With the advancement of full color LED display technology, the pixel pitch is becoming smaller and smaller. According to industry consensus, a small LED display with a pixel pitch below 2.5mm is a small LED display. Usually, choose a small LED display, you can consider the following aspects:
1. Higher fill factor
The fill coefficient of the LED display is also called the light area ratio, which is the ratio of the luminous area of each pixel to the physical surface area of the pixel.
The full color LED display is composed of discrete pixels, and there is an obvious black between pixels. When viewed from a close distance, the picture is not coherent and complete. and the brightness is uneven, resulting in a particle sense. If the light source is limited to a very small pixel surface area, resulting in the brightness of a single pixel is several times or even more than ten times that of the whole screen. It will cause a more serious glare. According to the TCO’99 standard, the filling coefficient of flat panel display should not be less than 50%. At present, the filling coefficient of many LED displays in the market doesn’t meet this index. Cut off characteristics of the TV low pass filter, directly affect the appropriate shooting distance of full-color LED display with different filling coefficients.
For the same pitch of LED display, the attenuation of a small filling coefficient is more than that of a large filling coefficient, so the shooting distance needs to be increased. If the low-pass filter passband of the system is 4MHz and the attenuation characteristic of high frequency is 12dB / octave, the shooting distance of 25% filling coefficient will be 1.15db more than that of 50% filling coefficient, and the shooting distance needs to be increased by about 10%. With the increase of filling coefficient, the perspective of full-color LED display screen is wider, and the effect of color mixing is more ideal, which overcomes the dazzling problem of pixels, and creates conditions for properly improving the brightness of the whole screen to obtain a better effect.
2. Color temperature can be adjusted
When the full-color LED screen is used as the background in the studio, its color temperature should be consistent with the color temperature of the light in the studio, so as to get accurate color reproduction in the shooting. According to the program requirements, sometimes 3200K low color temperature lamps are used, sometimes 5600k high color temperature lamps are used, and the LED display needs to be adjusted to the corresponding color temperature, so as to obtain satisfactory shooting effect.
3. Shooting distance should be appropriate
The appropriate shooting distance is different for LED displays with different pitch and filling coefficient. The distance between the person to be photographed and the screen is 4-10 meters, which is more suitable, so that when shooting the person, you can get a better background picture. If the characters are too close to the screen, the background will be grainy and prone to interference.
4. Ensure a good use environment
The failure rate of the product is low only under proper working conditions in the service life. As an integrated electronic product, an LED display is mainly composed of a control board with electronic components, switching power supply, light-emitting devices, etc., and the life and stability of all these components are closely related to the working temperature. If the actual working temperature exceeds the specified service range of the product, not only its service life will be shortened, but also the product itself will be seriously damaged. In addition, when working in a dusty environment, the PCB absorbs dust, and the deposition of dust will affect the heat dissipation of electronic components, which will cause the temperature of components to rise, and then the thermal stability to decline or even generate leakage, which will cause burning in serious cases. Dust also absorbs moisture, which corrodes electronic circuits, causing some short circuit problems that are not easy to troubleshoot. Pay attention to keep the studio clean.
So, when purchasing small spacing LED products, what key points should users pay attention to in order to maximize the investment benefits on the premise of meeting the user needs?
- Low brightness and high gray “are the premise
First of all, we need to ensure the comfort of watching, so when purchasing, the primary concern is the brightness. Relevant research shows that in terms of human eyes, to ensure the comfort of human eyes, the brightness range of small pixel LED display can only be between 100cd / m2 and 300cd / m2.
However, in the traditional LED display technology, reducing the brightness of the screen will cause the loss of gray level, and the loss of gray level will directly affect the image quality. Therefore, an important judgment standard of high quality and small pixel LED display is to achieve the technical index of “low brightness and high gray”. In the actual procurement, users can follow the principle of “the more brightness levels that can be recognized by human eyes, the better” 。 Brightness level refers to the brightness level that the human eye can distinguish from the darkest to the whitest image. The more brightness levels are recognized, the larger the color gamut space of the display screen is, the greater the potential of displaying rich colors is.
- Pay attention to balance “effect and technology”
Compared with the traditional LED screen, the prominent feature of small pixel LED screen is smaller pitch. In practical application, the smaller the distance between points, the higher the pixel density, the more information capacity per unit area can be displayed at one time, and the closer the distance suitable for viewing is. On the contrary, the farther the distance suitable for viewing is. Many users naturally think that the smaller the distance between points of products they choose, the better. However, this is not the case.
Traditional LED screen wants to achieve the best visual effect, with the best viewing sight distance, the same is true for small pixel LED display. Users can simply calculate the best viewing distance =pixel pitch / 0.3 ~ 0.8, for example, the best viewing distance of P2 small pixel LED screen is about 6 meters away.
We know that the smaller the pixel pitch is, the higher the cost of small pixel LED display is. Therefore, in the actual purchase, users should consider their own cost, demand, application range and other factors.
- Select the resolution, and pay attention to the matching with “front-end signal transmission equipment”
The smaller the pixel pitch of the small LED display screen is, the higher the resolution is, so the sharper the picture is. In the actual operation, users want to install the best small LED display. While paying attention to the resolution of the screen itself, they also need to consider the matching with the front-end signal transmission products.
For example, in the security monitoring application, the front-end monitoring system generally includes D1, H.264, 720p, 1080i, 1080p, and other formats of video signals. However, not all the small LED displays on the market can support the above formats of video signals. Therefore, in order to avoid the waste of resources, users must purchase the small LED displays on-demand Seek choice, avoid blindly catching up with the trend.
At present, small LED display has been widely used in the TV studio, power system monitoring center, Aerospace Command Center, military command center, government affairs hall, city monitoring center, video conference room, control room, airport, railway station, hotel, large and medium-sized enterprises, and other occasions.
