Electro-optical device, method of driving electro-optical device, and electronic apparatus
First Claim
1. An electro-optical device, comprising:
- a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit that outputs a scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written; and
a data-line driving circuit that cooperates with the scanning-line driving circuit and that outputs data to the data line corresponding to the pixel to which data is written, each of the pixels including;
an electro-optical element that emits light with a brightness corresponding to a driving current;
a storage device that stores the data supplied via the data line;
a drive element that sets the driving current, which is supplied to the electro-optical element, according to the data stored in the storage device; and
a control element that repeatedly interrupts a current path for the driving current for a period after the scanning line corresponding to the pixel to which data is written is selected until a next time this scanning line is selected.
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Accused Products
Abstract
The present invention provides a technique to improve the display quality of an electro-optical device using an electro-optical element which emits light with a brightness corresponding to a driving current. Each pixel can include an organic EL element OLED which emits light with a brightness corresponding to a driving current, a capacitor for storing an electric charge corresponding to data supplied via a data line, a drive transistor for setting a driving current according to the electric charge stored in the capacitor and for supplying the set driving current to the organic EL element OLED, and a control transistor which repeats interruption of a current path for the driving current in one vertical scanning period.
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Citations
23 Claims
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1. An electro-optical device, comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit that outputs a scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written; and
a data-line driving circuit that cooperates with the scanning-line driving circuit and that outputs data to the data line corresponding to the pixel to which data is written, each of the pixels including;
an electro-optical element that emits light with a brightness corresponding to a driving current;
a storage device that stores the data supplied via the data line;
a drive element that sets the driving current, which is supplied to the electro-optical element, according to the data stored in the storage device; and
a control element that repeatedly interrupts a current path for the driving current for a period after the scanning line corresponding to the pixel to which data is written is selected until a next time this scanning line is selected. - View Dependent Claims (18)
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2. An electro-optical device, comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit that outputs the scanning signal to the scanning lines to select the scanning line corresponding to a pixel to which data is written, and a data-line driving circuit that cooperates with the scanning-line driving circuit and that outputs data to the data line corresponding to the pixel to which data is written, each of the pixels including;
an electro-optical element that emits light with a brightness corresponding to a driving current;
a capacitor that stores an electric charge corresponding to the data supplied via the data line to write the data;
a drive transistor that sets the driving current according to the electric charge stored in the capacitor and supplying the driving current to the electro-optical element; and
a control transistor that repeatedly interrupts a current path for the driving current for a period after the scanning line corresponding to the pixel to which data is written is selected until a next time this scanning line is selected. - View Dependent Claims (3, 4, 5)
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6. An electro-optical device, comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit that outputs a first scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written and that outputs a second scanning signal synchronous with the first scanning signal and a pulse signal synchronous with the first scanning signal; and
a data-line driving circuit that cooperates with the scanning-line driving circuit for outputting a data current to the data line corresponding to the pixel to which data is written, each of the pixels including;
a first switching transistor having one of a source terminal and a drain terminal coupled with the data line so as to be controlled by the first scanning signal;
a second switching transistor having one of a source terminal and a drain terminal coupled with the other terminal of the first switching transistor so as to be controlled by the second scanning signal;
a capacitor coupled with the other terminal of the second switching transistor;
a programming transistor having a drain commonly coupled with the other terminal of the first switching transistor and the one terminal of the second switching transistor, and a gate commonly coupled with the other terminal of the second switching transistor and the capacitor, so that an electric charge corresponding to the data current is stored in the capacitor connected with the gate of this programming transistor;
a drive transistor paired with the programming transistor to form a current mirror circuit that sets a driving current according to the electric charge stored in the capacitor, which is connected with a gate thereof;
an electro-optical element that emits light with a brightness corresponding to the driving current; and
a control transistor provided in a current path for the driving current that interrupts the current path for the driving current under conduction control of the pulse signal. - View Dependent Claims (7, 8, 9)
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10. An electro-optical device, comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit that outputs a scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written and that outputs a pulse signal synchronous with the scanning signal; and
a data-line driving circuit that cooperates with the scanning-line driving circuit and that outputs a data current to the data line corresponding to the pixel to which data is written, each of the pixels including;
a first switching transistor having one of a source terminal and a drain terminal coupled with the data line so as to be coupled by the scanning signal;
a second switching transistor which is coupled by the scanning signal;
a capacitor coupled between the other terminal of the first switching transistor and one terminal of the second switching transistor;
a drive transistor having a source coupled with the other terminal of the first switching transistor, a gate coupled with the one terminal of the second switching transistor, and a drain coupled with the other terminal of the second switching transistor for storing an electric charge corresponding to the data current in the capacitor, which is coupled between the gate and source of the drive transistor, and for setting a driving current according to the electric charge stored in the capacitor;
an electro-optical element that emits light with a brightness corresponding to the driving current; and
a control transistor repeatedly interrupts a current path for the driving current under conduction control of the pulse signal for a period after the scanning line corresponding to the pixel to which data is written is selected until the next time this scanning line is selected. - View Dependent Claims (11)
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12. An electro-optical device, comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit and that outputs a scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written and for outputting a pulse signal synchronous with the scanning signal; and
a data-line driving circuit that cooperates with the scanning-line driving circuit and that output a data current to the data line corresponding to the pixel to which data is written, each of the pixels including;
a first switching transistor having one of a source terminal and a drain terminal coupled with the data line so as to be controlled by the scanning signal;
a second switching transistor having one of a source terminal and a drain terminal coupled with the other terminal of the first switching transistor so as to be controlled by the scanning signal;
a capacitor coupled with the other terminal of the second switching transistor;
a drive transistor having a gate commonly coupled with the other terminal of the second switching transistor and the capacitor, and a drain commonly coupled with the other terminal of the first switching transistor and the one terminal of the second switching transistor for storing an electric charge corresponding to the data current in the capacitor, which is coupled with the gate of the drive transistor, and for setting a driving current according to the electric charge stored in the capacitor;
an electro-optical element that emits light with a brightness corresponding to the driving current; and
a control transistor that repeatedly interrupts a current path for the driving current under conduction control of the pulse signal for a period after the scanning line corresponding to the pixel to which data is written is selected until the next time this scanning line is selected. - View Dependent Claims (13)
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14. An electro-optical device, comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit that outputs a scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written and that outputs a pulse signal synchronous with the scanning signal; and
a data-line driving circuit that cooperates with the scanning-line driving circuit that outputs a data voltage to the data line corresponding to the pixel to which data is written, each of the pixels including;
a switching transistor having one of a source terminal and a drain terminal coupled with the data line so as to be controlled by the scanning signal;
a capacitor coupled with the other terminal of the switching transistor for storing an electric charge corresponding to the data voltage;
a drive transistor having a gate commonly coupled with the other terminal of the switching transistor and the capacitor for setting a driving current according to the electric charge stored in the capacitor;
an electro-optical element that emits light with a brightness corresponding to the driving current; and
a control transistor that repeatedly interrupts a current path for the driving current under conduction control of the pulse signal for a period after the scanning line corresponding to the pixel to which data is written is selected until the next time this scanning line is selected. - View Dependent Claims (15)
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16. An electro-optical device, comprising:
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a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels located at intersections of the scanning lines and the data lines;
a scanning-line driving circuit that outputs a first scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written and that outputs a second scanning signal synchronous with the first scanning signal and a pulse signal synchronous with the first scanning signal; and
a data-line driving circuit that cooperates with the scanning-line driving circuit and that outputs a data voltage to the data line corresponding to the pixel to which data is written, each of the pixels including;
a first switching transistor having one of a source terminal and a drain terminal coupled with the data line so as to be controlled by the first scanning signal;
a first capacitor having one electrode coupled with the other terminal of the first switching transistor;
a second capacitor having one electrode to which a power potential is applied;
a second switching transistor having one of a source terminal and a drain terminal commonly coupled with the other electrode of the first capacitor and the other electrode of the second capacitor so as to be controlled by the second scanning signal;
a drive transistor having a gate commonly coupled with the one terminal of the second switching transistor, the other terminal of the first capacitor, and the other terminal of the second capacitor, a source coupled with the one electrode of the second capacitor, and a drain coupled with the other terminal of the second switching transistor for storing, an electric charge corresponding to the data voltage in the second capacitor and for setting a driving current according to the electric charge stored in the second capacitor;
an electro-optical element that emits light with a brightness corresponding to the driving current; and
a control transistor that repeatedly interrupts a current path for the driving current under conduction control of the pulse signal for a period after the scanning line corresponding to the pixel to which data is written is selected until a next time this scanning line is selected. - View Dependent Claims (17)
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19. A method of driving an electro-optical device including a plurality of pixels located at intersections of scanning lines and data lines, a scanning-line driving circuit that outputs a scanning signal to the scanning lines so as to select the scanning line corresponding to a pixel to which data is written, and a data-line driving circuit cooperating with the scanning-line driving circuit that outputs data to the data line corresponding to the pixel to which data is written, the method comprising:
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a first step of outputting data to the data line corresponding to the pixel to which data is written;
a second step of storing the data supplied via the data line in a storage device owned by the pixel to which data is written to write the data;
a third step of causing a drive element owned by the pixel to which data is written to set a driving current according to the data stored in the storage device and to supply the driving current to a current-driven electro-optical element that emits light with a brightness corresponding to the driving current; and
a fourth step of repeatedly interrupting the current path for the driving current for a period after the scanning line corresponding to the pixel to which data is written is selected until the next time this scanning line is selected.
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20. A method of driving an electro-optical device including a plurality of pixels located at intersections of scanning lines and data lines, a scanning-line driving circuit that outputs a scanning signal to the scanning line so as to select the scanning line corresponding to a pixel to which data is written, and a data-line driving circuit cooperating with the scanning-line driving circuit that outputs data to the data line corresponding to the pixel to which data is written, the method comprising:
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a first step of outputting data to the data line corresponding to the pixel to which data is written;
a second step of storing an electric charge corresponding to the data supplied via the data line in a capacitor owned by the pixel to which data is written to write the data;
a third step of causing a drive transistor owned by the pixel to which data is written to set a driving current according to the electric charge stored in the capacitor and to supply the driving current to an electro-optical element that emits light with a brightness corresponding to the driving current; and
a fourth step of repeatedly interrupting the current path for the driving current for a period after the scanning line corresponding to the pixel to which data is written is selected until the next time this scanning line is selected. - View Dependent Claims (21, 22, 23)
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Specification