A program for detecting "broken" pixels on liquid crystal monitors. The negative quality of LCDs is the possible presence of defective pixels. Such a pixel can have various errors in the display of red, green and blue colors, and can also be illuminated or darkened. To identify such defects, the Dead Pixel Tester program is used. It provides a simple and reliable way to test monitors at home.
Dead pixel tester fills the entire screen area with a user-selectable color, making the corrupted pixel clearly visible. This kind of dot does not represent any negative action on the monitor, but it contributes to additional eye strain for the user.
Program status: Free of charge
Operating system: Windows Vista, XP, 2000, 7
Interface: English
Developer: Data Product
The size: 272 kB
DOWNLOAD FROM THE DEVELOPER'S SITE
A little digression into the problem:
It would seem, what is the problem? If the transistor does not work, then the equipment can be repaired or exchanged under warranty. However, the technology for the production of panels is so complex that it is impossible to obtain large batches of panels without dead pixels. And if only "clean" panels went into production, the cost of TVs would be very high.
Therefore, "dead pixels" are divided into three types, and all panels are divided into 4 classes (specified in the ISO-13406 standard).
Type 1 - white pixel on black background
not.
Type 2 - black pixel on a white background.
Type 3 - colored (red, blue, green, yellow).
First grade
does not allow the appearance of "dead pixels"
Second class
allows the presence of 2 defects of types 1 and 2, as well as 5 defects of type 3. This class is the most common in the TV market. Therefore, the presence of up to five defective pixels, according to the manufacturers, is NOT a MARRIAGE.
Third class
- may have five dead pixels of type 1, 15 of type 2 and 50 defects of the third type.
Fourth grade
- allows the presence of 50, 150 and 500 defects of types 1, 2 and 3, respectively.
Determining the presence of "dead pixels" by eye when watching TV programs or DVDs is often difficult or even impossible. For example, a stuck pixel may only appear as a green dot on a red background and in the corner of the screen. You can watch TV for a long time and not notice it, since the dot is small, and the image changes quickly enough and the combination of these very colors in this place is not often found. In addition, "dead pixels" can appear over time as a result of the breakdown of the transistor responsible for this point on the screen.
programs, and you have a flash with a program!
Based on materials from softportal.com, dataproductservices.com
Compiling text and links
Monitor testing programs invariably grab the attention of PC users. Perhaps, they are the most popular among all information and diagnostic utilities. And all because each user will sooner or later attend to the purchase of a new monitor. Just choosing a manufacturer and model is not enough. According to the rules, the monitor at the time of purchase must be meticulously tested, especially for dead pixels.
Why we are testing the monitor:
Monitor test programs make it easy to test and tune a CRT monitor. Special test images (templates) allow you to identify such defects as lack of convergence of rays for different colors, insufficient focusing and voltage stabilization, geometry distortions, low contrast, uneven glow of the phosphor, dead pixels. norms are minimal.
LCD monitors require a different approach. All LCD monitors should have no problems with geometry, convergence, stabilization, focus, etc. And the scatter of parameters is generally not characteristic of them, with the exception of "broken" pixels, which are still found, despite all the efforts of manufacturers. However, LCD monitors should be tested as well. Not just different specimens, but models different manufacturers... LCD monitors differ significantly from each other in such parameters as viewing angles, persistence (afterglow and "blur"), natural color reproduction, color resolution, brightness and contrast, and uniformity of backlighting. These parameters are either not indicated at all in the characteristics, or are measured using completely inconsistent methods.
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The user consumes information through a monitor or laptop screen, so the presence of defects on it is unacceptable. The monitor itself is a fairly simple device, but at the same time it is quite fragile. The main trouble that a user may encounter when buying a monitor is the presence of dead pixels, that is, such screen elements that are not capable of correctly transmitting colors. In order not to face such a problem, you need to carefully check it when buying a monitor, and in this article we will look at how to do this.
Table of contents:What is a pixel, what are the dead pixels
First you need to tell a little theory. A pixel is the smallest part of the display that can display a picture. Depending on the resolution of the display and its diagonal, the pixel can be larger or smaller in terms of physical dimensions.
Please note: Modern monitors can use several million pixels.
If one of the pixels or a group of pixels does not work, on this part of the screen the image will not correspond to the one transmitted to the monitor from system unit... There are several types of dead pixels:
- Non-working. These pixels do not represent the image, and they are always black;
- Stuck pixels. Most often these are pixels that are stuck in blue, red, or green. They are not capable of handling RGB colors;
- Constantly glowing pixels. These are pixels that are solid white.
Please note: Sometimes not one pixel fails, but a group of pixels in a horizontal or vertical stripe, or “squares” of pixels, for example, 5 by 5 or 10 by 10 elements, are damaged.
Why it is important to check the monitor for dead pixels when buying
When purchasing a new monitor or laptop, be sure to immediately check for dead pixels in the store. This is due to the fact that if you find a similar defect after purchase, then it is far from the fact that the monitor can be returned under warranty. The fact is that there is a standard ISO13406-2, which defines the permissible number of defective pixels for monitors of various classes.
This standard provides for the release on the market of monitors in 4 quality classes. The best class is the first, the worst is the fourth.
Please note: Almost all mass-produced monitors are produced according to the second quality class, respectively, according to the standardISO13406-2 implies the presence of dead pixels.
According to the standard ISO13406-2, the following number of non-working or incorrectly working pixels is allowed in monitors of various classes per one million pixels in the panel:
- 1 class of quality. There should be no defective pixels at all;
- Quality class 2. No more than 2 permanently lit white pixels, 2 permanently unlit black pixels, 5 pixels with other defects are allowed;
- Quality class 3. No more than 5 permanently lit white pixels, 15 permanently unlit black pixels, 50 pixels with other defects are allowed;
- 4 class quality. No more than 50 permanently lit white pixels, 150 permanently unlit black pixels, 500 pixels with other defects are allowed.
It should be noted that the permissible value of defective pixels does not mean that they are necessarily present on a monitor of a particular class. The quality class of the monitor according to accepted standards is determined by the manufacturer of the device itself. Depending on which class it determines, additional warranty obligations are imposed on it.
How to check the monitor for dead pixels
When purchasing equipment in a store, it is always possible to check it right on the spot, and in a situation with a monitor, this must be done. There are special applications that allow you to check your monitor for defective pixels. Programs are available, both standalone and presented on various sites.
The principle of operation of all programs for checking the screen for dead pixels is identical. The entire working area of the display is filled with a single color, a group of colors or a gradient, which allows you to see dead pixels, if any, on the monitor. Let's consider the main programs and sites that can be used for such a check.
Programs for checking the monitor for dead pixels
If you buy a monitor from a store, it is better to pre-record one of the programs described above on a USB flash drive in order to perform an on-site check.
Dead pixel tester
One of the most famous free apps to check the monitor for dead pixels. To use the Dead Pixel Tester program you need:
Among the capabilities of the program, it should be noted the possibility of setting the function of changing the modes on a timer, for this you need to check the box "Auto Color Cycle" and set the time in milliseconds. After that, the modes will change automatically.
Another feature of the program is to create a limited area on the screen with constantly changing colors. To create it, you need to click on the "Exerciser" button, after which the corresponding square area will be created. It can be dragged with the left mouse button. If there is any doubt that a dead pixel is present in some part of the monitor, this tool helps to make sure of this.
IsMyLcdOk
IsMyLcdOk is another application that does a good job of diagnosing dead pixels on a monitor. The program also does not require installation and can be easily downloaded from the Internet for free. The app is very lightweight and very simple to operate.
When you start IsMyLcdOk for the first time, information will appear that describes what to click to test. To return to the instructions after starting the diagnosis, you will need to press F1.
To test, select the mode with the buttonsF2-F5. Among the monitor check modes available in the IsMyLcdOk program:
- BitBlt check MB / sec;
- Painted rectangles;
- Painted stripes;
- Durability check;
- Vertical lines;
- Horizontal lines.
In addition to special modes, it is also possible to simply switch colors or gradients.
Websites for checking the monitor for dead pixels
If you do not want to download a program to test the monitor on your computer, you can use sites with similar functionality. Let's consider a couple of options.
Please note: Sites for checking the screen for dead pixels are convenient to use, for example, when testing tablets or smartphones.
Monteon
A simple and functional service for testing a monitor for dead pixels.
To use the service you need:
To finish testing the monitor with the service, in the lower left corner of the screen, click on the house icon.
Please Note: ServiceMonteon, in contrast to the programs discussed above, has a mode in which a looped video is shown. In this mode, you can check the refresh rate of the pixel color.
Vanity monitor test
A fairly old, but well-proven service that allows you to test the monitor. For work of this service you will need to have Adobe Flash Player on your computer, which can be considered a disadvantage. To start testing, you need to click "HTML Windows".
The choice of the operating mode in the Vanity Monitor Test program is carried out through the drop-down menu at the top.
Treatment of dead pixels of the monitor
Broken pixels on the screen are not always a sentence. In some cases, you can get rid of them and make them work again in standard mode. There are several ways to do this:
If none of the above methods helped to restore the dead pixel, you will have to put up with it, or replace the monitor.
Any malfunctions in the operation of equipment are extremely unpleasant and often lead to serious consequences up to a complete loss of performance. To detect problems in a timely manner and prevent possible difficulties in the future, it makes sense to use a specialized software... The most worthy representatives of this category of software are presented in this material.
Free software product of Russian developers, which contains all the necessary tests that allow for a full diagnosis of all the most important characteristics of the monitor. These include displaying colors, varying levels of brightness and contrasting images.
In addition, in the main window of the program, you can get general information about all devices responsible for graphical display.
PassMark MonitorTest
This representative of the described category of software differs from the previous one primarily in that there are complex tests that provide the fastest and most complete check of the monitor's performance.
Also a very significant feature of PassMark MonitorTest is the ability to diagnose the state of touch screens. However, unlike competitors, this program is paid.
Dead pixel tester
This program is designed to detect the so-called dead pixels. To find such defects, tests are used that are similar to those present in other representatives of this software category.
The results of the equipment research can be sent to the website of the program developers, which, in theory, can help monitor manufacturers.
If you have any suspicions about the correct operation of the monitor, it would be wise to use one of the software products described above. All of them can provide a decent level of testing of the main parameters and will help to detect any defects in a timely manner, while they can still be corrected.
