How is the grayscale of LED display screen achieved?
Publish Time: 2024-10-24
The grayscale of LED Display refers to the brightness change level of a single pixel from the darkest to the brightest, which is crucial for color reproduction and the presentation of image details.
In principle, the realization of grayscale of LED Display mainly depends on pulse width modulation (PWM) technology. PWM adjusts the brightness by controlling the ratio of the on and off time of LED lamp beads. For example, in a cycle, if the lamp beads are on for a long time and off for a short time, the human eye will see a brighter state; otherwise, it will be a darker state. By accurately controlling the on and off time of the lamp beads in each cycle, a variety of brightness levels can be generated, thereby achieving grayscale.
For color LED Display, the red, green and blue LED chips are independently controlled by this PWM control method. Because the brightness changes of each color are combined together, a variety of colors can be produced. For example, when the red LED is brighter, the green LED is at a medium brightness, and the blue LED is darker, a specific color is mixed.
In practical applications, the realization of grayscale also requires the use of high-quality driver chips. The driver chip can accurately adjust the duty cycle of PWM according to the control signal, that is, the ratio of the on and off time. Moreover, in order to better realize the grayscale level, the control system of the display screen also plays a key role. It will convert the input image signal into a grayscale control instruction for each pixel, send it to the driver chip, and then control the brightness of the LED lamp beads.
Different grayscale levels have a significant impact on the display effect. High grayscale levels mean richer brightness change levels, which can delicately restore the shadows, highlights and other details in the image, making the color transition more natural. For example, when displaying complex scenes such as natural scenery, high grayscale levels can make the gradient of the sky and the sparkling water surface vivid; while low grayscale levels may cause the color of the picture to be stiff and the details to be lost. For example, the black part may appear grayish, and the true texture of the image cannot be shown.
