How to choose a video monitor

LCD panel is very important

In security monitors, the LCD panel largely determines the monitor's brightness, contrast, clarity, and more. Therefore, many aspects such as its output, pros and cons, and market environment will affect the quality of the product. Therefore, when we choose the monitor, Xiaobian recommends that you choose the best-known brand, so that both in terms of technology maturity, as well as the quality of their own mastery, etc., have a more comprehensive understanding. It is helpful for quality assurance.

Today, the LCD panel can be divided into three levels according to the quality of ABC. Although there is no hard rule, but usually the number of panel dead pixels is A within one, and more than three are C, only Very few manufacturers who dare to make promises without bad faith will claim to be A+ products. Therefore, when shopping, consumers must personally and meticulously inspect the picture quality of products, especially those products that claim to be A+, so as to avoid being defrauded by unscrupulous vendors. Go for more money.

Display ratio selection

Currently, as with television, there are many screens for monitors. The display sizes commonly found in the market today include 17-inch, 19-inch, 20-inch, 32-inch, 42-inch, and larger screen sizes. In the aspect ratio of the screen, it is also divided into 16:9, 4:3, or 5:4 ratios. Perhaps for some users, this may just be a choice of size or monitoring habits. In fact, it is not. As with the monitor device, the front-end surveillance camera also has a fixed aspect ratio at work. If the front-to-rear aspect ratio is difficult to match, the displayed image may be distorted or deformed, which may affect the monitoring effect.

At present, although the aspect ratio of the monitor is numerous, from the perspective of the application, the ratio of 16:9 is recognized by most current surveillance cameras. Similar to 720p*1080i such as high-definition network cameras, basically recognized 16:9 format. In the long run, 16:9 is likely to become the mainstream of surveillance cameras in the future. When we select equipment, the ratio of 16:9 should be worthy of special attention.

Imaging performance

Before we introduced how to purchase a surveillance camera, we often recommend that consumers must make decisions based on actual conditions after making actual comparisons. In fact, the same is true for monitors. However, the contrast is easy, but in the process of actual operation and observation, what should be the focus?

Reference factors for imaging parameters

Resolution

For the choice of resolution, we also do the case with a 16:9 screen ratio. At present, this widescreen design has a physical resolution of 1368*768. For this parameter, we can use the signal generator to input the sharpness test signal, and then observe the displayed correlation line number to observe whether it meets the requirements of this level of quality. In addition, we can also set up a high-speed moving object in the monitoring before the monitoring of the camera, so you can see the monitor's reaction rate, and whether the tailing phenomenon and so on.

Reaction time

Saying the relevant time, we can look at the current level of a corresponding time. At present, the response time has become more and more an important selling point for monitor manufacturers. In the camera work project, if you want to achieve the best monitoring results, the reaction speed of 60 frames/second is difficult to achieve. And such speeds can be satisfied only within 16ms.

However, we do not have to worry about the current mainstream monitor response time has basically reached the level of 8ms, which can meet the 125 frames / second processing strength. However, 12ms or 16ms products are actually sufficient for users who do not have high demand. Especially for some low-speed dome cameras that often specify points, 8ms is somewhat wasteful.

The choice of brightness and contrast

When we select the monitor, we often see a choice of brightness and contrast. What kind of reaction is these two parameters? In general, the higher the brightness of the LCD monitor, the brighter its color and the better the actual display. For those products with relatively low brightness. The image it displays will also be darker, increasing the user's fatigue. At present, the brightness of an ordinary monitor is around 250cd/m2, and too bright and too dark will affect the imaging.

The stability of the monitor

The brightness is said to be the contrast, after all, the contrast value comes from the white screen brightness divided by the black screen brightness results. Therefore, the greater the gap between the two, the clearer the picture displayed, and the stronger the sense of truth. Under normal circumstances, the contrast ratio of the LCD monitor is around 3000:1, and the contrast of the conventional CRT monitor is much lower than that of the LCD screen. However, for the monitor, the 400:1 is basically approaching the contrast of the monitor. When the contrast ratio is lower than 300:1, the monitor can be ignored.

Observation at a viewing angle

In fact, for the viewing angle, this is a new reference direction in the monitor field. Since the light of the LCD monitor is emitted vertically through the liquid crystal at a nearly vertical angle, when the screen is observed at different angles, the color of the screen changes greatly. This problem will not be encountered with traditional CRT monitors.

In the observation, the viewing angle can be divided into horizontal angle and vertical angle. When choosing a monitor, a larger monitoring angle is undoubtedly the best choice. Although the current viewing angle may not be the same under many brands, it is absolutely the same as the monitoring evaluation standard.

The stability of the monitor

In fact, when it comes to stability, I am afraid that everyone will feel that this should be the most important thing for everyone, but it is also one of the most helpless places. If stability is "looked out" from the air, then this statement is indeed a bit exaggerated. However, on the surface, there are indeed several small areas that can help extend the useful life of our equipment more or less. For example, the bad point of the monitor mentioned at the beginning of the article, or whether there is anti-jamming function Shell, good cooling effect, and advanced cooling fan and temperature control mode and so on. In addition, the screen application technology can also be used as an object of understanding.

These are the main points of attention when selecting an LCD monitor. Actually, according to different needs, the monitor has a lot of attention when it comes to purchasing. Here is just to point out some more important information for everyone. I hope that everyone will be able to buy a suitable monitoring device for them on the basis of understanding. Since this is a monitor, then let's let it show more domineering than TV. Are you saying yes?