LED display brightness software transfer useful? We know that full-color display brightness adjustment methods are automatic adjustment and manual adjustment of two. Which is automatically adjusted according to the ambient brightness adaptive smart adjustment brightness mode, manual adjustment mode is achieved through the software, then through the software to adjust the brightness of the way useful?
The current software to adjust the brightness, generally 256 adjustable mode. In fact, the software is just a user interface, through the operation of the software eventually change the LED display driver PWM duty cycle, to achieve changes in brightness.
Here is an example to talk about how the duty cycle control brightness:
In a cycle T (T = Ton + Toff), duty cycle = Ton / T, increase Ton, then the average current flowing through the LED lamp increases, LED brightness increases, otherwise reduced Ton, the average current decreases Small, led brightness reduction.
Two ways to control led brightness:
One is to change the current flowing through the LED, the general LED tube allows continuous current at 20 mA or so, in addition to red LED saturation phenomenon, the other LED brightness is basically proportional to the current flowing; another method is to use The human eye is visually inert and uses the pulse width modulation method to achieve gray scale control, that is, periodically changing the width of the light pulse (ie, the duty cycle), as long as the repetition of the light cycle is short enough (ie, the refresh rate is high enough) The eye does not feel the luminous pixels in jitter. As the pulse width modulation is more suitable for digital control, so in the general use of microcomputer to provide led display content today, almost all of the led screen is to use pulse width modulation to control the gray level.
At present the outdoor full color LED display brightness to 1500cd / m2 or more, in order to ensure the normal work of the display, otherwise because the brightness is too low to see the displayed image. But now a lot of outdoor led screen brightness of more than 5000cd / m2 above, during the day and play better, to the evening prone to light pollution, causing trouble to the nearby residents.
So to determine the brightness of the LED display is very necessary, through the software to adjust the brightness is a must, but also the practice of the industry is a useful way. Also need to monitor the display manager with the daily control software and playback software operating capacity. Manufacturers in the display project is completed, will be specifically for the software training, the purpose is to help customers get started management operations as soon as possible.
The current software to adjust the brightness, generally 256 adjustable mode. In fact, the software is just a user interface, through the operation of the software eventually change the LED display driver PWM duty cycle, to achieve changes in brightness.
Here is an example to talk about how the duty cycle control brightness:
In a cycle T (T = Ton + Toff), duty cycle = Ton / T, increase Ton, then the average current flowing through the LED lamp increases, LED brightness increases, otherwise reduced Ton, the average current decreases Small, led brightness reduction.
Two ways to control LED brightness:
One is to change the current flowing through the LED, the general LED tube allows continuous current in 20 mA or so, in addition to red led saturation phenomenon, the other led brightness is basically proportional to the current flowing; another method is to use The human eye is visually inert and uses the pulse width modulation method to achieve gray scale control, that is, periodically changing the width of the light pulse (ie, the duty cycle), as long as the repetition of the light cycle is short enough (ie, the refresh rate is high enough) The eye does not feel the luminous pixels in jitter. As the pulse width modulation is more suitable for digital control, so in the general use of microcomputer to provide led display content today, almost all of the led screen is to use pulse width modulation to control the gray level.
At present the outdoor full color LED display brightness to 1500cd / m2 or more, in order to ensure the normal work of the display, otherwise because the brightness is too low to see the displayed image. But now a lot of outdoor led screen brightness of more than 5000cd / m2 above, during the day and play better, to the evening prone to light pollution, causing trouble to the nearby residents.