The best monitor tests online. Description of monitor tests Monitor testing online

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 quite fragile. The main trouble that a user may encounter when purchasing a monitor is the presence of dead pixels, that is, screen elements that are not capable of correctly transmitting colors. To avoid such a problem, you need to carefully check it when purchasing a monitor, and in this article we will look at how to do this.

What is a pixel, what are dead pixels?

First we need to tell you a little theory. A pixel is the smallest part of the display that displays a picture. Depending on the display resolution and its diagonal, a pixel may be larger or smaller in terms of physical size.

Please note: Modern monitors can use several million pixels.

If one of the pixels or a group of pixels does not work, the image on this part of the screen will not correspond to the one transmitted to the monitor from the system unit. There are several types of dead pixels:

• Non-working. These pixels do not convey 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 working with RGB colors;
• Constantly glowing pixels. These are pixels that are constantly lit in white.

Please note: Sometimes not just 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 is it important to check your monitor for dead pixels when purchasing?

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 discover such a defect after purchase, it is far from certain that you can return the monitor under warranty. The fact is that there is a standard ISO13406-2, which determines the permissible number of defective pixels for monitors of various classes.

This standard provides for the release to the market of monitors in 4 quality classes. The best class is first, the worst is 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 standard ISO13406-2, the following number of non-functioning or malfunctioning pixels in monitors of various classes per one million pixels in the panel is allowed:

• 1st quality class. There should be no defective pixels at all;
• Quality class 2. No more than 2 permanently lit white pixels, 2 permanently off black pixels, 5 pixels with other defects are allowed;
• Quality class 3. No more than 5 permanently lit white pixels, 15 permanently non-lit black pixels, 50 pixels with other defects are allowed;
• Quality class 4. No more than 50 permanently lit white pixels, 150 permanently non-lit black pixels, and 500 pixels with other defects are allowed.

It is worth noting that the acceptable value of defective pixels does not mean that they are necessarily present on a monitor of one class or another. The quality class of a monitor according to accepted standards is determined by the device manufacturer itself. Depending on what class it determines, additional warranty obligations are imposed on it.

How to check your monitor for dead pixels

When purchasing equipment in a store, you always have the opportunity to check it right on the spot, and in a situation with a monitor, this definitely needs to be done. There are special applications that allow you to check your monitor for defective pixels. Programs are available, both stand-alone 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 they are present on the monitor. Let's look at the main programs and sites that can be used for such a check.

Programs to check your monitor for dead pixels

If you buy a monitor in a store, it is better to first record one of the programs described above on a flash drive in order to perform an on-site test.

Dead Pixel Tester

One of the most famous free applications for checking your monitor for dead pixels. To use Dead Pixel Tester you need to:

Among the program’s capabilities, it should be noted that the function of changing modes can be set to a timer; to do this, you need to check the “Auto Color Cycle” box and set the time in milliseconds. After this, the modes will change automatically.

Another feature of the program is the creation of 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 there is a dead pixel in some part of the monitor, this tool helps to verify this.

IsMyLcdOk

IsMyLcdOk is another application that does a good job of diagnosing dead monitor pixels. The program also does not require installation and can be easily downloaded for free on the Internet. The application weighs very little and works extremely simply.

When you first launch the IsMyLcdOk program, information will appear that describes what you should click to perform the test. To return to the instructions after starting the diagnostics, you will need to press F1.

To test, select the mode using the buttonsF2-F5. Among the monitor test modes available in the IsMyLcdOk program:

• Check BitBlt MB/sec;
• Painted rectangles;
• Painted stripes;
• Durability testing;
• Vertical lines;
• Horizontal lines.

In addition to special modes, it is also possible to simply switch colors or gradients.

Sites for checking your monitor for dead pixels

If you don’t want to download a program to your computer to check your monitor, 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 your monitor for dead pixels.

To use the service you must:

To finish testing the monitor with the service, click on the house icon in the lower left corner of the screen.

Please note: ServiceMonteon, unlike the programs discussed above, has a mode in which looped video is shown. In this mode, you can check the pixel color refresh rate.

Vanity Monitor Test

Quite an old, but well-proven service that allows you to test your monitor. To operate 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 operating mode in the Vanity Monitor Test program is carried out through the drop-down menu at the top.

Treatment of dead monitor pixels

Dead pixels on the screen are not always a death sentence. In some cases, you can get rid of them and make them function normally again. There are several ways to do this:

If none of the above methods helped restore the dead pixel, you will have to put up with it or replace the monitor.

Hello! For those who spend a lot of time at the computer, work comfort is of particular importance. I will not “discover America” for anyone if I say that a monitor is one of the most important components of comfortable and productive work. Many users wonder how to check a monitor for dead pixels, but doing this is as easy as pie.

Today I will tell you how to check your monitor not only for pixels, but also for backlight uniformity and picture blur.

Before starting the tests, let’s take a short digression and get acquainted with the concept RGB color model. RGB is an abbreviation for the English words Red Green Blue. This model is a method of color reproduction that has found wide application in technology. The method is based on the peculiarities of color perception by the human retina. With this model, all colors reproduced by the monitor are output due to a combination of three primary colors - red, green And blue. That is why all tests for monitors work with these primary colors.

Online monitor test

For online testing we need to go to the website - http://tft.vanity.dk

Go to the menu HTML window. In the first window we see a scale of shades of gray, which allows us to compare similar tones. If you can see dark shades in 2% increments on your monitor, then it's a good monitor. On the highest quality monitors, you can see differences between light tones.
Of course, the evaluation of the monitor does not end on this scale. If we move the mouse pointer to the top edge of the browser window, a menu with various test options opens in front of us.

If the window with hints on the screen bothers you, you can turn it off by pressing the button "Info on/off" in the upper right corner of the pop-up menu.

There are a total of 6 tests in the menu, including the main page:

• Color range- color spectrum;
• Trailing- motion blur test;
• Homogenuity- uniform filling of the screen;
• Pixelmapping- pixel map;
• Text- tests with text

Color range

These tests can test your monitor's color reproduction and see its ability to reproduce smooth transitions between different shades. The menu provides 9 color gradient options so you can compare the smoothness of the transition for each of the primary colors. The Black/White item presents a modified test model on the main page.

Trailing

Here's a simple motion blur test. Do not confuse it with game performance tests, which measure FPS - Frames per second - the number of frames per second.

To set an object in motion, you need to press a button "Start box" and just look at the trail that remains behind the object. The shorter it is, the better the monitor. The same menu also contains other tests in which you can move an object with the mouse pointer.

Homogenuity

On this screen we can check the uniformity of the monitor's backlight (against a black background). By switching colors, you can also ensure that the color appears the same across the entire screen.

Also, this test can help in detecting the so-called "dead pixels" since they become very clearly visible against a uniform background.

Pixelmapping

On a high-quality monitor, the screen should be evenly filled with black/white pixels without any colored areas. This indicates that the monitor matrix does not illuminate the color transition boundaries. In addition, the test allows you to determine the absence of geometric distortions.

This test is often used to check televisions.

Text

They will allow you to evaluate the display of different types and sizes of fonts on different backgrounds.

Monitor test using the program

In addition to the online test, there are a huge number of programs for checking monitors. For the most part, these programs contain the same set of tests. Often the differences are only in the interface.

Such a test program is provided by the testing service described above. You can download it from their website - http://tft.vanity.dk The capabilities and interface of this program completely coincide with the online checking functions described above.

Program features:

• test for uniform illumination of the matrix and the absence of “broken dots”;
• color gradient to check matrix linearity;
• circles for checking “non-native” permissions;
• ring gradient to check matrix linearity and discreteness;
• patterns for checking interpolation of “non-native” resolutions;
• checking font readability;
• grid for checking the legibility of parts;
• moving square;
• moving square with a scale grid.

This is where I end my article and I wish you easy work at the computer.

P.S. The best rest after hard work is a walk in the fresh air. Don't forget to take breaks, take care of your eyesight and health.

Monitor testing programs invariably attract the attention of PC users. Perhaps among all information and diagnostic utilities they are the most popular. And all because every user will sooner or later worry about buying a new monitor. Simply choosing a manufacturer and model is not enough. According to the rules, when purchasing a monitor, it is necessary to meticulously test it, especially for dead pixels.

Why we test the monitor:

Monitor testing programs make the task of testing and adjusting a CRT monitor easier. Special test images (templates) make it possible to identify defects such as lack of convergence of rays for different colors, insufficient focusing and voltage stabilization, geometry distortions, low contrast, uneven glow of the phosphor, broken pixels. Having looked at several copies, we can select the one with deviations from standards are minimal.

LCD monitors require a different approach. All LCD panel based monitors cannot have problems with geometry, convergence, stabilization, focus, etc. And the spread of parameters is generally not typical for them, with the exception of “broken” pixels, which are still encountered, despite all the efforts of manufacturers. However, LCD monitors should also be tested. Just not different copies, but models from different manufacturers. LCD monitors differ significantly from each other in such parameters as viewing angles, inertia (afterglow and smearing), natural color rendering, color resolution, brightness and contrast, backlight uniformity. These parameters are either not indicated at all in the characteristics, or are measured using completely inadequate methods.

is an interesting utility for testing monitors, but, unlike others, it offers to check the operation of the screen when changing images. Using PixPerAn, you can identify flaws that may appear due to the inertia of LCD matrices (for example, when viewing a dynamic image, nasty multi-colored trails may remain on the screen). Includes original tests, for example, in the form of a small computer game, moving hand-drawn typewriters, moving text readability test, etc. Movement speed and color can be customized. Plus, PixPerAn provides information about the frame rate per second, dropped frames, processor load and screen parameters.

Today, almost all monitors use the RGB color model for color reproduction - from the English Red, Green, Blue. Each pixel of the screen has three channels - one is responsible for red, another for green, and the third for blue. Mixed with different intensities, they give different colors - the maximum intensity of all three colors gives white, the minimum intensity gives black.

Using special pictures, you can check the presence of dead pixels on the screen of a computer, laptop or TV, color rendition, smooth transition between colors, sharpness, contrast and brightness.

In this article I will tell you how you can check your monitor for dead pixels using special online tests.

Test monteon

Using this test, you can check not only the computer screen, but also the display of your mobile device.

In the address bar of your browser, type monteon.ru. To start testing, click “Start”, if you want to read more about the tests, click "Learn more about tests".

This online test presents various test screens that will help you evaluate the image shown on the monitor. For a full check, go to full screen mode. Using the arrows you can change test pictures. You can also select the necessary tests on the control panel. If you do not move the mouse, the control panel disappears and does not interfere with checking the monitor.

You can check your monitor for dead pixels using the red, green and blue test images presented in the section "Color rendition". There are also images of other colors.

To do this, look carefully at each image presented on the screen. It should not have black pixels. If, for example, in the red color, you find such pixels, this means that the channel responsible for the red color does not work, and such a pixel can be called dead or broken. Accordingly, at such a point, you will not be able to obtain a purple color - mixing red and blue - and the color reproduction of this pixel will be distorted.

Using the monteon test, you can also check the screen for a smooth transition between colors - “Gradients”, alternation of black and white pixels - “Flicker”, image sharpness and clarity of borders for text displayed on the screen - “Sharpness”, brightness, contrast, etc.

In the test description you can read in more detail what flaws you should look for for each image.

Test tft.vanity.dk

Type tft.vanity.dk into the address bar of your browser, the following site will open. To check the monitor online, follow the link "HTML window". If you want to check any other computer, laptop or TV that is not connected to the Internet, follow the link “Executable mode”, download the executive file to a flash drive and run it on any other device.

When you hover your mouse over the top of the window, the main menu appears, represented by seven tabs. If the hint window on the screen bothers you, turn it off with the “Info on/off” button.

The Main page tab displays various shades of gray. Here you can evaluate how well your monitor distinguishes similar shades: if differences between shades are noticeable with a difference of 2%, then the monitor is good.

On the “Color range” tab, you can evaluate the monitor’s reproduction of various colors and the smoothness of the transition between shades. Here you can look at the smoothness of the gradient from black to white, red, green, blue. If you do not see any distinct stripes, then everything is fine with the monitor.

On the “Trailing” tab, you can evaluate how blurry objects of a certain color will be in motion. If a trail remains behind the test square, it’s not a big deal. But the longer it is, the worse the monitor.

To start moving the square, click “Start box”. You can increase or decrease its speed using the “Speed” button. If you want to move it to another strip, click on the small squares in the “Background color” area. To change the shape and color of the square itself, move the sliders in the “Box color” field.

On the “Homogenuity” tab, you can check your monitor for dead pixels. Change the test images represented by black, white, red, green and blue pictures, and make sure that the screen fill is uniform. If colors are displayed normally on the entire screen and there are no black pixels for color pictures, then there are no dead pixels on your monitor.

The “1:1 pixelmapping” tab is great for checking TV screens. The screen is filled with alternating black and white dots. There should not be consecutive pixels of the same color or colored pixels.

On the “Text” tab, you can see the display of a specific text color on any background. The edges of the text should not be blurred.

I will end here. I think now you know how to check your monitor for dead pixels, and more.

When buying a monitor, laptop or TV, there is an indicator that is not advertised by the seller, and most buyers do not pay attention to it. And only after purchase they may wonder what these colored or black dots are on the screen. As you know, the screen consists of dots - crystals, each of which is capable of changing color depending on the signal applied to it. This is how the picture is formed on the screen. There are situations when a crystal either cannot change color from its original black color, or, having received one color, is not able to change it to another. It's time to figure out what checking for dead pixels is, how to identify them and how to deal with them.

Visual inspection - nothing is easier

The simplest and fastest way to check the matrix for dead pixels on a monitor or TV screen is a visual inspection while turning on the device and playing color, dynamic video. If the screen matrix has a dead pixel, it is easy to detect, just look closely at the screen. Pay attention to the dots that do not change color during video playback. The color of such dots can be white, black, red, blue or green. Many stores whose main focus is the sale of television and audio equipment have special generators whose task is to check for dead pixels. The test consists of submitting a sequence of color fills over a certain period of time, which makes it possible to detect a defect in the matrix.

Built-in testing program - a step towards the buyer

Over the past few years, well-known manufacturers, trying to please the buyer, have added specialized functionality to their TVs. Checking for dead pixels on a TV is done using one button. When the program starts, a certain sequence of colors is displayed on the screen; when each color is changed, you can see the dots on the screen that did not have time to change their color. For TVs that do not have a function for checking the screen for dead pixels, you can use other checking methods. For example, launching a special video from an external storage device or connecting the TV to a personal computer or laptop as a second monitor in order to perform a software test.

Specialized pictures and videos will help

Buying a TV, laptop or monitor is often a pre-planned purchase. Reviews on the Internet and popular publications are studied, a list of necessary technical characteristics is determined - more than one day is spent. Checking for dead pixels of the screen matrix can also be planned by the buyer in advance. When buying such an expensive device, you can always find an hour of time to record a set of special pictures or testing videos on a portable memory module, which are stored in huge volumes on the Internet. For example, a video testing the quality of changes in dynamic scenes, called “Japanese woman on a rope.” If watching a video causes discomfort - the image doubles, the image of trees and the girl’s clothes is blurred, then the TV has failed the test. It is important to remember that testing and checking for dead pixels on a TV, monitor or laptop is not comparable in time to what will be spent on warranty repairs or exchange of goods.

Programs for testing

Checking your monitor for dead pixels can be done using third-party software. Do not forget that thanks to the presence of additional video inputs on the TV, you can connect it as a monitor to a computer or laptop, performing testing that is no different from testing a monitor. There are a lot of such programs today. There is a complex test that detects dynamic video distortion, determines the response time of the matrix, and a regular check for dead pixels. The program for any testing does not take up much space and can fit on any storage medium. Among the applications for testing the screen matrix, TFTTest, DeadPixelTester, Nokia Monitor Test and the popular online test tft.vanity.dk have proven themselves. The test of any device is carried out only when the screen resolution is set to the manufacturer’s recommended one.

Pitfalls that few people know about

Checking your monitor for dead pixels is fundamental, but does not address some of the other pitfalls that a user may encounter when purchasing a device. Most LCD screens have factory defects, which the average user is not even aware of, attributing it to poor-quality video recording.

1. Tint - white balance. To identify this defect, you need to display a static white sheet on the device screen. Stripes, spots of different shapes and shades will indicate the presence of a defect.
2. Banding - appears on a static background of any color in the form of light and dark stripes.
3. Lights that are typical only for LED TVs. They are detected in a dark room when either a black picture or white text on a black background is presented on the screen. The light on a black background has white blurs. If the background is black with text, then the text itself blurs.

What about the guarantee?

Yes, you can exchange equipment under warranty, but there are some requirements that you need to know.

1. If, within fourteen days from the date of purchase of the device, dead pixels are found, you can, without a twinge of conscience, if you have a purchase receipt, return the equipment to the seller, under the guise of the law “On the Protection of Consumer Rights.”
2. Using the manufacturer's warranty, you can exchange equipment in the store, according to the classification. For first-class devices, such as Pioneer and DreamVison brands, one dead pixel is enough. For Class 2 devices such as Panasonic, Sharp or Hitachi, the dead pixel test should show 5 to 10 defects. The most popular third class with well-known brands LG, Samsung, Philips, Sony requires a minimum of 50 dead pixels.

Don't despair - massage can solve the problem

If you were unable to exchange your device under warranty, you can try “artisanal” methods for eliminating dead pixels. There are two ways to solve the problem.

1. Having previously determined the location of the broken pixel and disconnected the device from the network, you can try to restore the operation of the crystal using a physical massage of the defective area with a cotton swab. The probability of restoration is low, but sometimes it eliminates manufacturing defects.
2. Using a special program, if checking for dead pixels shows a defect, you need to connect the monitor or TV to the computer and try to restore the operation of the crystal using a hardware massage. Manufacturers of massage programs claim that there is a high probability of solving problems. As an example: such programs include Bad crystal, JScreenFix, Pixel Repair.