Soft OLED (or Flexible OLED)

Soft OLED screens are built around a flexible substrate, like the iPhone X’s original screen. Because the manufacturing process doesn’t substitute this key component, the soft OLED is a step ahead of the hard OLED in mimicking original screen performance. Its display size matches the dimensions of the OEM screen, and the flexible substrate gives the soft OLED a leg up in hardiness, allowing it to absorb more impacts without malfunctioning or breaking.

Soft OLED’s key features:

• Color Contrast: Excellent color contrast
• Color Accuracy: Excellent color accuracy
• Brightness: Good brightness
• Display Size: Equivalent to OEM
• Power Consumption: Equivalent to OEM
• Durability: Equivalent to OEM, higher than Hard OLED
• Price: Higher than Hard OLED

Hard OLED (or Rigid OLED)

Hard OLED screens are built using a hard glass substrate instead of the flexible substrate found on the iPhone X’s original screen. Two benefits of the switch from soft to hard are cheaper production cost and higher screen brightness. These come at the expense of display size and durability. The hard glass substrate can’t flex to accommodate the original curve of the display, so the screen has an enlarged bezel that fractionally, but noticeably, reduces the size of the 5.8” display.

The hard glass substrate is also more prone to damage than the soft OLED, and may crack more easily if dropped. It’s also worth adding that, while enhanced screen brightness sound like an added to bonus, it may be harsher to look at.

Hard OLED’s key features:

• Color Contrast: Excellent
• Color Accuracy: Good
• Brightness: Excellent
• Display Size: Reduced from OEM (results in an increased bezel size)
• Power Consumption: Equivalent to OEM
• Durability: Lower than OEM and Soft OLED
• Price: Lower than Soft OLED                                                                                                                                                                                               

  FOG COF & COG (LCD Screens)

• FOG screens

  The abbreviation FOG stands for ‘Flex on Glass’.
  FOG screens are LCDs that are 100% original, even though they are not installed by the original manufacturer. The separate components are supplied to an after-market manufacturer and glued to together there. The LCDs used for FOG screens are new.                                                                                                                                                                                 

  COG: Chip On Glass”, it is the most traditional screen packaging technology and the most cost-effective solution, which is widely used. Before the full screen has not formed a trend, most mobile phones adopt the COG screen packaging technology. Because the chip is placed directly on the glass, the utilization rate of the mobile phone space is low, and the screen ratio not high. Most simply Mobile phones are still using COG technology.

  COF: “Chip On Film”. This packaging technology is put the screen’s IC chip on a flexible FPC and then bends it to the bottom .Compared with the COG solution, it can further reduce the frame and increase the screen ratio.