Patent ID: 9343007
Filing Date: 2016-05-17
CPC Classification: G09G

Claim Text:
1. A method to control charging and discharging M scan lines of an LED display, wherein each scan line(N) is electrically coupled to a corresponding USW(N) and a corresponding DSW(N), wherein each of said M and N is a nature number and 1<=N<=M, the scan line(N) represents the N th scan line of the LED display to be scanned, the USW(N) represents an upper switch that is electrically coupled to a first voltage reference for charging the scan line(N) when the upper switch is turned on, and the DSW(N) represents a down switch that is electrically coupled to a second voltage reference for discharging the scan line(N) when the down switch is turned on, the method comprising: turning on the USW(N) to charge the scan line(N) for a first time interval; turning on the DSW(N) to discharge the scan line(N) for a second pre-determined time interval; turning off the DSW(N) after the second pre-determined time interval is elapsed; and turning on USW(N+1) to charge the scan line(N+1) for a third time interval, wherein the second pre-determined time interval is shorter than the third time interval, wherein the scan line(N+1) represents the scan line that will be scanned immediately following the scan line(N), and the USW(N+1) represents the corresponding upper switch of the scan line(N+1).