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US 7,057,588 B2Granted
Active-matrix display device and method of driving the same
AssigneeSony Corporation
InventorsMitsuru Asano, Akira Yumoto
Life of this patent
Estimating the term…
Abstract
In an active-matrix display device and a method for driving the active-matrix display device, a fifth transistor is connected between a power line and a drain terminal of a first transistor so that a power-supply voltage, namely the fixed voltage required for the compensation of the threshold voltage, is supplied by the power line via a fifth transistor and not by a signal line. Thus, a sufficient length of time for the threshold voltage compensation period can be maintained, and a second transistor of each pixel can accurately be compensated for threshold voltage irregularities.
Claims12
An active-matrix display device comprising:
- pixel circuits arrayed in a matrix;
- signal lines each of which is interconnected with a corresponding column of the matrix-arrayed pixel circuits;
- and
- a first scanning line, a second scanning line, a third scanning line, and a fourth scanning line that are interconnected with a corresponding row of the matrix-arrayed pixel circuits;
- each of the pixel circuits comprising:
- a first transistor of which a gate terminal is connected with the first scanning line and of which a first electrode terminal is connected with one of the signal lines;
- a first capacitor of which a first end is connected with a second electrode terminal of the first transistor;
- a second capacitor of which a first terminal is connected with the first end or a second end of the first capacitor;
- a second transistor of which a gate terminal is connected with the second end of the first capacitor and of which a first electrode terminal is connected with a first power line;
- a third transistor of which a gate terminal is connected with the second scanning line, a first electrode terminal of the third transistor is connected with the gate terminal of the second transistor, and a second electrode terminal of the third transistor is connected with a second electrode terminal of the second transistor;
- a fourth transistor of which a gate terminal is connected with the third scanning line and of which a first electrode terminal is connected with the second electrode terminal of the second transistor;
- a fifth transistor of which a gate terminal is connected with the fourth scanning line, a first electrode terminal of the fifth transistor is connected with a third power line, and a second electrode terminal of the fifth transistor is connected with the second electrode terminal of the first transistor;
- and
- a display element connected with both a second electrode terminal of the fourth transistor and a second power line.
11 more elements
A method for driving an active-matrix display device, the device comprising:
- pixel circuits arrayed in a matrix;
- signal lines each of which is interconnected with a corresponding column of the matrix-arrayed pixel circuits;
- and a first scanning line, a second scanning line, a third scanning line, and a fourth scanning line that are interconnected with a corresponding row of the matrix-arrayed pixel circuits;
- each of the pixel circuits comprising:
- a first transistor of which a gate terminal is connected with the first scanning line and of which a first electrode terminal is connected with one of the signal lines;
- a first capacitor of which a first end is connected with a second electrode terminal of the first transistor;
- a second capacitor of which a first terminal is connected with the first end or a second end of the first capacitor;
- a second transistor of which a gate terminal is connected with the second end of the first capacitor and of which a first electrode terminal is connected with a first power line;
- a third transistor of which a gate terminal is connected with the second scanning line, a first electrode terminal of the third transistor is connected with the gate terminal of the second transistor, and a second electrode terminal of the third transistor is connected with a second electrode terminal of the second transistor;
- a fourth transistor of which a gate terminal is connected with the third scanning line and of which a first electrode terminal is connected with the second electrode terminal of the second transistor;
- a fifth transistor of which a gate terminal is connected with the fourth scanning line, a first electrode terminal of the fifth transistor is connected with a third power line, and a second electrode terminal of the fifth transistor is connected with the second electrode terminal of the first transistor;
- and a display element connected between a second electrode terminal of the fourth transistor and a second power line;
- the method comprising the steps of:
- turning the first transistor and the fourth transistor off while turning the third transistor and the fifth transistor on to compensate for a threshold voltage of the second transistor in each pixel;
- and
- turning the first transistor on while turning the third transistor and the fifth transistor off to write display data into each pixel from the signal line.
13 more elements
Dependencies are inferred from the claim text.