JP2010008522A5 - - Google Patents

Claims (6)

A driving transistor that generates a driving current, a holding capacitor that holds information according to the signal amplitude of a video signal, an electro-optic element disposed on the output end side of the driving transistor, and information that corresponds to the signal amplitude in the holding capacitor And a pixel circuit that emits light from the electro-optic element when the drive transistor generates a drive current based on the information held in the storage capacitor and flows it through the electro-optic element. A pixel array unit,
A write scan pulse for scanning the pixel circuit by sequentially controlling the sampling transistors and writing information corresponding to the signal amplitude of the video signal to the storage capacitor is common to the control input terminals of the sampling transistors in the same row. And a horizontal driving unit for commonly supplying a video signal to the signal input terminals of the sampling transistors in the same column in accordance with the scanning in the writing scanning unit. And a control unit configured to function as a drive signal stabilization circuit that maintains the drive current constant.
The sampling transistor is connected in parallel so that a p-type transistor and an n-type transistor constitute a transfer gate,
The drive signal stabilization circuit is configured to realize a mobility correction function for adding a correction amount for the mobility of the drive transistor to a signal written to the storage capacitor under the control of the control unit,
The writing scanning unit is turned on first when the shift amount of each ON timing with respect to each signal potential supplied to each of the p-type transistor and the n-type transistor in the same row at the start of the mobility correction operation is smaller. And / or at the end of the mobility correction operation, the smaller the offset amount of each off timing with respect to each signal potential supplied to each of the p-type transistor and the n-type transistor in the same row, A display device that is controlled to be turned off later. When the mobility correction operation period is defined by a period from when the sampling transistor is turned on to when it is turned off, the writing scanning unit is configured to start the mobility correction operation at each p of the same row. Control is performed such that the one with the smaller shift amount of each on timing with respect to each signal potential supplied to the n-type transistor and the n-type transistor is turned on first, and at the end of the mobility correction operation, 2. The display device according to claim 1, wherein the display device is controlled so that the one with the smaller shift amount of each off timing with respect to each signal potential supplied to the p-type transistor and the n-type transistor is turned off later. The writing scanning unit
A shift register unit that generates a shift pulse serving as a reference for sequentially turning on and off the sampling transistors in each row;
The shift pulse output from the shift register unit is commonly used, and the p-type transistor is turned on by performing gate processing between the shift pulse and the control pulse for the p-type transistor that defines the shift amount. Gate processing between the shift pulse and the control pulse for the n-type transistor that defines the shift amount, and a first output gate section for generating a first write drive pulse for off / off control The display device according to claim 1, further comprising: a second output gate unit that generates a second write drive pulse for controlling on / off of the n-type transistor. A drive scanning unit configured to switch a first potential used to flow a drive current to the electro-optic element and a second potential different from the first potential and supply the first potential to a power supply end of the drive transistor; In addition,
The horizontal drive unit supplies a video signal switched between a reference potential and a signal potential to a signal input terminal of the sampling transistor,
The driving signal stabilizing circuit supplies a voltage corresponding to the first potential to the power supply terminal of the driving transistor under the control of the writing scanning unit, the horizontal driving unit, and the driving scanning unit. And a threshold correction function for holding the voltage corresponding to the threshold voltage of the drive transistor in the holding capacitor by conducting the sampling transistor in a time zone in which a reference potential in the video signal is supplied to the signal input terminal of the sampling transistor. The display device according to claim 1, wherein the display device is configured to realize the following. The drive signal stabilization circuit includes a threshold correction function for holding a voltage corresponding to the threshold voltage of the drive transistor in the holding capacitor, and a signal amplitude to the holding capacitor by conducting the sampling transistor after the threshold correction operation. The display device according to claim 1, wherein the display device is configured to realize the mobility correction function when writing information according to the function. The drive signal stabilization circuit is configured to realize a bootstrap function by connecting the storage capacitor between a control input terminal of the drive transistor and the drive current output terminal. The display device according to claim 1.