Those with experience in the LED display industry will find such an interesting phenomenon. Most of the previous LED displays used white LED package devices (white lights), especially in the field of outdoor LED displays. However, in recent years, in addition to white, black LED package devices (black lights) have appeared on the market more and more, especially in the field of small-pitch LED displays and stage background screens. What is the factor that makes the light turn from white to black? Why do small-pitch LED displays favor black lights?
What does "white" of white light mean?
——High brightness for long distance viewing
To understand the black LED display, you need to understand the concept of white light. The LEDs are assembled from plastic brackets and chips. Due to the low brightness of the early chips, engineers have made the plastic brackets into a white bowl shape to enhance the focusing and reflection, so as to ensure that the chips with low brightness achieve a brighter effect. But white light also has shortcomings. When it is black or gray, his light-emitting diode color (white) also participates in the color to be expressed on the electronic display, which produces color distortion (cannot express black, gray, dark green, etc.) ). Engineers compensate for the lack of brightness in the form of loss of color expression.
In the past, LED display screens were mostly used in outdoor commercial advertisements. Due to the long viewing distance, there is a high requirement for the brightness of the display screen, and it is acceptable to accept the loss of color to compensate for the brightness. However, nowadays, when the brightness of the LED is getting larger and larger, and the high-density and small-pitch LED display is becoming more and more mature, the LED lamp bead does 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 of LED display, foreign LED display packaging factory CREE, NICHIA first developed a black light, domestic LED display packaging factory Lanke Electronics will black light process To the extreme, we have developed a black light that provides the blackest level of the market.
Contrast effect diagram of white light (left) and black light (right)
What does the "black" of the black light mean?
- High contrast display color is more abundant
For the performance of the LED display, the higher the fidelity, the better the performance of the display, and the quality of the fidelity is mainly determined by the contrast between the expression image and the color (the greater the contrast, the better). The more colors, the better.) Contrast refers to the measurement of different brightness levels between the brightest white and the darkest black in the dark and dark areas of an image. The larger the difference range is, the larger the contrast is. The smaller the difference range is, the smaller the contrast is, the higher the contrast is. Display vivid, rich colors to support all levels of color.
Contrast will directly affect the grayscale performance of the LED display
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