A few years ago, screen grays were a common occurrence, but why don't we talk about them all these years?Because at present, even the entry machine within 1000 yuan has adopted the screen "GFF fully fit", but do you know what is the difference between GFF, OGS, TOL, on-cell and in-cell in the fully fit screen?
In the past, the screen is not fully fit the problem is poor permeability, when the screen can clearly see that the screen is a large gray rectangle, which is mainly related to its structure.When capacitive screens first became common, most mobile phone screens could be simplified to a three-layer structure: "glass + touch layer (glass)+ display layer".
Normal screen structures don't look very transparent
For ordinary screen, will the above three layers together will need to use adhesive, early process is only will stick around between layer and layer, so inevitably appears in the middle the air layer, and the three layer structure of "two layers of glass and two layers of air" can lead to the light reflection, then led to a very bad impressions, it is very easy to read even the screen.
GFF: fake all fit, 1000 yuan machine love
GFF solves the problem of light reflection between layers of structures
In order to solve the screen is not transparent and thick size and other problems, the GFF process appeared.It directly changes the middle touch layer glass of the above non-fully laminated mode into PET film, and completely fills the air layer with optical glue (water glue). As a result, a layer of glass is missing and the air layer is filled with water glue, the reflection phenomenon is greatly reduced, which brings a very significant perception improvement, and the screen is no longer gray.
At present, some models use GFF as a publicity point
Since the touch layer of the GFF process still exists independently, the "GFF fully fitted screen" is not exactly correct, or it is more of a cross between fully fitted and non-fully fitted.At present, GFF has been widely used in most low-end models. It has such characteristics as low process difficulty, high yield, and no great difference between appearance and full-fit process, etc. Therefore, many manufacturers use GFF screen for low-end models.In addition, because the multi-layer structure of GFF process is firmly combined together, the whole screen panel usually needs to be replaced after the screen is broken.
OGS/TOL: a process for increasing touch sensitivity
OGS/TOL is a true holdover
In fact, from here to start is a fully laminated screen, OGS fully laminated refers to the direct touch layer in the protection of the glass inside, so the whole screen from three layers of "glass + touch layer + display layer" into two layers of "glass (with touch)+ display layer", thickness reduction.The two layers are still bonded by water and glue, and the permeability is improved compared with the GFF above.At the same time, because the touch layer is next to the screen protection glass, so OGS also brings the improvement of touch sensitivity, domestic models using OGS Nubia Z9 mini and many other high-end models.
When it comes to OGS and TOL technology, the two technologies are roughly the same in structure, but the process to achieve the final effect is not quite the same.When producing the screen panel, OGS installs the touch layer first and then cuts it into the size of the mobile phone screen, while TOL installs the touch layer first and then cuts it.There are two ways to achieve the same effect, mainly because the latter TOL can be reinforced again after glass cutting, and the final screen is stronger than OGS, but this approach costs more.The meizu MX2 has previously used TOL technology above.
In-cell: thin is in-cell
The touch cell in the in-cell is interwoven with the display pixels
For the pursuit of thin mobile phone industry, even a few millimeters of glass panels are not let go.So - cell is in pursuit of product of thin, it will touch the floor directly and display panel "fit", touch unit and display pixels are intertwined, and the high technology difficulty, roa is also low, but apple's iPhone 5 in a few years ago it had begun to adopt this technology, almost can be seen as a kind of opportunity cost, in pursuit of thin screen breaks down, it was very expensive to fix it.Of course, it's the consumer who pays for it, and the iPhone never fails to sell.
Most models with AMOLED screens are on-cell models
Compared with the in-cell above, it can be seen from the literal sense that it makes the touch layer above the display layer, so both the process difficulty and the yield can be improved, but after all, the touch cell cannot be integrated into the display layer, so the thinness cannot reach the level of in-cell.On-cell screens are represented by samsung's AMOLED screens.