To thoroughly understand the difference between In-Cell, On-Cell, and OGS screens, you must first know the basic structure of the screen. From top to bottom, the basic structure of the screen is divided into three layers, protective glass, touch layer, and display panel.
Traditional G/G and GFF screens are all standard structures of protective glass + touch layer + display panel layer, the difference lies in the touch layer. The touch layer of the G/G screen is composed of 1 layer of ITO glass substrate and 1 layer of ITO touch film, while the touch layer of the GFF screen has 2 layers of ITO glass substrate and 2 layers of ITO touch film. Obviously, the G/G screen is thinner.
OGS screens, InCell screens, and OnCell screens all have a structure of a protective glass layer + display panel layer, which lacks a touch layer and is lighter and thinner. Where is the touch layer in the middle? This happens to be the key to distinguishing InCell screens, OnCell screens, and OGS screens. InCell and OnCell screens integrate the touch layer and the display panel, and the OGS screen integrates the protective glass layer and the touch layer.
Incell Technology
Incell technology refers to the technology of embedding the function of the touch panel into the LCD pixel, that is, embedding the touch sensor function inside the display screen, so the original 3-layer structure: protective glass + touch screen + display has become a 2-layer structure: protective glass + touch functional display, which can make the screen thinner and lighter. The technical threshold is relatively high.
Oncell Technology
OnCell technology refers to the method of embedding the touch screen between the color filter substrate and the polarizer of the display screen, that is, the touch sensor is equipped on the LCD panel, which is much less difficult than the InCell technology. At present, On Cell is mostly used in Samsung Amoled panel products, but technically it has not yet overcome the problems of thinning and color unevenness when touching.
OGS/TOL Technology
OGS technology is to integrate the touch screen with the protective glass, coats the ITO conductive layer on the inner side of the protective glass, and directly performs coating and photolithography on the protective glass. Since a piece of glass and one-time bonding are saved, the touch screen can be made thinner and less expensive. However, OGS still faces the problems of strength and processing cost, and both require secondary strengthening to increase strength.
Traditional technology (GG, GG2, GF, G1F, GF2, GFF, etc.)
The traditional full paste technology GG, GG2, GF, G1F, GF2, GFF, etc. all need to be pasted twice, the thickness is relatively thick, and the defective rate is high.
Conclusion
Among the three full lamination technologies, In-Cell is relatively better, but it is also the most complicated technology and has a low yield rate; the second is On-Cell, although the difficulty is much lower than that of In-Cell technology, it is not as good in terms of color. There is a problem of unevenness. If this problem is not solved, it may be replaced by In-Cell in the future. Finally, the most mainstream OGS screen is currently widely used. Compared with the former two, although there is a certain gap in terms of craftsmanship and effect, OGS is more mature in terms of technology and has lower production costs, which is the main reason why it is promoted by the majority of manufacturers.