In recent years, the LED display screen with excellent brightness and color performance, and free of flat-fell seam image of integrity, more and more get the favor of the market. However, also appeared in some cities due to the high brightness LED display affect the surrounding residents living, transportation, etc. How to adjust the brightness of the LED display and color? Here I share a few tips.
1, the 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. In full color LED display, for example, green tube gezer wavelength choice; Early generally choose the wavelength of 570 nm yellow-green LED, although the cost is low, but the display color gamut smaller, poor color reduction degree, low brightness. In choosing a wavelength of 525 nm, pure green tube display color gamut expanded nearly doubled, and the color reduction degree is greatly increased, greatly improve the visual effect of the display screen. Again, for example, stock screen, people usually accustomed to using the red rose, with green, says falling share prices, and with $said flat. In the transportation sector, it is stipulated by national standard strictly the blue green band pass, red light to stop. Therefore, gezer wavelength selection is one of the important link of LED display.
2, brightness adjustment
1, 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, namely the cyclical change light pulse width. Pulse width modulation is more suitable for digital control, which has been widely used, the most common method is to adopt microcomputer. Now almost all of the LED display is adopted PWM to control the grey scale.
2, 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.
The deployment of 3, white field color coordinate
White field color coordinate mixing is one of the most basic technology of full color LED display screen. But in the mid - 90 - s of the 20th century, due to lack of industry standards and the basic means of testing, usually just by eye, by feeling sure white color coordinates, thus causing serious partial color and white color temperature of randomness. With the promulgation of the industry standard and testing means complete, many manufacturers began to standardize the full color matching process. But there are some manufacturers because of the lack of color theory instruction, often at the expense of some primary grey scale to allocate the color coordinates, comprehensive performance cannot be improved.
4, color adjustment
LED display screen is to install HD 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.