In which areas does the indoor small-pitch LED display stand out? Today we will explore this problem together. From the early three-in-one display to the later three-in-one, from the original large-pitch to the current small-pitch products, every product improvement is related to the cutting of LED chips. The advancement of packaging is inseparable. In other words, it is the upstream chip and packaging manufacturers that drive the development of LED displays to high density, high definition, and high reliability.
However, after the LED stepped from the 3mm pitch to the 2mm--3mm interval, this kind of active and passive began to reverse. Powerful LED display manufacturers have opened up new application modes and application fields for high-density, small-pitch displays. Among them, the 2.5mm pitch display screen is the most typical representative.
LED display screens have begun to be used in large-scale indoor professional display scenes, and DLP rear projection technology, which dominates the professional display field, has begun to carve up the display market with LCD splicing technology.
The speed of its sweeping the professional market is amazing. From the sporadic projects in 12 years to the current blooming, the product concept has been rapidly popularized, and the recognition and confidence of customers have also been greatly improved. This is actually the technology maturity of small-pitch LEDs. The most direct manifestation of the improvement and excellent display application effect progress.
Indoor small-pitch LED display
The concept of small-pitch display was born from 2.5mm. Small-pitch products are mainly concentrated in the range of 1.9-2.0mm, 1.5-1.6mm, 1.2mm and other pixel pitches. The reduction of raw material costs and the reduction of invalid pixels have given the market enough confidence and budget for the application of higher-resolution displays. In just three years from 13 to 15 years, the application of LED small-pitch displays has basically penetrated to 1.2 mm pitch and 1.5mm pitch interval. There is still room for technology to develop more dense pixel pitch. There are currently 0.9mm mature products and even 0.8mm application cases. These are enough to show the continuous exploration of more sophisticated products by R&D and manufacturing manufacturers.
In addition to the continuous improvement of pixel density and continuous improvement of product stability, the integrity of LED product design is also improving. In the early stage of small-pitch applications, product design still followed the traditional LED product design ideas, such as non-standard size design, cumbersome assembly and production, resulting in inconvenience in later maintenance work. Then with the market’s increasing application requirements for small-pitch products, and manufacturers’ pursuit of improving customer product experience, small-pitch products began to start from the perspectives of structural design, display size, signal source matching, etc., to deeply explore product enhancement possibilities , And gradually formed the product system and design style of their respective manufacturers.
Application field analysis of small pitch display
As a new generation of indoor professional display panels, small-pitch LEDs have the most direct impact on traditional DLP. From another perspective, it means that small-pitch LEDs actually form a technical substitute for DLP in product applications. But this replacement is not a simple one-to-one. There are still big application differences between the small-pitch LED display and DLP, so in different projects, the technical selection of the screen is particularly important.
The following is a brief analysis of the professional application scenarios of LED display, which is convenient for eliminating customers' misunderstandings in the application of certain products.
Broadcasting and TV studio scene application:
Broadcasting and TV studio video background applications, the anchor background video wall is the most typical, the studio has strict requirements on the color temperature, brightness, grayscale, viewing angle, contrast, refresh rate and other technical indicators of the display panel. Before the emergence of high-definition LED displays, more implementation schemes were rear projection splicing or LCD splicing. Traditional LED displays are difficult to meet the needs of such places in terms of technical parameters and performance, and the emergence of small-pitch products directly subverts the studio's understanding of LEDs. The small-pitch screen can easily meet this kind of scene application in various technical indicators, and the LED display has no joints and small unit size, which can easily meet the inner arc stage design. It is even more excellent in contrast and color. Compared with other panels, radio and television applications will be an important territory for high-definition LEDs.
Regarding the heatedly discussed moiré problem, in the early stage of LED application in the radio and television field, manufacturers and industries tried to circumvent this optical problem through certain technical means, but whether it is a soft film structure or a hard screen structure, it will improve the moir The texture effect also reduces the sharpness of the picture quality. Regarding the handling of the moiré problem, everyone has gradually agreed to reduce the moiré effect to a minimum by adjusting the camera position and joint adjustment of the camera focal length.
Combat command and large-scale video conference:
In large-scale conference venues, multi-person conference command and judgment scenes, shared video display are indispensable hardware facilities. Such scenes have a higher illuminance lighting design, or a more transparent lighting design to meet the reading and writing needs of the people present.
In this kind of high illuminance scene, while higher requirements are put forward on the brightness of the display screen, the display screen panel cannot produce glare, reflections and other interference due to the indoor lighting source. At present, most of the small-pitch LED display panels use matte black lights, and the surface of the display screen is composed of rough pixels, so while satisfying high brightness, it effectively overcomes the influence of indoor lighting sources.
At the same time, the advantages of seamless splicing of LEDs with small pitches have been maximized in this application field. Compared with rear projection and LCD (currently LCD narrow side stitching within 2mm), the user experience of LED display is one level higher.
In the initial stage of small-pitch applications, in the design of solutions for the security field, especially small and medium-sized projects, everyone feels helpless for the lack of LED display resolution, because there are a large number of security signals, and at the same time the number of on-screen signals is also large. Under the condition of limited display area, the resolution is insufficient, especially under the background of digital high-definition signal sources, this kind of hardware asymmetry is especially obvious.
Through the accumulation of experience in many projects, and the familiarity with the security business model, the hybrid model of LED + LCD has gradually been accepted by customers. In this mode, under the condition of satisfying customers' multi-signal on-screen display, LED is introduced as the main screen display, which avoids the technical defects such as the seam of the LCD screen, and can respond well to the security customer calling the research and judgment signal to zoom in and close-up. Demand.
Through the flexible configuration scheme, the integration of different dot pitches with LCD and other display technologies, the LED display has also cut into the application of the security field, and with the increase in dot density, there has been an opportunity to directly abandon the use of liquid crystal in some projects. Adopt the whole screen LED display mode. Of course, with the advancement of LED technology, we will see more new display areas being opened up.
The characteristics and development trend of the small-pitch display background system
After nearly five years of development, the small-pitch LED display has greatly improved the clarity of the display panel. As the density increases, the difficulty in further reducing the pixel pitch gradually increases.
At the same time, the back-end support system of the LED display is undergoing profound changes. The signal driving system of the display screen is also known as the sending card and the receiving card. The sending card has evolved from an embedded PCI slot at the beginning to an external type equipped with an independent power supply module.
After the application of small spacing, a standard 1U rack type is adopted. These are just changes in appearance and access methods. In terms of the system's carrying capacity, the sending card is gradually adapting to the video resolution under the standard video format. The most typical example is a single access that supports 1080P signals; The introduction of HDMI interface input, etc., are all in the front-end matrix of the platform with small pitch signals, and the control is matched to the interface and resolution.
In terms of receiving cards, the capacity of a single card to load increases as the pixel density of the display unit increases, and the space inside the unit is narrow, which gradually derives a memory stick-type receiving card with strong load and small size.
And in terms of double backup of signals, small-pitch LED displays use more traditional signal loop forms. When the system is stable and reliable, this form can achieve a certain degree of double backup effect, but in the near future , More manufacturers will use the form of dual system cards to replace the signal loop, so that the stability of the system will be more improved.
It is foreseeable that the system's receiving card suppliers are seeking business breakthroughs, and there are also explorations and discussions in the form of integrated circuit chips. I believe it will not be too long, and there will be disruptive forms in the display drive system.
At the signal access platform level of the video splicing wall, equipment suppliers at all levels are gradually shifting from repelling to adopting small-pitch LEDs.
Judging from the current standard hardware splicing controller for splicing walls, the product is output by the original interface with a fixed resolution. In order to adapt to the signal access characteristics of small-pitch LED products, the interface resolution can be freely defined.
From the original small-pitch LED manufacturers looking for splicers that can customize the output resolution, all splicers in the industry have supported or are trying to support LED splicing. This cannot be said to be a compromise and progress of the market by technology. .
It is not difficult for us to find that LED small-pitch products are gradually infiltrating the professional display field from traditional commercial display carriers. From the product itself to the back-end system, it is constantly adjusted and improved.
