Is LED display brightness software adjustment useful? We know that there are two ways to adjust the brightness of the full-color display: automatic adjustment and manual adjustment. Among them, automatic adjustment is an intelligent way of adjusting the brightness adaptively according to the ambient brightness, and the manual adjustment method is realized by software, so is it useful to adjust the brightness through software?
At present, the software adjusts the brightness, generally 256-level adjustable way. In fact, the software is just an operation interface. The final change is the PWM duty cycle of the LED display driver through the operation of the software, and the brightness change is realized.
Here is an example of how the duty cycle controls the brightness:
In a cycle T (T=Ton+Toff), the duty cycle=Ton/T, increasing Ton, the average current flowing through the LED lamp will increase, and the LED brightness will increase, otherwise reduce Ton, the average current will decrease If it is small, the brightness of the led will decrease.
Two methods to control the brightness of LEDs:
One is to change the current flowing through the LED. Generally, the LED tube allows a continuous working current of about 20 mA. Except for the saturation of the red LED, the brightness of the other LEDs is basically proportional to the current flowing; the other method is to use The visual inertia of the human eye, the pulse width modulation method is used to achieve gray scale control, that is, the light pulse width (that is, the duty cycle) is periodically changed, as long as the repeated lighting period is short enough (that is, the refresh frequency is high enough), the human The eyes cannot feel the shaking of the light-emitting pixels. Because pulse width modulation is more suitable for digital control, today when microcomputers are commonly used to provide LED display content, almost all LED screens use pulse width modulation to control gray levels.
At present, the brightness of the outdoor full-color LED display must be above 1500cd/m2 to ensure the normal operation of the display. Otherwise, the displayed image will not be clear because the brightness is too low. However, at present, the brightness of many outdoor LED screens exceeds 5000cd/m2, and the playback is good during the day, and light pollution is prone to appear at night, which causes trouble to nearby residents.
Therefore, it is very necessary to determine the brightness of the LED display. Adjusting the brightness through software is a necessary method, and it is also a common practice in the industry and a useful way. In addition, it is necessary for the LED display manager to have the ability to operate daily control software and playback software. After the display screen project is completed, the manufacturers will have special training for the software, the purpose is to help customers get started with the management operation as soon as possible.
At present, the software adjusts the brightness, generally 256-level adjustable way. In fact, the software is just an operation interface. The final change is the PWM duty cycle of the LED display driver through the operation of the software, and the brightness change is realized.
Here is an example of how the duty cycle controls the brightness:
In a cycle T (T=Ton+Toff), the duty cycle=Ton/T, increasing Ton, the average current flowing through the LED lamp will increase, and the LED brightness will increase, otherwise reduce Ton, the average current will decrease If it is small, the brightness of the led will decrease.
Two methods to control the brightness of LEDs:
One is to change the current flowing through the LED. Generally, the LED tube allows a continuous working current of about 20 mA. Except for the saturation of the red LED, the brightness of the other LEDs is basically proportional to the current flowing; the other method is to use The visual inertia of the human eye, the pulse width modulation method is used to achieve gray scale control, that is, the light pulse width (that is, the duty cycle) is periodically changed, as long as the repeated lighting period is short enough (that is, the refresh frequency is high enough), the human The eyes cannot feel the shaking of the light-emitting pixels. Because pulse width modulation is more suitable for digital control, today when microcomputers are commonly used to provide LED display content, almost all LED screens use pulse width modulation to control gray levels.
At present, the brightness of the outdoor full-color LED display must be above 1500cd/m2 to ensure the normal operation of the display. Otherwise, the displayed image will not be clear because the brightness is too low. However, at present, the brightness of many outdoor LED screens exceeds 5000cd/m2, and the playback is good during the day, and light pollution is prone to appear at night, which causes trouble to nearby residents.
Therefore, it is very necessary to determine the brightness of the LED display. Adjusting the brightness through software is a necessary method, and it is also a common practice in the industry and a useful way. In addition, it is necessary for the LED display manager to have the ability to operate daily control software and playback software. After the display screen project is completed, the manufacturers will have special training for the software, the purpose is to help customers get started with the management operation as soon as possible.
