Display device and method of driving the same
View Patent ↗A display device includes a driver circuit that controls so that an electric charge accumulation and a voltage detection/supply start simultaneously for a pixel circuit in a first row in the matrix and a pixel circuit in a second row in a matrix and adjacent to the pixel circuit in the first row in one direction along a column, and that controls so that the electric charge accumulation and the voltage detection/supply end simultaneously for the pixel circuit in the first row and a pixel circuit in a third row and adjacent to the pixel circuit in the first row in another direction along the column.
1. A display device comprising:
a plurality of pixel circuits, arranged in a matrix, each of which includes a light-emitting element that emits light with a luminance depending on an injected electric current, and a transistor that controls the electric current flowing through the light-emitting element, each of the pixel circuits performing prior to emission of light by the light-emitting element an electric charge accumulating operation in which a voltage between a gate and a source of the transistor is raised to a level higher than a driving threshold voltage of the transistor through accumulation of electric charges to a predetermined capacitor, and each of the pixel circuits performing a voltage detecting/supplying operation in which a voltage corresponding to the driving threshold voltage is detected/supplied between the gate and the source of the transistor through adjustment of the voltage between the gate and the source; and
a driver circuit that controls at least a timing of detection and supply of a voltage corresponding to electric charge accumulation and the driving threshold voltage in the pixel circuit, wherein
the driver circuit controls so that the electric charge accumulation and the voltage detection/supply start substantially simultaneously for a pixel circuit in a first row in the matrix and a pixel circuit in a second row in the matrix and adjacent to the pixel circuit in the first row in one direction along a column, and controls so that the electric charge accumulation and the voltage detection/supply end substantially simultaneously for the pixel circuit in the first row and a pixel circuit in a third row and adjacent to the pixel circuit in the first row in another direction along the column.
2. The display device according to claim 1 wherein
the driver circuit controls so that amounts of time differences in end timings of the electric charge accumulation and the voltage detection/supply between the pixel circuit in the first row and the pixel circuit in the second row are substantially equal to amounts of time differences in start timings of the electric charge accumulation and the voltage detection/supply between the pixel circuit in the first row and the pixel circuit in the third row.
3. The display device according to claim 1 , wherein
the light-emitting element has a characteristic that the light-emitting element emits light on receiving a supply of voltage in a forward direction which causes electric current in the light-emitting element, and accumulates electric charges corresponding to a level of supplied voltage on receiving a supply of voltage in a backward direction, and functions as the capacitance at the electric charge accumulation and the voltage detection/supply.
4. The display device according to claim 1 , wherein the light-emitting element is an organic light-emitting diode.
5. A method of driving a display device which includes plural pixel circuits, arranged in a matrix, each of which includes a light-emitting element that emits light with a luminance depending on an injected electric current and a transistor that controls the electric current flowing through the light-emitting element, and which is configured to accumulate electric charges to a predetermined capacitor and to employ the accumulated electric charges to detect/supply a voltage corresponding to a driving threshold voltage between a gate and a source of the transistor element prior to emission of light by the light-emitting element, the method comprising:
starting an electric charge accumulation and a voltage detection/supply substantially simultaneously for the pixel circuit arranged in a first row in the matrix and for the pixel circuit arranged in a second row adjacent to the first row in one direction along a column direction; and
stopping the electric charge accumulation and the voltage detection/supply substantially simultaneously for the pixel circuit arranged in the first row in the matrix and the pixel circuit arranged in a third row adjacent to the first row in another direction along the column direction.
6. The method according to claim 5 , wherein the light-emitting element is an organic light-emitting diode.