Discussion on Application and Development of LED Display

With the maturity of LED display technology, more and more users of enterprises and institutions begin to choose LED screens, and its development trend is also a concern for these users. Based on the author’s experience, this article provides some reference opinions on the application and development trend of LED displays. The large-screen display has always been the focus of the industry and users. In recent years, the development of large-screen displays has made great progress from projection and splicing to LED. It has dropped significantly and is preferred by more industries. Military institutions, government departments, transportation and transportation, radio and television, energy departments, public security, urban management, advertising media, finance and logistics, stage backgrounds, etc. can all see LED displays.

The advantages of LED display technology

LED is the abbreviation of (Light-Emitting Diode, organic light-emitting diode), and the advantages of LED display technology are as follows.

Adopt self-illumination: the three primary colors of red, green, and blue in each pixel are generated by the light-emitting diode self-illumination, which is no longer the backlight and color filter used by LCD to generate the three primary colors, and its colors are extremely bright and beautiful.

Wide viewing angle: It can reach a wide-screen viewing angle of 160°/140° (horizontal/vertical), and the screen will not change when viewed in almost any direction.

Very high contrast ratio: The contrast ratio is almost infinitely high, which can present a very deep black field-deep black, while LCD still has shimmer (light leakage) when displaying a black field due to its backlight.

Very high contrast ratio: The contrast ratio is almost infinitely high, which can present a very deep black field-deep black, while LCD still has shimmer (light leakage) when displaying a black field due to its backlight.

Extremely high response speed: The response speed in nanoseconds is an order of magnitude higher than that in LCD milliseconds, and there is almost no smearing.

Ultra-high brightness: It is especially suitable for outdoor use, and the only choice for outdoor advertising display at present.

Extremely high lifespan: The theoretical lifespan of LED lamp beads is 100,000 hours, and the outdoor 24h all-weather use can reach 5 years.

The very high number of colors: the number of colors of the full-color screen can reach 1.07 billion colors, its colors are extremely rich, and the color gamut is ≥100% NTSC color gamut。

Very high grayscale number: it can reach 65536 levels. That is, 216, and the black and white picture level is very wide.

The size of the display screen can be spliced at will: it can be arbitrarily spliced into an infinite-size LED screen, both flat and curved。

Broad lighting field: LED lamp beads are widely used in home lighting, landscape lighting, street lighting, etc.

Convenient maintenance: single-point or module maintenance and replacement can be carried out, and the maintenance time of the trained engineer is ≤2min.

The composition of the LED display system

There are generally three types of display methods for large screens: the first method is to use multiple LCD or DLP monitors to form a TV wall, that is, a splicing screen, and then form a splicing screen system with a splicing controller, AV matrix, and RGB matrix; The second method is to use multiple high-brightness projectors and use edge fusion technology to form a splicing screen system; the third method uses LED screens, which are spliced and combined through LED modules, which can be spliced into any size and shape at will, including surface, etc.

The first method has a lower cost of purchasing equipment, but there will be splicing gaps, and the screen will feel divided; the second method has higher maintenance costs in the later period, mainly because the projector adopts a dual-lamp system, and the life of the lamp is only 4000~6000h, The cost of replacing the lamp is high, and the projector cannot be moved after it is positioned. The third way is that the cost of purchasing equipment is relatively high at present, but it is rarely maintained in the later stage. Even if the maintenance is to replace the module, the replacement time is short and the module is cheap.

Now, large-screen displays are gradually transitioning from splicing screens to LED displays. A typical LED display system includes: an LED display screen, LED display control system (LED Display Control System), LED display control card, and control software and peripheral devices.

LED display screen body: It is composed of several 16×16 modules spliced and assembled, which are fixed and formed by the box body.

LED display control system: Obtain data from the computer graphics card and assign it to the scanning board. The scanning board is responsible for controlling the rows and columns of the LED screen, and cascade transmission through each display control unit in a serial manner, so as to realize the whole screen display.

Video source card: Receive analog signal sources such as cameras, video players, TV signals, etc. and convert them into digital signals, and then process them through the computer in the control system.

LED display system function

Partition display: Each sub-area independently displays one channel of video, which can be video or computer signals, without interfering with each other.

Full-screen display: The entire screen only displays one video and displays it in high resolution.

Special display: multi-screen display, arbitrary zoom, overlay display, cross-screen movement, etc.

Application of LED Display System

As a large-screen display technology, LED display systems have been widely used in related industries: military institutions, government departments, transportation and transportation, radio and television, energy departments, public safety, urban management, advertising media, finance and logistics, and stage backgrounds.

Prospect of LED display system

Market Status

There are about 50 companies with LED display application sales exceeding 100 million yuan in the whole industry. There are about 20 companies with annual sales of 200 to 500 million yuan. The full-color LED display industry is a sunrise industry and a green industry at the same time, and it is an industry vigorously promoted by the State Council.

After rapid development in recent years, my country’s full-color LED display has a large scale, its products occupy an absolute market in China, and also occupy a certain share in the global market, forming a stable export. Its product quality, reliability, and stability have been significantly improved.

The technological difference between full-color LED displays and foreign countries, such as Sony, is gradually narrowing, and the basic and international development is synchronized. With the continuous strengthening of innovation and research and development capabilities, the development of key technologies and mainstream products has become relatively mature.

Future Technology Outlook

The performance improvement and the price civilianization can make the screen extra large. In large business districts, large outdoor advertisements, and large stages, large screens are used to attract the attention of the audience.

High-definition and high-density. It can allow the audience to obtain a more realistic and delicate 4K viewing effect, especially the sudden emergence of high-density and small-pitch LED displays, which represents the trend of future development.

The LED display is energy-saving. The use cost (electricity fee) can be saved for later use, but various indicators need to be optimized, which requires the joint efforts of the upstream and downstream industry chains of the entire industry.

Intelligent LED full-color screen. The combination of a full-color screen and intelligence, especially AI intelligence, enables real-time interaction between people and the screen, which is a brand-new user experience and has a huge market in the advertising field. At present, it has a prototype and needs to be further improved.

Further thinning. The lightness and thinness of the full-color screen are conducive to transportation, installation, and maintenance, reducing the load on the exterior wall of the building, increasing safety, and at the same time reflecting the aesthetics.

Conclusion

This article introduces the application and development of LED displays. As the industry and users pay more and more attention to the development and application of LED displays, as its performance continues to improve and costs continue to decline, more industries and users will use LEDs. Display, LED display will also establish its due position and role in the field of large-screen display, I hope the author’s introduction can provide some help for readers.