DISPLAY DEVICE AND ITS DRIVING METHOD
First Claim
1. A display device of an electric current driving type, comprising:
- a plurality of pixel circuits arranged in correspondence with intersections of a plurality of scanning lines and a plurality of data lines, each pixel circuit including an electro-optical element and a drive element having a control terminal connected to the data line through a switching element;
a scanning signal output circuit selecting a write-target pixel circuit through use of the scanning line, and exercising control such that the selected pixel circuit outputs, to the data line, a voltage which depends on a threshold voltage of the drive element; and
a display signal output circuit applying, to the data line, a voltage obtained by adding or subtracting a correction voltage corresponding to the threshold voltage to or from a data voltage corresponding to display data, based on the voltage outputted to the data line.
1 Assignment
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Accused Products
Abstract
In a pixel circuit 10, TFTs 12 and 13 are turned on while a TFT 14 is turned off, and a voltage (VDD+Vx) which depends on a threshold voltage Vth of a driving TFT 11 is read onto a data line Sj. Moreover, switches 21 and 22 in a source driver circuit are turned on, and a voltage Vx is held at a capacitor 26. Next, the TFT 13 is turned off, states of switches 21 to 24 are switched, and a voltage (Vdata+Vx) is applied to the data line Sj. Further, the TFT 12 is turned off while the TFT 14 is turned on. An amount of an electric current flowing through an organic EL element 15 after the turn-on of the TFT 14 is determined from the voltage (Vdata+Vx) of a gate terminal of the driving TFT 11. Thus, it is possible to efficiently utilize an amplitude of a data voltage and compensate variations in threshold voltage of the driving TFT 11 with high accuracy, without increasing a scale of the pixel circuit 10.
142 Citations
11 Claims
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1. A display device of an electric current driving type, comprising:
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a plurality of pixel circuits arranged in correspondence with intersections of a plurality of scanning lines and a plurality of data lines, each pixel circuit including an electro-optical element and a drive element having a control terminal connected to the data line through a switching element; a scanning signal output circuit selecting a write-target pixel circuit through use of the scanning line, and exercising control such that the selected pixel circuit outputs, to the data line, a voltage which depends on a threshold voltage of the drive element; and a display signal output circuit applying, to the data line, a voltage obtained by adding or subtracting a correction voltage corresponding to the threshold voltage to or from a data voltage corresponding to display data, based on the voltage outputted to the data line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for driving a display device including a plurality of pixel circuits arranged in correspondence with intersections of a plurality of scanning lines and a plurality of data lines, each pixel circuit including an electro-optical element and a drive element having a control terminal connected to the data line through a switching element, the method comprising the steps of:
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selecting a write-target pixel circuit through use of the scanning line, and exercising control such that the selected pixel circuit outputs, to the data line, a voltage which depends on a threshold voltage of the drive element; and applying, to the data line, a voltage obtained by adding or subtracting a correction voltage corresponding to the threshold voltage to or from a data voltage corresponding to display data, based on the voltage outputted to the data line.
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Specification