1. CGA display mode drives the advent of LED displays
In the early 1980s, with the development of computers, the CGA display method came out. It has four colors with a resolution of 320*200. In just 10 years, the display method has experienced CGA, EGA, SEGA, VGA, SVGA, Towards ultra-high resolution, the display accuracy has evolved from 320*200 to 1600*1250, from four colors to 32-bit true color, and the scanning frequency has evolved from 15.7K to 150K. The working principle of the display is to restore the signal from the host to display it in the form of light. With the development, people need a large-screen device, so a display device similar to a projector appears. However, due to its own brightness, it cannot be used in a high-brightness environment, so LED display screens appear again, which have the characteristics of large viewing angle, high brightness, and colorful colors.
2. Ultra-high brightness to achieve outdoor full-color display
Ultra-high brightness refers to LEDs with a luminous intensity of 100mcd or more, also known as candela-level LEDs. The development of high-brightness A1GaInP and InGaN LEDs is progressing rapidly, and has reached a performance level that conventional materials such as GaA1As, GaAsP, and GaP cannot reach. In 1991, Toshiba Corporation of Japan and HP Corporation of the United States developed the InGaA1P 620nm orange ultra-high-brightness LED. In 1992, the InGaA1p590nm yellow ultra-high-brightness LED was put into practical use. In the same year, Toshiba developed the InGaA1P 573nm yellow-green ultra-high-brightness LED with a normal light intensity of 2cd. In 1994, Nichia, Japan, developed an InGaN 450nm blue (green) color ultra-high brightness LED. At this point, the three primary colors of red, green, blue, orange and yellow LEDs required for color display have reached candela-level luminous intensity, achieving ultra-high brightness and full color, making the outdoor full color of the luminous tube The display becomes a reality.
3. Monochrome, dual primary colors to full color bring brilliant visual experience
LED display screens have gone from monochromatic, two-color graphic display to image display, but it was not until the mid-1990s that full-color screens appeared, regardless of the performance during the period (increased brightness LED display, blue light-emitting lamp, etc.) And the composition of the system (computerized full dynamic display system) and other aspects have made great progress. The level of ultra-high-brightness full-color video display that has been reached so far can be said to meet the requirements of various application conditions.
Up to now, full-color LED displays are widely used, consisting of red, green and blue LED lights, which can display white balance and 16,777,216 colors. The emergence of full-color technology has brought huge display breakthroughs to the image effect of LED displays. Nowadays, whether indoor or outdoor, the large LED screens used are basically full-color LED displays? The creativity is displayed to the greatest extent, bringing a very impactful visual experience to the audience.
Fourth, surface mount packaging technology continues to mature, and the scope of application is gradually expanding
In 2002, surface-mount packaged LED displays were gradually accepted by the market and gained a certain market share. Many manufacturers launched such products. In recent years, with the rapid development of three-in-one technology and the continuous improvement of production technology, surface mount packaging technology has developed rapidly. Compared with in-line packaging technology, surface mount technology has large viewing angles, good color consistency, and contrast. Good, light weight and many other advantages. In addition, the surface mount technology has a high degree of automation and can be directly used in SMT high-speed placement machines, which directly improves the production efficiency of the product and reduces the cost.
Before the advent of surface mount packaging technology, in-line technology became the mainstream of the LED display market. However, due to the difficulty of achieving high-density display, in-line LED displays can only be used outdoors, which greatly limits the LED display Penetration of the entire application market. The emergence of surface-mount packaging technology has undoubtedly promoted the application of LED displays in high-density indoor displays. With the advancement of LED chip technology and LED packaging technology, the brightness and protection level of surface-mounted LED displays have also been able to meet The demand for outdoor applications has achieved faster applications. It can be seen that surface mount packaging technology not only expands the application range of LED displays, but also has a trend to seize the entire LED display market.
5. Synchronous control system is favored to realize information timeliness
The screen synchronization control card is mainly used to display videos, graphics, and notifications in real time. Mainly used for indoor or outdoor full-color large-screen displays. The screen synchronization control system controls the working mode of the screen to be basically the same as that of a computer monitor. It maps the image on the computer monitor in real time with an update rate of at least 60 frames per second. It usually has the ability to display multi-gray colors. It can achieve the effect of multimedia advertising.
Compared with the asynchronous control card with limited playback information, the synchronous control card has the advantages of real-time, rich expression, more complicated operation, and high price, and can realize the complete synchronous display of the content on the computer monitor. This system is mainly used for Places with high real-time requirements are also favored by the current market.
6. Point-by-point correction system solves the problem of uneven brightness and chromaticity
The uniformity of brightness and chromaticity of LED display screens has always been a major problem that plagues the industry. It is generally believed that the uneven brightness of LEDs can be corrected by a single point to improve the uniformity of brightness, while the unevenness of chromaticity cannot be corrected. It can only be improved by subdividing and filtering the LED color coordinates.
As people’s requirements for LED displays are getting higher and higher, only subdividing and filtering the color coordinates of LEDs can no longer satisfy people’s critical gaze. Comprehensive correction of the display is achievable to improve the chromaticity uniformity. In 2010, it has gradually become an indispensable weapon for the control system to enter the market. The point-by-point correction system is a comprehensive set of software and hardware systems that can measure and correct each pixel on the LED display. This system can correct the brightness and chromaticity of each pixel on the entire screen to make it consistent Performance characteristics. For this reason, the world's advanced monochromatic brightness and chromaticity correction technology is used to solve the problem of color inconsistency caused by inconsistent attenuation of light-emitting diodes of different colors.
Seven, the advent of 4K technology promotes a new revolution in display
4K LED display specifically refers to an LED display with a resolution of 3840×2160 pixels. Its resolution is 4 times that of a 2K (1920x1080) LED display, and it can receive, decode, and display video signals of the corresponding resolution. At this resolution, the audience will be able to see every detail and close-up of the picture clearly, and get an immersive experience.
4K LED display has experienced nearly two years of development, and has become the first choice for consumers who desire high-definition LED display. The more delicate display details, more realistic textures and smoother smoothness brought by 4K LED display make Find a better way of presenting content. At the same time, in addition to improving the resolution of the 4K large screen, it has also driven a series of revolutions in related fields from shooting to display, especially the integration of 3D, VR/AR and other technologies with the LED large screen. It also brings the audience a full range of three-dimensional and real impact, and even can be equipped with interactive technology, through human screen interaction, allowing the audience to feel more shocking picture effects, it can be seen that 4K display technology makes the LED display display Competitiveness in the product field has become very strong.
8. The rise of glasses-free 3D technology, an overall upgrade of intelligence
In the field of LED display, it has developed from a flat screen to a three-dimensional 3D screen, which is also the biggest breakthrough in the development of display technology. The rise of naked-eye 3D display technology in 2013, as a hot display method in the current display field, has attracted the same attention as VR and AR. It is also a hot spot in the display field and is listed in the national "13th Five-Year" strategic plan. It is a strategic industry. Compared with ordinary 2D images, 3D is more three-dimensional and realistic, giving the audience an immersive feeling. At present, most of the glasses-free 3D technology is in the research and development stage, and is mainly used in the industrial commercial display market.
9. New breakthroughs in MINI technology. Small spacing ushered in a new era
Mini LED refers to a display screen that uses more sophisticated devices and new packaging methods to achieve 0.2-0.9 mm pixel particles. Mini LED display can solve the problems of easy damage of ultra-fine-pitch LED display, poor maintenance of COB products, and lower cost. It makes up for the shortcomings of SMD small-pitch LED and COB products, and has higher stability and reliability. At the same time, it has the characteristics of moisture-proof, wear-resistant, anti-static, easy to clean, efficient heat dissipation, and has a higher contrast and a more natural display effect.
Especially this year, the four-in-one technology has made a major breakthrough. Many companies in the industry have launched four-in-one MINI LED products, even claiming that it has the "best of both worlds" advantages of traditional surface mount and emerging COB technology. Promoted by the company, MINI LED will become the "dark horse" in the LED display market, leading the broader future of the new generation of LED small-pitch industry.
