Home > News > Industry News

How to distinguish LCD, OLED, IPS, VA, TFT and uled in the display screen?

Upload time:2021-11-12

Firstly, LCD and OLED are two categories. LCD relies on LED / CCFL backlight, while OLED is active. You can also understand that each pixel of the OLED screen is a small bulb, while the LCD is a few large bulbs behind the shutter. In this regard, it is easy to find that OLEDs have inherent advantages in thickness and contrast. According to the "shutter", that is, the deflection mode of liquid crystal molecules, the mainstream of LCD is TN IPS va. in principle, TN response is fast, but the color, contrast and visual angle are slightly poor. An example is the screen of mainstream low-end laptop. IPS (including similar FFS and PLS) has a wide viewing angle, but its light transmittance is low and its response speed is not fast. The visual angle of VA screen is between the above two, because the vertical deflection of liquid crystal molecules has great advantages in contrast. The high generation panel lines of sharp / Youda / Samsung / Qimei are VA / CPA. This is just the opposite of the mobile tablet. But there are differences on mobile phones. The TFT screens of mobile phones now actually refer to VA screens, such as Sony Xperia Z. However, VA has no advantages in mobile phones for various reasons. Now all mobile phone screens need TFT driver. In a broad sense, all mobile phone screens are TFT screens. Why did we have a TFT screen before? Because the early LCD screen was a TN screen (this is different from the current TN meaning and represents passive drive), while TFT brought active drive, which greatly improved the display effect of the display. Therefore, TFT was a noble thing at that time, and manufacturers also liked to label passive driven LCD screens, such as your electronic calculator. Now display manufacturers prefer to mark with panel type, such as IPS / VA. The material and structure adopted by TFT determine its electron mobility and aperture ratio (you can understand it as the light transmission performance of louver). The performance from low to high is a-Si igzo LTPS / CGS. Now it is generally better not to use ASI TFT for screens exceeding 200ppi. Otherwise, the light transmission is too low, and the LED backlight power needs to be increased, resulting in more power consumption and heating. IPad 3 was an example before. SLCD in the field of TV panel refers to the 8.5 generation VA panel line jointly invested by Sony and Samsung. The panel produced is the famous PSA SPVA, or splicing screen. On the mobile phone, it is the marketing term of HTC. IPS / FFS / ahips supplied by Sony (JDI) / LGD / sharp are uniformly called SLCD by HTC. In fact, it was originally used to deal with Samsung's cessation of supply of G7 AMOLED screens and purchase high color gamut FFS screens from Sony. OLEDs are divided into AMOLED and PMOLED according to whether they are driven by TFT. PMOLED is the OLED on the monochrome display of oppo x1. As for uled, it is the marketing term of Hisense. It uses quantum dot technology to expand the color gamut, which is actually the same thing as Sony's triluminos. But it is still led backlit LCD in essence. By the way, there is no real LED TV or display except the cled machine in Sony lab. Because if you want to be serious, LED TV should make the LED tube as small as pixels. Finally, it is the same thing as OLED screen, but the lamp tube is inorganic. This concept was first used by Samsung to publicize its own TV, because at that time, the mainstream LCD TV used CCFL backlight, and using LED as backlight can improve contrast brightness and reduce thickness. However, Samsung's publicity made people mistakenly think that the display essence of TV has changed. If you go to the appliance store now, the so-called LED TV uses LED backlight, and the LCD is CCFL.