Ya Xunda: LCD Monitor Selection Guide
2020-03-25 15:13:21
HD and smart are the future development direction of the entire video surveillance system. For the rear-end display devices, the technology development trend of LCD monitors is: low power consumption, environmental protection and energy saving, ultra-thin, high contrast, multi-functionality, low cost, and no flicker. Full HD display, smooth screen, wide viewing angle.
It is expected that the LCD monitor will occupy more than 90% of the entire video surveillance display market in the next three years. Ultra-narrow edge display will continue to be the most popular product in the large-screen splicing market. With the promotion of ultra-narrow edge displays, the market demand for large-screen splicing display devices will continue to expand. It is expected that the ultra-narrow edge LCD splicing market will be compounded in the next five years. The growth rate will remain at around 24%.
Different users have different needs. In the current high-definition video display devices, whether it is LCD, LED or HD-SDI, whether it is LCD splicing, DLP splicing, or PDP splicing, there is a clear distinction between the market, the price is also obvious segmentation. Because of their irreplaceable advantages, they will co-exist in the market for a certain period of time.
Raiders optional ratio selecting LCD monitor <br> <br> a display of
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.
Second, imaging performance inspection
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 factor 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 said the corresponding 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.
Third, the choice of brightness and contrast
When we select the monitor, we often see a choice of brightness and contrast. What is the reaction of these two parameters? In general, the higher the brightness of the LCD monitor, the brighter its color will be, and the actual display effect will be better. 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.
Fourth, monitor the stability of the investigation
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.
Fifth, the observation of the 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.
VI. Inspection of 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.
It is expected that the LCD monitor will occupy more than 90% of the entire video surveillance display market in the next three years. Ultra-narrow edge display will continue to be the most popular product in the large-screen splicing market. With the promotion of ultra-narrow edge displays, the market demand for large-screen splicing display devices will continue to expand. It is expected that the ultra-narrow edge LCD splicing market will be compounded in the next five years. The growth rate will remain at around 24%.
Different users have different needs. In the current high-definition video display devices, whether it is LCD, LED or HD-SDI, whether it is LCD splicing, DLP splicing, or PDP splicing, there is a clear distinction between the market, the price is also obvious segmentation. Because of their irreplaceable advantages, they will co-exist in the market for a certain period of time.
Raiders optional ratio selecting LCD monitor <br> <br> a display of
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.
Second, imaging performance inspection
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 factor 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 said the corresponding 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.
Third, the choice of brightness and contrast
When we select the monitor, we often see a choice of brightness and contrast. What is the reaction of these two parameters? In general, the higher the brightness of the LCD monitor, the brighter its color will be, and the actual display effect will be better. 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.
Fourth, monitor the stability of the investigation
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.
Fifth, the observation of the 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.
VI. Inspection of 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.
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