With the advent of the 5G era, ultra-high-definition video display and ultra-high-speed signal transmission will inevitably put forward higher technical requirements for display products, and this will inevitably include increased requirements for interactivity—touch functions. To discuss how to make the display screen "at your fingertips" at close range, you first need to make the display screen meet several characteristics of the use scenario for close viewing:
The first is the fineness of the picture when viewed at close range
In the past, traditional large-screen displays were mainly used for outdoor long-distance display. Generally, outdoor large-screen displays have the characteristics of large pixel particles and large pixel spacing, while close-range interactive display scenes require more detailed screen display; typical conference display In the scene, the controller is usually tens of centimeters away from the screen, and the viewer is about 3-5m away from the screen. In such a close-up scene, if there is no good picture fineness, the audience will only gain a poor viewing experience.
Then there is the heat problem of the screen for a long time
As we all know, the screen is a big heat sink, and the larger the screen, the more heat dissipation. Therefore, to achieve a close-range interactive experience of the large screen, the first thing to solve is the heat dissipation problem of the large screen, not because the screen is used for a long time, the air temperature near the screen When it rises, people will have a burning sensation when they are close to watch or touch.
The other is the safety issue of watching the screen up close
As an interactive display, the biggest feature of its use scene is close viewing and touch control. For close viewing and touch operation interactive display screens, the brightness of the screen should not be too high, and the light emitted by the screen should be as soft as possible. Reduce long-term use of irritation and harm to human eyes.
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Judging from the current technical route, interactive large-screen products mainly include smart laser screen products with backlight display and LED display products with self-luminous display (large-size LCD screens cannot achieve better cost control, so display on large-size screens) Weak competitiveness in the field). In terms of product form, the smart laser screen product is a mature indoor interactive large screen product. The product adopts backlight display technology. The screen is composed of a whole piece of composite material with tempered glass as the base material. The surface of the screen is as flat as a mirror. It's just suitable for human touch operation; and LED display as an interactive display is a new application scenario that has been developed after the development of technology in the past one or two years. At present, LED display is used as an interactive display, usually using MINI/MICRO LED Based on display technology, interactive touch display is realized by laminating the screen surface to achieve a flat and smooth screen surface.
From the perspective of specific technical characteristics, due to the current use of a more advanced laser projector as the display light source, the smart laser screen is more prominent in the display effect of close viewing. In the actual demonstration effect, the image quality of the smart laser screen Clear and delicate, rich and full of details (up to 4K resolution in daily life); and due to the use of rear projection display technology, the light emitted by the laser light source needs to be reflected multiple times before reaching the screen. When looking directly at the screen at close range, you can also have a better viewing experience. When watching, the audience can clearly feel that each pixel of the screen is arranged compactly without gaps, and the display light of each pixel is soft and not glaring, and The smart laser screen itself is not a heat source (heating is mainly generated by the backlight light source, but the backlight light source-laser display projectors are usually designed with two cooling systems, air cooling cycle and water cooling cycle, which can quickly take away from the smart laser screen cabinet system Heat to prevent temperature rise), even if the screen is turned on for a long time, the screen surface can always be kept near the body temperature suitable for human touch and control. For the audience, because the screen is a cold screen at room temperature that does not generate heat, the screen and The temperature near the screen will not increase abnormally, so it is also conducive to the audience to watch and appreciate at close range.
However, the interactive display using MINI/MICRO LED display technology will inevitably expose the shortcomings of using MINI/MICRO LED display technology to view the interactive screen at close range.
Primul lucru de subliniat este defectul afișajului interactiv MINI/MICRO LED la vizualizarea de aproape. După cum știm cu toții, tehnologia de afișare MINI/MICRO LED folosește mărgele individuale ale lămpii LED ca pixeli ai ecranului. Această caracteristică este utilizată atunci când vizionați de la distanță. Nu există nicio problemă, dar dacă există un decalaj fizic între fiecare șirag de lampă cu LED atunci când vizionează la distanță apropiată, publicul trebuie doar să acorde puțină atenție și va găsi brusc un șirag de lampă LED. Finețea imaginii la distanță apropiată este imediată. În același timp, deoarece fiecare lampă LED mică este o sursă de lumină independentă de sine-luminoasă, atunci când este privită la distanță apropiată, lumina directă puternică va pătrunde direct în ochiul uman, care va provoca cu ușurință oboseală ireversibilă și leziuni ale ochiului uman.
At the same time, as mentioned above, if the LED display wants to be interactive, it must improve the fineness of the picture when viewed at close range. To realize the fineness of the picture display, the dot pitch must be reduced as much as possible to make the picture even at a very close distance. When watching, there is still no obvious "graininess"; but the contradiction is that with the reduction of dot pitch and dense LED lamp bead array, the difficulty of the production process will also increase geometrically, and the stability and consistency of the product The problem will become more difficult to control, and the problem of LED dead pixels and unit inconsistencies in the later use process will become more serious. The prone to dead pixels will not only increase the difficulty of later maintenance, but also will be more obvious during close interactive demonstrations and viewing, which will greatly reduce the overall user experience.
In addition, the MINI/MICRO LED interactive display is a self-luminous display, and its screen is the largest heat source of the entire system. As the screen resolution increases, the more LED beads per unit area, the greater the heat generated by the screen; and In contrast, MINI/MICRO LEDs have fewer cooling and cooling methods. Except for the small fan on the back of the screen to cool down, they mainly rely on the surface of the screen to radiate heat to the air to cool down. The temperature of the air rises abnormally. According to feedback from many users, this temperature usually exceeds forty degrees. Under such high temperature conditions, it is extremely uncomfortable and convenient for the presenter or audience to watch or touch the demonstration close to the screen. of. Therefore, it is obvious from the above that, although the MINI/MICRO LED display is a relatively technologically advanced new LED display product compared to the traditional LED display, it must become a large-screen product suitable for indoor interactive display scenarios. There are still problems and directions for improvement, such as (1) the fineness of the picture under close interactive viewing, (2) the health problem of eye protection under close interactive viewing, (3) the screen under close interactive viewing Heat problems, (4) screen broken pixels caused by frequent and long-term use, etc. These problems still need to be solved step by step by giving the industry more resources under the catalysis of time.
From the comparison of the smart laser screen, the smart laser screen emits softly and does not dazzle the eyes, the cold screen does not heat up, the screen is fine and non-grainy, and the daily viewing eye protection is healthier. These characteristics are all the smart laser screens under the trend of interactive large-screen display. Compared with the MINI/MICRO LED display, the more prominent feature is also the main advantage that the smart laser screen can be used as an interactive large screen.
