LED screens produce different colors on each pixel, mainly relying on the following key technologies and principles:
1. Three primary colors principle
LED screens use red (R), green (G), and blue (B) LED lights as basic units. These three colors are called three primary colors. By adjusting the brightness of these three color LEDs, most colors in nature can be combined. According to the principle of color mixing, the superposition of red, green, and blue light of different intensities can produce a variety of colors from black to white.
2. RGB LED light combination
At each pixel, there is a combination of LED lights containing red, green, and blue. These LED lights are connected and controlled by precise circuits, and the brightness of each color can be adjusted independently. When the three colors of light are mixed in a certain proportion, the desired color can be presented at the pixel.
3. Driving and control technology
LED screens use dedicated driving circuits and control systems to achieve precise control of the color of each pixel. The driving circuit usually uses pulse width modulation (PWM) technology to adjust the LED brightness by adjusting the effective period and duty cycle of the current. The control system is responsible for receiving and parsing data from the video source or image source, converting this data into control signals to drive the LED lights to display according to the predetermined color and brightness.
4. Virtual pixel technology (optional)
In some high-end LED screens, virtual pixel technology is also used to further improve the display effect. Virtual pixel technology controls the light emission mode of LED lights through software algorithms, so that adjacent LED lights can participate in the imaging of multiple pixels. In this way, the resolution and display effect of the screen can be improved without increasing the number of actual LED lights. However, it should be noted that virtual pixel technology is not used in all LED screens.
5. Optical lens synthesis method (specific application)
In some special applications, such as micro displays or projection equipment, optical lens synthesis method may also be used to achieve full-color display. This method uses an optical prism to synthesize the red, green and blue LED lights into full-color light, and projects them onto the screen through a lens to form an image. However, this method is not common in large LED screens.
In summary, the different colors produced by LED screens on each pixel mainly depend on factors such as the principle of three primary colors, the combination of RGB LED lights, and the driving and control technology. Through the comprehensive application of these technologies, LED screens can present colorful, vivid and realistic images and video effects.