Label: Plasma Imaging Principle
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Not long ago, a research institute released a market research report on color TV sales in the first half of the year. The specific data may not be remembered by everyone, but the most impressive thing should be the words “fall†and “declineâ€. Indeed, the color TV in the first half of the year The market is not optimistic, and the plasma TVs that have been at a disadvantage for many years are even more bleak. By now, the market share of plasma has been less than 10%.
Plasma principle and analysis of advantages and disadvantages
Faced with this situation, some people predict that plasma TV will be eliminated in the next one or two years. For the same powder, if the plasma disappears so quickly, there will be many regrets. They believe that although OLED TV rumors will be launched this year, but the price of the listing will certainly be very high, so they think that before the OLED TV mature (about 3 years), plasma is still the best choice.
The last article "The United States invented the history of the development of plasma technology in Japan" has aroused widespread concern among netizens, and many netizens are looking at the article with a mentality that supports plasma. This can be seen in the comments.
Many netizens have expressed their love for plasma TVs.
In addition to those who strongly support plasma, in fact, many consumers are confused about what is a plasma TV, plasma TV has any advantages and disadvantages, and in order to understand the doubts in everyone's mind, so there is today's article.
Plasma TV imaging principle
The imaging principle of plasma TVs and LCD TVs is quite different. Liquid crystals illuminate the picture with a large backlight, while plasma emits light for every pixel. Since the focus is on plasma today, LCD TVs are not covered here.
The difference between the imaging principle of plasma TV and LCD TV
The working principle of plasma TV is very similar to that of fluorescent lamp. Plasma tube is used as the light-emitting element. Each plasma tube on the screen corresponds to one pixel. The screen uses glass as the substrate. The substrate is separated by a certain distance, and the surrounding is sealed by airtightness to form a discharge. space. The discharge space is filled with a mixed inert gas such as helium or neon as a working medium. A metal oxide conductive film is coated on the inner side surfaces of the two glass substrates as an excitation electrode.
Plasma panel principle
When a voltage is applied to the electrodes, a plasma discharge phenomenon occurs in the mixed gas in the discharge space. The gas plasma discharge generates ultraviolet light, the ultraviolet light excites the fluorescent screen, and the fluorescent screen emits visible light to reveal an image. When a phosphor screen coated with phosphors of three primary colors is used, the ultraviolet light excites the phosphor screen, and the light emitted by the phosphor screen is red, green, and blue. When each primary color unit realizes 256-level gray scale and then performs color mixing, color display is realized.
Plasma panel principle
Plasma display technology can be divided into two types: DC-type PDP with electrodes in direct contact with gas and AC-type PDP with electrodes covering the dielectric layer. There are three main types of color PDPs currently being researched and developed: single-substrate (also known as surface discharge) AC PDP, dual (also known as counter-discharge) AC PDP and pulse storage DC PDP.
After reading the above detailed introduction, you may find it too complicated. In fact, it can be easily understood that plasma TV uses a display technology that uses gas discharge and relies on high voltage to activate the special gas in the developing unit. It produces ultraviolet light to excite phosphorescent light.
Plasma TV advantages and disadvantages analysis
Although the sales of plasma TVs are far less than LCDs in recent years, there has always been a bunch of consumers who support it. So what makes them so fond of them? Simply put, it is the fascinating advantages of plasma.
With the above principles, you should be able to understand the advantages and disadvantages of plasma TV more easily:
â— Advantages
First, the color reproduction ability is good, and the display color is natural. Because the plasma TV is illuminated by ultraviolet light and the advanced driving technology, the plasma panel can display more color gradations and the gray scale performance is more perfect. Therefore, the color is ahead of the LCD TV, and the displayed image is more natural and true. .
Second, the dark field has a large dynamic range and a rich image layering. The brightness of the plasma TV screen changes with the average image level (APL). When the APL is high, the image is bright, and when the APL is low, the image is dark. Therefore, the contrast is high, the image is highly layered, the definition is high, and the image is displayed naturally. real.
Third, the image has a small tailing time and high dynamic definition. Compared with LCD TVs, plasma TVs have higher dynamic resolution, and they are more smooth for high-speed motion pictures such as sports games and action movies, and there is no tailing phenomenon.
Plasma effect is quite dynamic
Fourth, the viewing angle is large, and the brightness uniformity is good. Since the plasma uses active illuminating technology, its viewing angle is quite large. In addition, plasma does not appear as a vignetting angle like liquid crystal, and the entire display area can achieve extremely high uniformity and uniformity.
LCD is left and right, plasma is in the middle
LCD is left and right, plasma is in the middle
Fifth, it is easy to achieve large screen. The thick film technology used in plasma TVs is easy to make large sizes, which can provide a larger picture. Matsushita once released 103 inches in 2006, and in 2010, Panasonic expanded its size to 152 inches.
Panasonic 152-inch 3D plasma TV
â— disadvantages
First, the screen size is small, small size models are few. Plasma TVs offer a small selection of sizes, basically focusing on the specifications of 42, 46, 50, 55, 60 inches. At present, these small sizes of 32 and 26 inches have also disappeared (32-inch plasma has been a lot of The manufacturer has launched, but it has not been welcomed by the market).
Plasma TVs offer a small selection of sizes
Second, the volume is larger, the weight is larger, and the heat is larger. Plasma TVs are not as thin as LED-backlit LCD TVs, and their volume is relatively large. Because of the large number of components, the weight of plasma is also relatively large.
The same size plasma, liquid crystal body thickness comparison
Panasonic TH-P46GT31C Samsung UA46D7000LJ
Thickness 58mm Thickness 29.7mm
Third, due to high temperature discharge, it is easy to burn out. The so-called burn-in screen is that the plasma TV keeps a certain picture for too long, which will make a certain screen stay on the TV for a long time. If after a while, the picture disappears, then it is the image of the plasma.
Plasma "burning screen" means leaving a permanent pixel trace on the screen
Fourth, the screen brightness is low, the graininess is more obvious. Plasma TVs do not have the same brightness as LCD TVs with independent backlights due to problems such as luminous efficiency. Therefore, in brighter places, the viewing effect of plasma TVs will be much lower.
5. The power consumption is high and the noise is obvious. Compared with LCD TVs, plasma TVs consume a lot more power, so we can often see that many manufacturers use energy-saving and power-saving as a selling point to fight plasma.
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