Plasma TVs are becoming more and more popular with buyers. The principle of their operation is similar to the principle of operation of LCD TVs, although it differs from it. Plasma TVs are based on technologies that provide clear and high-quality images.
Instructions
Step 1
The main element of a plasma TV is the plasma itself, a gas that consists of ions and electrons. When a charge of electricity is passed through it, negative particles tend to the positively charged region of the plasma. Positive particles tend to the negatively charged region. The result is a huge number of collisions that excite the gas atoms in the plasma, leading to the release of energy photons. Neon and xenon atoms are used to release these photons in televisions. These ultraviolet photons are then used to generate visible light.
Step 2
Plasma TV screen consists of two flat glass plates, between which are hundreds of thousands of cells filled with gas. In addition, there are electrodes between these plates. The so-called vertical or addressable electrodes are located behind the gas cells, and the horizontal electrodes are located in front of these cells. These electrodes are distributed over the entire surface of the screen and form a grid.
Step 3
To ionize the gas contained in the cell, the TV charges the electrodes that cross it at the top and bottom. This happens very quickly and often, several thousand times in a split second. As a result, an electric current flows through the gas cell, which sets in motion charged particles, as a result of which the atoms of the gas release photons of ultraviolet light.
Step 4
The inner wall of the gas cells is covered with a layer of phosphor, a substance that emits light when exposed to electromagnetic radiation. When the formed ultraviolet photons hit this layer, photons of visible light are emitted, which make up the image on the TV screen. Phosphors are present in cells (pixels) as subpixels and have different colors (red, blue and green). Combinations of these colors give the overall color of the cell. By increasing or decreasing the intensity of individual subpixels, the colors of the entire visible spectrum can be obtained.
Step 5
The main advantage of plasma TVs is the ability to produce very large screens. In addition, the thickness of such screens, unlike CRT screens, is very small.
Step 6
One of the main disadvantages of plasma screens is the intolerance of long-term static images, which lead to rapid screen burnout. Therefore, it is not recommended to use such TVs as computer monitors. The image quality in some cases can be inferior to the images obtained on the best monitors on CRT, but it still remains high.
