Advertising LED Displays are increasingly favored by the market due to their excellent brightness and color performance, as well as seamless picture integrity. However, in some cities, problems such as the high brightness of the LED Display that affect the lives and traffic of surrounding residents have also appeared. How to adjust the brightness and color of the LED Display, here, I will share a few tips for you.
One, Choice Of Primary Color Wavelength
LED Display screens are widely used in various industries, and different applications have different requirements for the wavelength of the primary color of the LED. Some of the wavelengths of the primary color of the LED are selected to achieve good visual effects, and some are to meet people’s needs. Habits, and some are more regulated by industry standards, national standards and even international standards.
For example, the choice of the wavelength of the primary color of the green tube in a full-color LED Display; in the early days, people generally used a yellow-green LED with a wavelength of 570nm. Although the cost is lower, the display has a small color gamut, poor color reproduction, and low brightness. After choosing a pure green tube with a wavelength of 525nm, the color gamut of the display screen has nearly doubled, and the color reproduction has been greatly improved, greatly improving the visual effect of the display screen. Another example is the stock market display screen. People are usually accustomed to using red to indicate stock price increases, green to indicate stock prices falling, and $ to indicate flat prices. In the transportation industry, the national standards strictly stipulate that the blue-green band means traffic, and the red band is prohibited. Therefore, the choice of primary color wavelength is one of the important links of LED Display.
Two, Brightness Adjustment
1. Modulate the pulse width, use the frequency of change that the human eye can feel, and use the pulse width modulation method to achieve grayscale control, that is, periodically change the light pulse width. Pulse width modulation is more suitable for digital control and has been widely used. The most common method is to adopt a microcomputer. At present, almost all LED Displays adopt pulse width modulation to control the gray level.
2. Ordinary LED tube allows a continuous task current of about 20 Am. By changing the current flowing through the LED, except for the saturation of the red LED, the brightness of the remaining LED’s is basically proportional to the current flowing.
Three, Adjustment Of White Field Color Coordinates
White field color coordinate adjustment is one of the most basic technologies for full-color LED Displays. However, in the mid-1990s, due to the lack of industry standards and basic testing methods, the white field color coordinates were usually determined by human eyes and feelings, resulting in serious color cast and random white field color temperature. With the promulgation of industry standards and the completion of testing methods, many manufacturers began to standardize the color matching process for full-color screens. However, due to the lack of theoretical guidance for color matching, some manufacturers often sacrifice the gray levels of certain primary colors to adjust the 100-field color coordinates, and the overall performance cannot be improved.
Four, Color Adjustment
The high-definition Advertising LED Display is displayed according to the principle of light’s three primary colors. Determining one of red, green, and blue as the reference is mainly based on the different brightness of the selected product red, green, and blue. Generally, the brightness reference is the one with a low brightness ratio. When the maximum brightness has been reached, another color needs to be adjusted for a two-color LED Display, and the other two colors of LED’s, etc., for a full-color LED Display.