Years, LED display with excellent brightness and color performance, as well as no patchwork of screen integrity, more and more by the market’s favor. However, some cities also appeared due to LED display brightness is too high and affect the surrounding residents living, transportation and other issues. How to adjust the brightness and color of the LED display, here, share a few tips.
1, the choice of primary color wavelength
LED display in all walks of life has a very wide range of applications, and in different applications on the LED primary color wavelength has different requirements for the choice of LED primary wavelengths are some in order to achieve good visual effects, some in order to meet people’s Habits, and some are more industry standards, national standards and even international standards. For example, the full color LED display in the green tube primary color wavelength selection; early we generally use the wavelength of 570nm yellow-green LED, although the cost is low, but the display color gamut smaller, poor color reproduction, low brightness. And in the choice of the wavelength of 525nm pure green tube, the display color gamut expanded nearly doubled, and a significant increase in color reproduction, greatly improving the visual effects of the display. For example, the stock market display, people are often accustomed to using red that stock price rise, with green that stock price fell, and $ that flat plate. And in the transportation industry is strictly set by the national standard blue-green band that pass, the red band for the ban. Therefore, the choice of primary color wavelength LED display is one of the important links.
2, the brightness of the adjustment
1, modulation pulse width (PWM), the use of human eye can feel the frequency of change, the use of pulse width modulation method to achieve gray-scale control, that is, periodically change the optical pulse width. Pulse width modulation is more suitable for digital control, has been widely used, the most common method is to adopt microcomputer. Almost all of the current LED display is adopted pulse width modulation to control the gray level.
2, the ordinary LED tube to allow continuous task current in 20 mA or so, by changing the current flowing through the LED, in addition to red LED saturation phenomenon, the rest of the LED brightness is basically proportional to the current flow.
3, white field color coordinates of the deployment
White field color coordinate deployment is one of the most basic technologies of full color LED display. However, in the mid-1990s, due to the lack of industry standards and basic testing methods, usually only by the human eye, with the feeling to determine the white color coordinates, resulting in serious color cast and white color temperature arbitrariness. With the promulgation of industry standards and the completion of the means of testing, many manufacturers began to standardize the full color matching process. But there are still some manufacturers because of the lack of color theory of the guide, often at the expense of some of the primary color gray scale to deploy 100 color coordinates, comprehensive performance can not be improved.
4, the color of the adjustment
LED high-definition display is installed three primary colors of light display. Determine one of the colors of red, green and blue is mainly based on the brightness of the selected product red, green and blue, depending on the brightness of the general circumstances as a brightness reference is a low proportion of low, when the reference of a Has reached the maximum brightness, the two-color LED display on the need to adjust the other color, for full-color LED display is necessary to adjust the other two colors such as LED.