Three thrones in the large-screen splicing market: PDP, DLP, LCD splicing
For more than a decade, the domestic splicing large-screen market has withstood the test and accumulated a good momentum of rapid development. As is known, the three splicing technologies such as PDP, DLP, and LCD splicing have occupied the mainstream in the large-screen market. Large-screen LCD splicing technology is an emerging technology after PDP and DLP splicing technologies. With the series of high definition, high brightness, high color saturation, high contrast and high resolution that PDP and DLP splicing screens do not have The high-quality display advantage is highly praised and respected by the large-screen market, and is widely used in many fields such as security, advertising media, entertainment culture, command centers, coal mines and many other industries.
The full name of DLP is "Digital Light Procession", which means digital light processing in Chinese, which means that this technology uses digital micromirror wafer (DMD) as the main key processing element to realize the digital optical processing process. The principle is that the light emitted by the bulb is divided into three primary colors of RGB through a color wheel, and then the color is projected by the lens on the DMD chip; the signal of the digital micromirror chip is converted into continuous light by the method of synchronous signal For the gray scale, the colors are displayed with the three colors of R, G, and B, and finally the reflection is imaged on the projection screen through the projection lens.
From the technical principle of DLP, it has the following advantages:
Full digitalization: DLP technology provides an achievable projection method for displaying digital signals, thus completing the full digital underlying structure.
Accurate gray scale: its digital nature can obtain fine image quality and color reproduction with accurate digital gray scale.
Reflective advantages: Because DMD is a reflective device, it has an optical efficiency of more than 60%, making DLP systems display more efficient.
Seamless image advantage: Thanks to the rear projection method, 100% of the image can be projected on the screen, and the gap between the screens is less than 0.5mm through special processing of the edge of the screen, commonly known as seamless splicing.
Reliability: The effective service life of DMD can reach 100,000 hours.
Of course, DLP stitching also has its shortcomings. The light source of DLP splicing comes from the light bulb, which causes large power consumption and high heat dissipation, and the brightness will decrease after a period of use, so that users must constantly replace the light bulb to maintain the original display effect, and its unit box The size is large, it will cause some troubles during installation, etc., which will cause inconvenience to users.
However, with the continuous development of splicing technology, the current DLP splicing adopts the DLP splicing unit after the LED light source, which not only has a major breakthrough in service life, but also has revolutionary changes in color and power consumption. Let DLP splicing continue to maintain market leading advantages.
The English name of LCD is Liquid Crystal Display. The structure of LCD is to place liquid crystals in two parallel glasses. There are many vertical and horizontal thin wires in the middle of the two glasses. Through the energization or not to control the change of rod-shaped crystal molecules Direction to refract light to produce a picture. Because the liquid crystal material itself does not emit light, there are lamps on both sides of the display as a light source, and on the back of the liquid crystal display there is a backlight plate (or uniform light plate) and a reflective film. The backlight plate is composed of fluorescent substances Can emit light, its role is to provide a uniform background light source. After passing through the first polarizing filter layer, the light emitted by the backlight board enters the liquid crystal layer containing thousands of liquid crystal droplets.
The droplets in the liquid crystal layer are contained in a fine cell structure, one or more cells constitute a pixel on the screen. There is a transparent electrode between the glass plate and the liquid crystal material. The electrode is divided into rows and columns. At the intersection of rows and columns, the optical rotation state of the liquid crystal is changed by changing the voltage. The function of the liquid crystal material is similar to 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 are twisted, so that the light passing through them is refracted regularly, and then filtered by the second filter layer is displayed on the screen.
LCD is a splicing technology that has only been developed in recent years. Its biggest advantage is that it has low power consumption, light weight, long life, no radiation, and uniform screen brightness. However, the biggest disadvantage of LCD is the large stitching. . The stitching with DLP of only a few tenths of a millimeter cannot be overcome. This is also the key factor for LCD splicing to occupy the low-end market. In order to reduce the stitching and reduce the sense of spacing that the stitching brings to the user, LCD splicing manufacturers have been working hard in recent years. The LCD splicing unit has been stitched from the initial 7.3mm to 6.7mm, and then to The newly launched 5.5mm LCD splicing screen unit in 2011 has continuously made breakthroughs in stitching, setting off a wave of LCD splicing again and again.
PDP is the abbreviation of Plasma Display Panel, the Chinese name is plasma display panel. PDP is a display technology that uses gas discharge. It uses a plasma tube as a light-emitting element. Each plasma tube on the screen corresponds to a pixel. The screen uses glass as a substrate. The substrate is separated by a certain distance. The surroundings are sealed by airtight sealing to form a Discharge space. The discharge space is filled with mixed inert gas such as neon and xenon as working medium. The inner surfaces of the two glass substrates are coated with conductive metal oxide films as excitation electrodes. When a voltage is applied to the electrode, a plasma discharge phenomenon occurs in the mixed gas in the discharge space. The gas plasma discharge generates ultraviolet rays, and the ultraviolet rays excite the fluorescent screen, which emits visible light and displays an image. When a fluorescent screen coated with three primary colors of phosphor is used, ultraviolet light excites the fluorescent screen, and the light emitted by the fluorescent screen presents three primary colors of red, green, and blue. When each primary color unit achieves 256 levels of gray and then performs color mixing, color display is achieved.
Compared with LCD technology, PDP stitching has not only achieved, the larger the screen, the higher the depth of field and fidelity of the image, but it also avoids the problem of response time encountered in LCD technology, and the PDP stitching has been Up to 3mm, it is much smaller than LCD splicing. Although it cannot reach the stitching of a few millimeters of DLP splicing, it has little effect on the visual effect, and the PDP screen is very thin. In short, PDP splicing technology combines all the advantages of LCD and DLP and overcomes their shortcomings. Especially in recent years, plasma technology has overcome its own fatal shortcomings. After the "burning screen" phenomenon, more and more manufacturers have begun to enter the plasma market.
According to relevant information, in the current three major large-screen display technologies, the market share of DLP splicing screens accounts for 48% of the overall market, and the LCD liquid crystal splicing accounts for 44%, almost catching up with the market share of DLP, and the share of PDP splicing declines. , Only 6%, and small-pitch LED dot matrix splicing screens account for 2%; with Samsung, LG and other manufacturers successively launching small stitching splicing screens, plus the introduction of terminal high-definition and ultra-high-definition processing equipment, such as the launch of Oudi The 3.5mm stitching LCD splicing screen and 16 times ultra high definition solution (resolution up to 7680 * 4320), the market development potential of the LCD liquid crystal splicing screen is optimistic in the industry.
Compared with other display screens in the large-screen market, LCD splicing products are rich in various sizes, including 40 ", 42", 46 ", 47" 55 ", 60" and other sizes of DID LCD splicing narrow-side series, ultra-narrow Side series, etc., can meet the needs of customers in an all-round way, and can be arbitrarily combined according to the needs of the project, and unlimited splicing can meet the needs of different places. With the development of splicing technology, its splicing bottleneck has gradually made a substantial breakthrough. Nowadays, the ultimate 3.5mm spliced ​​LCD splicing screen launched by Oudi fully guarantees the integrity of the display screen. It has a large-size DLP rear projection and The large screen display advantage of PDP plasma splicing unit also makes up for a series of inevitable problems such as its transportation and installation.
Among them, the life span of the LCD backlight used in the LCD splicing screen is ten times that of the rear projection bulb. The most significant advantage of projection is that the BSR liquid crystal splicing technology is more mature and power saving is obvious. Compared with DLP and PDP, except for the liquid crystal splicing High-definition, high-brightness, high-color saturation, high-contrast, high-resolution, at the same time, the service life of the LCD is very long, and the power is low, the calorific value is small, the failure rate is very low, and the performance is stable. 7 & TImes; 24 Hours of uninterrupted work and low maintenance costs later.
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