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US 9,959,809 B2Granted
EL display apparatus
AssigneeJoled Inc.
InventorsHiroshi Takahara, Hitoshi Tsuge
Life of this patent
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Abstract
An EL display apparatus according to the present invention includes an EL device adapted to emit light at a luminance corresponding to a current fed thereto. A source driver outputs a current higher than a current corresponding to an analog video signal to the EL device through a source signal line. This operation charges/discharges a parasitic capacitance present in the source signal line. A second gate driver circuit controls a transistor formed between the EL device and the source driver to operate so that the EL device is fed with the current for only a part of a one-frame period. As a result, the El device emits light for only the part of the period.
Claims22
An EL display apparatus comprising:
- a display screen including pixels arranged in a matrix, each of the pixels including an EL device and a pixel circuit;
- a source driver circuit configured to output an analog video signal to each of the pixels;
- a source signal line through which the analog video signal output from the source driver circuit is transmitted;
- and
- a gate driver circuit which includes a first gate driver circuit, a second gate driver circuit, a first gate signal line through which a first selection voltage or a first non-selection voltage output from the first gate driver circuit is transmitted, and a second gate signal line through which a second selection voltage or a second non-selection voltage output from the second gate driver circuit is transmitted, wherein
- the pixel circuit of each of the pixels includes a driving transistor configured to supply a luminescence-causing current to the EL device, a first switching transistor, and a second switching transistor,
- the first switching transistor is disposed on a path through which the luminescence-causing current flows,
- the second switching transistor is configured to apply the analog video signal, which is output from the source driver circuit, to the driving transistor,
- a gate terminal of the first switching transistor is connected to the first gate signal line,
- a gate terminal of the second switching transistor is connected to the second gate signal line,
- the first switching transistor and the second switching transistor are independently on/off controlled by the first gate driver circuit and the second gate driver circuit,
- the source driver circuit is a semiconductor chip and is attached to the EL display apparatus, and
- an output terminal of the source driver circuit is connected to the source signal line.
10 more elements
A method of controlling an EL display apparatus,
- the EL display apparatus comprising:
- a display screen including pixels arranged in a matrix, each of the pixels including an EL device and a pixel circuit;
- a source driver circuit configured to output an analog video signal to each of the pixels;
- a source signal line through which the analog video signal output from the source driver circuit is transmitted;
- and
- a gate driver circuit which includes a first gate driver circuit, a second gate driver circuit, a first gate signal line through which a first selection voltage or a first non-selection voltage output from the first gate driver circuit is transmitted, and a second gate signal line through which a second selection voltage or a second non-selection voltage output from the second gate driver circuit is transmitted,
- the pixel circuit of each of the pixels including a driving transistor configured to supply a luminescence-causing current to the EL device, a first switching transistor, and a second switching transistor,
- the first switching transistor being disposed on a path through which the luminescence-causing current flows,
- the second switching transistor being configured to apply the analog video signal, which is output from the source driver circuit, to the driving transistor,
- a gate terminal of the first switching transistor being connected to the first gate signal line,
- a gate terminal of the second switching transistor being connected to the second gate signal line,
- the source driver circuit being a semiconductor chip and being attached to the EL display apparatus,
- an output terminal of the source driver circuit being connected to the source signal line,
- the method comprising:
- independently on/off controlling the first switching transistor and the second switching transistor by the first gate driver circuit and the second gate driver circuit.
12 more elements
A method of manufacturing an EL display apparatus,
- the EL display apparatus comprising:
- a display screen including pixels arranged in a matrix, each of the pixels including an EL device and a pixel circuit;
- a source driver circuit configured to output an analog video signal to each of the pixels;
- a source signal line through which the analog video signal output from the source driver circuit is transmitted;
- and
- a gate driver circuit which includes a first gate driver circuit, a second gate driver circuit, a first gate signal line through which a first selection voltage or a first non-selection voltage output from the first gate driver circuit is transmitted, and a second gate signal line through which a second selection voltage or a second non-selection voltage output from the second gate driver circuit is transmitted,
- the pixel circuit of each of the pixels including a driving transistor configured to supply a luminescence-causing current to the EL device, a first switching transistor, and a second switching transistor,
- the first switching transistor being disposed on a path through which the luminescence-causing current flows,
- the second switching transistor being configured to apply the analog video signal, which is output from the source driver circuit, to the driving transistor,
- a gate terminal of the first switching transistor being connected to the first gate signal line,
- a gate terminal of the second switching transistor being connected to the second gate signal line,
- the first switching transistor and the second switching transistor being independently on/off controlled by the first gate driver circuit and the second gate driver circuit,
- the source driver circuit being a semiconductor chip and being attached to the EL display apparatus,
- an output terminal of the source driver circuit being connected to the source signal line,
- the method comprising:
- forming the gate driver circuit, the driving transistor, the first switching transistor, and the second switching transistor by a same fabrication process.
13 more elements
Dependencies are inferred from the claim text.