Liquid crystal display and LCD splicing common problem solving
In recent years, the monitoring front-end display technology has gradually attracted users' attention with its advantages of high definition, wide viewing angle, high brightness, and long lifespan, but some frequent problems have slowly surfaced.
Liquid crystal display common problems to solve
When a monitor is used as a monitor terminal of a matrix control system, why is there a period of non-synchronization when the matrix controller switches images?
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 sometimes there are image distortions, distortions, inconsistent lines and fields, and even no input signal failures or phenomena?
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 that the ground-to-ground resistance of the front and rear ends is <1Ω. The grounding line must not form a closed loop, and must not be short-circuited or mixed with the strong grid neutral line.
Frequently Asked Questions on Mosaic Screens to Solve the Aging Problem
LCD splicing screens can easily overheat certain pixels due to prolonged work. Once it exceeds the limit, it will lead to permanent damage, and this leads to the so-called "bad point." Because the pixels of a liquid crystal splicing screen are composed of liquid crystals, when they are continuously operated at full load for more than 96 hours, they will accelerate to aging, and even burn out in severe cases. Therefore, if the user must work for a long time, it is best to intermittently allow him to rest for a while, or often to change the screen appearance at different time intervals, because it is necessary to reduce the brightness while waiting for work, or it is in the screen saver mode. The next operation for a while, this effort can not only delay the aging of the LCD screen, but also to avoid hardware damage.
In addition, LCD no matter what the problem is, it is forbidden to self-assemble LCD splicing screen (especially for those who are interested in general DIY is even more), once the LCD splicing screen is not working properly, you can find a vendor to help solve. Since the transformer in the LCD backlighting assembly may still have a high voltage of 1000 V (albeit a micro-current) after being turned off for a certain period of time, non-professionals may cause new failures of the assembly if not handled properly.
Moreover, the LCD display screen is very fragile and delicate, and its impact resistance is poor. This is because the LCD contains many precision glass components and agile electrical components that can cause damage to the LCD screen and other related components in the event of a strong impact. So be sure to avoid strong shocks. At the same time, we must pay attention not to exert pressure on the surface of the LCD screen, such as pointing a certain part of the screen with a finger, which can easily cause an increase in the number of dead pixels.
In addition, if you find dirt on the surface of the LCD panel, you should use an accurate method to remove the dirt. The media used is preferably a soft, non-fibrous material, such as absorbent cotton, lens paper, or a soft cloth, and then wiped off with a little glass cleaner, prohibit the use of chemical solutions such as alcohol, can not use rough Cloth or paper items, because these materials are prone to scratches. Here we must remind everyone that do not directly spray the cleaning system to the surface of the screen, it is very easy to flow to the screen inside the LCD screen resulting in short-circuit failure, causing unnecessary losses.
Splicing Screen Flower Screen Problem
A: Check whether the connection between the LCD splicing screen and the graphics card is loose. Poor contact can cause "clutter" or "noise"-like flower screens to be the most common phenomenon.
Second: Check if the video card is over-clocked. If the video card is over-used excessively, irregular and intermittent stripes will appear. At this time, the frequency of overclocking should be appropriately reduced. Note that we must first reduce the memory frequency.
Three: Check the quality of the video card. If the video card appears after the replacement of the video card, and after the first and second strokes fail to work, check whether the anti-electromagnetic interference (EMI) and the quality of the electromagnetic shielding of the video card are over. The specific method is: Place some components that may produce electromagnetic interference away from the video card installation (such as hard disk) as far as possible, and then see if the video screen disappears. If it is determined that the electromagnetic shielding function of the graphics card is off, the graphics card or the self-made shielding cover should be replaced.
Four: Check whether the resolution or refresh rate of the LCD splicing screen is set too high. The resolution of the LCD splicing screen is generally lower than that of the CRT monitor. If the resolution exceeds the best resolution recommended by the manufacturer, there may be a phenomenon of a flowering screen.
Five: Check if an incompatible graphics card driver is installed. This kind of situation is generally easy to overlook, because the graphics card driver is updated faster and faster (especially NVIDIA graphics cards), and some users can't wait to install the latest version of the driver. In fact, some of the latest drivers are either test versions or versions that are optimized for a particular graphics card or game. Using such drivers can sometimes lead to the appearance of flower screens. Therefore, it is recommended that you use Microsoft-certified drivers as much as possible. It is best to use drivers provided by the graphics card manufacturers.
Six: If you can't solve the problem after using the above five strokes, you may have problems with the quality of the LCD splicing screen. At this point, replace the other monitor for testing.
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