With the wide application of video surveillance, people not only pursue the display effect of terminal monitoring equipment, but also pay more and more attention to the non-radioactive, flicker-free, environmental protection, energy saving and other indicators of the monitoring equipment.
Monitor monitor eye protection method
Then after changing the monitor from CRT to LCD, the eyes are more fatigued than before. What is a good way?
Try to adjust the brightness and contrast of the monitor, change the background color and see how it works. If you have to face the LCD monitor for a long time every day, you may want to install the protection screen. Look at the computer monitor to see eyestrain, I'm afraid this experience I have encountered. This state of continuation will lead to eye strain, blurred vision, shoulder acid, headache, systemic fatigue, and vision loss.
Causes of eye fatigue include: light and reflected light mapped to the monitor, flickering of the screen, etc.
Compared with the CRT, the LCD monitor basically does not suffer from flickering problems. In contrast, mapping light and reflected light have become problems for LCD monitors. When a fluorescent lamp or a person's face is mapped onto a screen, the difficulty of reading the screen is increased, and the eye muscle activity exceeds the normal level. It can be said that it is this reason that causes eye fatigue. In addition, liquid crystal monitors have recently developed to high brightness and high contrast. Although this is good for color display, it also makes the eyes more prone to fatigue. Therefore, try to avoid eye strain when working with the LCD monitor.
Adjust picture brightness, contrast and color
Adjust the screen contrast and brightness. However, if normal surveillance work is performed for a long period of time, proper reduction in contrast and brightness can reduce eye strain. The LCD monitor has functions such as adjustment of brightness and contrast, vertical and horizontal deviation and tilt. Try using these features to adjust brightness and contrast. However, when the brightness and contrast are too low, eye fatigue is more likely to occur. Therefore, try several times to adjust to your own condition. As for the adjustment method, please refer to the instructions of each monitor.
In addition, through the Windows screen settings, you can also change the window's color configuration. Select [Display] on the control panel, click [Appearance], and then click [Detail Settings], and you will be able to change to your favorite color configuration. In the initial setup, because the white of the window background is too strong, changing it to cream or light green will have a nice effect. Please select [Window] in [Advanced] and use [Color 1] to change to the favorite color.
Depending on the software, the window color may not change even if the above changes are made. In the menu of this type of software, there is a separate window background setting instruction. Please confirm it with help.
Install screen on screen
To avoid eye strain by reducing screen reflections and mapping, the most effective way is to install the protection screen on the screen. Transmittance refers to the ratio of light passing through the protective screen. The smaller this value, the thicker the color of the protection screen. When dealing with pictures and photos, it is necessary to be as close to natural colors as possible. Therefore, products with a high transmittance value (about 80 to 90%) should be selected. The person who feels that the screen is dazzling usually prefers a product with a lower transmission rate (50 to 70%).
Liquid crystal display often solve problems
In recent years, LCD has attracted users' attention with its high-definition, wide viewing angle, high brightness, and long lifespan. However, some common problems have gradually surfaced. When a monitor is used as a monitor terminal of a matrix control system, why is it that the matrix controller switches the image for a period of time when there is no synchronization?
In the monitoring system, if there is a phase difference between the field sync signals in the image signals output from each front-end device (such as a camera), the monitor will display a period of non-synchronization when the matrix controller switches the image signals of each channel. The larger the phase difference, the longer the time that is not synchronized. Therefore, it is recommended that when constructing a monitoring system, front-end devices with GEN-LOOK input should be used as much as possible, and all front-end devices should use external synchronization. That is, the synchronization of each image signal is controlled by the same synchronization signal. Causes the monitor screen to show sync.
When using the monitor to observe the image, why does the image distortion, distortion, line and field synchronization, or even failure of the input signal occur?
1. The monitor's industry standard specifies that the input amplitude of the professional monitor is 1Vp-P±3dB (about 0.7Vp-P-1.4Vp-p), and the input impedance is 75 ohms. Therefore, if the input signal is not standardized due to cable attenuation, impedance mismatch, or the BNC head of the transmission cable, the input signal amplitude is much lower than 0.7 pp; either the camera output is not regulated or some irregularity is connected. When the input signal (such as distributor, amplifier, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion, line and field synchronization, etc.
2. Due to the wide video frequency range, video signals are more susceptible to interference during transmission (including 50Hz power interference, electromagnetic interference, etc.), thus affecting image quality. Severe disturbances may cause images to be distorted, deformed, raceways, and lines and fields to be out of sync. Therefore, during the installation of the monitoring system, the video line must be far away from sources of electromagnetic interference.
3. The potential difference between the front-end device, the control host device and the terminal device may also interfere with the video signal, resulting in distortion of the image signal or image appearance of a race track, if the whole system is powered on (ie, the front-end device, the master When the equipment and terminal equipment are connected to the BNC head to connect the front and rear equipment when they are powered on, it may be caused by the potential difference between the ground wire of the front and rear equipment (actually the shielding layer of the transmission cable). Fire, this severe flash fire will destroy the components at the input or the ground line in the PCB board casserole. Causes the input to open circuit and input no image fault. Therefore, the construction of monitoring system engineering should be designed and constructed in strict accordance with the specifications. The grounding bus should use copper conductors with sufficient cross-sectional area to ensure ground-to-ground resistance at the front and rear ends.
Monitor monitor eye protection method
Then after changing the monitor from CRT to LCD, the eyes are more fatigued than before. What is a good way?
Try to adjust the brightness and contrast of the monitor, change the background color and see how it works. If you have to face the LCD monitor for a long time every day, you may want to install the protection screen. Look at the computer monitor to see eyestrain, I'm afraid this experience I have encountered. This state of continuation will lead to eye strain, blurred vision, shoulder acid, headache, systemic fatigue, and vision loss.
Causes of eye fatigue include: light and reflected light mapped to the monitor, flickering of the screen, etc.
Compared with the CRT, the LCD monitor basically does not suffer from flickering problems. In contrast, mapping light and reflected light have become problems for LCD monitors. When a fluorescent lamp or a person's face is mapped onto a screen, the difficulty of reading the screen is increased, and the eye muscle activity exceeds the normal level. It can be said that it is this reason that causes eye fatigue. In addition, liquid crystal monitors have recently developed to high brightness and high contrast. Although this is good for color display, it also makes the eyes more prone to fatigue. Therefore, try to avoid eye strain when working with the LCD monitor.
Adjust picture brightness, contrast and color
Adjust the screen contrast and brightness. However, if normal surveillance work is performed for a long period of time, proper reduction in contrast and brightness can reduce eye strain. The LCD monitor has functions such as adjustment of brightness and contrast, vertical and horizontal deviation and tilt. Try using these features to adjust brightness and contrast. However, when the brightness and contrast are too low, eye fatigue is more likely to occur. Therefore, try several times to adjust to your own condition. As for the adjustment method, please refer to the instructions of each monitor.
In addition, through the Windows screen settings, you can also change the window's color configuration. Select [Display] on the control panel, click [Appearance], and then click [Detail Settings], and you will be able to change to your favorite color configuration. In the initial setup, because the white of the window background is too strong, changing it to cream or light green will have a nice effect. Please select [Window] in [Advanced] and use [Color 1] to change to the favorite color.
Depending on the software, the window color may not change even if the above changes are made. In the menu of this type of software, there is a separate window background setting instruction. Please confirm it with help.
Install screen on screen
To avoid eye strain by reducing screen reflections and mapping, the most effective way is to install the protection screen on the screen. Transmittance refers to the ratio of light passing through the protective screen. The smaller this value, the thicker the color of the protection screen. When dealing with pictures and photos, it is necessary to be as close to natural colors as possible. Therefore, products with a high transmittance value (about 80 to 90%) should be selected. The person who feels that the screen is dazzling usually prefers a product with a lower transmission rate (50 to 70%).
Liquid crystal display often solve problems
In recent years, LCD has attracted users' attention with its high-definition, wide viewing angle, high brightness, and long lifespan. However, some common problems have gradually surfaced. When a monitor is used as a monitor terminal of a matrix control system, why is it that the matrix controller switches the image for a period of time when there is no synchronization?
In the monitoring system, if there is a phase difference between the field sync signals in the image signals output from each front-end device (such as a camera), the monitor will display a period of non-synchronization when the matrix controller switches the image signals of each channel. The larger the phase difference, the longer the time that is not synchronized. Therefore, it is recommended that when constructing a monitoring system, front-end devices with GEN-LOOK input should be used as much as possible, and all front-end devices should use external synchronization. That is, the synchronization of each image signal is controlled by the same synchronization signal. Causes the monitor screen to show sync.
When using the monitor to observe the image, why does the image distortion, distortion, line and field synchronization, or even failure of the input signal occur?
1. The monitor's industry standard specifies that the input amplitude of the professional monitor is 1Vp-P±3dB (about 0.7Vp-P-1.4Vp-p), and the input impedance is 75 ohms. Therefore, if the input signal is not standardized due to cable attenuation, impedance mismatch, or the BNC head of the transmission cable, the input signal amplitude is much lower than 0.7 pp; either the camera output is not regulated or some irregularity is connected. When the input signal (such as distributor, amplifier, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion, line and field synchronization, etc.
2. Due to the wide video frequency range, video signals are more susceptible to interference during transmission (including 50Hz power interference, electromagnetic interference, etc.), thus affecting image quality. Severe disturbances may cause images to be distorted, deformed, raceways, and lines and fields to be out of sync. Therefore, during the installation of the monitoring system, the video line must be far away from sources of electromagnetic interference.
3. The potential difference between the front-end device, the control host device and the terminal device may also interfere with the video signal, resulting in distortion of the image signal or image appearance of a race track, if the whole system is powered on (ie, the front-end device, the master When the equipment and terminal equipment are connected to the BNC head to connect the front and rear equipment when they are powered on, it may be caused by the potential difference between the ground wire of the front and rear equipment (actually the shielding layer of the transmission cable). Fire, this severe flash fire will destroy the components at the input or the ground line in the PCB board casserole. Causes the input to open circuit and input no image fault. Therefore, the construction of monitoring system engineering should be designed and constructed in strict accordance with the specifications. The grounding bus should use copper conductors with sufficient cross-sectional area to ensure ground-to-ground resistance at the front and rear ends.
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