Familiar people know that there are two ways to adjust the brightness of a full-color LED display: automatic adjustment and manual adjustment. Among them, the automatic adjustment is an intelligent adjustment method of brightness that is adaptive to the ambient brightness, and the manual adjustment method is realized through software, so let's see if it is useful to use software to adjust the brightness of the display screen?

The current software to adjust the brightness is generally 256-level adjustable. In fact, the software is just an operation interface. The PWM duty cycle of the full-color LED display driver is finally changed through the operation of the software to realize the change of brightness.

Two ways to control the brightness of a full-color LED display:

One is to change the current flowing through the full-color LED display. Generally, the current allowed by the LED tube to work continuously is about 20ma. Except for the saturation phenomenon of the red LED, the brightness of other LEDs is basically proportional to the current flowing; the other is The method is to use the visual inertia of the human eye and use the pulse width modulation method to achieve grayscale control, that is, to periodically change the light pulse width (ie duty cycle), as long as the refresh frequency is high enough, the human eye cannot feel the light-emitting pixels. shaking. Because pulse width modulation is more suitable for digital control, almost all full-color LED displays use pulse width modulation to control gray levels today when microcomputers are generally used to provide LED display content.

At present, the brightness of the outdoor full-color LED display should be more than 1500cd/m2 to ensure the normal operation of the display, otherwise the displayed image will be difficult to see because the brightness is too low. But at present, the brightness of many outdoor full-color LED displays is more than 5000cd/m2, and the playback effect is good during the day, but such high brightness will be lost at night.

Causes serious light pollution, causing trouble to nearby residents.

Therefore, it is very necessary to determine the brightness of the full-color LED display. Adjusting the brightness through software is a necessary method, and it is also a common practice in the industry, which is an effective method. Generally, after the completion of the full-color LED display project, manufacturers will have special training for the software, the purpose is to help customers get started with management operations as soon as possible.