What are the advantages and disadvantages of LCD monitors and traditional monitors?

Traditional CRT monitors have been developed for decades, and their technical and structural principles have limited their further development. Vacuum cathode ray tube inherent several major shortcomings lead to CRT monitors more and more difficult to adapt to the further improvement of consumer requirements for the display, at this time, flat-panel display devices to rise, which is most likely to replace the CRT monitors in the PC display terminal monopoly is the status of the liquid crystal display.

Liquid crystal displays are very different from CRT monitors. Relative to CRT monitors, LCD monitors are born with the following absolute advantages:

1, zero radiation, low energy consumption, heat dissipation. LCD display principle is by reversing the liquid crystal pixels in the liquid crystal molecules deflection angle to the background light and realize the restoration of the picture, there is no such as CRT internal with ultra-high voltage components, not to appear due to high pressure caused by x-ray exceeded. Moreover, the simple structure and circuitry of the machine, modularity and high integration of the chip is enough to minimize the electromagnetic radiation generated when the circuit works. This design directly reduces the power consumption of the circuit, the heat is also very small. Although LCD monitors may produce slight electromagnetic radiation when working, but it is easy to solve through the shielding circuit. CRT monitors, on the other hand, must not drill holes in the shield to cause radiation leakage due to heat dissipation considerations.

2, thin and lightweight. It is the emergence of LCD monitors that made the invention of laptop computers possible. Similarly, desktop LCD monitors, although in size and weight than the laptop computer are a little larger, but, relative to that bulky and heavy CRT monitors are small. Comparison of 15-inch display, CRT monitor depth is generally close to 50 centimeters, while the depth of the latest Jaws LCD monitor NF-1500MA is less than 5 centimeters! With the change of consumer views and living environment, people are demanding more and more on the volume as well as weight of home appliances. LCD monitors with its slim and lightweight innate advantages to become the most likely to break the monopoly of CRT monitors display devices.

3, accurate image reproduction. Liquid crystal display is a direct digital addressable display, it will be able to video card output video signal after AD conversion, according to the signal level in the "address" signal, the video signal directly on the screen corresponding to the LCD pixels on the display. CRT monitor is to rely on the deflection coil to generate an electromagnetic field to control the electron beam on the screen to achieve the purpose of periodic scanning to display images. Due to the electron beam trajectory is susceptible to environmental magnetic field or geomagnetic influence, can not do the absolute positioning of the electron beam on the screen. So CRT monitors are prone to geometric distortion of the screen, linear distortion and other phenomena that can not be eliminated. And liquid crystal display does not exist this possibility. LCD monitors can be perfectly presented on the screen, without any geometric distortion, linear distortion.

4, display characters sharp. The screen is stable and does not flicker. LCD's unique display principle determines the uniformity of the individual pixel light on its screen, and red, green and blue pixels are closely arranged, the video signal is sent directly to the pixel behind the pixel in order to drive the pixel light, so there will be no traditional CRT monitors inherent agglomerations as well as focusing on the ills of the poor. Therefore, the text display effect on an LCD monitor is vastly different from that of a traditional CRT monitor. Liquid crystal display fonts are very sharp, no CRT monitor display text fuzzy fonts, fonts and other phenomena such as discoloration. Moreover, because the liquid crystal display has been in the light after the power, backlight work in high frequency, display screen is stable and does not flicker, conducive to the use of computers for a long time. CRT monitors rely on the electron beam repeatedly hit the phosphor to achieve the light-emitting, which will lead to periodic flicker of brightness. After a long time of use is likely to cause discomfort in the human eye.

5, easy to adjust the screen. Liquid crystal display direct addressing display mode, so that the LCD screen adjustment does not require too much geometric adjustment and linear adjustment and display content position adjustment. Liquid crystal display can be very convenient through the chip calculations automatically adjust the screen to the best position, this step you only need to press the "Auto" button can be completed. Save the CRT monitor and the tedious adjustment. You only need to manually adjust the screen brightness and contrast to make the machine work in the best state.

LCD monitors have these innate advantages, has been a sufficient threat to CRT monitors, the only regret is that due to the limitations of the manufacturing cost of LCD monitors, the current price of LCD monitors is still relatively high.

Disadvantages of liquid crystal displays

Now there are many low-priced 14, 15-inch LCD monitors on the market for sale, many businesses will be touted to the sky to go, admittedly, LCD has a number of very obvious points, just for various reasons, the current sale of low-priced LCD are just belong to the LCD products inside the "low-end", itself has a number of inherent weaknesses. ", itself has a number of inherent shortcomings, the following we analyze in detail in the end what are the shortcomings of these LCD monitors.

1, the price

Although it is said to be low-priced, but the CRT compared to the price of LCD monitors in the display family can be described as "price of the aristocrats", just 15 inches on the 3,000 yuan, and the same size of the flat panel displays is only about $ 1,000 or so. Experts analyze the main reason for the high LCD screen is in the manufacturing process is very low yield, resulting in the cost can not be reduced. At present, the ability to produce liquid crystal screen only Japan and Taiwan's part of the manufacturer, the technology has not been fully diffused, has not yet formed a competitive situation of large-scale production, and the quality is also very different. In the international market, the price difference between different grades can reach tens to hundreds of dollars.

2, interface

The digital interface of the LCD monitor is high on the list. Theoretically, LCD monitors are purely digital devices, and the connection with the computer host should also be a digital interface, the advantages of using a digital interface are self-evident. First of all, it can reduce the signal loss and interference in the analog-to-digital conversion process; reduce the corresponding conversion circuits and components; secondly, there is no need to adjust the clock frequency and vector.

But most of the low-priced LCD monitors sold on the market today use analog interfaces, which are prone to interference with transmitted signals, require the addition of analog-to-digital conversion circuits inside the monitor, and cannot be upgraded to a digital interface. And, in order to avoid the appearance of pixel flicker, it is necessary to achieve the clock frequency, vector and analog signal is identical.

In addition, the digital interface of LCD monitors has not yet formed a unified standard, and display cards with digital outputs are not common in the market. In this way, the key advantages of LCD monitors, but it is difficult to fully realize. For now, the result of early consumption is to spend a high price to buy a furnishing.

3, small viewing angle

Early LCD visual deflection angle of only 90 degrees, can only be viewed from the front, from the side will appear larger brightness and color distortion. Now on the market LCD monitor visual deflection angle is generally about 140 degrees, for personal use is enough, but if several people at the same time to watch, the distortion of the problem appeared.

4, the corresponding time is too slow

Response time is a special indicator of the LCD monitor. The response time of the LCD monitor refers to the display of the pixel response speed of the input signal, the response time is short, the display of motion pictures will not produce the phenomenon of image trailing. This is very important when playing games and watching fast-moving images. Fast enough response time to ensure a coherent picture. At present, the general market, the response time of LCD monitors, compared with the previous has been a great breakthrough, generally about 40ms. But it still can't meet the requirements for 3D games and high-quality DVD movie playback.

5, brightness and low contrast

To play the torch? This joke is about the brightness and contrast of LCDs. Because the liquid crystal molecules can not emit their own light, so, LCD monitors need to rely on an external light source to assist the light. Generally speaking, 140 lumens per square meter is enough. There is still a gap between the parameter standard of some manufacturers and the actual standard. Here to explain, that is, some small-sized LCD monitors used to be mainly used in laptop computers, the use of two-lamp adjustment, so their brightness and contrast are not very good.

6, maintenance issues

LCD "bad point" problem. Liquid crystal display material is generally used glass, it is easy to break, coupled with each pixel is very small, often resulting in individual pixel bad phenomenon, commonly known as "bad spot", which can not be repaired, only the replacement of the entire display, and the price of replacement is often very expensive.

The launch of a new product has its own characteristics that are superior to those of the old product, and the superiority of LCD monitors lies in their lightness and simplicity as well as in the ring to protect the eyes. But because of the current stage of the LCD products at the same time there are the above defects, not yet able to meet all the needs of consumers. In this product technology premise, we call on consumers, do not blindly follow the fashion trend, but to recognize their own needs and product features, to make the most objective, practical choice.