In the article from the day before yesterday, we summed up the many performance differences between TV sets and monitors. From these comparisons, we can see that if you replace the monitor with a TV, it obviously does not work. Therefore, if you want to complete high-quality video surveillance, it is obviously "not running" to pick a high-quality qualified video monitor. Then, how can we polish our eyes and choose from? Why not let our expected monitors fall to the "TV level"? Below, Xiaobian specifically summed up the focus of some video monitors. Come together to defend the quality of the system.
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LCD panel is very important
In security monitors, the LCD panel largely determines the brightness, contrast, sharpness, etc. of the monitor. Therefore, its production, quality and market environment will affect the quality of the product. Therefore, when we choose monitors, Xiao Bian suggests that you should choose a well-known brand, so that you have a comprehensive understanding of both technical maturity and mastery of quality itself. The guarantee of quality is still very helpful.
Nowadays, the LCD panel can be divided into three grades according to the quality of ABC. Although there is no hard regulation, in general, the number of panel dead pixels is less than one grade A, and three or more are grade C, only Very few manufacturers who dare to make no-bad promises will claim to be A+ products. Therefore, consumers must personally check the quality of the products when they are shopping, especially those who claim to be A+, so as not to be deceived by illegal dealers. Go for more money.
Display ratio selection
At present, like TV, monitors have a variety of screen ratios. Screen sizes commonly found on 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. Perhaps for some users, this may be just a choice for size or monitoring habits. Actually it is not. Like the monitor device, the front-end surveillance camera also has a fixed aspect ratio during operation. If the aspect ratio of the front and rear ends is difficult to match, the displayed image will be distorted or deformed, which will have a certain impact on the monitoring effect.
Monitor board (picture source network)
At present, although the aspect ratio of the monitor is various, from the application point of view, the ratio of 16:9 is the ratio approved by most current surveillance cameras. HD network cameras like 720p*1080i basically recognize the 16:9 format. In the long run, the future of 16:9 is likely to become the mainstream proportion of surveillance cameras. When we are selecting equipment, the ratio of 16:9 should be worthy of special attention.
Investigation of imaging performance
When we introduced how to purchase surveillance cameras, we often advise consumers to make decisions based on actual conditions after actual comparisons. In fact, the same is true for monitors. However, the comparison is easy, but what aspects should we pay attention to during the actual operation and observation?
Resolution
For the choice of resolution, we also use the 16:9 screen ratio as a case. Currently, 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 number of relevant lines displayed to see if it meets the requirements of this level of quality. In addition, we can also set a high-speed moving object in the monitoring before the monitoring lens, so that you can see the reaction rate of the monitor, and whether there is a tailing phenomenon.
Reaction time
Say the corresponding time, we can look at the current level of the corresponding time. Currently, response time is getting closer and closer to become an important selling point for monitor manufacturers. In the camera work engineering, if you want to achieve the best monitoring results, no reaction speed of 60 frames / sec is difficult to achieve. And such a rate can be satisfied by the reaction speed within 16ms.
Monitor wall (picture source network)
However, you don't have to worry about it. The response time of the current mainstream monitors has basically reached the level of 8ms, which can meet the processing intensity of 125 frames per second. However, for users who are not very demanding, 12ms or 16ms products are actually enough. Especially for some conventional fixed-point low-speed dome cameras, 8ms is somewhat wasteful.
Brightness and contrast selection
When we choose a monitor, we often see a choice of brightness and contrast. And what kind of reaction is these two parameters? Generally speaking, the higher the brightness of the LCD monitor, the more vivid its color, and the actual display effect is better. For those products with lower brightness. The image it displays will also be darker, increasing the user's fatigue. At present, the brightness of an ordinary monitor is about 250 cd/m2. Over-illumination and too-darkness will affect the imaging.
Contrast is said when the brightness is finished. After all, the contrast value is derived from the brightness of the white screen divided by the brightness of the black screen. Therefore, the greater the difference between the two, the clearer the displayed picture, the stronger the feeling. Under normal circumstances, the contrast of the LCD monitor is about 3000:1, the contrast of the traditional CRT monitor will be much lower than the LCD screen. But for monitors, 400:1 is almost as fast as the contrast of the monitor. When the contrast is lower than 300:1, the monitor can be ignored.
Visual angle observation
In fact, for the viewing angle, this is a new reference direction in the field of monitors. Since the light of the liquid crystal monitor is vertically emitted through the liquid crystal at a nearly vertical angle, the color of the screen and the like may vary greatly when the screen is viewed at different angles. And such problems will not be encountered when the traditional CRT monitor.
Large screen LCD monitor (picture source network)
In the observation, the viewing angle can be divided into a horizontal angle and a 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.
Monitor stability
In fact, when it comes to stability, I am afraid that everyone will feel that this is the most relevant thing for everyone, but it is also one of the most helpless places. If stability is "looking out" out of thin air, then this is indeed a bit exaggerated. However, on the surface, there are indeed a few small places that can help to extend the life of our equipment more or less, for example, the dead point of the monitor mentioned at the beginning of the article, or whether there is anti-jamming function. The case, good cooling, advanced cooling fan and temperature control mode, and more. In addition, the application technology of the screen can also be used as an object of understanding.
The above is the main point of attention when choosing a liquid crystal monitor. In fact, according to different needs, the focus of the monitor when purchasing is also very large. Here are just some of the more important information for everyone to point out. I hope that everyone can buy a suitable monitoring device for themselves on the basis of understanding. Since this is a monitor, then let it show a stronger domineer than TV. You said yes?
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