Comparison and analysis of the three major splicing technologies for large screens

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Over the past decade, the domestic large-screen splicing market has gone through tests and accumulation and still maintained a good trend of rapid development. As we all know, the three major splicing technologies, such as PDP, DLP, and LCD splicing, have occupied the mainstream market in the large-screen market. Large-screen LCD splicing technology is an emerging technology that emerged after PDP and DLP splicing technology. With a series of high-definition display advantages that PDP and DLP splicing screens do not have, such as high definition, high brightness, high color saturation, high contrast, and high resolution, it is highly praised and respected by the large-screen market and is widely used in many fields and industries such as security, advertising media, entertainment culture, command centers, and coal mines.

DLP stands for "Digital Light Procession", which means digital light processing in Chinese. This technology uses a digital micromirror chip (DMD) as the main key processing element to realize the digital optical processing process. The principle is to separate the light emitted by the bulb into three primary colors of RGB through a color wheel, and then project the colors onto the DMD chip through a lens; using the synchronous signal method, the electrical signal of the digital micromirror chip converts the continuous light into grayscale, and then displays the colors by combining the three colors of R, G, and B, and finally reflects through the projection lens to form an image on the projection screen.

From the technical principle of DLP, it has the following advantages:

Fully digital: DLP technology provides a projection method that can display digital signals, thus completing the fully digital underlying structure.

Precise Gray Scale: Its digital nature enables fine image quality with precise digital gray scale and color reproduction.

Reflective Advantage: Because DMD is a reflective device, it has over 60% light efficiency, making DLP system displays more efficient.

Seamless image advantage: Due to the use of rear projection, the image can be 100% projected onto the entire screen. Through specially treated screen edges, the gap between screens is made less than 0.5mm, commonly known as seamless splicing.

Reliability: The effective service life of DMD can reach 100,000 hours.

Of course, DLP splicing also has its disadvantages. Since the light source of DLP splicing comes from the bulb, it consumes a lot of power and has a high heat dissipation. Moreover, the brightness will decrease after a period of use, so users must constantly replace the bulb to maintain the original display effect. In addition, its unit box is large, which will cause some troubles during installation, etc., which brings inconvenience to users.

However, with the continuous development of splicing technology, the current DLP splicing uses DLP splicing units after LED light source, which not only has a major breakthrough in service life, but also has revolutionary changes in color, power consumption, etc., allowing DLP splicing to continue to maintain its market leading advantage.

The full name of LCD is Liquid Crystal Display. The structure of LCD is to place liquid crystals between two parallel pieces of glass. There are many vertical and horizontal thin wires between the two pieces of glass. The direction of the rod-shaped crystal molecules is controlled by whether they are powered on or not, and the light is refracted to produce the picture. Because the liquid crystal material itself does not emit light, there are lamps on both sides of the display screen as light sources, and there is a backlight panel (or light homogenizing panel) and a reflective film on the back of the LCD screen. The backlight panel is composed of fluorescent materials that can emit light. Its main function is to provide a uniform background light source. The light emitted by the backlight panel enters the liquid crystal layer containing thousands of liquid crystal droplets after passing through the first polarization filter layer.

The droplets in the liquid crystal layer are contained in a tiny cell structure. One or more cells constitute a pixel on the screen. Between the glass plate and the liquid crystal material is a transparent electrode, which is divided into rows and columns. At the intersection of the rows and columns, the optical rotation state of the liquid crystal is changed by changing the voltage. The liquid crystal material acts like a small light valve. Around the liquid crystal material are the control circuit part and the drive circuit part. When the electrodes in the LCD generate an electric field, the liquid crystal molecules will be distorted, thereby refracting the light passing through them in a regular manner, and then being filtered by the second filter layer and displayed on the screen.

LCD is a splicing technology that has only been developed in recent years. Its biggest advantages are low power consumption, light weight, long life, no radiation, uniform screen brightness, etc., but the biggest disadvantage of LCD is the large seam. It cannot compete with DLP, which has a seam of only a few tenths of a millimeter. This is also the key factor that LCD splicing only occupies the mid- and low-end market at present. In order to reduce the seam and reduce the sense of separation brought by the seam to users, LCD splicing manufacturers have been working hard. In recent years, the seam of LCD splicing units has been continuously improved from the initial 7.3mm to 6.7mm, and then to the 5.5mm LCD splicing screen unit launched in 2011. Breakthroughs have been made in the seam, setting off a wave of LCD splicing again and again.

PDP is the abbreviation of Plasma Display Panel, and its Chinese name is plasma display panel. PDP is a display technology that uses gas discharge. It uses plasma tubes as light-emitting elements. Each plasma tube on the screen corresponds to a pixel. The screen uses glass as a substrate. The substrates are spaced a certain distance apart and sealed airtightly around to form discharge spaces. The discharge space is filled with mixed inert gases such as neon and xenon as working media. Metal oxide conductive films are coated on the inner sides of the two glass substrates as excitation electrodes. When voltage is applied to the electrodes, the mixed gas in the discharge space undergoes plasma discharge. Gas plasma discharge generates ultraviolet rays, which excite the fluorescent screen, which emits visible light and displays images. When a fluorescent screen coated with three primary color phosphors is used, ultraviolet rays excite the fluorescent screen, and the light emitted by the fluorescent screen is red, green, and blue. When each primary color unit achieves 256 levels of grayscale and then mixes colors, color display is achieved.

Compared with LCD technology, PDP splicing not only achieves that the larger the screen, the higher the depth of field and fidelity of the image, but also avoids the response time problem encountered in LCD technology. In addition, the seam of PDP has reached 3mm, which is much smaller than LCD splicing. Although it cannot reach the seam of DLP splicing of a few tenths of a millimeter, it has little impact on the visual effect, and the screen of PDP is very thin. In short, PDP splicing technology combines all the advantages of LCD and DLP technologies and overcomes their shortcomings at the same time. Especially in recent years, plasma technology has overcome its fatal shortcomings. After the "burn-in" phenomenon, more and more manufacturers have begun to enter the plasma market.

According to relevant data, among the three major mainstream large-screen display technologies, DLP splicing screens account for 48% of the overall market, LCD splicing accounts for 44%, almost catching up with DLP's market share, PDP splicing share has declined, accounting for only 6%, and small-pitch LED dot matrix splicing screens account for 2%; with Samsung, LG and other manufacturers successively launching splicing screens with small seams, coupled with the launch of terminal high-definition and ultra-high-definition processing equipment, such as the 3.5mm splicing LCD splicing screen and 16x ultra-high-definition solution (resolution can reach 7680*4320) launched by Oudi, the development potential of the LCD splicing screen market is optimistic by the industry.

Compared with other display screens in the large-screen market, LCD splicing has a rich variety of LCD splicing screen products with a full range of sizes, including 40", 42", 46", 47", 55", 60" and other sizes of DID LCD splicing narrow-border series, ultra-narrow-border series, etc., which can fully meet the needs of customers and can be arbitrarily combined and infinitely spliced ​​according to project requirements to meet the needs of different venues. With the development of splicing technology, its seam bottleneck has gradually made substantial breakthroughs. For example, the ultimate 3.5mm seam LCD splicing screen launched by OUDI this year fully guarantees the integrity of the display screen. It has the large-screen display advantages of large-size DLP rear projection and PDP plasma splicing units, and also makes up for a series of inevitable problems such as transportation and installation.

Among them, the life of the liquid crystal backlight source used in the LCD splicing screen is ten times that of the rear projection bulb. The most significant advantage over the projection is that the BSR liquid crystal splicing technology is more mature and saves electricity significantly. Compared with DLP and PDP, in addition to the high definition, high brightness, high color saturation, high contrast, and high resolution of LCD splicing, the service life of the liquid crystal is also very long, and the power consumption is low, the heat generation is small, the failure rate is very low, the performance is stable and supports 7×24 hours of uninterrupted work, and the subsequent maintenance cost is low.

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Reference address:Comparison and analysis of the three major splicing technologies for large screens

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