Electronic circuit, electro-optical device, method for driving electro-optical device and electronic apparatus
View Patent ↗A drive current corresponding to a digital-data voltage or an analog-data voltage transmitted via a data line can be transmitted to an organic EL element of a pixel circuit provided corresponding to the intersection of a scan line and the data line. The digital-data voltage can be transmitted to the pixel circuit so as to control gray scale by digital-gray-scale modulation for decreasing power consumption. Further, the analog-data voltage can be transmitted to the pixel circuit so as to control the gray scale by analog-gray-scale modulation for increasing the display quality.
1. An electro-optical device, comprising:
a plurality of scan lines;
a plurality of data lines provided so as to cross the plurality of scan lines;
a unit circuit that is provided so as to correspond to each of the intersections of the plurality of scan lines and the plurality of data lines and that transmits a drive current according to a data voltage transmitted via a respective data line of the plurality of data lines to an electro-optical element; and
a control device that generates and outputs either a two-level-data voltage for applying digital-gray-scale modulation to the electro-optical element or a multilevel-data voltage for applying analog-gray-scale modulation to the electro-optical element, based on image data, the control device including:
a two-level-data-voltage generation circuit that generates the two-level-data voltage for applying the digital-gray-scale modulation to the electro-optical element; and
a multilevel-data-voltage generation circuit that generates the multilevel-data voltage for applying the analog-gray-scale modulation to the electro-optical element,
the control device generating the two-level-data voltage for applying the digital-gray-scale modulation to the electro-optical element in low-electrical-power-consumption mode and the multilevel-data voltage for applying the analog-gray-scale modulation to the electro-optical element in non-low-electrical-power-consumption mode that drives the electro-optical element.
2. An electro-optical device, comprising:
a plurality of scan lines;
a plurality of data lines provided so as to cross the plurality of scan lines;
a unit circuit that is provided so as to correspond to each of the intersections of the plurality of scan lines and the plurality of data lines and that transmits a drive current according to a data voltage transmitted via a respective data line of the plurality of data lines to an electro-optical element; and
a control device that generates and outputs either a two-level-data voltage for applying digital-gray-scale modulation to the electro-optical element or a multilevel-data voltage for applying analog-gray-scale modulation to the electro-optical element, based on image data,
the control device generating the two-level-data voltage for applying the digital-gray-scale modulation to the electro-optical element in low-electrical-power-consumption mode and the multilevel-data voltage for applying the analog-gray-scale modulation to the electro-optical element in non-low-electrical-power-consumption mode that drives the electro-optical element,
the control device including, between the control device and each of the data lines, a first output circuit that outputs the two-level-data voltage transmitted from the two-level-data-voltage generation circuit and a second output circuit that outputs the multilevel-data voltage transmitted from the multilevel-data-voltage generation circuit, and a switching circuit that outputs either the two-level-data voltage from the first output circuit or the multilevel-data voltage from the second output circuit to the data line.
3. An electro-optical device, comprising:
a plurality of scan lines;
a plurality of data lines provided so as to cross the plurality of scan lines;
a unit circuit that is provided so as to correspond to each of the intersections of the plurality of scan lines and the plurality of data lines and that transmits a drive current according to a data voltage transmitted via a respective data line of the plurality of data lines to an electro-optical element; and
a control device that generates and outputs either a two-level-data voltage for applying digital-gray-scale modulation to the electro-optical element or a multilevel-data voltage for applying analog-gray-scale modulation to the electro-optical element, based on image data,
the digital-gray-scale modulation being time-ratio gray-scale modulation.
4. The electro-optical device according to claim 3 ,
the time-ratio gray-scale modulation being performed by writing the two-level-data voltage into the unit circuit corresponding to one of the plurality of scan lines selected in sequence and starting transmission of a current with a level according the two-level-data voltage to the electro-optical element at the same instant, and stopping the current transmission to the electro-optical element after a predetermined time.
5. A method for driving an electro-optical device, comprising:
a plurality of scan lines;
a plurality of data lines provided so as to cross the plurality of scan lines; and
a unit circuit that is provided so as to correspond to each of intersections of the plurality of scan lines and the data lines and that transmits a drive current according to a data voltage transmitted via a respective data line of the plurality of data lines to an electro-optical element,
the electro-optical element being driven by generating a two-level-data voltage for applying digital-gray-scale modulation to the electro-optical element in low-electrical-power-consumption mode and a multilevel-data voltage for applying analog-gray-scale modulation to the electro-optical element in non-low-electrical-power-consumption mode.
6. A method for driving an electro-optical device, comprising:
a plurality of scan lines;
a plurality of data lines provided so as to cross the plurality of scan lines; and
a unit circuit that is provided so as to correspond to each of intersections of the plurality of scan lines and the data lines and that transmits a drive current according to a data voltage transmitted via a respective data line of the plurality of data lines to an electro-optical element,
the electro-optical element being driven by generating a two-level-data voltage for applying digital-gray-scale modulation to the electro-optical element when image data is first display data and a multilevel-data voltage for applying analog-gray-scale modulation to the electro-optical element when the image data is second display data whose display quality is higher than that of the first display data.
7. The method for driving an electro-optical device according to claim 5 ,
the digital-gray-scale modulation being time-ratio gray-scale modulation.
8. The method for driving an electro-optical device according to claim 7 ,
the time-ratio gray-scale modulation being performed by writing the two-level-data voltage into the unit circuit corresponding to one of the plurality of scan lines selected in sequence and starting transmission of a current with a level according the two-level-data voltage to the electro-optical element at the same instant, and stopping the current transmission to the electro-optical element after a predetermined time.
9. An electronic apparatus, comprising:
an electro-optical device, the electro-optical device including:
a plurality of data lines;
a plurality of unit circuits;
a first data-voltage output circuit that outputs a two-level-data voltage as a data signal to each of the plurality of unit circuits via a respective data line of the plurality of data lines; and
a second data-voltage output circuit that outputs a multilevel-data voltage to each of the plurality of unit circuits via a respective data line of the plurality of data lines.
10. An electro-optical device, comprising:
a plurality of scan lines;
a plurality of data lines provided so as to cross the plurality of scan lines;
a unit circuit that is provided so as to correspond to each of the intersections of the plurality of scan lines and the plurality of data lines and that transmits a drive current according to a data voltage transmitted via a respective data line of the plurality of data lines to an electro-optical element; and
a control device that generates and outputs either a two-level-data voltage for applying digital-gray-scale modulation to the electro-optical element or a multilevel-data voltage for applying analog-gray-scale modulation to the electro-optical element, based on image data,
the control device generating the two-level-data voltage for applying the digital-gray-scale modulation to the electro-optical element when the image data is first display data and the multilevel-data voltage for applying the analog-gray-scale modulation to the electro-optical element when the image data is second display data whose display quality is higher than that of the first display data that drives the electro-optical element.