What is the principle of scanning LED display?
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LED display - knowledge
Currently on the market of LED display driver method has two kinds of static scan and dynamic scan, static scan is divided into static compaction pixels and static virtual, dynamic scanning is also divided into dynamic realities and dynamic virtual;
Drive equipment usually has a 1/2, 1/4, 1/8, 1/16.
Appeared in a certain area, light up the number of rows and the whole area of rows together share, says scanning methods.
From the output of the driver IC feet to force between the pixels' point-to-point 'manipulation is called static drive, from the driver IC output pin to force between the pixels' point of column' manipulation is called scanning drive, can clearly see from the driven plate: static drive demand did not control circuit, high capital to teach, but work well, good stability, brightness loss taught, etc. ;
Scan line drive it needs control circuit, but capital is low, poor work, brightness lost a big, etc.
1, scanning operation principle is: the persistence of vision characteristic of human eyes, in a very short period of time will LED display all light respectively.
Time on the screen lights practice is not bright, but let's look is all lit;
For example: light up a indoor full-color 32 x16 8 sweep unit board, at 0.
001 seconds time, light up the number of lines as long as line 2, the rest is not bright, that is, and animation, film principle is the same, practice is the role of a piece of a picture, scanning speed immediately formed the animation effect.
2, commonly used scanning method has the following kinds: 1/16, 1/8, 1/4,
Indoor single and double color usually is 1/16 scanning, indoor full-color usually 1/8 scanning, outdoor single color is usually 1/4 scan, outdoor full-color usually static scan.
3, driving method has two kinds: constant current driving and constant voltage driver;
It was little more constant current circuit boards and chips allow current to adhere to the stability, increase the service life of the LED display and stability.