The basic structure of the touch screen is divided into three layers: protective glass, touch layer, and display panel.
When you look at your mobile phone screen, have you ever thought about how the three-layer structure of the screen fits together?
There are two types of touch screen lamination technologies: frame lamination and full lamination.
Frame lamination(Air bonding)
Double-sided tape is used to fix the four sides between the touch screen and the display.
As shown in the figure below, the advantages of Air bonding are low technical difficulty and low cost. The disadvantage is that there is an air layer between the display and the touch screen bonded using double-sided tape, which will greatly reduce the display effect after light is refracted.
Full lamination(Optical bonding)
The touch screen and display are seamlessly bonded using water glue（LOCA） or optical glue(OCA)
As shown in the figure below, there is no air between the screens with full lamination technology, which can greatly reduce light reflection, reduce light loss, and thereby increase brightness. However, the investment cost of using glue for bonding is higher and rework is more difficult.
Comparison of two laminating processes
Both lamination processes have their own advantages and disadvantages, but from a comprehensive evaluation from the perspectives of cost, display effect, maintenance, etc., the full lamination process is the main development trend of the current lamination process. On the one hand, the full lamination process better bonds the gaps between the layers, reducing the probability of air and dust entering; on the other hand, the full lamination technology removes the air between the screens, which can greatly reduce the reflection and loss of light, making the picture more beautiful. More transparent; in addition, the full lamination process is thinner and has better restoration when displaying the all-black effect.
