[96] plasma TV set

Principle of plasma TV display

The plasma display panel is a display device that uses gas discharge. This screen uses a plasma cavity as the luminous element. A large number of plasma chambers are arranged together to form a screen. The plasma display screen is composed of two glass panels several hundred meters apart, isolated from the air. Each plasma cavity is filled with inert gases such as neon Xenon, the gas in the plasma cavity between two layers of glass will produce ultraviolet light, which inspires the red, green, and blue phosphor on the flat display screen to emit visible light. Each ionic cavity acts as a pixel, and its working mechanism is similar to that of ordinary fluorescent lamps. The combination of light and shade and color changes of these pixels produces a variety of gray and color images, while TV color images are made up of independent pixel light.

Advantages of plasma TV

Compared with traditional CRT TVs, the most prominent feature of PDP TVs is "Big and thin". Other features are as follows:

(1) thin and light structure

Because the PDP display module is thin and light, it determines the overall structure of the display. At the same time, it does not need to increase the screen size.

(2) wide view

The PDP can have the same width as the CRT, with the upper and lower sides greater than 160 degrees. The horizontal angle of LCD is generally 120 degrees left, while the vertical direction is less.

(3) Anti-electromagnetic interference

Due to the differences in display principles, electromagnetic interference from the outside, such as motors and speakers, has almost no effect on PDP images. In contrast, CRT is much more susceptible to electromagnetic interference.

(4) non-distorted flat-screen images

The RGB raster of PDP is evenly distributed on the plane, but the interior surface of the flat CRT is non-flat, which may cause typical pillow distortion. In addition, when the local brightness of the screen is uneven, the CRT will usually produce the corresponding image distortion, which is not the case with PDP.

(5) No problem of aggregation and focus

Plasma TV is a high-tech and cutting-edge electronic product, which is unfamiliar to many customers. Many people are cautious when using it because they do not understand its principles, thus, you cannot fully enjoy the plasma TV. In fact, the service life of plasma TVs is about twice that of normal TVs. If the service life of an ordinary TV is 10 years, plasma can be used for about 20 years, and plasma TV is superior to ordinary TV in display, color, appearance, and many other aspects, therefore, plasma TV is the future direction of television development.

In use, it is the same as the use of ordinary TV, generally do not pay special attention to anything (unless indicated on the instructions), because the plasma TV mirror has a special coating, do not use water or chemical solutions to wipe the mirror while cleaning. Use a clean soft cloth to wipe the mirror. Try to avoid damages to the mirror from other substances.

Disadvantages: R, G, and B phosphor are used for self-illumination, and images are displayed in fixed pixel addressing mode. Residual images are easily generated when high brightness and high contrast static images are displayed for a long time, the screen may even be burned. When you watch a TV, minimize the brightness and contrast of the TV without affecting normal watching.

Working principle of plasma TV (PDP)

The plasma display screen is a display device that uses gas discharge. The screen uses a plasma tube as the luminous element. A large number of plasma tubes are arranged together to form the entire screen. Each plasma tube acts as a pixel, and each pixel is composed of three different colors of luminous bodies-red, green, and blue. Various gray and color images are generated by the variation of the light and shade and color combinations of these pixels, which is similar to the principle of CRT. The central component of the plasma tube is the plasma, which is composed of free flowing ions (charged atoms) and electrons (particles with negative power. Normally, a gas is mainly composed of uncharged particles. That is to say, a separate gas molecule includes the same number of proton (positively charged particles in the nucleus) and electrons, A negative charge and a positively charged proton maintain a perfect balance, so the net charge of the atom is zero.

If some electrons are put into the gas by means of increasing the voltage, then it will immediately change, free electrons collide with atoms, and the number of electrons inside the atom is unbalanced, this will bring a positive charge and produce ions. In a stable plasma, if there is a current passing through it, the negative particles will rush to those areas with positive particles, and the positive particles will also go to those areas with Negative particles.

In this movement, the particles on both sides are constantly hitting each other. These collisions inspire the gas atoms in the plasma, causing them to emit light. This works like a common fluorescent lamp.

On the plasma display screen, each Chamber corresponding to the plasma is filled with neon and xenon atoms, which emit light when they are hit. Generally, the light emitted by these atoms is only ultraviolet light, which cannot be identified by human eyes. However, these ultraviolet rays stimulate the visible light.

The development of plasma TV

Over the past 75 years, a large number of mainstream televisions have been manufactured by the same technology, namely, cathode ray tubes (CRT ). CRT is mainly composed of Electron Gun, deflection coil and cathode ray tube. Because the cathode ray tube is made of glass, it is very fragile, and the screen jitter is imperceptible, but its fatal weakness is not the above, but its size is too large. One rule of CRT technology is that the larger the screen area, the longer the tube will be. Only in this way can the scanning electron gun have enough depth space to hit the whole screen.

The new pdp TV began to seize the market and become the spokesperson for the new generation of Fashion TV. The new TV has a display screen as wide as a TV produced based on CRT technology, but its thickness is only about 10 cm. The formation of PDP images mainly depends on the brightness produced by the high-energy electron beam hitting millions of small dots (we call it "pixels") on the screen. On most TVs, three (red, green, and blue) pixels are evenly distributed across the screen. All colors can be mixed by a proper proportion of the selected three kinds of monochrome light, and the vast majority of the color light can be divided into a specific three monochrome light. These three colors are called primary colors. primary colors are independent of each other. Any of these colors cannot be obtained by mixing the other two colors, but they are mixed in different proportions, you can get different colors.