Pixel, display device reducing static power consumption and driving method thereof

Abstract

Provided is a pixel driving circuit capable of reducing power consumed for pixel driving by reducing the number of times a capacitor is charged. The pixel driving circuit includes: a video memory configured to store video data related to driving of a plurality of light-emitting devices; a plurality of sub-pixel driving units, respectively corresponding to the plurality of light-emitting devices, configured to supply power to the plurality of light-emitting devices according to the video data stored in the video memory, each of the plurality of sub-pixel driving units having a capacitor unit for charging power required for driving each of the plurality of light-emitting devices; a charge control memory configured to store data related to charging of the capacitor unit; and a charge controller configured to control whether the capacitor unit is charged according to charge control data stored in the charge control memory.

1 . A pixel driving circuit comprising:
 a first memory configured to store image data related to driving of a luminous element;   a sub-pixel driver connected to the luminous element and configured to drive the luminous element according to the image data stored in the first memory, wherein the   sub-pixel driver includes a capacitor for charging power required for driving the luminous element; and   a second memory configured to store charging control data related to charging of the capacitor of the sub-pixel driver,   wherein the sub-pixel driver includes a charge controller configured to output a charging control signal according to the charging control data stored in the second memory so that   the capacitor is charged according to the charging control data, and   wherein the charging control data stored in the second memory is related to a number of charging times of the capacitor during one period.   
     
     
         2 . (canceled) 
     
     
         3 . The pixel driving circuit of  claim 1 , wherein
 the sub-pixel driver includes:   a cap charge unit connected between a pixel positive power and a pixel negative power; and   a cap discharge unit connected between the pixel positive power and the pixel negative power, and   the capacitor is connected between the cap charge unit and cap discharge unit.   
     
     
         4 . The pixel driving circuit of  claim 3 , wherein
 the sub-pixel driver   further includes a control switch connected between the cap charge unit and the capacitor.   
     
     
         5 . The pixel driving circuit of  claim 4 , wherein
 the control switch   is turned on or off by the charging control signal from the charge controller.   
     
     
         6 . (canceled) 
     
     
         7 . The pixel driving circuit of  claim 4 , wherein
 the sub-pixel driver includes another capacitor C2 parallelly connected to the capacitor C1,   the cap charge unit includes   a first cap-charge transistor and a second cap-charge transistor respectively connected to the C1 and C2 between the pixel positive power and the pixel negative power, and   the cap discharge unit includes   a first cap-discharge transistor and a second cap-discharge transistor respectively connected to the C1 and the C2 between the pixel positive power and the pixel negative power.   
     
     
         8 . The pixel driving circuit of  claim 7 , wherein
 the sub-pixel driver includes another control switch SW2 formed parallel path with the control switch SW1,   the SW1 is connected between the first cap-charge transistor and the C1 and wherein   the SW2 is connected between the second cap-charge transistor and the C2.   
     
     
         9 . The pixel driving circuit of  claim 8 , wherein
 the sub-pixel driver further includes   a third control SW3 connected between the first cap-charge transistor and the second cap-charge transistor.   
     
     
         10 . The pixel driving circuit of  claim 3 , wherein
 the sub-pixel driver unit further includes   a pulse width modulation (PWM) switch connected in series with the cap discharge unit between the pixel positive power and the pixel negative power,   the PWM switch is turned on or off according to the image data stored in the first memory.   
     
     
         11 . A display device comprising:
 a luminous element   a pixel driving circuit connected with the luminous element;   a scan driving circuit configured to sequentially output a row signal to the pixel driving circuit arranged in a row direction and   a data driving circuit configured to output a column signal related to driving of the luminous element to the pixel driving circuit arranged in a vertical direction,   wherein the pixel driving circuit includes:   a capacitor for charging power required for driving the luminous element;   a memory configured to store image data related to driving of the luminous element and charging control data related to charging of the capacitor; and   a charge controller configured to output a charging control signal according to the charging control data, and   wherein the capacitor is charged according to the charging control data which is related to a number of charging times of the capacitor during one period.   
     
     
         12 . The display device of  claim 11 , wherein
 the row signal and the column signal are signals having a data write period for the charging control data, a write period for the image data, and a period for pulse width modulation (PWM) driving every 1 period.   
     
     
         13 . The display device of  claim 11 , wherein
 the row signal and the column signal are signals having an image data write period and a PWM driving period every 1 period, after a signal having one charge control data write period is output.   
     
     
         14 . The display device of  claim 11 , wherein
 the row signal and the column signal are signals having an image data write period and a PWM driving period every 1 period, after a signal having a charge control data write period is output every preset period.