STMicroelectronics ALED1642GW LED Display Driver is a monolithic, low voltage, low current power 16-bit shift register designed for LED panel displays. The ALED1642GW guarantees 20V output driving capability allowing the user to connect several LEDs in series. In the output stage, sixteen regulated current sources provide from 3mA to 40mA constant current to drive the LEDs. The current is programmed through an external resistor and can be adjusted by 7-bit current gain register in two subranges. The brightness can be adjusted separately for each channel through a 12/16-bit grayscale control. A programmable turn-on and turn-off time (four different values are available) improves the system low noise generation performances.