What are the differences between AMOLED screens?
Today we will talk about the interesting arrangement of the sub-pixels of the OLED screen.
Let's review the following screen technology architecture diagram:
Screen technology corresponding to screen structure diagram
Our focus today is on the top half of the penultimate column, which is the RGB arrangement and the PenTIle arrangement. When introducing the OLED screen, we said that Samsung found that the sub-pixel life of red, green and blue sub-pixels is not the same in the process of developing SuperAMOLED screen. The life of red and blue sub-pixels is relatively short, especially blue. There are two ways to stand in front of Samsung, or stick to the traditional RGB arrangement, but once the pixel density exceeds 300ppi, the life of the screen is difficult to guarantee unless the sub-pixel luminescent material is replaced. This road was not realistic for Samsung at the time. The bottleneck of R&D technology was destined to only take the second route, that is, to replace the sub-pixel arrangement, that is, to change from RGB arrangement to PenTIle arrangement.
What is the difference between PenTIle and RGB? The RGB arrangement screen will control the sub-pixel ratio of the three primary colors of red, green and blue to 1:1:1, thus ensuring that the display color tends to be standardized. The classic representatives are Samsung S2, the first generation Moto X, Samsung Note II and OPPO Finder. The AMOLED screen with this arrangement is no different from the normal LCD screen in daily display, and there are no common problems in the PenTIle arrangement, such as the jaggedness of the edges of the text and icons, the color edge phenomenon, and the color of the screen. shift.
Although they are all RGB arrays, the arrangement of the Samsung S2 and OPPO Finder in the above four models is not similar to that of the Samsung Note II and the first generation Moto X. Please see the following figure:
Samsung S2 (left) and Samsung Note II (right)
We call the left RGB array as a standard RGB array, and the liquid crystal IPS alignment of the LCD screen is not much different, and the right RGB array is called the new RGB array. The similarity between the two is that the red, green and blue sub-primary pixels adopt a 1:1:1 ratio. The difference is that the latter slightly enlarges the blue sub-pixels, but does not exaggerate like the Pentile arrangement, and then reduces the brightness of the blue sub-pixels to ensure longevity. So the screen display seen on Samsung Note II and the first generation Moto X is not much different than the normal IPS LCD screen. With the same screen size and resolution, the AMOLED screen model with RGB arrangement does not have the problem of insufficient detail compared to the LCD model.
As the LCD camp continues to push up ppi, 1080P, 2K resolution step by step to crush the OLED camp, Samsung found that if you continue to use RGB arrangement to develop AMOLED screen will definitely be eliminated by the market. In the Samsung S4, the Pentile arrangement was re-enabled and the resolution was further increased from 720P to 1080P to tame the side effects of the Pentile arrangement. What are the side effects of the Pentile arrangement? We continue to explain with pictures.
Pentile arrangement (left) and RGB arrangement (right)
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