Plasma flat panel TVs
Basics of imaging in plasma TV
The principle of the plasma television is similar to the principle of the conventional fluorescent light bulb . The plasma panel consists of a large number of bulbs – cells. Inside each cell formed by two glass plates in the manufacturing process panel pumped neon- xenon gas mixture , necessary for the plasma formation . During the operation of the TV , this gas is a certain electrical charge , discharging , makes glow red , green and blue phosphor elements . Each of these three elements form the pixel (born pixel, picture element ) – the smallest component of the image obtained in this way on the TV screen.
Unlike plasma technology conventional CRT television sets based on cathode ray tube (CRT ) . CRT represents the high vacuum cone , wherein the electron beam emitted from one point in the narrow tube portion ( socket ) , a high speed scans the opposite surface where illuminates the red, green, or blue phosphor elements needed to construct an image .
The main advantage of plasma technology over CRT technology is that they allow you to reduce the size of the TV.
The service life of plasma TVs
It is believed that the loss of 50% of the brightness of plasma panel occurs after 30,000 hours of use ( in the latest models up to 60,000 ) . Thus, if a plasma TV operates for 8 hours per day , the time of ” half-life ” of about 9 years, with an operating time of 4 hours in a day – 18, and the later models – 18 and 36, respectively. Moreover , Panasonic today announced a period of ” half-life ” of some of its models up to 100,000 hours. This means that if the TV is for 6 hours a day, the picture quality will be quite acceptable for about 40 years. In any of the cases mentioned above, the stock brightness of plasma panels should last for a long time.
For the record , the loss of 30% of the brightness of a TV set is reached , approximately, after 20,000 hours of use . Since the process is a gradual loss of brightness for the viewer it remains invisible. We just need to occasionally adjust the brightness and contrast levels to compensate for this loss.
Influence of high altitude on the job Plasma TV
The reduced air pressure at high altitudes could have a negative effect on the plasma TV, since plasma is a hermetically sealed glass case inside which the gas is discharged .
Since the calibration and setup parameters of plasma panels is relatively high sea levels, the external pressure drop with increasing altitude makes the plasma TV to work more hard mode to compensate for the difference in pressure . As a result , increasing the heating system, increases energy consumption , reducing the life of the TV. Besides, the temperature increase inside the housing to rotate causes more cooling fans (if provided) , which in turn may cause occurrence of extraneous noise ( buzz ) .
Most models of plasma TVs is quite stable working at heights of up to one kilometer above sea level. To view a plasma TV at an altitude of more than 1 km . above sea level , it makes sense to consult with the manufacturer of the device ( for example, through its authorized dealer ) about how the model behaves in such conditions. If you find that a plasma TV is not recommended to be used at high altitudes, you can select the TV , which employ other technologies such as liquid crystal ( LCD ) or projection (technology DLP).
Basic standards of plasma TVs
Almost all current models of plasma televisions are available in standard HDTV, that is, high-definition , which is not the older models . The TV was classified as an HDTV-Ready, he should be able to display a picture of not less than 1280×720 pixels. ” Low cost ” model ( the ones that sell for $ 1000 and less like ” hot cakes ” ) have been granted , mostly , 852×480 and 1024×768 pixels. These TVs are standard EDTV ( enhanced definition ) and have a high enough quality image. Therefore , when purchasing if you want to buy a TV is high-definition HDTV is necessary to pay attention to the specifications of the machine . Read more here …
Thus, if the input standard television EDTV signal is high definition HDTV, then the signal is converted from deterioration . This should be considered .
Features of operation of plasma TVs
In order to most effectively utilize the potential of the plasma TV to its owner need to consider some important circumstances, such as :
1. Location and method of placement of the plasma TV . Usually it’s either a special floor stand (stand ) or wall mounting (brackets ) .
It is necessary to take account of this fact , the working heating apparatus, power consumption because a plasma TV , depending on the diagonal can be up to 600 Watts ( 60- inches) . This is normal , but you can not overheat , that is, there must be adequate for normal cooling system, air circulation. In the ” User’s Guide ” are given more guidance on this subject .
2 . Input sources . This may be a DVD and Blu-ray players, VCRs , video game console, satellite receiver or cable box , and the output of the computer video card .
It should be noted that the plasma television is able to work with practically any type of connection , however, the video signal standard VHS, video recorders used has a low resolution, poor color interaction . Therefore obtained in this way on a large screen (over 32 inches ), the image may look worse than a more conventional screen (20-25 inches) .
3 . Audio system . Most plasma TVs have built-in speakers , but for the most complete viewing experience we recommend connecting the TV to a home theater audio system .
4 . Surge Protection mains voltage.
5 . Connecting cables for connecting external devices.
Most plasma TVs have a built-in internal tuner capable of receiving broadcast television signals of different formats , but some models do not have built-in tuner and are called monitors ( screens ) . However, such devices may be connected to an external tuner , such as cable or satellite television. To view the TV broadcasting transmissions made at regular antenna tuners can also be used VCRs and DVD recorders.
In conclusion, a few words about the so-called ” not burning ” and ” always lit ” pixel elements ( subpixels) . They manifest themselves in the form of bright and dark pixels on the screen and the TV works are the result output pixel structure fails due to a number of reasons. Due to the fact that such a pixel element can not be repaired , with the appearance of a large number of elements necessary to replace the entire plasma panel . But that’s another story.