—— Q & A——

How long is the life of an LED TV? The service life of LED TVs is generally 50,000 hours. Calculated by watching 8 hours of TV every day, the average service life can exceed 10 years.

What are the types of LCD panels?

There are almost four types of LCD panels in the market. The first is SONY, Samsung's PVA screen (SPVA), the second is Hitachi, Panasonic, LG, Philips' IPS screen, the third is Sharp's ASV screen, and the fourth is the common TN panel of computer monitors; The first category, PVA screens have bright colors ~ high brightness, superior contrast, and anti-noise points are very good, but it is easy to get tired of the eyes for a long time, but the color gamut is very wide, which can be up to 93% or even 96%. !! It is quite amazing, and the rate of dead pixels is relatively low. And the texture is done quite well. The inside point IPS screen is slightly worse than the high end. The disadvantage is that the uniformity of the color of the screen is slightly worse; The second category, IPS screens, is reflected in the small size LCD. If you buy a small size, the best choice for IPS screens is color, contrast, and dynamics. The color gamut is more than 90%, and professional D can achieve More than 100%. There are several disadvantages. The first series has a large screen that is easy to leak light and bad points. The second series has a slightly worse texture (LG) except for high-end models. However, IPS is the most perfect for small-sized TVs such as 32 inches. The panel is impeccable in all aspects. Unfortunately, the TVs at home are respected, so it is difficult to realize its advantages. The third category is ASV screens. The colors feel real and are more durable. However, the color gamut is up to 80%, and the picture is slightly white. Sometimes, there is a feeling of overexposure. The texture and color are inferior to the IPS screen ~ The advantage is that the effect of watching the cable is very good. In addition, Sharp's after-sales protection for bad points is relatively poor. The fourth type of TN panel is mostly used in monitors.

How to wipe the LCD screen?

First turn off the monitor and cut off the power, then wipe the shell part with a soft cloth of clean water (do not use alcohol to avoid damage to the shell); please use a cotton cloth to gently wipe with as little water as possible, it is recommended not to wipe the panel often Therefore, it is inevitable that the panel will be pressed during the process, and black spots are easily generated.

What should I pay attention to when using an LCD TV?

When using an LCD TV, you need to pay attention to the following issues: 1. Do not use the LCD TV in a humid environment (such as a bathroom, kitchen, near a washing machine, etc.); 2. Do not use foreign objects to block the TV's cooling space (top of the machine) and keep it away from heat sources. Avoid shock and vibration when moving. Use the machine's outer packaging as much as possible before moving. 3. Do not allow metal objects or liquids to enter the TV, which will cause a short circuit, resulting in failure and danger; 4. Unplug the power cord and antenna cables during a thunderstorm or when not in use for a long time to avoid lightning strikes; 5. The guaranteed power supply is good, does not generate overvoltage, and has a good ground;

How is the remote control maintained?

1. When the battery fails, please replace it in time to avoid battery leakage and corrosion of the circuit board. If the remote control is not used for a long time, please remove the battery 2. Do not subject the remote control to vibration, do not allow children to play with the remote control, and avoid damaging the remote control; 3. Do not place the remote control near liquids, and do not place it in a highly humid environment; 4. The remote control may not work correctly if the remote control signal receiving window on the TV is exposed to direct sunlight or strong light or some lights with more infrared components. In this case, please change the light, turn off the light, adjust the angle of the LCD TV, or move the remote control closer to the signal receiving window; 5. Different types of batteries have different physical characteristics. Do not mix different types of batteries. Do not mix new and old batteries, and mix new and old batteries.

What is the difference between dynamic contrast and static contrast? 1. Static contrast is the actual contrast index of the machine. Its definition refers to the average brightness in a dark room divided by the average brightness in a black screen. 2. Dynamic contrast refers to the contrast value measured under certain specific conditions, that is, the brightness ratio of the brightest and darkest parts of the screen at a certain instant. For example, each area of the screen is tested one by one, and the contrast value of the area with the highest contrast is used as the contrast parameter of the product. Different manufacturers have different measurement methods for dynamic contrast, but the idea is to try to measure the highest dynamic contrast value, which is not the true ratio of the machine. 3. Dynamic contrast and true contrast are two different concepts. Generally, the dynamic contrast of the same LCD TV is 3-5 times the actual contrast.

Is there a relationship between the production line generation of LCD panels and the quality of LCD panels? 1. It is a misunderstanding to associate the production line generation of LCD panels with the quality of the screen. The main method of distinguishing production line generation is the difference in the cutting process of LCD screens. Generally speaking, production lines below the 5th generation can only cut the size below 20 inches LCD screen, large-screen LCD screen can be cut only with the 6th generation and above. The 6th generation line is more suitable for cutting 37 and 42-inch screens, and the 7th generation line is suitable for cutting 40-inch screens. 2. The cutting method of the screen has nothing to do with the quality of the LCD panel. The entire LCD panel involves backlight, polarization, control circuits, color filters, and LCD screens. It is a comprehensive evaluation. On the contrary, the new production line may have the possibility of instability, and the low-generation production line is generally relatively stable, so it is not accurate to judge the quality of the screen only from the generation number of the production line.

What are the common analog TV systems? What is the difference between TV system and AV (video) system?

Currently used for color TV broadcasting are NTSC, PAL and SECAM. Briefly described as follows: 1. NTSC system The NTSC system is the abbreviation of National Television System Committee. This system solves the problem of compatibility between color television and black and white television broadcasting, but has the disadvantages of easy phase distortion and unstable color. The main areas used include the United States, Japan, Taiwan, etc. 2. PAL system The PAL system is to overcome the sensitivity of the NTSC system to phase distortion. PAL is the English Phase Alteration Line. The main areas used include China, Australia, Southeast Asia, most of Africa, and parts of Europe, making the most widely used TV system currently. 3. SECAM SECAM is just a TV system for sequential transmission. The main areas used include the former republics of the former Soviet Union. LCD TVs with fewer applications generally support the full system on the video (AV interface of DVD), but on radio frequency (cable TV), enerally only supports multiple formats

What is the viewing angle?

The viewing angle refers to the angle at which the screen in front of the screen can be clearly seen when the contrast can reach a certain value (such as 10); the larger the angle value is, the problem that the picture cannot be seen clearly due to a slight change in the viewing position. When the top and bottom and left and right are symmetrical, the angle values on both sides can be added and marked as horizontal 160 °, vertical 160, or left / right ± 80 ° and up / down ± 80 ° respectively. Theoretically, the larger the viewing angle is, the better. In fact, the requirements of the left and right viewing angles are generally greater than the requirements of the upper and lower viewing angles. A reasonable choice for actual use conditions is helpful for a cost-effective choice.

What is resolution? What is the relationship between screen resolution and image format?

1. The resolution of an LCD TV indicates the number of pixel points that can be displayed on the screen. This is a fixed value and cannot be adjusted. Under the same size, the higher the resolution, the finer the screen that can be displayed, and the higher the specifications. 2. For a screen with a resolution of 1366 * 768, if it can support a resolution of 1080i (1920 * 1080i) or 1080P (1920 * 1080P) format on the signal channel, because the physical resolution of the screen and the resolution of the image do not match, the actual The display effect is not as clear as the point-to-point display. 3. The high resolution of a single support signal does not have much practical significance. Only when the resolution of the screen and the resolution of the image are equal (point-to-point display), the displayed picture is the best. The further away from the screen's resolution, the theoretically the display will blur.