Display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsJun Koyama, Hajime Kimura
Life of this patent
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Abstract
There is provided an active matrix EL display device that can display a clear multi gray-scale color display to reduce the shift in the potential caused by the potential drop due to the wiring resistance of a power source supply line, in order to decrease the unevenness in a display region. A plurality of drawing out ports of the power source supply line are arranged. Further, in the wiring resistance between the external input terminal and the pixel portion power source supply line, potential compensation is performed by supplying potential to the power source supply line by a feedback amplifier. Further, in addition to above structure, the power source supply line may be arranged in a matrix.
Claims28
A display device comprising:
- a plurality of source signal lines over an insulating surface;
- a plurality of gate signal lines crossing said plurality of source signal lines;
- a plurality of power supply lines comprising a plurality of first power supply lines and a plurality of second power supply lines along said plurality of gate signal lines or said plurality of source signal lines;
- a plurality of pixels disposed in a matrix-form over said insulating surface, each of said plurality of pixels has an EL element, a thin film transistor for switching and a thin film transistor for driving said EL element;
- and
- a first and a second input portions, said first input portion having at least one external input terminal connected to said plurality of first power supply lines and said second input portion having a plurality of at least one external input terminal connected to said plurality of second power supply lines;
- wherein said first and said second input portions are located separately, and
- wherein said plurality of power supply lines are disposed like a matrix.
A display device comprising:
- a plurality of source signal lines over an insulating surface;
- a plurality of gate signal lines crossing said plurality of source signal lines;
- a plurality of power supply lines comprising a plurality of first power supply lines and a plurality of second power supply lines along said plurality of gate signal lines or said plurality of source signal lines;
- a plurality of pixels disposed in a matrix-form over said insulating surface, each of said plurality of pixels has an EL element, a thin film transistor for switching and a thin film transistor for driving said EL element;
- and
- a plurality of input portions, each of said plurality of input portions having a plurality of external input terminals connected to a part of said plurality of power supply lines;
- wherein said plurality of power supply lines are divided in at least two groups, each of said groups is connected to one of said plurality of input portions;
- wherein electric potential is provided to each of said power source supply lines from said plurality of external input terminals, and
- wherein said plurality of power supply lines are disposed like a matrix.
A display device comprising:
- a plurality of source signal lines over an insulating surface;
- a plurality of gate signal lines crossing said plurality of source signal lines;
- a plurality of power supply lines comprising a plurality of first power supply lines and a plurality of second power supply lines along said plurality of gate signal lines or said plurality of source signal lines;
- a plurality of pixels disposed in a matrix-form over said insulating surface, each of said plurality of pixels has an EL element, a thin film transistor for switching and a thin film transistor for driving said EL element;
- a plurality of input portions, each of said plurality of input portions having a plurality of external input terminals connected to a part of said plurality of power supply lines;
- and
- a plurality of feedback amplifiers, each of said plurality of said feedback amplifiers connected to one of said plurality of external input terminals,
- wherein electric potential is provided to each of said plurality of power supply lines from one of said plurality of feedback amplifiers through one of said plurality of external input terminals, and
- wherein said plurality of power supply lines are disposed like a matrix.
Dependencies are inferred from the claim text.