Driving of data lines used in unit circuit control
View Patent ↗The display matrix section 200 has pixel circuits 210 arranged in the form of a matrix, a plurality of gate lines Y 1 , Y 2 . . . that extend in the row direction, and a plurality of data lines X 1 , X 2 . . . that extend in the column direction. The scan lines are connected to a gate driver 300 , and the data lines are connected to a data line driver 400 . A pre-charging circuit 600 or additional current generation circuit is installed for each data line as means for accelerating the charging or discharging of the data line. For each data line, charging or discharging is accelerated by pre-charging or current addition prior to the completion of the setting of the light emission level in the corresponding pixel circuit 210.
1. An electro-optical device which is driven by an active matrix driving method, comprising:
a unit circuit matrix in which a plurality of unit circuits are arranged in the form of a matrix, each unit circuit including a light-emitting element and a circuit for adjusting an emission level of light to be emitted by the light-emitting element;
a plurality of scan lines which are respectively connected to the unit circuits, and which are arranged along a row direction of the unit circuit matrix;
a plurality of data lines which are respectively connected to the unit circuits, and which are arranged along a column direction of the unit circuit matrix;
a scan line driving circuit, connected to the plurality of scan lines, for selecting one row of the unit circuit matrix;
a data signal generating circuit for generating a data signal in accordance with the emission level of the light to be emitted by the light-emitting element, and outputting the data signal onto one data line selected from the plurality of data lines; and
a charging/discharging accelerating section which is capable of sequentially selecting one unit circuit from the plurality of unit circuits that is present in the row selected by the scan line driving circuit, and accelerating charging or discharging of a data line through which the data signal is supplied to the selected unit circuit, wherein
the light-emitting elements are current-driven type elements in which the light emission level depends on a current value flowing through the element,
each unit circuit comprises;
a driving transistor having a control electrode, the driving transistor being installed in a path of the current that flows through the light-emitting element, and
a storage capacitor, connected to the control electrode of the driving transistor, for setting the current value that flows through the light-emitting element by holding an electric charge that corresponds to an operating state of the driving transistor, and
wherein the accumulated charge in the storage capacitor is adjusted by the data signal.
2. An electro-optical device according to claim 1 , wherein the charging/discharging accelerating section includes a pre-charging circuit that is capable of pre-charging the plurality of data lines.
3. An electro-optical device according to claim 2 , wherein a single unit of the charging/discharging accelerating section is provided for all of the plurality of data lines.
4. An electro-optical device according to claim 2 , wherein the pre-charging circuit performs the pre-charging so that the data line is charged or discharged to a voltage corresponding to a low emission range that is equal to or less than a central value of the light emission level.
5. An electro-optical device according to claim 2 , wherein the pre-charging circuit performs the pre-charging so that the data line is charged or discharged to a voltage level corresponding to an emission range in the vicinity of a lowest non-zero light emission level.
6. An electro-optical device according to claim 2 , wherein the respective unit circuits are provided for each of a plurality of color components, and the pre-charging circuit performs the pre-charging so that the data line is charged or discharged to a different voltage level for each color component.
7. An electro-optical device according to claim 2 , further comprising a judgment circuit for judging a need to use the pre-charging circuit based on a voltage of the data line, which is subject to the pre-charging, at the start of the pre-charging of the data line.
8. An electro-optical device according to claim 7 , wherein the judgment circuit judges whether or not to perform the pre-charging with respect to each data line.
9. A piece of electronic equipment comprising the electro-optical device according to claim 1 .