EJ070NA-01J

    As businesses and the demand of the market, the LED display application is more and more widely. Two aspects of the development of things is always accompanied by a weakness, LED display merchants and customers to bring good advertising effect at the same time it still has some disadvantages, such as the citizens reflect more intense is the problem of high brightness LED display, LED display the sequela of too much brightness is mainly manifested in: 1, influence people of vision; 2, affect the driver's visual, easy to cause traffic accidents; 3, affect the quality of people's sleep; 4, lead to more serious light pollution and so on.

A, color adjustment
As we all know, LED display is display installation principle of three primary colors of light. We determine the red, green, and blue one of the three kinds of color as a benchmark is mainly according to the selection of product the brightness of the red, green, and blue color is different, generally as brightness benchmark is one of the low brightness proportion, a kind of when the benchmark has reached maximum brightness, for double color LED display is the need to adjust a different color, for full-color LED display, the color of the two other LED light can be adjusted.
Here we illustrate: for example, LED display screen is double color, in most case, it is green, adjust the working current of the red diode. General is to reduce working current to balance the color yellow to adjust the standard, this will reduce the whole LED display screen brightness. Adjust the color of the LED display to the best state of equilibrium will reduce the brightness of the screen. Don't will LED display each color maximum brightness, color imbalance. Such as double color screen slant yellow color red, or green.
Second, adjust the brightness
1, the common LED tube allows continuous mission at around 20 ma current, current through the LED by changing, besides red leds have saturation phenomenon, the rest of the LED brightness essentially proportional to the flow of current.

2, pulse width modulation (PWM), the use of the human eye can feel the change of frequency, pulse width modulation method is used to realize gray scale control, which is periodic change light pulse width. Pulse width modulation is more suitable for digital control, is widely used. Adopt microcomputer to provide the LED display is a common method. Now almost all of the LED display is adopted PWM to control the grey scale.

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