Display device, method for driving the same, and electronic device
View Patent ↗The present invention provides a display device, a method for driving the same, and an electronic device capable of making μ correction function reliably even in the case where light emission luminance is low. A potential difference between the gate and the source of a transistor is corrected to a threshold voltage of the transistor. After that, while a horizontal drive circuit outputs a third voltage Vofs 2 , correction of mobility of the transistor starts. Subsequently, while the horizontal drive circuit outputs a second voltage Vsig, writing of a voltage according to the second voltage Vsig to the gate of the transistor is started.
1. A display device comprising:
a display unit having a plurality of pixels with each pixel having (i) a light emitting element and (ii) a pixel circuit; and
a drive unit operable to drive the pixel circuits based on a video signal,
wherein,
each pixel circuit includes at least one transistor connected in series to the light emitting element, and
the drive unit includes,
(i) a first drive unit operable to supply a first voltage from a source or a drain of the transistor on the side opposite to the light emitting element, the first voltage being a voltage equal to or larger than a threshold voltage of the light emitting element, to the light emitting element,
(ii) a second drive unit operable to supply three different kinds of voltages to a gate of the transistor including (a) a second voltage having a magnitude based on the video signal and (b) a third voltage having a predetermined magnitude from the gate of the transistor and (c) a fourth voltage having a magnitude less than the third voltage, and
(iii) a control unit operable to (a) correct the potential difference between the gate and the source of the transistor to a threshold voltage of the transistor, (b) output a control signal a first time starting correction of mobility of the transistor while the second drive unit outputs the third voltage, and (c) output a control signal a second time starting writing of a voltage according to the second voltage to the gate of the transistor while the second drive unit outputs the second voltage.
2. The display device according to claim 1 ,
wherein the second drive unit is operable to change correction time by supplying the second, third, and fourth voltages in different orders.
3. A method of driving a display device with (i) a display unit having a plurality of pixels with each pixel having (a) a light emitting element and (b) a pixel circuit, and (ii) a drive unit operable to drive the pixel circuits based on a video signal, each pixel circuit includes at least one transistor connected in series to the light emitting element, the drive unit including (a) a first drive unit operable to supply a first voltage from a source or a drain of the transistor on the side opposite to the light emitting element, the first voltage being a voltage equal to or larger than a threshold voltage of the light emitting element, to the light emitting element, and (b) a second drive unit operable to supply three different kinds of voltages to a gate of the transistor including a second voltage having a magnitude based on the video signal, a third voltage having a predetermined magnitude from the gate of the transistor and a fourth voltage having a magnitude less than the third voltage, the method comprising:
correcting the potential difference between the gate and the source of the transistor to a threshold voltage of the transistor;
starting correction of mobility of the transistor while the second drive unit outputs the third voltage; and
starting writing of a voltage according to the second voltage to the gate of the transistor while the second drive unit outputs the second voltage.
4. The method according to claim 3 ,
changing correction time by supplying the second, third, and fourth voltages of the second drive unit in various orders.
5. An electronic device having a display device, the display device comprising:
a display unit having a plurality of pixels with each pixel having (i) a light emitting element and (ii) a pixel circuit; and
a drive unit operable to drive the pixel circuits based on a video signal,
wherein,
the pixel circuit circuits include at least one transistor connected in series to the light emitting element, and
the drive unit includes,
(i) a first drive unit operable to supply a first voltage of the at least three kinds of voltages from a source or a drain of the transistor on the side opposite to the light emitting element, the first voltage being a voltage equal to or larger than a threshold voltage of the light emitting element, to the light emitting element,
a second drive unit operable to supply three different kinds of voltages to a gate of the transistor including (a) a second voltage having a magnitude based on the video signal, (b) a third voltage having a predetermined magnitude from the gate of the transistor, and (c) a fourth voltage having a magnitude less than the third voltage, and
a control unit operable to (a) correct the potential difference between the gate and the source of the transistor to a threshold voltage of the transistor, (b) output a control signal a first time starting correction of mobility of the transistor while the second drive unit outputs the third voltage, and (c) output a control signal a second time starting writing of a voltage according to the second voltage to the gate of the transistor while the second drive unit outputs the second voltage.
6. The display device according to claim 5 ,
wherein the second drive unit is operable to change correction time by supplying the second, third, and fourth voltages in different orders.