Summer is here, and girls are worried about smudged makeup when they go out. For every girl who loves beauty, smudged makeup is simply a destructive existence.
However, did you know that the LED display will also “dizzy makeup”!
What does the display screen with halo makeup look like? Let’s take an example.
△Left: severe color cast in the screen
Right: normal screen
The appearance of color cast and color blocks will cause the LED display to “dizzy”!
What is color cast?
Color cast refers to the phenomenon that one or more colors of the LED display are too strong or too weak, which makes the difference between the displayed color and the real color.
What happens to a color cast display?
The color cast will distort the display screen of the LED display, and the overall or partial reddish, greenish, blueish and other phenomena will appear. The unnatural color display will easily make the eyes tired and affect normal viewing.
What causes color cast?
LED bulb problem. Inconsistencies in LED lamp bead chip parameters, defects in packaging materials, position errors during crystal bonding, and errors in spectroscopic and color separation will all affect the light-emitting wavelength, brightness and angle of the same batch of LED lamp beads, resulting in color cast.
The production process is not rigorous. After the reflow soldering of the LED module, the position of the lamp bead has been fixed. If the production workshop does not have perfect protection conditions and the production process is not strict, workers are likely to encounter it during testing, aging, maintenance, etc. The LED lamp beads change the direction and position of the lamp beads, resulting in color cast of the module.
Working in high temperature environment for a long time. We all know that long-term work of the display screen will cause light decay, and high temperature will accelerate the light decay of the display screen. The attenuation values of the red, green and blue light-emitting chips are different. Therefore, under high-temperature working conditions, the display will experience a decrease in the brightness of the entire screen, color blocks, and color casts.
The service life of the LED display is not only determined by the service life of the lamp beads, but also by the display quality and life. The LED display used in the outdoor environment, under the catalysis of high temperature in summer, a little color cast and color blocks will greatly reduce the display quality, and the LED display is like “dizzy makeup”, not cool at all!
In order to ensure the color accuracy of the LED display and ensure its perfect display quality, when producing LED display modules, we will use high-quality lamp beads of the same batch and consistent wavelength;
The common cathode power supply method is adopted to reduce the temperature rise of the LED display, protect the internal components, reduce the light decay of the display, and effectively extend the life of the display quality!
What is the difference between the common cathode LED display and the conventional common anode LED display in terms of display quality?
In order to show the difference between the two most intuitively, we use Jiurun common shade cold screen PH5/PH5.93 and common anode display PH5/PH5.93 to carry out the color decay test comparison——
Test conditions: the ambient temperature is 28°C, the white balance is 255 levels of grayscale, and the display maintains the maximum brightness value.
Record the data every 3 minutes, the change relationship between the temperature rise of the display screen and the color gamut parameters such as brightness, white balance coordinates, and color temperature.
Data are as follows:
From the data in the table, we can see that with the change of time, the brightness of both the common cathode cold screen and the common anode display has decreased, and the brightness of the common cathode cold screen has a small change; while the brightness of the common anode display has a large change.
10 minutes after the start of the test, we observed the white balance screens of the two screens with the naked eye. It is not difficult to find that the temperature distribution of the common anode display is uneven due to the long-term high-temperature and high-brightness environment, which leads to temperature drift and the screen begins to appear color blocks (as shown below).
△Left: Co-anode display, temperature drift phenomenon of bluish and blue
Right: Common shade cold screen, the whole screen has the same color
Why are common cathode cold screens not prone to color casts and color blocks?
The common cathode cold screen adopts low voltage separate power supply mode, which effectively reduces the temperature rise of the screen, which is about 20 ℃ lower than the conventional screen temperature!
The common cathode cold screen has the characteristics of low temperature rise and low heat, the screen body is heated evenly, and the whole screen has good consistency;
The color temperature of the common shade cold screen is more constant, basically no color shift, and the picture effect will not be distorted after long-term use;
Low temperature and low heat can effectively protect the internal electronic components and improve the service life of components.
