People with experience in LED display industry will find such an interesting phenomenon. Previously, LED display screens mostly used white LED packaging devices (white light), especially in the field of outdoor LED display. However, in recent years, in addition to white, black LED packaging devices (black lights) have increasingly appeared in the market, especially in the field of small-pitch LED display and stage background screen. What are the factors that make the light turn black from white? Why does the small-pitch LED display favor the black light?
What does the "white" white light mean? - High brightness suitable for long distance viewing
To understand the black light LED display, we must first understand the concept of white light. The LED is assembled from a plastic bracket and a chip. Because the brightness of the early chips was not high, engineers used a white bowl shaped plastic bracket to enhance the focus of reflection to ensure that the chips with low brightness achieved brighter results. However, the white light also has its drawbacks. When it comes to black and gray, his light-emitting diode color (white) also participates in the color to be expressed on the electronic display. This causes color distortion (no expression of black, gray, dark green, etc.). ). Engineers compensate for the lack of brightness of the wafers by losing color expression.
In the past, LED displays were mostly used in outdoor commercial advertising displays. Because of the long viewing distance, they have higher requirements for display brightness and can accept the loss of color to compensate for the brightness. However, nowadays, when the LED light emission brightness is getting larger and the high-density and small-pitch LED display screen is becoming mature, the LED lamp beads do not need to be white to achieve satisfactory results. At the same time, in order to meet people's requirements for image fidelity and improve the contrast ratio of LED display screens, CREE and NICHIA of foreign LED display packaging factories have first developed a black light, and domestic LED display packaging plants Lanke Electronics will use a black light technology. To achieve the ultimate, we have developed a black light that provides the darkest grade in the market.
Comparison of white light (left) and black light (right)
Black light "black" mean -? High-contrast color display richer <br> <br> performance results for the LED display, it means higher fidelity performance of the display, the better, but realistic The degree of good or bad is mainly determined by the two indicators of the contrast and color of the expressed image (the greater the contrast, the better, the more types of colors are better). Contrast refers to the measurement of the different brightness levels between the lightest and darkest blacks in the light and dark areas of an image. The larger the difference is, the greater the contrast is. The smaller the difference is, the smaller the contrast is and the higher the contrast is. Display vivid, rich colors, can support various colors.
For example, the brightness of one LED display is 500 cd/m2 in a full white screen state, and the brightness of a full black screen is 0.5 cd/m2, so the contrast of the screen is 1000:1. The current use of LED display devices from Lanke Electronics can increase the contrast by 40%.
The effect of contrast on visual effects is critical. Generally speaking, the greater the contrast, the clearer and more eye-catching the image, the brighter the colors, and the less contrast, which will make the entire screen gray (as shown above). High contrast is very helpful for image clarity, detail performance, and grayscale performance. In some black and white contrast text display, video display, high contrast LED display in black and white contrast, clarity, integrity and other aspects have advantages. Contrast has more influence on the dynamic video display effect. Because the light and shade conversion in the dynamic image is faster, the higher the contrast, the easier the human eye can distinguish the conversion process.
As a result, the entire display surface of a display screen made of black light exhibits an image that is excellently uniform, vibrant, and darker in color.
What does "black" in black light mean? - Non-reflective colors are more realistic
In addition to the high contrast brought about by the black light, it also brings with it an even better performance. It is not reflective. Because the PPA holder in the black LED lamp is black, because the black is non-reflective, that is, there is no reflective ability, the light is converted into other energy (such as heat energy) on the black object, so even when there is stray light At the time, the black PPA holder will absorb all of them, no longer reflect the stray light, thereby reducing the interference of stray light, so that the color is more realistic, there will be no cross-colored, trailing and each color mutual interference The phenomenon makes the color more pure, clear and more realistic.
Especially the LED stage background screen, due to the large number of projection lights in the stage environment, light and shadow staggered, will seriously affect the LED stage background screen display. In addition to the black light itself does not reflect light, Lanke electrons also through the surface atomization technology, so that the light diffuse reflection, making the use of black crystal LED display in the reflective light of the stage environment can still be clearly seen on the display image. Due to the above characteristics of the black crystal LED lamp beads, light from the various light sources on the stage can be prevented from interfering with each other, thereby increasing the black screen effect of the LED display and being unaffected by the brightness of the external environment, and the LED display made of black light. The screen can always keep the brightness level of the display color clear.
Every product has its own era. Under the demand of small pitch and high definition, the field of LED display is undoubtedly an era of black light.
