illuminates 10 times more brightly. To obtain predetermined emission brightness, the time during which the current flows through the EL element can be reduced to 1/10 of one frame (1 F). This way, the parasitic capacitance of the source signal line can be charged and discharged sufficiently and the predetermined emission brightness can be obtained.
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Citations
15 Claims
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1. A drive method for an EL display panel, the EL display panel comprising:
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EL elements arranged in a matrix;
driver transistors which supply current to be passed through the EL elements;
first switching elements placed in current paths of the EL elements;
a gate driver circuit which turns on and off the first switching elements for control; and
a source driver circuit which supplies programming current to the driver transistors, wherein the driver transistors are p-channel transistors, unit transistors which generate the programming current in the source driver circuit are n-channel transistors, and the gate driver circuit turns off the first switching elements at least two or more times during one frame period or one field period. - View Dependent Claims (2, 4)
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3. A drive method for an EL display panel, the EL display panel comprising:
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EL elements arranged in a matrix;
driver transistors which supply current to be passed through the EL elements;
first switching elements placed in current paths of the EL elements;
a gate driver circuit which turns on and off the first switching elements for control; and
a source driver circuit which supplies programming current to the driver transistors, wherein the driver transistors are p-channel transistors, unit transistors which generate the programming current in the source driver circuit are n-channel transistors, a period during which a pixel row is selected and programmed with current is constructed from a first period and second period, a first current is applied during the first period, a second current is applied during the second period, the first current is larger than the second current, and the source driver circuit outputs the first current during the first period and outputs the second current during the second period which comes after the first period.
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5. An EL display panel, comprising:
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a source driver circuit which outputs programming current;
EL elements arranged in a matrix;
driver transistors which supply current to be passed through the EL elements;
first switching elements placed in current paths of the EL elements;
second switching elements which constitute paths used to transmit programming current to the driver transistors;
a first gate driver circuit which turns on and off the first switching elements for control;
a second gate driver circuit which turns on and off the second switching elements for control;
a source driver circuit which supplies programming current to the driver transistors, wherein the driver transistors are p-channel transistors, unit transistors which generate the programming current in the source driver circuit are n-channel transistors, the first gate driver circuit turns off the first switching elements a number of times during one frame period or one field period, the first gate driver circuit is placed or formed on one side of the display panel, and the second gate driver circuit is placed or formed on another side of the display panel. - View Dependent Claims (6)
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7. An EL display panel, comprising:
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gate signal lines;
source signal lines;
a source driver circuit which outputs programming current;
a gate driver circuit;
EL elements arranged in a matrix;
driver transistors which supply current to be passed through the EL elements;
first transistors placed in current paths of the EL elements;
second transistors which constitute paths used to transmit programming current to the driver transistors; and
a source driver circuit which supplies programming current to the driver transistors, wherein the driver transistors are p-channel transistors, unit transistors which generate the programming current in the source driver circuit are n-channel transistors, the source driver circuit outputs programming current to the source signal lines, the gate driver circuit is connected to the gate signal lines, gate terminals of the second transistors are connected to the gate signal lines, source terminals of the second transistors are connected to the source signal lines, drain terminals of the second transistors are connected to drain terminals of the driver transistors, and the gate driver circuit selects a plurality of gate signal lines and supplies the programming current to the driver transistors of a plurality of pixels. - View Dependent Claims (9, 10)
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8. An EL display panel, comprising:
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a display area of I pixel rows (I is an integer larger than
1) and J pixel columns (J is an integer larger than
1);
a source driver circuit which applies an image signal to source signal lines in the display area;
a gate driver circuit which applies a turn-on voltage or turn-off voltage to gate signal lines in the display area; and
a dummy pixel row formed outside the display area, wherein EL elements are arranged in a matrix in the display area and emit light based on the image signal from the source driver circuit, and the dummy pixel row either does not to emit light or emits light not visible to the eye.
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11. An EL display panel, comprising:
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EL elements arranged in a matrix;
driver transistors which supply current to be passed through the EL elements;
first switching elements placed in current paths of the EL elements;
a gate driver circuit which turns on and off the first switching elements for control; and
a source driver circuit which supplies programming current to the driver transistors, wherein the driver transistors and the first switching elements are p-channel transistors, unit transistors which generate the programming current in the source driver circuit are n-channel transistors, and unit transistors which generate the programming current in the source driver circuit are n-channel transistors.
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12. A drive method for an EL display panel, comprising:
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supplying EL elements with a current which makes the EL elements emit light brighter than a predetermined brightness; and
making the EL elements emit light for a period equal to 1/N of one frame period or one field period (N is larger than
1). - View Dependent Claims (13)
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14. A drive method for an EL display panel which uses a current to program currents to be passed through EL elements, comprising:
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making the EL elements emit light brighter than a predetermined brightness;
displaying a display area equal to 1/N(N>
1) of an entire screen; and
shifting the display area of 1/N of the entire screen in sequence to display the entire screen.
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15. An EL display apparatus comprising:
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an EL display panel comprising EL elements arranged in a matrix;
driver transistors which supply current to be passed through the EL elements;
first switching elements placed in current paths of the EL elements; and
a gate driver circuit which turns on and off the first switching elements, and a receiver.
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Specification