Patent ID: 7825879
Filing Date: 2010-11-02
Classification: G09G

Abstract:
1. A display device, comprising: a pixel array unit and a driving unit which drives the pixel array unit, wherein the pixel array unit includes rows of first scanning lines and second scanning lines, columns of signals, pixels in a matrix state arranged at portions where the scanning lines and the signal lines cross each other and power supply lines and ground lines supplying power to respective pixels, wherein the driving unit includes a first scanner performing line-sequential scanning to pixels by each row by supplying a first control signal to each first scanning line sequentially, a second scanner supplying a second control signal to each second scanning line sequentially so as to correspond to the line-sequential scanning and a signal selector supplying a video signal to rows of signal lines so as to correspond to the line-sequential scanning, wherein the pixel includes a light emitting element, a sampling transistor, a drive transistor, a switching transistor and a pixel capacitor, wherein the sampling transistor is connected to the first scanning line at a gate thereof, connected to the signal line at a source thereof, connected to a gate of the drive transistor at a drain thereof, wherein the drive transistor and the light emitting element form a current path by being connected in series between the power supply line and the ground line, wherein the switching transistor is inserted into the current path and connected to the second scanning line at the gate thereof, wherein the pixel capacitor is connected between a source and a gate of the drive transistor, wherein the sampling transistor is turned on according to the first control signal supplied from the first scanning line and samples a signal potential of the video signal supplied from the signal line to be stored in the pixel capacitor, wherein the switching transistor is turned on according to the second control signal supplied from the second scanning line to allow the current path to be conductive, wherein the drive transistor allows drive current to flow in the light emitting element through the current path which is in the conductive state according to the signal potential stored in the pixel capacitor, wherein the driving unit, after turning on the sampling transistor by applying the first control signal to the first scanning line and starts sampling of the signal potential, gives correction with respect to mobility of the drive transistor to the signal potential stored in the pixel capacitor in a correction period from a first timing when the switching transistor is turned on by the second control signal being applied to the second scanning line until a second timing when the sampling transistor is turned off by the first control signal applied to the first scanning lines being cancelled, wherein the driving unit, at that time, adjusts the second timing automatically so that the correction period becomes short when the signal potential of the video signal supplied to the signal line is high, whereas so that the correction period becomes long when the signal potential of the video signal supplied to the signal line is low, wherein the drive transistor sets a size ratio W/L thereof to 0.5 or more when a channel width is W and a channel length is L, shortening the correction period as a whole by increasing supplying ability of drive current of the drive transistor during the correction period.