The working principle, characteristics, advantages and disadvantages of PDP TV
PDP body technology has appeared in AC mode surface discharge color PDP TV since 1979. It has a history of 27 years in 2006. Its technology and performance have been gradually improved and improved. In 1993, it was developed into a 21-inch full-color PDP TV. (Pixel 640 × 480), a 42-inch widescreen with 852 × 480 pixels, which can display 16.77 million colors in 1996.
With the research and broadcast of digital TV in the United States, Western Europe, Japan, South Korea and China, in order to meet the needs of digital high-definition TV, a 42-inch 16: 9 PDP TV set was launched in 1998 with 1024 × 1024 pixels. 1280 × 720 and 50-inch 55-inch PDP TVs with a physical resolution of 1366 × 768 and 16: 9.
In order to cope with the challenge of LCD on the large screen size, the competition to increase the screen size of PDP TVs has never stopped. In October 2003, LG introduced a 76-inch PDP screen. In less than three months, Samsung exhibited an 80-inch PDP TV. By December 2004, Samsung exhibited a 102-inch PDP panel. 2005 In February of this year, Samsung launched another 102-inch PDP TV with a physical resolution of 1920 × 1080. Now Panasonic has launched a 103-inch PDP TV, which is now on the market.
How PDP TV works
In terms of working principle research, PDP TVs rely on high voltage to activate the special gas of the display unit to generate ultraviolet rays to excite phosphorescent materials to emit light; while LCD TVs use current to change the crystal structure of the thin-film transistors of the LCD panel. Image it.
In terms of imaging technology, PDP TV uses advanced "point-to-point" digital display technology, and the loss rate of picture reproduction is low.
From a technical point of view, since the light-emitting PDP tubes are evenly distributed in the plane, the center and edges of the displayed image are completely consistent, and the distortion phenomenon is not obvious. And because the display process does not need to rely on electromagnetic fields, the external electromagnetic field will not interfere with it, so it has better environmental adaptability.
PDP is a self-luminous display technology, does not require a background light source, so there is no problem of viewing angle and brightness uniformity. The design of the three-color phosphors sharing the same PDP tube also avoids the problems of focusing and convergence, and can achieve very clear images.
Main features of PDP TV
(1) Like the CRT TV, the PDP TV adopts the self-luminous principle of R, G, and B phosphors, so it has the characteristics of the CRT TV. High contrast, good color reproduction characteristics, display realistic images and excellent picture quality.
(2) The PDP TV is an inherent resolution TV that displays images in pixels, and displays images in an addressing mode. This is the same as the LCD, which is a flat-panel TV, so it has the light and thin aspects of the flat-panel TV. specialty.
(3) Among the current display devices, only PDP and DLP can realize full digitization, and display devices that do not require D / A conversion in signal transmission and display. So it has the advantages of digital TV display, also known as PDP is a digital CRT. Therefore, PDP has a large development space and application prospects in digital TV.
Advantages of PDP TV
(1) PDP TVs are easier to realize large screens and super large screens
If 36-80 inches is called a large screen, and over 80 inches is a super-large screen, PDP is easy to implement and adapt to the requirements of digital TV large screens and HDTVs; although LCDs are currently 65 inches or larger, the yield is low In terms of large screens, the price is more expensive than PDP.
(2) Large viewing angle
It has the widest viewing angle in a flat-screen TV, which can reach more than 160 °, that is to say, the audience sees the brightness, contrast and chromaticity of the image at different positions basically unchanged, close to the Viewing angle, but smaller than CRT, much larger than LCD TV.
(3) The response time is small, the moving image trailing time is short, and the dynamic clarity is high. It is superior to LCD TVs and comparable to CRT TVs.
(4) PDP does not use a backlight source like LCD, but uses R, G, and B three-color phosphor self-illumination like CRT, which has more features
Although the brightness is not as high as LCD, it changes with the change of average image level (APL). The display image is bright when APL is high, and the display image is dark when APL is low. The image is bright, bright, soft, and natural; the color gamut coverage is large, the color reproduction characteristics are good, the display image is bright and saturated, and matches the image displayed by the CRT; the brightness of the full screen is uniform; Limited, long life.
(5) Achieve full digitalization
In CRT, LCD, PDP direct-view TVs, only PDP TVs can be fully digitalized, that is, the end-to-end transmission process is all digital signal processing, and no signal will be generated without D / A conversion. Distortion and loss of image information degrade image quality; the brightness or grayscale of the image displayed by CRT and LCD are controlled by analog voltage, so the digital signal transmitted must be D / A converted, which will cause the signal Distortion and loss of information lead to degradation of image quality. Therefore, it can be said that PDP TVs have broad application prospects as digital TV display terminals.
(6) PDP TV has the advantages of flat-screen TV
Flat, thin and light, suitable for wall-mounted mode; adopts progressive addressing and high field frequency display, the image has no interline and large area flicker; the grating has no geometric distortion, the sharpness of the center of the screen is the same as the edge, and the full screen color is pure Good; grating position and tilt are not affected by geomagnetism; explosion-proof, radiation-proof, and safety.
(7) Dynamic power consumption
In high-brightness images or full white field signals, the power consumed by the PDP is relatively large; however, when displaying images of ordinary brightness, if the average image level is 40-50%, it is not much different from the power consumption of the LCD. The average image power If it is below 30%, the power consumption of PDP is still lower than that of LCD. Because the power consumption of the PDP changes with the change of the average image level (APL) of the displayed image, when the APL is low, that is, when the screen is dark, the power consumption is small; and the LCD no matter how bright or dark the screen, because the backlight lamp is always on, the power consumption is basically The same is true. For example: when watching the movie "The Lord of the Rings" with the same 37-inch PDP and LCD TV, the power consumption of the PDP is 159W, and the power consumption of the LCD is 280W.
The difference between PDP TV and LCD TV
(1) PDP is a product for TV, LCD is a product for information display
TV products must meet the basic requirements suitable for people to watch sports pictures: sports focus is accurate, and there is no smearing (the smearing surface is unclear. In fact, the most important thing is that the smearing of the TV makes the eye fatigue, and it is the most important thing to form myopia The reason is that the human eye always adjusts when looking at objects to see clearly. Long-term fatigue focusing will deform the eyeball ciliary muscles. Just like an autofocus camera, if the focusing system is not in place, the image will be blurred, resulting in the formation of (Myopia), image gray levels, true color reproduction, clear color hierarchy and other mandatory standards.
In the nearly one hundred years of history from the discovery of the LCD phenomenon to the invention of the LCD display, the LCD is widely used in static display fields such as electronic watches, electronic instrument displays, palmtop computers, notebook computers, and desktop computers.
(2) PDP is more suitable for watching digital TV and movies, and LCD is more suitable for downloading movies and discs with a slower rhythm and a higher signal format
In the future, China will fully open digital signals. PDP can directly convert digital signals without any conversion (A / D, D / A), so that users can see the original digital TV. Especially for various sports programs, action movies, etc., PDP has unparalleled advantages.
LCD production is the highest in South Korea. South Korea has always been inferior to Japan in the field of traditional CRT TVs. Therefore, South Korea takes computer LCD monitors as the main development object. As the LCD size increases, it begins to enter the TV field. We see that it is very comfortable to watch Korean romantic dramas on LCD generally, because these programs have a soothing rhythm and bright and vivid colors.
How to buy PDP TV
(1) The screen size should be satisfactory
Thin screen and large screen are the inherent advantages of PDP. PDP is a display technology that uses gas discharge, and its working principle is very similar to fluorescent lamps. The reason why PDP TV has become the first choice for many consumers is that its most prominent feature is that it can be ultra-thin while realizing a large screen. Products over 42 inches can usually control the thickness to within 10 cm. The thin and light shape makes its advantages more obvious, especially suitable for wall-mounted large-screen TVs. The popular size of large-screen PDP TVs is mainly 42 inches.
At present, as the main manufacturer of PDP TVs, Changhong and others have put large-screen PDP TVs of more than 50 inches on the market on a large scale, expanding the mainstream size of the market. The large screen and large field of view, as well as the design incorporating the fashion home style, have become the first choice of the fashionista. In the main technology, Changhong also uses the advanced Samsung SDIW1PDP screen, which not only has excellent screen effects, but also as a domestic brand, the affordable price is obvious to all. Once launched, it is highly sought after by consumers because of its high cost performance.
(2) The color quality should be full
The main technical indicators of PDP TV are: resolution, brightness, contrast and viewing angle, these factors jointly determine the quality of the picture.
When buying a PDP TV, be sure to pay attention to the resolution. PDPs currently on the market are divided into standard resolution (SD) and high resolution (HD) according to different resolutions. Although the standard resolution can meet the requirements of current TV signals, for high-definition digital TV signals that are developing rapidly, it is more applicable to have high-resolution PDP screens.
Color is also a technical indicator that should be paid attention to when purchasing. Simultaneously achieving high contrast and high brightness means that the colors of the picture are fuller and the picture quality is brighter and clearer. At present, the engine technology of several large manufacturers in Japan and South Korea can achieve high picture quality. Among domestic brands, the Changhong brand that uses Samsung SDIW1PDP screen can also achieve high-definition picture quality.
Here, it is particularly worth mentioning that the Changhong PDP screen also has four major advantages: the contrast is greatly enhanced, the low-reflective technology and the complementary color technology are good to improve the contrast; reduce the halo effect, the image outline is clearer; adopt the patented software algorithm, accurate Reproduce moving images; 550 billion color display capabilities, more realistic colors, more delicate pictures.
(3) Response time is the main reference indicator
Response time is also the main reference index for consumers to buy flat-screen TVs. In this regard, PDP TV has a significant advantage. At present, the mainstream response time of LCD TV is 4 milliseconds, while PDP TV uses self-luminous technology, the response time is much smaller. The PDP TV set launched by Changhong has made a major breakthrough in sports image quality. The advanced noise reduction technology enables accurate positioning of interference areas and reduces motion image overlap (false contour) when the image quality is reproduced. The CTR is equivalent, without tailing.
(4) Excellent sound quality should be shocked
Excellent picture quality must be accompanied by pure sound quality, so that the picture can have a sense of ambilight. When purchasing, be sure to pay attention to whether the PDP TV has a sound system. Changhong's seven-band equalizer, Samsung's two-channel speakers, Panasonic's ultra-thin subwoofer audio, etc., can provide extraordinary sound quality, creating a perfect home theater effect.
(5) Personality design should be fashionable
The personalized needs of PDP TVs are particularly favored. For example, Changhong ’s PDP screen circuit is particularly miniaturized. This not only makes the TVs have smooth lines and simple structures, but the most important thing is to enable products to achieve energy saving. Low energy consumption. The biggest benefit of Changhong PDP color TV is that it can save more energy consumption and expenses than similar products.
(6) Multi-function interface is necessary
When purchasing a PDP, you have to consider the support of high-definition TV in the future. Therefore, a PDP TV with a high-definition multimedia interface (HDMI) is a suitable choice. The HDMI port of the Changhong PDP color TV allows you to easily enjoy the pure audio signals of various digital devices. The digital high-definition picture quality and perfect sound quality of various HD devices are presented in front of you.
(7) The cost performance should be satisfactory
PDP TV has many advantages, and as prices have fallen sharply, many consumers have or are planning to move it home. At present, the lowest price of 42-inch PDP TV has dropped below 10,000 yuan. We know that the price of foreign brand PDP TVs is obviously higher than domestic brands, which is also the main concern of many consumers to buy foreign brands. In fact, the major domestic brands currently use advanced Japanese and Korean technologies in PDP's main technologies, such as Changhong's SDIW1PDP screen. The same quality and affordable price make the overall price-performance ratio of domestic PDP TVs more outstanding. When purchasing PDP TVs, we must grasp the scale of consumption: pay attention to technology, and choose the price smartly. As long as you master this standard, it is not difficult for ordinary families to move a home theater home.
(8) Pay attention to service life
Any product has a service life, and this is no exception for PDP TVs. It is the single most easily overlooked by consumers. The SDIW1PDP screen of Changhong's small circuit version greatly reduces the power consumption of the product, and naturally extends the service life of the PDP TV to 60,000 hours. If you watch 8 hours a day, you can use it for 20 years.
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