we all know, the digitizer touch screen assembly in most smartphone is assembled by Glass Lens and digitizer touch screen. However, depending on the digitizer touch screen made of ifferent material, such as glass and film, these different LCD screens have different features and performance.
Now we use LT,JDF,TM,OEM iphone lcd as an example.
TM LCD Screen
OEM iPhone manufacturers use In-cell technology to make the LCD screens, while 3rd party manufacturers have to choose other economic methods due to cost and risk. TM manufacturer adopt the G+F structure, which build the senor part on a film layer then assemble the film layer with the glass lens to be a whole digitizer touch screen. If you pay more attention to the corners of the LCD screen assembly, you can find out the film edge and rip it apart.
LT LCD Screen
Two years ago,, LT manufacturer use the OGS technology. to make the digitizer touch screen. The touch sensor is embedded on the glass lens and the cover lens is made very thin to make sure the digitizer work as good as possible to receive the command from fingers. The LT LCD screen is so thin that we can see the dots and diamond textures beneath the cover lens.
Please note it : LT do not use OGS any more now .
JDF LCD screen
JDF manufacturer use the G+G structure for its LCDs. G+G means glass plus glass. The digitizer touch sensor is made on a glass lens then the glass assembled with the cover lens as a whole digitizer touch screen assembly. Apparently, this kind of structure will increase the thickness of the digitizer touch screen, but it makes it possible that when the screen break, the digitizer screen works as usual. In the opposite, once the LT OGS LCD screen breaks, the whole LCD screen assembly goes bad, and it can't be repaired except replacing the whole part. By the way, the G+F and G+G structures both help prevent the bad situation. The G+G structure also helps light to come across the screen so that we can feel the display more bright and transparent. As far as we know from our supply chain partners, Apple iPhone 7 may use G+G structure on the screen.
TM LCD screen and JDF LCD screen both have a better solution for accidental screen break by building digitizer sensor on film or glass, however, as a coin has its two sides, though the G+F structure has a thinner digitizer touch screen, the film material is not good for light reflection, meanwhile the light cross through glass much easier on JDF screens. The difference lead to the different display performance.