Display device, method for driving the same, and electronic device
View Patent ↗A display device includes: a display unit including first and second lines, light emitting elements and pixel circuits; a first drive unit sequentially applying a selection pulse to the first lines; and a second drive unit applying a signal pulse including first to third voltages to each of the second lines. Each of the pixel circuits includes a first transistor sampling the signal pulse, and a second transistor driving one of the light emitting elements. The first drive unit applies the selection pulse when the first voltage is being applied by the second drive unit, before a correction of a threshold voltage of the second transistor is initiated and within a period that the one of the light emitting elements is being turned out, and the first drive unit applies the selection pulse when the second voltage is being applied by the second drive unit.
1. A display device, comprising:
a display unit including a plurality of first lines arranged in rows, a plurality of second lines arranged in columns, a plurality of light emitting elements arranged in the rows and in the columns, and a plurality of pixel circuits arranged in the rows and in the columns;
a first drive unit configured to sequentially apply a selection pulse to the plurality of first lines; and
a second drive unit configured to apply a signal pulse having a first voltage, a second voltage, and a third voltage to each of the second lines, the first voltage being higher than the second voltage, and the third voltage being same as a voltage corresponding to a video signal,
wherein
each of the pixel circuits includes a first transistor configured to sample the signal pulse, and a second transistor configured to drive a corresponding one of the light emitting elements,
the first drive unit applies the selection pulse to the first lines while the first voltage is being applied to each of the second lines by the second drive unit, before a correction of a threshold voltage of the second transistor is initiated and within a period in which the corresponding one of the light emitting elements is being turned out, and
the first drive unit thereafter applies the selection pulse to the first lines while the second voltage is being applied to each of the second lines by the second drive unit.
2. A method, comprising the steps of:
providing a display device including:
a display unit having a plurality of first lines arranged in rows, a plurality of second lines arranged in columns, a plurality of light emitting elements arranged in the rows and in the columns, and a plurality of pixel circuits arranged in the rows and in the columns;
a first drive unit configured to sequentially apply a selection pulse to the plurality of first lines; and
a second drive unit configured to apply a signal pulse having a first voltage, a second voltage, and a third voltage to each of the second lines, the first voltage being higher than the second voltage, and the third voltage being same as a voltage corresponding to a video signal,
wherein each of the pixel circuits includes a first transistor configured to sample the signal pulse, and a second transistor configured to drive corresponding one of the light emitting elements;
applying, by utilizing the first drive unit of the display device, the selection pulse to the first lines while the first voltage is being applied to each of the second lines by the second drive unit, before a correction of a threshold voltage of the second transistor is initiated and within a period in which the corresponding one of the light emitting elements is being turned out; and
applying, by utilizing the first drive unit of the display device, the selection pulse to the first lines while the second voltage is being applied to each of the second lines by the second drive unit.
3. An electronic device, comprising a displaying device including:
a display unit having a plurality of first lines arranged in rows, a plurality of second lines arranged in columns, a plurality of light emitting elements arranged in the rows and in the columns, and a plurality of pixel circuits arranged in the rows and in the columns;
a first drive unit configured to sequentially apply a selection pulse to the plurality of first lines; and
a second drive unit configured to apply a signal pulse having a first voltage, a second voltage, and a third voltage to each of the second lines, the first voltage being higher than the second voltage, and the third voltage being same as a voltage corresponding to a video signal,
wherein
each of the pixel circuits has a first transistor configured to sample the signal pulse, and a second transistor configured to drive corresponding one of the light emitting elements,
the first drive unit applies the selection pulse to the first lines while the first voltage is being applied to each of the second lines by the second drive unit, before a correction of a threshold voltage of the second transistor is initiated and within a period in which the corresponding one of the light emitting elements is being turned out, and
the first drive unit thereafter applies the selection pulse to the first lines while the second voltage is being applied to each of the second lines by the second drive unit.
4. The display device of claim 1 , wherein a difference between the first voltage and the second voltage is large enough to reduce a probability of occurrence of black dots on the display unit.
5. The method of claim 2 , wherein a difference between the first voltage and the second voltage is large enough to reduce a probability of occurrence of black dots on the display unit.
6. The electronic device of claim 3 , wherein a difference between the first voltage and the second voltage is large enough to reduce a probability of occurrence of black dots on the display unit.
7. The electronic device of claim 3 , is at least one of a television device, a digital camera, a notebook-sized personal computer, a video camera, and a cellular phone.