For OLED screens, UV adhesive serves as a buffering agent preventing internal screen fractures due to stress.
For LCD screens, hot melt adhesive prevents the backlight from affecting the imaging of the front-facing camera.
OLED screens achieve self-illumination, eliminating the need for a backlight source, thus making them thinner. However, they are less rigid compared to LCD screens. After assembly with the phone frame, OLED screens are more susceptible to cracking from external impact and internal stress. To mitigate this risk, reinforcement sealing is applied along the edges to provide shock absorption and buffering.
For LCD screens, the polarizer and backlight module may leave gaps after bonding, allowing light from the backlight module to affect the imaging of the camera through these gaps. Therefore, sealing adhesive dispensing is necessary to block light and prevent interference with the camera imaging.
Process Characteristic
Display/Screen dispensing can be categorized into two types: edge sealing for OLED screens and edge sealing for LCD screens.
The precision requirements for dispensing locations are extremely high, demanding advanced control capabilities from the equipment. Traditional three-axis dispensing machines are no longer sufficient to meet the process requirements. Additional A-axis flipping and C-axis rotation actions are needed in conjunction with the XYZ axes to achieve increasingly complex screen dispensing processes. Axxon offers the AM300Q & AM500N five-axis coordinated dispensing machines, which boast powerful control capabilities and precise positioning accuracy, perfectly meeting various screen dispensing process requirements.
These machines possess robust spatial dispensing trajectory capabilities. During product positioning, the CCD captures the outline contour automatically calculates the product's center position and corrects compensation amounts for each motion axis. The dispensing control system then moves the dispense pump with simple and intelligent spatial trajectory for accurate fluid positioning.
High precision dispensing accuracy is crucial for fluid placement. Bondlines are typically very narrow and variations in bead width or positioning can create errors.
