What are the adjustment methods of LED display color

Time:2018-10-06 Views:522

LED display is increasingly favored by the market with its outstanding brightness and color performance, as well as the picture integrity without stitching.However, some cities also have problems in the life and traffic of surrounding residents due to the high LED display brightness.How to adjust the brightness and color of the LED display, here are a few tips from deroncel (www.zhangchongshun.cn).

Gezer wavelength selection: LED display has a very wide application in all walks of life, and gezer wavelength of LED in the application of different places have different requirements, LED gezer wavelength selection for some of them are in order to obtain a good visual effect, some of them are in order to comply with the habits of people, and some is the industry standard, national standard, and even the rules of the international standard.For example, the choice of green tube base color wavelength in full-color LED display;In the early stage, people generally chose yellow-green LED with a wavelength of 570nm. Although the cost is low, the color range of the display is small, the color restoration degree is poor and the brightness is low.However, after selecting a pure green tube with a wavelength of 525nm, the color range of the screen has been nearly doubled, and the color restoration degree has been greatly improved, which greatly improves the visual effect of the screen.For example, on the stock market display, people usually use red to indicate rising stock prices, green to indicate falling prices and $to indicate flat prices.In the transportation industry, the blue and green band is strictly stipulated by the national standard, and the red band is prohibited.Therefore, the choice of base color wavelength is one of the important links of LED display.

2. Brightness adjustment:

1. Modulate the pulse width. The change frequency that human eyes can feel is used.Pulse width modulation is more suitable for digital control and has been widely used.At present, almost all LED displays adopt pulse width modulation to control the gray level.

2. The ordinary LED tube allows the continuous task current to be about 20 milliamperes. By changing the current flowing through the LED, except that the red LED is saturated, the brightness of other LED is basically proportional to the current flowing through it.

3. White field color coordinate 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, the white field color coordinates were usually determined by human eyes based on their senses, resulting in serious color bias and random white field color temperature.With the promulgation of industrial standards and the completion of testing means, many manufacturers began to standardize the full color screen color matching process.However, due to the lack of theoretical guidance of color matching, some manufacturers often sacrifice the grey level of some primary colors to adjust the color coordinate, and the comprehensive performance is not improved.

Color adjustment: the hd LED display is displayed according to the principle of three primary colors of light.Determine one red, green, and blue 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 scale, when the benchmark a has reached the 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.