When buying TV, we often encounter this situation. The same size TV of the same brand uses the same panel. The software and hardware used in the introduction are also similar, but the price is often several thousand. There is also a big difference in picture quality. Why is this? In fact, we often overlook a part of the cost of LCD TVs, which is the backlight. The backlight not only plays an important role in the picture quality of the LCD TV, but also the difference in the backlight will have a great impact on the cost/price of the TV.
Straight down and side entry, LED backlighting in two ways
We all know that there are many types of backlights for display devices, such as EL, CCFL, LED, etc. Of course, with the popularity and development of LCD TVs, LEDs have become the most suitable backlight for TVs. The working principle and lighting concept of LEDs are not mentioned here. In terms of the color form of the backlight, LEDs are divided into white LED backlights and RGB-LED backlights. RGB-LED backlights are obviously better in color and quality. Stronger, but the price is exaggerated, so most LCD TVs on the market use white LED backlights.
In addition, LED backlights can also be distinguished according to the installation method, one is called direct type, and the other is called side entry type. The direct type is to arrange the LED light-emitting die evenly behind the liquid crystal panel (screen surface) as a light source, so that the backlight can be uniformly transmitted to the entire screen; and the side-in type is to arrange the LED die around the liquid crystal screen. The edge, together with the light guide plate, allows the LED backlight module to emit light, and the light emitted from the edge of the screen is transmitted through the light guide plate to the area in the center of the screen, so that the overall amount of backlight is sufficient for the liquid crystal screen to display the image.
In short, in the backlight system, the direct type is a light source method in which dots are arranged as a surface, and the side entry type is a light source method in which dots are arranged as a line. These two methods have their own advantages and have a great impact on the final performance of the TV.
Side-in type is the light bar (light source) on the edge of the screen, there are many LED lights on each light bar; the direct-lit backlight means that the back of the screen is full of LED lights, the number of LED lights is much more
Image quality and thickness, direct and side-entry advantages
The advantage of the direct type is that different backlight module rights can be set separately. In theory, each LED can independently control the brightness, but the line and design cost are not easy. Therefore, in the actual product, the design of sub-regional control is adopted, so that each region can independently adjust the brightness and darkness. The more LED lights used in direct-lit light sources, the more areas the backlight divides, and the better the picture quality of the TV. For example, Toshiba's new generation of high-end 4K TV Z20X series backlight area is more than 200, each area can independently adjust the brightness, the effect is naturally better, of course, the cost is also high and bizarre.
The direct-lit backlight is a surface light source placed behind the screen, so it has a natural advantage in brightness uniformity, and more importantly, its light leakage is better controlled. Moreover, the direct-lit backlight can adjust the brightness of the screen in a partial area to make the bright part brighter and the dark part darker, so its contrast effect is stronger than the side-in backlight, and the energy saving effect is better. In addition, due to the limitation of the installation method, the side-lit backlight can only use white LED, while the direct-lit type can use white LED and RGB-LED backlight. If RGB-LED backlight is used, then the color gamut value The direct-lit backlight will also be much stronger than the side-in backlight, but also because of the cost, the direct-lit RGB-LED backlight will only be used in high-end products.
Backlight form of high-end direct-type TV
The side-entry backlight is actually installed on the four sides of the panel with LED strips (only two on the left and right, four on the top and bottom), and then use the light guide to transport the edge light to the center of the screen. This method naturally has an adverse effect on the uniformity of brightness and light leakage, but its biggest advantage is two points: one is low cost, the light guide plate and LED strip are not expensive; the other is because the LED light is distributed on the side of the screen. So the thickness of the LCD TV can be made very thin.
In addition, with the improvement of technology and the increase in the number of LED strips, the side-entry light source has gradually improved in image quality. For example, the number of light bars and the improvement of the light guide plate can realize each line (column) screen. The area control, the birth of quantum dot technology and the improvement of the panel color also make the side-in products not lose to the direct-type products in the gamut value (of course, the color transition and look and feel is still worse than the high-end direct-type TV).
Side-lit light-backed TV with light strips placed around the panel
It is worth mentioning that the quality of the LCD TV is not better than that of the side-lit LCD TV. We can only say that the quality of the direct-lit backlight mode is higher than that of the side-lit backlight. Some manufacturers' direct-type TVs use less LED lights and do not have more backlights. The picture quality is not stronger than the mainstream side-in TV. For example, Lenovo has introduced a direct-lit backlight LCD of less than 3,000 yuan. TV, the quality of the picture is not outstanding. And those high-end direct-down TVs use thousands of LED lights, so the effect is definitely stronger than the side-entry TV (the number of side-in LEDs is only a few hundred.)
Look at the thickness, check the information, teach you to distinguish between direct and side-mounted TV
As we said, looking at the way of backlighting, we can't arbitrarily make conclusions about TV quality. However, it is very important to know what backlighting is used in a TV. At least it allows us to know the truth of the manufacturer's publicity. For example, a TV uses a side-lit backlight and the price is relatively low. It doesn't make much sense for this TV to boast of any smart light control and regional light control. Below we briefly talk about several ways to distinguish between direct-lit and side-lit LCD TVs.
The first is to look at the thickness. At present, the ultra-thin TVs on the market are almost all side-lit backlights, because only the side-lit backlight can be made ultra-thin, the thinnest is only 1 cm thick, and the direct type is difficult anyway. Do it. Of course, if the user wants to choose a TV with good picture quality and thin thickness, he can only choose side-lit backlit LCD TV or OLED TV.
In addition, to understand what backlighting LCD TV is, you can also go to the official website of the TV. Generally speaking, the official website of domestic TV brands will not be clear about the backlighting method of their own TV (unless for publicity), but the specifications of foreign brands are clearer. For example, the direct backlight will be clearly expressed as “Backlight:Directâ€. The side-lit backlight is clearly indicated as "Backlight: Edge". It is worth mentioning that some domestic models of foreign brands will also clearly state the way their backlights are in the manual. For example, in the domestic 4K TV manual, Sony has written clearly the different models and sizes. Backlight mode.
Thinner TVs, usually with side-lit backlights
Last but not least, whether it is a side-in or a direct-type backlight, in fact, high-end and low-end TVs are used, the key is to look at the manufacturer's own technology and cost investment, different backlights of the TV, the picture quality is not absolute Of course, the high-end direct-lit backlight TV is certainly relatively expensive. What is certain is that the quality and quality of LCD TVs are definitely worth a penny. Perhaps high-end LCD TVs have a certain premium, but the current low-priced products of Internet brands are absolutely impossible and traditional high-end LCD TVs. Competing for quality.
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