Introduction: As people's requirements for screen display become more and more demanding, small-pitch LED displays, as a display device with high-definition display, delicate pictures, and large-screen display effects, are generally used in many different indoor areas. Today Winbond Ying Optoelectronics will share with you the technical analysis of indoor small-pitch LED displays.
Five core technologies of small-pitch LED display
1. Reduce the dead light rate of the display lamp to ensure the stability of the screen
Le taux de lumière morte des écrans LED traditionnels est de un sur des dizaines de milliers dans la norme de l'industrie, mais les petits écrans LED à petit-pas sont temporairement incapables de le faire. Selon les normes précédentes, il y aura 1 lumière morte sur 10 000 mètres carrés. L'affichage est presque illisible. Par conséquent, le taux de lumière morte de l'écran LED à petit-pitch doit être contrôlé à un cent millième ou même un millionième afin de répondre aux besoins d'une utilisation à long-terme. Sinon, si un grand nombre de lumières mortes apparaissent sur une période de temps, l'utilisateur ne sera jamais acceptable.
2. Realize low brightness and high gray
Beaucoup de gens savent que les lampes à induction du corps humain sont différentes des écrans extérieurs qui nécessitent une luminosité élevée, un taux de rafraîchissement et des exigences d'économie d'énergie. Les écrans d'intérieur doivent réduire la luminosité. Des expériences montrent que du point de vue de la sensibilité de l'œil humain, LED (source de lumière active) La luminosité est le double de celle d'une source de lumière passive. En termes de données spécifiques, la meilleure luminosité pour les LED à petit-pas entrant dans la pièce est de 200-400 cd/m2. Cependant, la perte d'échelle de gris-provoquée par la réduction de la luminosité doit être complétée par des compléments techniques. Lors d'une exposition organisée par Winbond en 2016, le réseau de performances d'affichage sur grand écran-a publié des échantillons de test de LED à petit pas et a fourni des méthodes et des normes de test. Des tests ont montré que seuls quelques fabricants d'écrans LED peuvent atteindre simultanément une faible luminosité et un gris élevé, la plupart des fabricants doivent parvenir à une certaine amélioration.
Écran LED d'intérieur à petit-espacement
3, standard resolution with signal source
Contrairement aux affichages extérieurs, les annonceurs extérieurs choisiront un contenu et un affichage appropriés en fonction de la résolution de l'affichage. Les sources de signal d'affichage intérieur ont certaines normes. En tant que fabricants d'écrans LED, ils ne peuvent pas exiger l'accès aux sources de signaux intérieures. Doit s'adapter à la résolution de l'écran d'affichage, mais pour s'adapter aux besoins des sources de signal intérieures, concevoir et garantir la résolution correspondante, de manière à répondre au mieux aux besoins des utilisateurs. Heureusement, après plus d'un an de compréhension des produits d'affichage LED d'intérieur et des besoins des clients, Winbond a achevé cette transformation et a largement répondu aux besoins des utilisateurs.
4. Support multi-signal and complex signal system access and display control
Comparé au signal d'affichage extérieur, l'affichage du signal d'affichage LEDE à petit-pitch se caractérise par un accès multi-signal et un accès complexe au signal. Par exemple, les visioconférences à plusieurs endroits nécessitent des signaux d'accès à distance, des signaux d'accès locaux et une utilisation multi-personnes. Access, des expériences ont montré que la simple mise en œuvre d'un accès multi-signal via la solution d'écran partagé- réduira les normes de signal. Par conséquent, la façon de résoudre le problème de l'accès aux signaux multi-et complexes nécessite une assistance technique de la part des LED à petit-pas.
5. Realize seamless stitching and high-speed correction
The biggest advantage of small-pitch LED display is seamless, but it has higher requirements when splicing. For liquid crystals, as long as the seams are uniform, there is no problem, and the seams are not obvious. However, the small spacing of LEDs cannot be so. If the modules are squeezed too tightly, bright lines will appear, and dark lines will appear when the modules leave. So it is not easy to splice well. Therefore, the process and calibration technology of the cabinet, as well as the guarantee and good combination of efficiency, need to be given a certain guarantee.
Small-pitch LED display scanning method
Dynamic scanning: Dynamic scanning implements "point-to-column" control from the output of the driver IC to the pixel points. Dynamic scanning requires a control circuit, and the cost is lower than static scanning, but the display effect is poor and the brightness loss is greater.
Static scanning: Static scanning implements "point-to-point" control from the output of the driver IC to the pixels. Static scanning does not require a control circuit, and the cost is higher than dynamic scanning, but the display effect is good, the stability is good, and the brightness loss is small And so on.
Écran LED d'intérieur à petit-espacement
With the development of LED technology, the brightness of LED electronic display screens has also been continuously improved, and the size has become smaller and smaller, which indicates that more LED small-pitch electronic display screens will become a general trend in the room.
However, due to the improvement of the brightness and pixel density of the small-pitch LED display, the control and driving of the small-pitch LED display also brings new and higher requirements. As far as general indoor screens are concerned, the current general control methods all use the row and column sub-control mode, which is commonly referred to as the scanning mode. At present, the driving modes of the LED small-pitch display screen are static scanning and dynamic scanning. Divided into static real pixels and static virtual, dynamic scanning is also divided into dynamic real image and dynamic virtual;
In the LED small-pitch display screen, the ratio of the number of lines lit at the same time to the number of lines in the entire area is called the scanning mode. The scanning is divided into 1/2 scan, 1/4 scan, 1/8 scan, 1/16 scan and other driving modes. That is to say, the driving mode of the display screen is different, so the setting of the receiving card is also different. If the receiving card was originally used on a 1/4 scan screen, but now it is used on a static screen, the display on the screen will be lit up every 4 lines. Generally, the receiving card can be set up. After connecting the sending card, display screen, computer and other major devices, you can enter the relevant software on the computer to set it up. So here is the first to introduce the scanning mode and principle of the LED small-pitch display.
HD small-pitch led screen display principle
LED screen display resolution (so-called spatial resolution), in the LED video display, it is closely related to the distance or pitch between pixels;
LED screen maximum brightness: dynamic brightness range is understood as the number of screen brightness levels that can be supported (sometimes called radiation or energy resolution);
LED screen frame rate is usually a measure of the new data display that a video source can feed the entire frame, and the frequency of frame changes per second (fps) (sometimes called time resolution);
The number of LED screen refresh rates (in Hertz) is to draw data on the second display hardware, or refresh the frame (also called time resolution);
LED screen spectral resolution: color image distinguishes light of different spectra. Multispectral image resolution requires even better wavelengths than different spectrums or duplicate colors. This term determines how many spectral components create an image; color uniformity across the entire screen; white balance and the possibility of fine-tuning;
LED screen linear brightness perception-subjective image quality, quality determines the human eye to distinguish between the dark and light parts of the adjacent brightness level on the screen;
LED screen image contrast; image quality depends on the viewing angle. In addition to image quality, it is important to consider some key operating parameters for LED video display.
