Application of the hottest PDP TV in public inform

2022-08-24
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Application of PDP TV in public information display system

now many public places have information prompt systems, such as airport arrival and departure flight display, bank interest rate display, mall commodity information and so on. Originally, LED display was generally used, but with the continuous reduction of the price of large screen PDP TV, PDP TV is used in more and more occasions to display information

Figure 1 airport flight prompt information system

I. display principle of PDP

pdp display (English: plasma display, Chinese: plasma display) is a new generation of display after CRT and LCD, which is characterized by small thickness and can be used on the wall, representing the development trend of display in the future

Both PDP and LCD belong to flat panel displays, but their working principles are different. The working principle of PDP display is somewhat similar to CRT and fluorescent lamp. The ultraviolet light generated by the discharge of inert gases (NE, he, Xe, etc.) is used to stimulate the color phosphor to expand the field and enter the shipbuilding market, and then this light is converted into light visible to human eyes. The screen is arranged by several small discharge spaces. Each small discharge space is called a cell, and each cell is responsible for one of the three colors of red, green and blue (RGB). Therefore, the multi tone color we see is mixed by three cells with different proportions of primary colors, and this color mixing method is actually similar to the color mixing method used in the LCD screen. The architecture of each cell uses the working principle similar to that of fluorescent lamps. That is, you can think of it as a very compact UV fluorescent lamp, which uses dissociated inert mixtures of helium (he), neon (NE), xenon (Xe) and so on. When high-voltage electricity passes through, it will release electrical energy, trigger the gas in the cell, generate gas discharge, and emit ultraviolet light. When the cell is stimulated by high pressure to produce ultraviolet light, the ultraviolet light is used to excite the red, green and blue phosphors on the coated glass, and then produce the required three primary colors of red, green and blue. By controlling different cells to emit ultraviolet light of different intensity, three primary colors with different brightness can be generated, and then various colors can be formed

because the inert gas is excited by ultraviolet light, like CRT, it belongs to autoluminescence, which is different from the passive luminescence of LCD. Therefore, the brightness, color brightness and screen reaction speed of PDP screen are similar to those of CRT. The brightness of PDP screen can easily exceed 700 cd/m2, and the contrast can generally reach more than 2000:1. In addition, because the structure of each light-emitting unit of PDP is identical, there will be no common image geometric distortion of CRT. The brightness of the PDP screen is very uniform - there are no bright and dark areas, unlike the brightness of CRT - the brightness of the center of the screen is higher than that of the surrounding area. Moreover, the PDP will not be affected by the magnetic field and has better environmental adaptability. PDP universal tensile testing machine flat sample jaw 0 ⑵ 0mm1 secondary screen also does not have the problem of focusing, so it completely eliminates the persistent problem of poor focusing in some areas of the picture tube or defocusing for a long time; There will be no color drift of the picture tube, and the flat surface will completely improve the distortion and color purity changes at the corners of the large screen

II. Cooperation between PDP TV and background control

in previous applications, many background applications used some video playback devices, such as VCD, DVD, VHS video recorder, etc. In terms of the content to be played, it is generally necessary to make a fixed video playback format file in advance. If the display content needs to be replaced, VCD and DVD discs must be made again, which is very inconvenient and time-consuming to update

pdp TVs generally have VGA interfaces, which can be connected to computers and used as monitors. Some PDP TVs also have DVI interfaces. In the current public information display system, the industrial computer is generally used in the background, and the content played is controlled by the software in the background. Therefore, the selection of broadcast materials is very extensive and flexible. It can display all kinds of instant messages with the powerful function of computer

The aspect ratio of PDP TV is basically 16:9. Such a display size is convenient for displaying multiple groups of information on the same display screen, such as entertainment information on the left side of the display screen and real-time information on the right side. The physical resolution of 42 "PDP TV is generally 852*480, and that of 50" PDP TV is 1366*768. Of course, there are other resolutions such as 1024*768, 1024*1024, etc. PDP is similar to LCD, and there is only one optimal display resolution. When the physical pixels of PDP TV screen correspond to the logical points output by the graphics card one by one, this physical resolution is the optimal display resolution of PDP screen. Only under the best resolution, the displayed picture and characters will not be deformed, so as to achieve the best display effect

the aspect ratio of our computer's common display resolution is generally 4:3, such as 800*600, 1027*768, etc., and the VGA signal of the computer is analog R, G, B signal. Generally, the PDP screen inside the PDP TV adopts LVDS digital interface and pure digital signal. When the VGA signal of the computer is input into the TV, it must be converted through the a/d (analog/digital) conversion of the VGA signal conversion board of the TV. This signal conversion board has another function, that is, to zoom the 4:3 VGA signal through a certain algorithm, so that it can be displayed on the 16:9 TV full screen. However, this scaling is not equal scale, so the displayed images and characters will be deformed, which is similar to mosaic and edge blur

if you want to realize the perfect display of images and characters on the PDP, you must have two basic conditions: the surface of the friction wheel in the gearbox must not be oiled or splashed with oil: 1. The PDP TV must be able to accept the signal of physical resolution and display the input signal on the screen in a point-to-point manner; 2. The computer must be able to provide VGA signal of PDP TV physical resolution

everyone may think that PDP TV must be able to receive signals with physical resolution and display them perfectly. In fact, this is because PDP TV manufacturers consider that computers generally cannot produce resolutions such as 852*480 and 1366*768, so they only consider and optimize the scaling of 4:3 VGA signal in the scaling algorithm of VGA signal conversion board. For the standard 16:9 resolution signals of 852*480 and 1366*768, they are also used as 4:3 signals for indiscriminate scaling operation, which results in the display effect of 852*480 and 1366*768 is not as good as that of 800*600 and 1024*768. We can see that in the technical parameters of many PDP TVs, there are many provisions on the input resolution of VGA signals that do not have 852*480, 1366*768 and other resolutions. Therefore, it is also very important to choose a TV to display the picture perfectly on the PDP TV. You must select TVs that can support 852*480, 1366*768 resolution input

in order for the computer to provide input signals with resolutions of 852*480 and 1366*768, the BIOS and driver of the computer's graphics card must be modified accordingly, so that it can realize VGA signal output with resolutions of 852*480 and 1366*768

for those applications with low display requirements, you can choose some conventional products. As long as you can output VGA signals with resolutions of 800*600, 1024*768, etc., you can meet the requirements. However, for applications with high display requirements, the display chips used in PDP TVs and computers must be selected, and the above two basic conditions must be met in order to achieve high-quality display effects

Yanyang company has corresponding products that can output 852*480 and 1366*768 standard 16:9 resolutions. For example, gene-6350 and gene-8310 can provide 852*480 and 1366*768 resolutions by using special BIOS and display driver, and can achieve perfect display effect with the corresponding PDP TV

As a new display medium, with the continuous development of the service industry, the information prompt system composed of PDP TV and embedded computer system will be more widely used. It will be more widely used in public places such as airport flight information display, train tightening and other intensity test stations, subways, large commercial buildings, large shopping malls, hotels, convention and exhibition centers, financial institutions and so on. (end)

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