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How to eliminate beaten pixels on the LCD monitor?
|/img >/img src="//images/stories/tip/comp-progs/bad-pixel-fix-1.jpg" alt="How to eliminate beaten pixels on the LCD monitor?" align=left title="Как устранить битые пиксели на ЖК-мониторе?" /> Probably, you already know that the image on the screen of the monitor is under construction of color points – pixels. Than more small these points and than their is more per unit area than the screen – the quality of the image is higher. However even the good monitor is not insured from one small, but very difficult problem – "beaten" pixels. What is the "beaten" pixels and whether it is possible to get rid of them?|
In liquid crystal as however and in electron beam monitors, each pixel is formed by means of three subpixels of strictly certain color: black, red and green. To receive pixel of necessary color, the provision of separate subpixels, and also the direction of a light beam and its power changes.
The "beaten" pixel on the liquid crystal monitor appears if the thin-film transistor under control of which it is is faulty. In this case the "beaten" pixel looks as a black inactive point which does not react to change of images. Such "dead" pixel cannot be corrected in house conditions, after all replacement of the faulty transistor is necessary.
But there is also other type of "beaten" pixels are light points which are well visible against a dark background. Such pixels turn out if one of subpixels as if "got stuck" in a certain situation. Then against that color in which "got stuck" pixel, it is absolutely imperceptible. Therefore to reveal a similar problem at first sight quite difficult.
To find "beaten" pixels, it is necessary to carry out a certain inspection. There are special utilities (for example, Nokia Monitor Test) which test the monitor for existence of such pixels. The essence of action of these utilities is that monophonic pictures of different flowers are offered the user. Switching colors, the user visually estimates, whether there are on the beaten screen pixels.
At a choice and purchase of the monitor similar utilities can be written down on a disk or the flash-store and to carry out an inspection directly in shop. After all the producer allows existence of several beaten pixels on the products. The maximum quantity, and also types of "beaten" pixels are established by the ISO-13406 standard. So, pixels of the first type are white on a black background, the second type – black on a white background, the third type – color pixels (red, green, blue).
According to this standard monitors can be divided into four classes. The first class does not allow existence of beaten pixels at all. The second – resolves 2 defects of 1 and 2 types, and also 5 defects of the third type. On displays of the third class can be to 5 defects of the first type, to 15 – the second and to 50 – the third type. At last, the fourth class of monitors resolves on 50, 150 and 500 defects of the first, second and third types respectively.
The "got stuck" pixels, unlike "dead" it is possible to try to restore programmatically or by mechanical manipulations.
The essence of a mechanical method consists in physical impact on the "got stuck" pixel owing to what it "becomes" into place. For this purpose it is necessary to mass softly defective area of the display a suitable subject, it is best of all a Q-tip. By fingers or any sharp subjects it is impossible to do "massage" is can damage an antiglare covering of the display.
Before this procedure it is necessary to switch-off the monitor. Some minutes of "massage" later it is necessary to include it and to look at result. It is necessary to repeat procedure several times.
One more option of "massage treatment" - to use a stylus from a PDA. In this case the screen needs to be covered with a pure paper napkin or a rag. The stylus needs to be put as it is possible more precisely on defective pixel and, without moving away him, to switch off the monitor. Further it is necessary to press slightly on "beaten" pixel and again to turn on the monitor. To stop pressing. If from the first it did not turn out, it is possible to repeat this cycle once again, changing force of pressing and accuracy of positioning of a stylus.
Such ways do not give 100% of a guarantee, besides, there is a risk that pressing will be too strong and will be damaged next with "got stuck" pixels. Therefore before taking "extreme measures", it is possible to try to correct a situation programmatically.
Small cunning. If to disconnect the monitor from all cables and wires connecting it to the computer and a network and to wait some days, all condensers of the monitor have to be discharged completely. After that at inclusion the "got stuck" pixel will start normally perhaps over again to function.
For program elimination of "beaten" pixels there are different utilities. One of them – jscreenfix which is available to users in the online mode directly from the site of developers. After start, it is necessary to guide a program window at defective area of the screen and to leave the program to work not less than 20 minutes. If 20 minutes later the "beaten" pixel was not removed, it is possible to try to start the program for 5-10 hours.
The program carries out high-speed change of flowers of separate pixels that allows to level the got stuck pixel.
Thus, some types of "beaten" pixels nevertheless will respond to "treatment". However, that after it was not necessary to be whipping the cat from disappointment, it is necessary to treat more attentively a monitor choice upon purchase and always to demand from the seller of carrying out testing for "beaten" pixels.
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