We can not stress enough how important it is to take all of the necessary precautions when installing an optically-bonded flat panel display. Neglecting to take proper precautions can result in panel failures, including permanent damage to the LCD, pressure spots, delamination, cracking of the overlay and other components related to the build, and more.
Though it may seem to be a simple task, there are many installation mishaps that can lead to permanent damage of the LCD. This includes cracking of the overlay, delamination/fissure of the bond, hot/pressure spots or other damage to the internal display assembly. Therefore, optically-bonded screens must be handled in a dust-free environment, with open gloved hands and by the outside edges of the display frame only. This will ensure that pressure exceeding the limitations will not be applied directly to the bonded screen.
General Digital recommends the following techniques when integrating optically-bonded displays, as they help ensure the longevity of the bond:
Sequential or Random Installment of Necessary Hardware (e.g., “Star Pattern”)
This provides an even pressure and avoids any rocking of the screen which may cause torsional stress. Using co-planar surfaces when securing bonded products is imperative. DO NOT continue integration if the unit is rocking.
Be sure to torque the mounting hardware to the manufacturer’s specifications. Over-torquing may produce exaggerated pressure along the edges, thus leading to the formation of hot/pressure spots in the LCD.
Typically, an OEM frame provides an inadequate number of mounting points for achieving a tight seal for optical bonding. We strongly recommend the use of our specially-designed XO-Fraim, which increases the number of mounting points to the OEM enclosure, thus ensuring a liquid or EMI tight seal to the gasket.
Additionally, side mounting brackets with slotted holes allow the display to be properly adjusted once mounted to the bezel. In the event that hot/pressure spots are introduced, the slotted holes in the XO-Fraim allow adjustment of the bonded LCD assembly, which equalizes the pressure on all four edges and minimizes pressure.
Ultimately, it is the responsibility of the procurement party to develop procedures to handle, mount and pack the panels properly and to ensure that the procedures are followed to the letter.