Before figure out why the 3D touch is unstable at iPhone 6S screen assembly, let’s learn about how the 3D touch works. 3D touch enables phone users to interact with the iPhone by applying vertical force. The vertical force strength is sensed, calculated using the strain sensor and taptic engine.
There is a strain sensor under the LCD backlight. When the finger press down the cover glass lens, there would be a slight deformation of the glass which will shorten the distance between the glass and the strain sensors. When one sensor receives the signal the the distance in between has been changed, the system will compare the signal received nearby to calculate where the touch happened and how much strength is applied.
Since those non-OEM assembly adhesive use liquid optical clear adhesive aka. LOCA instead of using Optical Clear Adhesive aka. OCA on OEM assembly, the LOCA glue behind the screen will be squeezed nearby which will affect the distance calculation. This will cause the malfunction of the 3D touch function.
LOCA glue is cheap and not solid which will affect the 3D touch effect and hence, don’t choose any non-OEM 6S or 6S plus screen assembly at this moment unless the manufacturers are using the better glue.
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