The two common ways to control LED display screen grayscale are pulse width modulation (PWM) and current modulation (AM).
1. Pulse Width Modulation (PWM): This method adjusts the grayscale by controlling the ratio of the LED’s power on time to the power off time. LED switches at a high frequency, and the power on time duty cycle within each cycle determines the brightness of the LED. Long power on time, brighter LED display; The power on time is shorter and the LED display is darker.
2. Current Modulation (AM): This method adjusts the grayscale by controlling the current level of the LED. By changing the current intensity of the LED, its brightness can be adjusted. A larger current will make the LED display brighter, while a smaller current will make the LED display darker.
Both methods can effectively control the grayscale of LEDs and are often used in LED displays, lighting systems, and other LED applications.