Judging the quality of a TV? There are a thousand ideas out of a thousand people, but in the end it is the quality of the screen. This is the most fundamental thing. 
LCD screen 
The types of screens are now concentrated on three types: LCD, OLED, and quantum dots.
LCD panel is now a very common kind of screen, like the commonly used iPhone is to use LCD this panel, in the LCD panel is divided into two kinds of IPS and VA, that is, your common publicity in the hard screen and soft screen.
Only technically speaking, IPS and VA can only win each other. There is no superior or inferior player.
Many people say that the IPS hard screen is good and the response speed is fast. This is a relative problem.
For example, the SONY low-end W650 series adopts the IPS hard screen, while the highest-end X9300D uses the VA panel. The display effect of the two can be described as one by one.
OLED panel
There is no doubt that the quality of OLED technology is currently top-notch, with overwhelming advantages of key features such as excellent color, black level, and reaction speed.
OLED panel technology was recognized as the successor of liquid crystal technology in the early years, but it has not been able to completely solve the problems of service life, large-scale mass production, and cost over the years, leading to its delay in popularization.
The biggest difference between an OLED panel and an LCD panel is that the LCD needs a backlight and the OLED does not. Simply put, when the OLED needs to display a black background, the pixels can be turned off to display a purer black color and at the same time, be more power-efficient.
The hot iPhone X is now using this technology.
In terms of image quality, OLEDs are basically overwhelming. However, they are limited by the cost of production. Currently, the purchase price of OLED panels is relatively high, and the terminal price often exceeds 10,000 yuan.
Quantum dot screen Quantum-dot TV was firstly heated by TCL in China. The current quantum dot technology is actually just a small upgrade of LCD technology. By adding quantum dot filters between the backlight and the LCD panel, the color expression of the LCD panel is enhanced.
Compared with LED backlights, quantum dot technology can effectively reduce excessive blue light, thereby improving color gamut and color accuracy and achieving OLED-like effects.
As the saying goes, it is true that the price of products using OLEDs is generally high, which is caused by the yield of OLEDs and the difficulty of the process.
Quantum-dot TV is also a similar situation, due to a high-tech ** filter layer, the price will naturally be higher.
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