Among the many technologies developed for large-screen television, three of which won the hump are the very liquid crystal display (LCD), plasma (PDP) and Digital Light Processing (DLP). These technologies have become obsolete the CRT, the main reason for the size of a CRT monitor. A cathode ray tube is more necessary to create larger displays and, thus, a CRT display greater than about 40 inches is unrealistic size of the television. This is the main reason of the above technologies have gained much support from television companies and have also entered the house of customers due to excellent viewing experience. However, recently released technologies such as Organic Light Emitting Diode (OLED) and yet to be launched technologies such as Surface-conduction Electron-emitter Display (SED) is set to replace the first flat-screen technology in terms of image quality.
The main factors that affect the image quality on a large screen television are given below.
- Screen size means that the length of the diagonal of the television screen.
- The resolution refers to display the count of pixels in each dimension of screen. Higher the score, the sharpest.
- Dot pitch refers to the size of the pixel. This has to be small to yield clearer and sharper images.
- Response time is the time that the pixel to change its color from black to white and then back to black. Faster response time gives a clear image without unwanted image artifacts on grounds that develop when the response time is small.
- Brightness is the amount of light emitted by the monitor and contrast ratio is the ratio between the brightest color to a darker color. Usually a high contrast ratio is obliged to show better.
- The ratio is the relationship between the screen width to screen height. Traditional television screens had a 4:3 ratio, which is being phased out and became 16:9 the norm for big-screen TVs.
- Viewing angle is the maximum angle at which a person can see the image clearly. It is measured from one end the other and the maximum angle is 180 degrees.
Here are three most promising big-screen technologies.
LCD:
Each pixel on the LCD is composed of many layers of plots, which are 2 polarizing filters, 2 glass plates with electrodes and liquid crystal molecules that form the main part. These crystals are sandwiched between sheets of glass and are in contact with the electrodes that supply voltage. The two polarizing filter, one of which is bent horizontally and the other is tilted vertically, form the outer portion of the screen. These crystals have a special feature that makes react in a certain way of temperature and electric current that causes twisting or turning around a specific direction, depending on the intensity of the driver. State Naturally, the crystals are twisted so that the light is allowed to pass through two filters. After the application of electrical current to turn the filters so that the amount of light passing through the filters and thus vary produced varying intensities of light. For a color television in each pixel is composed of three sub-pixels for each primary color. Thus varying intensities of pixels for each sub-chain determines the color and sharpness of the light emitted by the pixel.
Plasma Display:
The screen plasma television is made up of thousands of cells filled with gas (xenon and neon, mainly), which are sandwiched between 2 plates glass, 2 sets of electrodes, a dielectric material and a protective layer. This assembly is in the back of the canvas with a protective layer in direct contact with the cells. The address electrodes are arranged vertically between the rear glass plate and the protective layer. The front side of the screen hosts the horizontal display electrodes sandwiched between the magnesium oxide protective layer and an insulating dielectric. Each cell is separated by a wall so that a cell does not affect the activity of other cell. When voltage is applied to T cells, the ionized gas inside gets UV and emit photons that interact with the phosphor coating on the inside the cell and excite the electrons in them. These electrons fall to a lower level of energy and release excess energy as light. To create a color display each pixel is 3 sub-pixels where each is covered by a red phosphorus, a green phosphor and a blue phosphor. These interactions produce the desired color light.
These technologies have their own advantages and disadvantages. Thorough checking of the product and the promise that the company offers, gives us the best choice.
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