What are the differences between IPS, LTPS, CGS, IGZO, and AMOLED? There are so many mobile phone screen technologies in the current world. This article aims to introduce various panels and screen technologies so that everyone can better distinguish them.
In recent years, mobile phone screen technology has emerged in an endless stream. As early as a few years ago, AMOLED and IPS screens began to be used on mobile phones. Later, there were screens such as CGS. Do you know what screens are used for iPhone5? In fact, the iPhone 5 uses another new mobile phone screen technology, namely the LTPS low-temperature polysilicon screen. What is the connection between such a variety of mobile phone screen technologies, and what is the difference?
At present, there are too many mobile phone screen technologies and panel types. Let's not talk about ordinary consumers. Players who often play mobile phones may be confused. It is necessary to interpret them.
First of all, we must emphasize that there are only two types of screens for mobile phones, namely TFT-LCD and OLED. Most of the OLEDs on the market are AMOLEDs, which represent passive and active display screens.
Today's manufacturers like to use the panel type to label TFT-LCD panels. Common panels are mainly TN, VA, IPS, CPA (AVS), etc., while a-Si, IGZO, LTPS and CGS are material technologies. At present, the common OLED screen on mobile phones is mainly based on Samsung's SuperAMOLED screen.
Historical review of the display screen
Active
The SuperAMOLED panel is called SuperActive Matrix Organic Light Emitting Diode.
LCD display technology is inherently affected (requires backlight support), so there is always a loss of brightness, and light will be polarized through two layers of glass and various films, which will bring color loss, and other pixels The increase in density is also more difficult and the cost will be higher, so people need a screen that can be close to lossless, so the self-illuminating attack-type display technology has been developed. This is what we call AMOLED.
Since it does not require thick glass and backlight panels, the light emitted by such a screen can be directly accepted by the human eye, so that the screen is an ideal screen regardless of color loss or viewing angle. However, God is always fair, and OLED has its insurmountable shortcomings, that is, the three-color luminescence loss is inconsistent.
We know that the white light is actually composed of three primary colors, namely red, green and blue. If we want to emit these three kinds of light, the energy we have to give is not consistent, which is reflected in the fact that the applied current is inconsistent (E =hv, the energy required for different frequencies is different), this is like you hit something, the more power you use, the more easily the tool is damaged, so the red-emitting electrode in AMOLED is more damaged than blue-green. The electrode should be slow, which means that the more the screen is used, the more reddish it will be. Therefore, in order to slow down this effect, some manufacturers will adjust the screen to be blue at the factory, so that the screen color will be normal after a period of use.
passive
Passive panels require backlight support, mainly in the following types.
The TN panel is called Twisted Nematic. The low cost is destined to be the most widely used one. TN is sometimes called TFT (well, this is a folk custom). The disadvantage of the TN panel is that the viewing angle is small and the color reproduction capability is limited.
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