TV Quality/TV Quality Ranking

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1. LCD TV quality ranking
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, HeiTi, 'Chinese Fine Black, Haier LCD TV
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Additional common sense: How to choose an LCD TV
In addition to the tricks introduced above when purchasing an LCD TV, there are other things that need to be considered, such as interfaces, LCD panel size, resolution, etc. In short, as a consumer, you need to learn more professional knowledge, not be superstitious about the parameters in manufacturers' advertisements, focus on your own actual viewing experience, and shop around, so that you can buy a satisfactory LCD TV.
How to distinguish various types of LCD panels
For flat-panel TVs, the display screen is the most important component, accounting for approximately /3 of the total cost. LCD screens are divided into ordinary screens, ordinary screens and professional screens due to different technologies and skills. This kind of display screen is a special screen for LCD TVs. It has greatly improved image resolution, color, and texture. It can truly reproduce digital high-definition image quality and is particularly suitable for the needs of digital TVs. LCD screens on the market today are divided into three levels: the best quality ones are Sharp screens, but they are not available at all, followed by screens from Japanese and Korean manufacturers, such as Samsung Electronics () and finally screens produced by Taiwanese manufacturers, such as AUO. and Chimei. Today, only these five major manufacturers have the ability to cut large-scale LCD panels above an inch. Choosing a panel from a large manufacturer with advanced technology will have advantages for future use, such as longer service life and color than low-end panels. The following introduces the characteristics and differentiation methods of several common LCD panels.
, check the picture tailing
The human eye has a certain reaction time when watching dynamic pictures. If the response time is long, the lag of the moving picture will appear, which will seriously affect the picture effect. If the response time is shorter, in When watching fast-moving pictures, you won't feel any afterimages or traces of drag. Picture tailing was a disadvantage of early LCD TVs, but with the continuous improvement of technology and technology, the response time of most LCD TVs has been shortened to milliseconds, and some even reached milliseconds. Such a short response time is now far shorter than Human eyes are quick, and the tailing phenomenon that was easily caused by fast-moving images in the past almost no longer exists. However, in addition to the response time, the optimization of the manufacturer's algorithm will also have a great impact on eliminating tailing and afterimage phenomena.
Nowadays, some LCD TVs have been improved with innovative technologies, completely eliminating smearing and afterimage phenomena. For example, Konka Sports TV uses digital motion compensation circuit and dynamic 3 noise reduction technology. This technology can quickly check the TV signal in an instant, adopt different processing methods for the moving area and the stop area, eliminate the snow blur of the moving picture, prevent the combing of the moving parts, ensure the proper sense of speed, and effectively eliminate the tailing scene.
When we buy a TV, we need to look at the TV screen from multiple angles. For example, choose the angle to face the screen, then shift some angles, and stand on the same horizontal line as the TV screen to see if When inspecting the machine after seeing the pictures, you can also ask the promoter to play some faster pictures to see if the movements on the pictures are connected and whether there is tailing in the picture.
Easily identify dead pixels and bright spots
When some brothers were buying LCD TVs, they saw that the picture shown by the promoter was very perfect, but after buying it for a while, the bright and dark pixels were broken. Dots appear on the screen one after another, which seriously affects the picture effect. It is not that easy to go to the merchant for explanation. So how can we identify whether the LCD TV has dead pixels or bright spots when purchasing? There are three methods to choose from:
The simplest method is to make the screen completely black and watch in pure blackness. Are there any highlights? Then make the screen completely white and see if there are any black spots. Finally, switch to red, green, and blue to check the completeness of the color points. If during the inspection, you find that there are more bad pixels than the national standard, don’t buy it.
Another method is to connect the computer to the LCD TV, and then display the required picture through a solid color picture in software such as , . You can also select a desktop of the corresponding color in the computer desktop properties to view. This method is the same as the viewing method when purchasing an LCD monitor.
The third method is to use disc viewing, which is a home theater audio-visual test disc. The original version of this disc has Chinese subtitles, explaining the complex test processes in detail. It enters the testing process when watching the disc. During the testing process, it can be seen at a glance whether the LCD TV has dead pixels or bright spots.
, Contrast is tricky
Contrast refers to the ratio of the brightness of the brightest pixels and the darkest pixels in the image displayed on the screen. It directly affects the transparency of the image, the vividness of the color and the clarity of the image. Spend. To put it simply, the higher the contrast, the whiter the white we see and the purer the black. But when you walk into a home appliance store, you will find that the marked contrast values are all kinds of, which makes people a little headache, such as effective contrast:, dynamic contrast:, maximum contrast, etc. If you think the higher the contrast, the better the product, then you are right. Manufacturer’s digital trap.
Originally, these numbers cannot reflect the contrast performance of flat-panel TVs. They are just numbers. The contrast effects of different brands, series, and types are indeed different, but their different sizes are the same. The numbers indicated are not directly related.
For the identification of TV contrast, when purchasing, you can ask the salesperson to put some discs with particularly dark scenes under normal lighting conditions, and adjust the contrast of the TV to the center to see if you can see the details of the picture clearly. For example, in the night scene, if you look at a black building, can you see it clearly? If the details cannot be distinguished, the contrast of this TV will not be very good in darkness. Then show some particularly bright pictures, such as surfing pictures under strong direct sunlight. The faces of athletes and the waves are clearly layered. If the details of the picture are lost and only white flowers are seen, then the contrast is not very good. Generally speaking, if the contrast is poor, the color will be severely mutated, losing its color and luster, and its texture and details will be unclear. In this regard, international brands may do better than small and medium-sized brands, high-priced LCDs do better than cheap ones, and small-sized screens are better than large screens.
. Prepare for a rainy day and keep an eye on the service commitment
LCD TV is a home appliance product with a relatively high technical content, which also means that once quality problems occur, repairing them is also a very troublesome task. When purchasing an LCD TV, consumers must learn more about the details of the three-guarantee product from the seller or manufacturer, including: the three-guarantee period for the complete machine, the three-guarantee period for major components, a detailed list of major components, etc. Most manufacturers provide warranty services ranging from 3 years to 3 years. Some manufacturers even provide free door-to-door service and reduction of repair costs during the warranty period. These small details should be clarified before purchasing, and the operators should be aware of the three guarantees. The commitment is clearly marked in text on the three-guarantee voucher or invoice.