Familiar people know that there are two ways to adjust the brightness of the full-color LED display: automatic adjustment and manual adjustment. Among them, the automatic adjustment is an intelligent brightness adjustment method that is adaptive according to the ambient brightness, and the manual adjustment method is implemented by software. So let ’s take a look at the software to adjust the brightness of the display screen.
The current software adjusts the brightness, which is generally 256 levels adjustable. In fact, the software is only an operation interface. What is changed by the operation of the software is the PWM duty cycle of the LED display driver to achieve the change in brightness.
Two methods to control the brightness of the LED display:
One is to change the current flowing through the LED display. Generally, the current allowed by the LED tube to work continuously is about 20ma. Except for the red LED which is saturated, the brightness of other LEDs is basically proportional to the current flowing; the other method is Utilizing the visual inertia of the human eye, using pulse width modulation to achieve grayscale control, that is, periodically changing the light pulse width (ie, the duty cycle), as long as the refresh frequency is high enough, the human eye cannot feel the luminous pixels are shaking . Since pulse width modulation is more suitable for digital control, today, with microcomputers commonly used to provide LED display content, almost all LED displays use pulse width modulation to control gray levels.
At present, the brightness of outdoor full-color LED display screens must be above 1500cd / m2 to ensure the normal operation of the display screen, otherwise the displayed image will not be clear because the brightness is too low. However, the brightness of many outdoor LED displays currently exceeds 5000cd / m2, and the playback effect is good during the day. However, such high brightness at night will cause serious light pollution and cause distress to nearby residents.
Therefore, it is very useful to determine the brightness of the LED display. It is necessary to adjust the brightness through software. It is also a common practice in the industry and it is an effective method. Generally, after the display project is completed, manufacturers will have special training for the software to help customers get started with management operations as soon as possible.
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