What Is a Multisync Monitor?

A liquid crystal monitor, or liquid crystal display (LCD), is a flat and ultra-thin display device. It consists of a certain number of color or black and white pixels and is placed in front of a light source or reflective surface. LCD monitors have very low power consumption, so they are popular with engineers and are suitable for battery-powered electronic devices. Its main principle is to use a current to stimulate the liquid crystal molecules to generate dots, lines, and surfaces in cooperation with the back light tube to form a picture.

LCD monitor

A liquid crystal monitor, or liquid crystal display (LCD), is a flat and ultra-thin display device. It consists of a certain number of color or black and white pixels and is placed in front of a light source or reflective surface. LCD monitors have very low power consumption, so they are popular with engineers and are suitable for battery-powered electronic devices. Its main principle is to use a current to stimulate the liquid crystal molecules to generate dots, lines, and surfaces in cooperation with the back light tube to form a picture.

Chinese name

LCD monitor

Foreign name

Liquid Crystal Display [LCD]

Application range

Surveillance, government, shopping mall

Attribution

The first brand category of industrial HD display

Column

Economical LED monitor, all aluminum monitor

The monitor is part of a closed circuit monitoring system (cctv)

The difference between a monitor, a television, and a display is mainly reflected in three degrees in terms of performance, namely:

About the particularity and professionalism of monitor use, choose

The monitors are well-known domestic brands, with strong manufacturers and complete products: Beijing Xinkehua (new picture),

By size

LCD monitor is divided into: 3.5 inch LCD monitor / 5.6 inch LCD monitor / 8 inch LCD monitor / 10.4 inch LCD monitor / 12 inch LCD monitor / 15 inch LCD monitor / 17 inch LCD monitor / 19 inch LCD monitor / 20 inch LCD monitor / 22 inch LCD monitor / 24 inch LCD monitor / 26 inch LCD monitor / 32 inch LCD monitor / 37 inch LCD monitor / 40 inch LCD monitor / 42 inch LCD monitor / 46 inch LCD monitor / 47 inch LCD monitor / 52 inch LCD monitor / 55 inch LCD monitor / 65 inch LCD monitor / 70 inch LCD monitor / 82 inch LCD monitor etc./84 inch LCD monitor / 84 inch LCD monitor, 110 inch LCD monitor.

By color

Color, black and white monitor. CRT monitors are classified according to scanning methods: interlaced, progressive scanning, etc., while LCD monitors are not distinguished according to scanning methods.

By brand

skyworth LCD monitor,

Difference from CRT monitor

It should be said that traditional CRT monitors have advantages over existing LCDs in terms of brightness, contrast, and viewing angle, but with the advancement of LCD technology, their brightness and contrast have increased to a level comparable to CRT. In terms of viewing angle, the existing LCD screen is close to absolute viewing angle, and there is no gap compared with CRT. LCD monitors have advantages over CRT monitors in terms of lightness, thinness, environmental protection, and low power consumption. In addition, LCD monitors can eliminate many problems of CRT monitors, which are mainly manifested in five aspects:

A. The LCD monitor completely eliminates the problem of burns, that is, the long-term static and bright picture attenuates the fluorescence of the CRT monitor, resulting in the phenomenon of ghosting. The LCD panel used in LCD monitors does not emit light by itself, and there is no fluorescent substance or electron beam. Therefore, whether it is a static or dynamic picture, it is the same for the liquid crystal, and no burns will occur.

B. The LCD monitor will not flicker at all . With CRT monitors, due to the problems of frame rate and interlaced blanking, when the screen is scanned, it will cause flicker and cause fatigue of the user's eyes. Liquid crystal is passively emitted. Its light source is filtered by a light filter and the reflector is quite soft. The angle deflection of the liquid crystal crystal is displayed frame by frame in units of one point. Therefore, the liquid crystal itself does not have any flicker.

C, LCD monitor has no aggregation phenomenon. The CRT monitor uses an electron beam. Due to the different horizontal and vertical angles when R, G, and B reach the screen surface, the convergence error of R, G, and B may be caused. The centering effect of the center and the four corners is different. It is more accurate and the corners are slightly off. However, since LCD is displayed point by point, there is no problem of poor aggregation or poor convergence.

D. There is no magnetism in the LCD monitor, and there is no need to eliminate it.

E. The LCD monitor uses fixed pixels and does not cause geometric distortion.

Difference from LCD TV

Image Processing

TV sets usually watch fast-moving moving pictures and have poor image processing capabilities for still pictures. Most monitors monitor still pictures, so monitors are more professional in image processing. Professional LCD monitors have bandwidth compensation Improve the circuit, the video bandwidth reaches 20M, which greatly improves the definition. Professional 3D digital comb filter, enhances the brightness and chroma digital noise reduction processing capabilities, enhances the motion detection capability, significantly improves the smoothness of the edges of moving images, greatly improves With the layered sense of the picture, it can better express the details and make the picture more delicate and natural.

Color reproduction

If the definition is mainly determined by the amplitude-frequency characteristics of the video channel, the degree of reduction is mainly determined by the phase of the chrominance and luminance signals of the three primary colors of red (R), green (G), and blue (B) in the monitor. Decided. Because monitors usually observe static images, the requirements for monitor color reproduction are higher than for televisions, so professional LCD monitors should have accurate compensation for brightness, chroma processing, and R, G, and B processing. Circuit and delay circuit to ensure that the phase of the bright / color signal and R, G, B signal are synchronized.

Machine stability

When a monitor constitutes a closed-circuit monitoring system, it usually requires 24 hours a day, 365 days a year without interruption. (The TV usually works only a few hours a day), and the application environment of some monitors may be harsh. Requires higher reliability and stability of the monitor. Compared with televisions, in terms of design, the current, power consumption, temperature, and resistance to electrical interference, the ability and margin of electrical shock, and the average trouble-free time of the monitor are much larger than those of the television. At the same time, the monitor must also Use a fully shielded metal case to ensure electromagnetic compatibility and interference performance; in the selection of components, the components used in the monitor have higher voltage, current, temperature, humidity and other characteristics than those used in televisions; In terms of the process requirements for installation and commissioning, especially the aging of components and the entire machine, the requirements of the monitor are also higher. When the television is manufactured, the whole machine is usually energized at normal temperature on the assembly line for about 8 hours. For aging, it is necessary to apply aging on the aging line in a high-temperature, high-humidity closed environment for more than 24 hours to ensure the stability of the whole machine. The components used in the TV are not suitable for the requirements of continuous use without interruption. If the TV is forced to be used as a monitor, it is easy to cause malfunctions. In serious cases, it may cause accidents due to the TV's high temperature.

The principle of intelligent afterburning

The digital image processing chip's intelligent afterburning function will continuously monitor the input signal, and determine whether the image is a still image or a dynamic image according to the root mean square value of each frame of the input signal. The root mean square value reflects The average brightness level and light-dark distribution of the input image. From this parameter we can determine the characteristics and differences of each frame of the input signal. If the input image is a still image for a period of time, the system starts the afterburning engine. The engine will automatically move the format of the input signal according to the stillness or activity of the input image, so that the position of the input image on the screen changes slightly and quickly, eliminating the long-term, unchanged control of the liquid crystal molecules, and This long, static control voltage on the liquid crystal molecules is exactly the root cause of the afterimages that occur after the LCD screen plays a still image for a long time. After the afterimage engine's fast and small transformation of the input still image, the liquid crystal molecules get a chance to breathe for a certain period of time, thereby avoiding permanent damage to the LCD screen and achieving the purpose of eliminating afterimages

The difference between LCD monitor and LCD monitor

The panel of an LCD monitor is different from the panel of an LCD monitor. The panel used to make an LCD monitor has much higher technical parameters than the panel of an LCD monitor, so a good LCD monitor is better than an LCD monitor. The price is higher.

The working hours of LCD monitors and LCD monitors are different. LCD monitors can work 24 hours a day, 365 days a day, while LCD monitors can only work continuously for a few to ten hours, and cannot be used as LCD monitors.

LCD monitor and LED monitor

True color LED display: Light-emitting diode

Note: The unidirectional conductivity of the diode is used to control the color and gray scale of the electronic circuit to realize graphic, video and video display.

Advantages: 1. High brightness, is an active light-emitting device, is not affected by the environment, has a long service life, and individual pixel damage can be maintained without affecting the overall situation.

2. Bright colors and wide viewing angle. No splicing image loss, can be used as a large screen of several square meters. ...

Disadvantages: The dot density is not high and it is not suitable for close viewing.

The LCD monitor is also suitable for close viewing, with high resolution, which can be used for monitoring or product display, large shopping malls, water conservancy scheduling, etc.

The LCD display is a civilian display

First of all: LCD monitors use civilian display screens, LCD monitors use bright industrial screens, and domestic TV screens are generally used;

Second: The driving scheme is different. The LCD monitor can be used for a long time, and the brightness, contrast, and sharpness are much higher. If the ordinary LCD monitor is used for a long time, the brightness and contrast will decrease quickly, affecting the service life.

Second: The LCD monitor focuses on dynamic signals. The viewing angle of the LCD monitor can reach 178 degrees, and ordinary LCD monitors can only see a white color at 178 degrees.

In addition, there are many so-called LCD monitors on the market. In fact, all of them are modified monitors. 19 "inches below 1K are like changing the shell, and they are likely to be old screens. Buy carefully.

Save electricity

For example, there are tens of thousands of street lights in China. The remote power controller IP POWER 9258 can be used to remotely control the timed on, off, or delayed on or off of each light through the network (to prevent the current from being turned on too much at the same time). The impact); the system can also adjust the brightness of the light, which can save considerable power.

Lightning protection of equipment

For example, radio and television equipment is concerned about lightning strikes in the summer. Equipment in the radio and television industry has relatively high sensitivity and high value, and sometimes it is not just a problem of lightning protection. When there is a lot of lightning, related equipment must be turned off, and lightning protection facilities and surge protection equipment cannot be solved. At this time, the power of related equipment must be turned off. With Zhongtianda's remote power controller IP POWER 9258, you don't need to visit the site to solve all this. When the lightning stops, you can turn on all the equipment through the network, saving manpower and material resources, and preventing the risk of lightning strikes.

Network device freezes

When ordinary routers, switches, cameras, etc. are used for a long time, it is prone to crashes and other failures. Zhongtianda remote power controller IP POWER 9258M has intelligent detection function: When the network is normal, the remote power controller cannot communicate with network equipment such as a switch router. When this communication is continuously interrupted for a certain time or number of times, determine whether the device is If the network device is dead, the remote power controller will disconnect the power of the network device, and then turn on the device power within a certain period of time to achieve the purpose of restarting the device, because most devices can be achieved after restarting normal work.

Computer crash

What if my electrical equipment is a computer? Don't worry. Our remote power controller provides remote wake-up function, as long as you enter the computer's MAC address, it can be achieved. Of course, your computer motherboard must support remote wake-up!

With the development of technology, the current remote power controller also adds environmental monitoring functions, which can integrate remote video monitoring, remote sensor control (including temperature sensor control, concentration sensor control, motor speed control, light brightness sensor control, glass breakage) Induction monitoring) current and voltage monitoring and control, and also adds remote alarm function to achieve remote management of unattended computer room or home!

From a long time to come, it is an inevitable trend for LCD liquid crystal monitors to replace CRT picture tube monitors. In the construction of security projects, LCD liquid crystal monitors will gradually become mainstream products, and the market share of CRT monitors will gradually shrink. . In this context, the market for LCD monitors is heating up.

First of all, everyone knows that LCD monitors, LCD TVs, and LCD monitors are the same in principle. The difference is that their raw materials and some modules are different. Therefore, the technologies of these products are affecting each other's development. Every time the progress of display technology promotes the common progress of these several products.

First, avoid collision or friction between the monitor and some hard objects. Because the monitor product is relatively fragile, its ability to resist "impact" is also very small. Many crystals and sensitive electrical components will be damaged when subjected to impact. Therefore, you must be careful not to allow the monitor to have access to those objects. It is easy to cause harm to objects.

In addition, you should also pay attention when cleaning the screen, do not spray the cleaner directly on the screen, because these liquids may flow into the screen and cause a short circuit, which will affect the use. Instead, spray the cleaner on a soft, clean cloth, and then wipe the screen to avoid danger.

Secondly, if you accidentally spray the cleaner onto the screen, you don't have to worry too much when the cleaner liquid is injected into the screen. If it is found that there is only fog on the screen surface before starting up, wipe it gently with a soft cloth. If moisture has entered the LCD monitor, then place the LCD monitor at a slightly higher temperature, such as under a lamp , Gradually evaporate the water inside.

However, if the screen is "flooded", it is more appropriate for users to call professional maintenance personnel to ask for their help. Because more severe moisture will damage the components and cause permanent damage to the liquid crystal electrode corrosion. Therefore, when avoiding liquid or water flowing into the monitor screen, try to put the monitor product in a dry and ventilated environment to avoid unnecessary trouble.

Third, it's best not to use a screen saver. why? Then look down and you will know. Because the core structure of an LCD monitor is similar to a "sandwich", it is filled with moving liquid crystal molecules between two glass substrates. The signal voltage directly controls the on-off state of the thin-film crystal, and the transistor is used to control the liquid crystal molecules. The liquid crystal molecules have obvious optics. Anisotropy, which can modulate the light emitted from the backlight tube to achieve image display. A complete display consists of many pixels, each of which looks like a transistor that can be switched on and off.

For a liquid crystal monitor that is displaying images, the liquid crystal molecules are always on and off. For a monitor with a response time of 20ms, the liquid crystal molecules have been switched on and off hundreds of times in one second. , And the number of switching of liquid crystal molecules, that is, its service life is limited. After using a certain program, aging phenomenon will occur, affecting the use effect.

And when the computer stops operating, the screen saver program with colorful and repetitive motion is displayed on the screen to keep the liquid crystal molecules on and off repeatedly. This will shorten the life of the monitor.

When the monitor is used as the monitor terminal of the matrix control system, why does the matrix controller switch out of synchronization for a period of time?

In the monitoring system, if there is a phase difference between the field synchronization signals in the image signals output by each front-end device (such as a camera), the monitor will be out of synchronization for a period of time when the matrix controller switches the image signals. The larger the phase difference is, the longer the unsynchronized time is. Therefore, it is recommended that when constructing a monitoring system, front-end equipment with external synchronization (GEN-LOOK) input should be selected as much as possible, and all front-end equipment use external synchronization, that is, the synchronization of each image signal is controlled by the same synchronization signal. Causes the monitor screens to be synchronized.

When observing an image with a monitor, why does it sometimes appear that the image is distorted, distorted, out-of-synchronized, or even has no input signal?

1. The industry standard of the monitor stipulates that the input signal amplitude of a professional monitor is 1Vp-P ± 3dB (about 0.7Vp-P1.4Vp-p), and the input impedance is 75 ohms. Therefore, if the input signal is due to cable attenuation, impedance mismatch, or non-standard BNC head of the transmission cable, the input signal amplitude is much lower than 0.7pp; or because the output of the camera is not standardized or some irregularities are connected When the access equipment (such as distributors, amplifiers, etc.) causes the input signal amplitude to be much larger than 1.4Vp-p, it may cause image distortion and out-of-synchronization.

2. Because the video frequency range is wide, the video signal is more susceptible to interference during transmission (including 50Hz power supply interference, electromagnetic wave interference, etc.), which affects the image quality. Severe interference may cause image distortion, distortion, track and field out of sync. Therefore, during the installation of the monitoring system, the video cable must be kept away from the source of electromagnetic interference.

3. There is a potential difference between the potentials of the front-end equipment, the control host equipment, and the terminal equipment, which will also interfere with the video signal, causing distortion of the image signal or the appearance of a raceway. If the entire system is powered on (ie, the front-end equipment, main control When the device and terminal device are connected to the BNC head and connected to the front-end and back-end devices while the power is on, the ground may jump to ground due to the potential difference between the ground wires of the front-end and back-end devices (actually the shield layer of the transmission cable) Fire, when this flashover is severe, it will destroy the input terminal components or the ground-level wiring in the casserole of the PCB board. As a result, the input is open, and there is no image failure on the input. Therefore, the construction of the monitoring system project should be designed and constructed strictly in accordance with specifications. The grounding bus should use copper conductors with sufficient cross-sections to ensure that the ground-to-ground resistance at the front and rear ends is less than 1. The grounding wire must not form a closed loop and should not be short-circuited or mixed with the strong grid zero line.