Plasma flat screen (PDP) technology in detail PDP (Plasma Display Panel) plasma flat screen technology overcomes the above weaknesses and becomes the best candidate for a true flat TV in the future. In fact, plasma display technology is not a new technology in recent years. As early as 1964, the University of Illinois successfully developed a plasma display panel, but then the plasma display was monochrome. PDP is a display device that uses gas discharge. This screen uses plasma tubes as light-emitting elements. A large number of plasma tubes are arranged together to form a screen. Each cell corresponding to each plasma is filled with neon-xenon gas. After the high voltage is applied between the plasma tube electrodes, the gas enclosed in the plasma tube chamber between the two layers of glass will generate ultraviolet light to excite the red, green and blue phosphors on the flat panel display to emit visible light. Each plasma tube is a pixel, and the combination of light and dark and color changes of these pixels produces various grayscale and color images. It is very similar to the glow of a kinescope. From the working principle, plasma technology exists compared with other display methods. The obvious difference leads the way in structure and composition. The working mechanism is similar to ordinary fluorescent lamps. The color image of the TV is synthesized by the luminescence of each independent phosphor pixel, so the image is bright, bright, clean and clear. In addition, the most prominent feature of the plasma TV is that it can be ultra-thin, and it can easily achieve a large flat screen of more than 40 inches, and the thickness is less than 100 mm. Plasma flat screen (PDP) best viewing distance At present, many consumers think that the 50-inch PDP is too large at home, and the 43-inch is just right. Some people think that the viewing distance is a personal preference. Others think that if you watch the plasma TV too close, you will see thicker particles. And too far distance will feel that the image is too small, and the shock is not enough; the Pioneer PDP fully reaches the resolution of XGA, and there is no problem in the near future. There is currently only one standard for viewing distance abroad. The viewing distance of 16: 9 should be approximately equal to 2 times the screen height, 4: 3 is 2.5 times the screen height, because the same size, the effective area of ​​16: 9 will be 4: 3 is smaller, so the viewing distance of 16: 9 is closer than that of 4: 3, so the best distance for 50 inches is about 2.5 meters, and the best distance for 43 inches is about 1.8 meters.
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Advantages and disadvantages of PDP plasma
Plasma display technology proves to have higher technical advantages than traditional kinescopes and LCD liquid crystal displays, manifested in:
1. Compared with direct-view CRT TVs, PDP monitors are smaller and lighter, and have no X-ray radiation. In addition, since the structure of each light-emitting unit of the PDP is completely the same, the geometric distortion of the image common to kinescopes will not occur. The brightness of the PDP screen is very uniform-there are no bright and dark areas, unlike the brightness of the picture tube-the brightness of the center of the screen is higher than that of the surroundings, and the PDP is not affected by the magnetic field and has better environmental adaptability. The PDP screen also does not have the problem of focusing, so it completely eliminates the intractable problems of certain areas of the kinescope or the defocusing that has been defocusing for a long time; the color drift of the kinescope will not occur, and the flat surface also makes the large screen The distortion and color purity at the corners have been completely improved. At the same time, its high brightness, large viewing angle, full color and high contrast mean that the PDP image is clearer, the colors are more vivid, the experience is more comfortable, and the effect is more ideal, which makes the traditional TV amazing.
Second, compared with LCD liquid crystal display, PDP display has the advantages of high brightness, good color reproduction, rich grayscale, and fast response to rapidly changing pictures. Because the screen brightness is as high as 150 Lux, you can enjoy large-screen video programs in a bright environment. In addition, PDP has a wide field of view, which can provide exceptionally bright, even and smooth pictures and an unprecedented viewing angle. The viewing angle of the PDP is as high as 160 degrees. The ordinary TV set has been severely distorted when viewed in a place greater than 160 degrees. As for the LCD screen with a viewing angle of only about 40 degrees, it is even more unprecedented. In addition, the flat and thin appearance of PDP makes its advantages more obvious, especially suitable for public information display, wall-mounted large-screen TV and automatic monitoring system.
3. Because PDP monitors can easily "operate" and match "combat" with large-scale integrated circuits, it can be put into battle with ease. The parts in the body can be disassembled, the process is convenient, the structure is simpler, and it is suitable for modern mass production. At the same time, it can greatly reduce the size and weight of the machine, the effect is very ideal.
Of course, due to the special structure of the PDP plasma display screen, it also brings some weaknesses. For example, because the plasma display is a flat design, and the glass on the display is extremely thin, its surface cannot withstand too much or too little atmospheric pressure, nor can it withstand unexpected heavy pressure. Each pixel of the PDP display screen independently emits light by itself. Compared with the use of an electron gun in a CRT TV, the power consumption is greatly increased. Generally, the power consumption of plasma displays is higher than 300 watts, which is a big consumer of household appliances in the future. Due to the high heat generation, multiple sets of fans are installed on the back panel of the PDP display for heat dissipation. In addition, PDP prices are relatively high, mainly used in public places, such as airports, railway stations, exhibition venues, corporate seminars, academic conferences and remote meetings.
Prospects of PDP plasma
Due to the bright prospects and huge market potential of PDP displays, major manufacturers around the world are eyeing this market. In 1995, NEC developed its own 42-inch PDP prototype. In the past 1998, PDP progressed smoothly with continuous achievements. It was a year of PDP success. International and domestic manufacturers actively developed and produced PDP, but the price was relatively high. At this stage, it is mainly used in commercial occasions.
PDP display products currently occupy a large market in office equipment, and the next step forward will be the color TV market. Due to the outstanding display effect of PDP, the function can be continuously expanded as needed like a multimedia computer. It can watch TV, watch VCD, DVD movies as normal color TV, and can watch digital TV, Internet, and receive satellite TV in the future. It will replace CRT TVs and projection TVs as the preferred display device for future home theaters. In addition, the PDP display has a rich and friendly interface. In addition to connecting audio-visual equipment such as DVDs, video recorders, and camcorders, it can also be connected to personal computers, electronic game consoles, and connected to cable TV, satellite TV, and TV sets through external set-top boxes and tuners. Digital high-definition televisions and other expanding multimedia signal sources have become the most outstanding high-definition multimedia display terminals. It is foreseeable that PDP will become an open high-definition display device. Digital high-definition televisions with greater thunder and smaller raindrops will enter the home in advance and become the first choice for current color TVs.