Trade-offs between different stackups

• On-cell sensors save cost by reducing one layer, the sensor is on the color filter glass.
• Optical quality is a tradeoff when choosing film sensors
  
  • The transmissivity of Film is lesser than that of the glass
• Discrete glass sensors provide a high optical quality
• Direct bonding is more expensive, but has advantages over airgap.
  
  • Contrast is enhanced by suppressing the reflection & refraction of light at each interface
  • Adhesion area is increased and rigidity is improved
  • Higher manufacturing yield
• Glass cover lens is preferred when using discrete glass sensor.
• PMMA cover lens is less expensive than glass cover lens