Touch screen technology science knowledge: In-Cell, On-Cell, OGS
At present, there are several development directions in the field of touch screens: OGS solutions led by the original touch screen manufacturers, and On Cell and In Cell technology solutions led by panel manufacturers.
At present, more powerful display panel manufacturers tend to promote On-Cell or In-Cell solutions, mainly because they have display production capacity, that is, they tend to make the touch layer on the display screen; and touch module manufacturers or upstream materials Vendors tend to OGS, which is to make the touch layer on the protective glass. The main reason is that it has strong manufacturing process capability and technology.
The commonality of both can reduce the number of fits, which can achieve cost savings and improve the yield of fit. In addition, due to the lack of a touch layer, it is also possible to save material costs and achieve thinning, and the Apple iPhone5 uses In-Cell technology.
In-Cell
In-Cell refers to the method of embedding the touch panel function into the liquid crystal pixels, that is, embedding the touch sensor function inside the display screen, which makes the screen thinner and lighter. At the same time, the In-Cell screen should also be embedded with the matching touch IC, otherwise it will easily lead to wrong touch sensing signals or excessive noise. Therefore, for any display panel manufacturer, the threshold for cutting into In-Cell/On-Cell touch screen technology is indeed quite high, and the need for a low yield is still low. In-Cell technology is currently used in addition to Apple's iPhone 5, as well as Nokia's Lumia 920. The thickness of the iPhone5 screen is estimated to be 2.54 mm, and the contribution of In-Cell thinning is 0.44 mm, which accounts for about 25% of the thickness reduction of 1.7 mm.
iPhone5 has less touch screen than iPhone4S
Although Apple is currently pushing the In-Cell technology, it will still be limited to high-end smartphones in the next few years. The main problem is the yield. Because In-Cell loses more than just the touch screen, the display also Will be scrapped together, so manufacturers have higher requirements for In-Cell yield.
On-Cell
On Cell 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 arranged on the liquid crystal panel, which is much less difficult than the In Cell technology. Samsung, Hitachi, LG and other manufacturers have made rapid progress on the On-Cell structure touch screen. At present, On Cell is mostly used in Samsung Amoled panel products, and the technology has not been able to overcome the problems of thinning and uneven color when touch.
In-Cell vs. On-Cell
OGS
OGS technology integrates the touch screen with the protective glass. The ITO conductive layer is plated on the inside of the protective glass, and the coating and lithography are directly performed on the protective glass. Since the glass is saved and the bonding is once, the touch screen can do more. Thin and cheaper. At present, domestic mobile phone brand manufacturers such as Tianyu Hornet 1st Generation, Jinli Fenghua, and Xiaomi 2 have adopted OGS technology.
However, OGS still faces the problem of strength and processing costs. Since OGS protective glass and touch screen are integrated, it is usually necessary to strengthen, then coat, etch, and finally cut. This cutting on tempered glass is very cumbersome, high in cost, low in yield, and causes some capillary cracks in the edge of the glass. These cracks reduce the strength of the glass, and the current strength is an important factor restricting the development of OGS.
In-Cell is the thinnest of the three options
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