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What is the relationship between TN,IPS,VA screens in computer displays and Amoled,oled,ips in smartphones?

Views: 212     Author: Andy     Publish Time: 2023-05-17      Origin: Site


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What is the relationship between TN,IPS,VA screens in computer displays and Amoled,oled,ips in smartphones?

There are two main categories: 

LCD and OLED. LCD is a liquid crystal display, which is passive light; OLED is active light. These are two completely different types of display devices with completely different display principles.

TN, IPS, VA, and so on are all TFT LCD screens. The principle of LCD screens is that the backlight becomes polarized light through the rear polarizer, and then different voltages are applied to the liquid crystal molecules to change the direction of polarization, and then it is seen through the front polarizer. Because the angle of polarized light and the polarization direction of the front polarizer determine the amount of light, resulting in different brightness, the proportion of different brightness of the three primary colors enters the human eye to produce a variety of color vision.

While OLED (AMOLED is a kind of OLED) and microLED are light-emitting diodes (LED). They generate light of different brightnesses by controlling voltage or using PWM. Different proportions of the three primary colors enter the human eye to produce different color vision.

Since LCDS can't completely block backlight even if they are black, black is not pure, and backlight requires constant light, so it consumes relatively more power (for low-brightness images).

Leds are self-luminous, so they're pure black when they're not. However, for some reason, a pentile arrangement is now common in OLED, in which two pixels share a sub-pixel of one of the three primary colors (usually green), resulting in a lower actual resolution than the nominal one, but with the improvement in resolution, the impact is not significant.

LCD, according to the driving mode, can be divided into PMLCD and AMLCD two; according to the liquid crystal arrangement mode (display principle), it can be divided into VA, IPS, and TN three (this is the most mainstream three; of course, there are others); these are two different classifications.

According to the driving mode, OLED can also be divided into PMOLED and AMOLED.

Let me explain active and passive luminescence first. The display we use is usually made up of many pixels. For example, we often use LCDs; their pixels do not emit light; LCD pixels are just a light valve; the light we see is actually emitted by the backlight inside the LCD; its pixels are only used to control the penetration and occlusion of light. OLED is completely different from LCD in that each pixel actually emits light, so OLED doesn't need a backlight.

Explain again, AM and PM. AM stands for active matrix, and PM stands for passive matrix. AM and PM are both methods used to drive pixels on the screen. The PM driver structure is simple, but the disadvantage is that there is no way to accurately address the pixels on the screen, and there is inevitably crosstalk, so the display capacity is limited. AM uses active driving elements (generally TFT, so AMLCD is also commonly referred to as TFT-LCD) with a complex structure. The advantage is that it can accurately address any pixel on the screen, avoiding crosstalk in principle and greatly improving the display capacity.




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