Large scale movie display system with multiple gray levels

A large scale electronic display board system for displaying images in response to an image signal, said system comprising:

• light emitting diode (LED) display for displaying images in multiple gray levels, said LED display being an N by M array of LEDs, where N and M are integers greater than or equal to 2, having a common ground and a common voltage source;
• and
• a current image circuit corresponding to each LED in said LED display for linearly controlling a gray level of said LED, each current image circuit comprising:
• a MOSFET large channel width transistor connected to said LED for lighting said LED in accordance with said image signal,
• a MOSFET control transistor connected to said large channel width transistor for supplying said image signal to said large channel width transistor in response to a control signal,
• a holding capacitor connected between a drain of said control transistor and said common ground for refreshing said image signal supplied to said large channel width transistor,
• a MOSFET small channel width transistor connected to said control transistor for supplying said image signal to said control transistor, said large channel width transistor having a channel width which is a multiple of a channel width of said small channel width transistor.