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HomeNewsPixel pitch knowledge point analysis of LED display

Pixel pitch knowledge point analysis of LED display

2019-05-08

A pixel of LED Display is a unit used to calculate a digital image. Like a photo taken, a digital image also has a continuous tone of lightness. If the image is magnified several times, it will be found that these continuous colors are actually small squares with similar colors. The dots are composed of the smallest unit "pixels" that make up the image. This smallest graphic unit can display a single coloring point on the led screen.

According to the color principle, it is known that red R, green G, and blue B are called three primary colors. These three colors can be combined to give any color from black to white. In the LED display classification, there are a monochrome display, a two-color led display, and a full-color led display. Monochrome is relatively simple, and only one of the three primary colors is required to achieve monochrome led display. In practical applications, there are more red LED lights. In this case, a red LED is a pixel.

The two-color led display is similar to the monochrome display. You can achieve two colors by selecting any two of the three primary colors. In practical applications, choose red and green. When both red and green are on, yellow can be achieved. Therefore, the two-color display can realize three colors of red, green and yellow.

Monochrome display LED illumination uses a solid semiconductor chip as a luminescent material. In the semiconductor, the carrier emits excess energy to cause photon emission, and directly emits red, yellow, blue, green, cyan, orange, purple, and white. Light.

Full-color LED displays need to be able to express different colors from black to white because they have to display a wide variety of colors. Therefore, the full-color LED display requires three lights of red, green and blue to form a single pixel, in order to display a variety of colors. In the full-color LED display, it is divided into a real pixel display and a virtual pixel display. Because the display technology used is different, the way pixels are formed is different.

The virtual pixel display adopts LED multiplexed virtual pixel technology, and adjacent LED light-emitting tubes can be combined to form one light-emitting tube through up, down, left and right four times; the real-pixel display screen adopts normal three primary colors to form one pixel technology. The points of the virtual pixels are scattered, and the points of the real pixels are condensed. The light-emitting point of the virtual pixel is between the tubes, and the light-emitting point of the real pixel is on the tube.

Let's take a look at the LED display pixel technology:

1. Dynamic pixel technology: split a pixel into several independent LED units. Each of the LED units reproduces corresponding primary color information of a plurality of adjacent pixels in a time division multiplex manner.

2. Virtual pixel technology: In the display system, when the displayed information is scrolled in a certain direction in a certain direction, a series of movements between two adjacent pixels are generated by utilizing the characteristics of the human short-lived visual effect. Virtual pixels that do not physically exist, thereby adjusting each LED single tube to enhance the resolution of the full color LED display to achieve the best image effect, the theory is to improve the image resolution, generally 4 times.

3. Pixel sharing technology: A complete independent pixel of the display terminal is time-division multiplexed, and is cyclically refreshed by information of multiple adjacent pixels in the signal source. It is understood that a plurality of pixels in the signal source share a complete independent pixel of the display terminal in a time division multiplexing manner.

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