Multi-functional teaching equipment is springing up like mushrooms, and it is more and more widely used in the field of teaching. It is also favored by teachers and students. However, in the face of numerous brands, consumers often find it difficult to choose, especially not knowing whether the interactive touch all-in-one used in teaching is a good LCD screen or a plasma screen.
Plasma occupies an absolute market advantage mainly in the large size field of 42 inches and above, but because of the large proportion of small and medium-sized liquid crystals, it leads to an underestimation of the domestic plasma market value. With the advent of China's large-size TV and 3D TV era and the continuous increase in market demand, plasma has once again become the industry's darling. With the expansion and expansion of domestic and foreign manufacturers, international plasma experts said that plasma will be the mainstream of future display.
Comparative analysis of the characteristics of plasma screen and LCD screen
About clarity
In terms of working principle, PDP technology is similar to ordinary fluorescent lamps and CRT TV color images. It is composed of individual phosphor pixels to emit light, and it is actively luminous. It does not require an extra backlight lighting system, so the image is bright, bright and clear. The LCD screen does not actively emit light, and it is much worse in brightness and contrast.
About perspective
Plasma displays have a wide field of view and a wide viewing angle, which can provide exceptionally bright, uniform and smooth pictures and an unprecedented viewing angle. PDP can achieve a wide viewing angle, greater than 170 degrees up, down, left and right. The viewing angle of the liquid crystal in the horizontal direction is generally about 120 degrees, and the vertical direction is even less.
About response speed
In terms of response speed, plasma TVs have an absolute advantage. Plasma TVs have a microsecond response rate, and LCD TVs have a millisecond level. The response speed of the plasma TV is 2 to 3 microseconds, while the LCD TV currently has a response speed of 8 milliseconds. This response speed will cause tailing when playing fast moving images.
About thickness
The most prominent feature of the plasma display device is that it can be made very thin, and it can easily make a large screen display device of more than 40 inches, and the thickness is generally not more than 10 cm. thickness of. The principle and structure of plasma determines that plasma has inherent advantages in large size, and the plasma panel itself has a simpler structure than liquid crystal, does not require an additional backlight system, and is more conducive to achieving ultra-thin.
About contrast
In a bright environment, the contrast effect of the LCD TV performs well. However, in low-light environments, LCD TVs sometimes suffer from loss of picture details. Especially when watching TV at home at night, the contrast between the two is more obvious, so the contrast effect of LCD TVs is far inferior to that of plasma TVs.
About image distortion
Plasma can be used in a bright environment due to its high screen brightness. It will not affect the image effect due to lighting factors. However, when the local brightness of the LCD screen is not uniform, the corresponding image distortion is often generated.
About sales and marketing
In the 40-inch and above markets, plasma TVs have obvious advantages. Although Sharp has produced 45-inch LCD TVs and started to market, they are not limited by mass production of high-generation LCD panels, and LCD TVs cannot compete with plasma in large size. Compared to TV. In the market below 30 inches, LCD TVs have an advantage over plasma TVs, but currently, there is no plasma TV smaller than 40 inches in the Chinese market.
Plasma screens are also ideal for interactive teaching
Based on the above comparative analysis, the outstanding advantages of plasma screens such as large size, clarity, self-illumination, and multiple viewing angles have proved that plasma screens are also the first choice for interactive teaching. The plasma screens of many brands in the industry are very suitable for the needs of teaching computers and TVs. The CINT interactive teaching series promoted by Xinan Technology (China) Co., Ltd. is a product specially tailored for modern multimedia teaching. From the production process to the functional configuration, it demonstrates the concept of teaching application needs everywhere.
Three Truths about Restoring the Misunderstanding of Plasma Screen
Myth # 1: The plasma screen has high power and consumes electricity. At the beginning of the 20th century, domestic TV manufacturers mainly produced LCD TVs, and imported brands mainly promoted plasma TVs. In the market competition, domestic merchants promoted consumers to buy LCD TVs through the promotion of high plasma power and power consumption. But in fact, it's not. LCD TVs and plasma TVs are currently the most popular flat-panel TV categories, and power consumption should be analyzed by the working principles of these two types of products.
The LCD TV is passively illuminated, with a backlight behind it. After the LCD panel is turned on, the cold cathode fluorescent tubes are behind, which is always bright. By changing the voltage value that stimulates the liquid crystal, the last light intensity and color can be controlled, and Furthermore, different color combinations of different shades can be changed on the liquid crystal panel, and the power will not change due to the display effect. Plasma TVs are actively emitting light, each small pixel is emitting light, and its power is related to the number of light-emitting times, brightness, etc. In the case of all white, each plasma display unit has reached a peak, and the plasma TV consumes more power than the liquid crystal. The TV is high. However, the TV image is white or black, and it does not emit light on the black screen. At this time, the power consumption is only 30 to 40% of that when it is completely white. Considering the balance, in actual operation, focusing on a certain period of time, Panasonic (mainly plasma) and Sharp (mainly LCD) used to compare the power consumption. The two products are basically the same, and the plasma TV also saves some power. Therefore, from the perspective of general users, the power consumption of plasma TVs is not higher than that of LCD TVs.
Misunderstanding 2, the plasma screen image will have afterimages. It is true that screen burn-in and afterimages have plagued plasma TVs for many years. The so-called screen burn-in phenomenon is that if a static image is kept on the screen for a long time, the "ghost image" of the image will be left on the screen, such as the logo of a TV station. In the case of displaying a still picture for a long time, the picture is prone to burn-in. This is a common problem in the initial plasma products. At the initial stage of the development of plasma, unfavorable factors have been laid unfavorable for word of mouth. However, in recent years, with the development of plasma technology, various manufacturers have developed many improved technologies in response to these deficiencies. At present, many plasma display screens are equipped with anti-burn screen functions, such as "screen saver", "pixel transfer", etc., to prevent the phenomenon of screen burn, and users usually do not see these functions. For example, Panasonic Plasma calls it "pixelwobbling" and Pioneer calls it "pixelorbiting" technology, but the functions of both technologies are the same: at a set interval, it is slightly on the screen Rotate the image by 1 or 2 pixels, this change is basically invisible to the naked eye, and many plasma display screens also have corresponding measures to prevent burn-in.
For example, the use of anti-scorching fluorescent pixel technology to solve the screen burning problem; the use of high-purity crystal layer to achieve faster discharge speed and higher luminous efficiency, improve the number of times the screen changes in an instant, and get better Display effect, and effectively solve the problem of screen burning; some when a certain area of ​​the picture remains static for a long time, it can be solved by changing the position of the pixel within a small range and changing the position.
Unlike earlier generation plasmas, those types of afterimages will not disappear and may actually be aging on the screen. Modern plasma TVs have solved the previous problems by combining better quality screen materials with fine image drift technology. The problem.
Samsung offers similar options to consumers with its plasma HDTV. These modes can be invoked through the on-screen menu of their existing 2007 models. They include: pixel drift—adjustable pixel drift; slowly shift the image up or down or left and right To prevent pixel aging.
However, due to the inertia of consumers' inherent cognition and the unfair competition methods of some competitors, the progress of plasma has not been widely recognized.
Plasma TV also has excellent dynamic clarity performance. Since the state control of the plasma tube can be completed in an instant, the reaction speed is only equivalent to 0.002 milliseconds. The high-speed control capability brings about a faster switching and changing effect of the screen. Therefore, the plasma TV has excellent performance in the smoothness of the movement of the screen, and the phenomenon of tailing like the LCD screen rarely occurs.
Misunderstanding 3: The plasma screen generates a lot of heat. Due to the prejudice that the plasma screen consumes a large amount of power, it is natural to think that the heat generation is also large. In fact, we must first figure out the difference between the heat sources of the two. The heat source of the plasma is the screen itself and the driving circuit, and the heat source of the liquid crystal is the lamp and driver at about 2cm behind the screen. The heat source of the plasma can be directly touched, of course it will feel hot, and the heat source of the LCD screen can only be touched by removing the back cover, which is also very hot. The back cover of the LCD is made of plastic. The plastic does not heat up, so the heat is only in the air. The plasma metal back cover is all a heat dissipation version, and it must be very hot to the touch (gas and solid at the same temperature, people will feel the temperature of the solid is high). Therefore, it is unscientific to unilaterally exaggerate the heating error of the plasma screen. (Organized by China Educational Equipment Purchasing Network)
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