No.8 Xinghu Road. Yutang Street
Guangming District, Shenzhen, China
This is a very interesting phenomenon in the LED display business. In the past, LED displays tended to use white LED packaging devices (white light), particularly in outdoor LED displays. In recent years, however, black LED packaging devices (black light) have also become more popular, particularly in the field of stage LED screens and small-pitch LED displays. What causes the light to turn black from white? Why are black LEDs preferred on small-pitch LED displays?
High brightness: It is suitable to long-distance view
Understanding white light is necessary to understand black light LED displays. LEDs are made from chips and plastic brackets. Engineers made early chips not very bright. They made the brackets into white bowl shapes to increase focused reflection. This ensured that the low-brightness of the chip would achieve a brighter result. White light has its own shortcomings. The white light emitting diode is also the color that the display will use to express black or gray. This causes color distortion. ). Engineers compensate for a lack of brightness in the chip by reducing color expression.
LED displays have been used for outdoor advertising displays in the past. It is okay to sacrifice color in order to achieve the required brightness due to the large viewing distance. As LEDs become brighter and smaller, they no longer require white LED lamp beads to produce satisfactory results.
CREE, NICHIA, and other LED display packaging producers were the first to create black lamps to improve contrast and meet the needs of people. China’s LED display packaging company like Nationstar offers the darkest black among all products.
Richer colors and high contrast display
The higher the fidelity of an LED display, the better its performance. It is determined primarily by the color and contrast of the image. (The more colors the better, the greater the contrast).
Contrast refers to the measurement of different brightness levels between the brightest white and the darkest black in the light and dark areas of an image. The larger the difference range, the greater the contrast. The smaller the difference range, the smaller the contrast. High contrast is easier to display vivid, rich colors.
For example, an LED display’s brightness is 500cd/m2 in its full-white screen state and 0.5cd/m2 in the full-black screen state. Hence,The contrast ratio is 1000:1. LED displays that use Nationstar black light devices can currently increase contrast by 40%.
Contrast is a critical factor in visual effects. In general, the higher the contrast the more clear and vibrant the colors and the better the clarity of the image. If the contrast is low, then the image appears gray. High contrast can be very useful for image clarity, grayscale expression, and detail expression.
High-contrast displays are better for text displays or video displays that have a large black-and white contrast. They also offer greater clarity and completeness. The contrast has a larger impact on the dynamic effects of video displays. The human eye can distinguish the conversion of dynamic images with greater ease if the transition between light and dark is relatively rapid.
The entire LED screen, which is made up of blacklight, can therefore present images with richer colors, deeper hues, and uniformity.
Colors that are non-reflective and more realistic
The black LED lamp bead is non-reflective, so it offers a high level of contrast. The PPA bracket of the black LED lamp is black. Because black is not reflective, light shines through the black bead and is converted to other energy, such as heat. The phenomenon of making colors clearer, more realistic and pure.
Due to the many colors of projection lighting in the stage environment the light and the shadow will be intertwined. This will affect the display of the LED stage screen. IAMLEDWALL uses surface atomization technology to diffuse the light so that LED displays using black devices are able to clearly see characters in a highly reflective stage environment.
The above characteristics of the black LED lamp beads allow for the avoidance of mutual interference between the light emitted from various light sources. This increases the black screen effect and does not depend on the brightness of external environments. LED displays using black lights will always maintain the brightness and darkness of the screen colors.
Black light SMD LED displays are now the norm used for indoor displays, where high contrast is preferred to high brightness. For outdoor displays, however, many engineering companies, vendors and customers have always believed that higher brightness is better.
This kind of thinking has led to LED displays exceeding 5000cd in brightness. This will not only lead to light pollution and a loss of owner approval (the standard brightness for outdoor LED displays is 5 000CD and when outdoor LED displays exceed this standard, they are considered light pollution), but it will also reduce viewing enjoyment and harm the visual experience of consumers. It will increase the owner’s operating costs and electricity bill at the same.
Contrast is more important than brightness for image clarity
Does the LED display need to be that bright? In fact, according to the original source, the main reason for increasing the brightness of LED screens is to make screen images, videos, and other content more visible to consumers. According to research, the human eye is more sensitive to color than light or dark. Cone cells and columnar cell make up the retinal cells of the human eyes. Each cone cell is attached to an optical nerve ending. This allows for high resolution and can distinguish colors and details.
While multiple columnar cell are connected to the optic nerve ending so the resolution is very low and can only be distinguished by the outline of the image. The human eye has a very wide range of brightness perception. However, once the eye becomes accustomed to a particular brightness environment, the range of its perception is limited. The cone cells that are responsible for color perception play an important role at this time.
Contrast, which determines color brightness, is therefore more important than brightness when it comes to determining subjective clarity.
In general, the higher the contrast the clearer the image and the more vibrant and colorful colors. The lower the contrast the grayer the entire image, making it hard for the eye to differentiate. The contrast of dynamic video effects is more important than other aspects. The conversion between light and dark in dynamic images happens relatively quickly, so the higher the contrast the easier it will be for the eye to discern this conversion.
LED black light displays are more contrasty than white light products
In outdoor environments, increasing the contrast on the LED display is more practical than blindly going for high brightness, which can cause light pollution and excessive energy consumption. This will improve the recognition of the displayed image. The greater the contrast under the same brightness will result in a more vivid and layered image. This will give consumers a better viewing experience.
According to test results, black light contrast ratio for outdoor LED displays is approximately 3000:1, whereas the contrast ratio for white lights outdoors is approximately 1000:1 (due to the strong ambient light outside, the background brightness is higher in the outdoor white light LED display than the test environment). The relative contrast will be lower. The black light LED display with bracket cups in black plastic and PPA is more uniform on the screen, and it can absorb external light.
Black light LED displays are more competitive in the outdoor LED advertising industry, which is focusing on energy conservation, light environment and emission reduction.
Each product belongs to a specific era. The LED display screen field, with its demand for high definition and small spacing, belongs undoubtedly to the black light era.