Indoor fixed led display uses black led for better viewing

Indoor fixed led display uses black led for better viewing

Those with experience in the indoor fixed 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 indoor fixed LED screen displays and stage background screens. What is the factor that makes the light turn from white to black? Why do small-pitch indoor LED displays to 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. LEDs are assembled from plastic holders and chips. Due to the low brightness of the early chips, engineers have made the plastic holders 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, indoor fixed LED screen display screens were mostly used in outdoor commercial advertisements. Because of 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 indoor fixed led video wall 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 indoor LED display, foreign LED display packaging factory CREE, NICHIA first developed a black light, domestic LED display packaging factory Lanka Electronics will black light process To the extreme, we have developed a black light that provides the blackest level of the market.

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.

For example, an LED display has a brightness of 500 cd/m2 in a full white screen state and a brightness of 0.5 cd/m2 in a full black screen state, so that the contrast of the screen is 1000:1. LED displays currently using Lanco's electronic black crystal devices to increase contrast by 40%.

The effect of contrast on visual effects is critical. In general, the greater the contrast, the sharper the image, the more vivid the color, and the smaller the contrast, the more the picture will be grayed out (above). High contrast is very helpful for image sharpness, detail performance, and gray level performance. In some text display and video display with large black and white contrast, high-contrast LED display has advantages in black and white contrast, sharpness and integrity. Contrast has a greater impact on the dynamic video display. Because the light and dark transitions in the dynamic image are faster, the higher the contrast, the easier it is for the human eye to distinguish such a conversion process.

Therefore, in the display surface of the display screen made of black light, an image with uniform color, vitality and deeper color can be presented.

Not reflective, the color is more real

In addition to the high contrast, the black light brings another high-quality performance, that is, it is not reflective. Because the PPA bracket in the black LED lamp bead is black, since black does not reflect light, that is, there is no reflection ability, the light is converted into other energy (such as heat) on the black object, so even when there is stray light When the black PPA bracket absorbs all of it, it will no longer reflect the stray light, thus reducing the interference of stray light, making the color more realistic, without cross-color, smearing and color interference. The phenomenon, makes the color more pure, clear, and more realistic.

In particular, the LED stage background screen, due to a large number of projection lights in the stage environment, the light and shadow interlaced, will seriously affect the display effect of the LED stage background screen. In addition to the blacklight itself does not reflect light, Lanka Electronics also uses the surface atomization treatment technology to make the light diffusely reflect, so that the black crystal LED display can still clearly see the display on the display in the serious reflective stage environment. image. Due to the above characteristics of the black crystal LED lamp bead, the light emitted between various light sources on the stage can be prevented from interfering with each other, thereby increasing the black screen effect of the LED display screen and being unaffected by the brightness of the external environment, and the LED display by the black light is performed. The screen can always keep the brightness of the displayed picture clear and clear.

Every product has its own era. Under the demand of small pitch and high definition, the field of indoor fixed LED display is undoubtedly the era of black light.