Monitor purchase: LCD panel is very important
LCD monitor, also known as LCD monitor. Mentioned that the history of the development of LCD monitors can be traced back to the 19th century. At the end of the 19th century Austrian botanists discovered liquid crystals, that is, liquid crystals. Until the 1960s, the first LCD monitor was born. Then, starting in 1998, liquid crystal display technology entered the application area of desktop displays. This great discovery has finally produced enormous value in commercial applications. There is also an LCD monitor that is currently widely used.
LCD monitor 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 the quality of its own, 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 are no rigid rules, but usually, the number of panel bad points is within one A level, and more than three is the C level, only Very few manufacturers who dare to make promises without bad will call themselves A+ products. Therefore, when shopping, consumers must personally and meticulously check the picture quality of the products, especially those products that claim to be A+, so as to avoid being tricked 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 will be distorted or deformed, which will have a certain impact on 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 proportion 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, after making actual comparisons, make decisions based on actual conditions. 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 parameter resolution for imaging parameters
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 input sharpness test signal, and then observe the displayed number of relevant lines to observe whether the quality of this level meets the needs. 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 phenomenon of tailing 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, an ordinary monitor has a brightness of 250 cd/s, and too bright and too dark affects 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 is less 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, the larger surveillance 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 relevant, 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 more or less help to extend the useful life of our equipment. 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.
The maintenance of the monitor
Then what needs to be paid attention to during the use of LCD monitor products, how to maintain and maintain it? Today, Projection Times Net will come to you briefly.
The first thing to do is to avoid the monitor colliding or rubbing against some hard objects. Because the monitor product is fragile, its ability to resist "impact" is also very small, many crystals and sensitive electrical components will be damaged in the event of an impact, so always be careful not to let the monitor have access to those pairs It is easy to cause damage to the object.
In addition, you should always pay attention when cleaning the screen. Do not spray the cleaner directly onto the screen, because these liquids may flow into the screen and cause a short circuit and affect the use. The cleaner should be sprayed onto a clean soft cloth, and then wipe the screen to avoid danger.
Second, if you inadvertently spray cleaner onto the screen, you don't have to worry too much when the cleaner fluid fills the screen. If it is found before the boot just a screen surface mist, gently wipe with a soft cloth on it, if the water has entered the LCD monitor, then put the LCD monitor at a slightly higher temperature, for example, under the lamp , gradually evaporate the water inside.
However, if the situation of “overwhelming” on the screen is more serious, the user still calls a professional maintenance personnel to ask for their help. Because the more serious moisture will damage the components lead to permanent damage to the liquid crystal electrode corrosion. Therefore, when you do not allow liquids or water to flow into the monitor screen, you should try to use the monitor product in a dry and ventilated environment to avoid unnecessary trouble.
Third, it is best not to use a screen saver. why? Then look down and you will know. Because the core structure of the LCD monitor is similar to "sandwich", it is a liquid crystal molecule in which two glass substrates are filled with motion. The signal voltage directly controls the switching state of the thin film crystal, and the transistor is used to control the liquid crystal molecules. The liquid crystal molecules have obvious optics. Anisotropic, able to modulate the light emitted from the backlight to achieve image display. A complete display consists of many pixels, each of which looks like a switchable transistor.
A liquid crystal monitor that is displaying an image has its liquid crystal molecules switched on and off. For a monitor with a response time of 20ms, the liquid crystal molecules have been turned on and off for several hundred times in one second. The number of switching times of the liquid crystal molecule, that is, its service life, is limited. After using a certain program, there will be aging, affecting the use of results.
When the computer stops operating, the screen saver that displays colorful and repetitive movements on the screen allows the liquid crystal molecules to remain in the repeated switching state. This will not shorten the useful life of the monitor.
Therefore, when the computer is not used for a short period of time, the computer can be put into a standby state. This means that environmental protection and energy saving can also extend the service life of the monitor. What can you do for it?
Finally, I would like to tell everyone that if there is a problem with the LCD monitor product, do not dismantle the product without permission. Because the monitor generates high voltage inside, it is not only dangerous for people who do not know to disassemble the monitor. It is also easy to increase the monitor's failure. Therefore, when problems occur, you must promptly call a professional service agency to avoid unnecessary trouble.
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