The full lamination of touch screen and display is an important link in the manufacturing of electronic products, which directly affects the display effect, touch sensitivity and durability of the product.
The steps of optical lamination of touch screen mainly include the following:
- Preparation stage:
Clean up the working area to ensure that there is no dust and impurities.
Prepare the required tools and materials, such as optical adhesive (OCA adhesive or water adhesive LOCA), touch screen, display and so on.
- Positioning & Alignment:
Place the touch screen and display in the special laminating equipment to ensure that they are precisely aligned.
Check and adjust the position to ensure no offset or misalignment.
- Lamination:
Use optical adhesive (OCA adhesive or water-based LOCA) to bond the touch screen and display together.
Parameters such as temperature, humidity and pressure need to be controlled during the lamination process to ensure lamination quality.
- Curing:
After the lamination is complete, the touch screen is cured and defoamed to make it tightly bonded to the display.
The curing time and temperature depends on the type of optical adhesive used and the manufacturer's requirements.
- Inspection and adjustment:
Test the laminated touch screen, including display effect and touch sensitivity.
If necessary, fine adjustments are made to ensure product quality.
Adhesive lamination and full lamination are the two main ways of laminating touch panels, and they differ significantly in a number of ways:
LOCA/OCR: Uses water glue (LOCA) as an adhesive to bond the touchscreen to the display. Water glue has high fluidity and can fill the tiny gap between the touch screen and the display, which is suitable for large-size or curved screen lamination.
Full Lamination: Optical adhesives (such as OCA adhesive) are used to completely bond the touchscreen to the display in a seamless manner. Full lamination technology can eliminate the air layer between the touch screen and the display, and improve the display effect and touch sensitivity.
LOCA/OCR lamination:
Advantages: suitable for lamination of large-size or curved screens; insensitive to ink thickness, easy to rework.
Disadvantages: relatively high cost, relatively complex process, need to accurately control the fluidity of the water glue and curing time; there may be problems such as overflow or bubbles.
Full lamination(OCA):
Advantages: excellent display effect, high touch sensitivity; reduce reflection and light loss to enhance the visual experience; enhance the structural strength of the screen.
Disadvantages: complex process; once damaged, the entire screen needs to be replaced.
Application Scenario:
OCR lamination: more suitable for large-size or curved screen products with certain requirements on cost.
Full lamination: more suitable for high-end electronic products with high requirements for display effect and touch sensitivity, such as smart phones and tablet PCs.
In summary, there are significant differences between water glue lamination and full lamination in terms of lamination methods, advantages and disadvantages, and application scenarios. When choosing the lamination method, it is necessary to make a comprehensive consideration according to the specific needs of the product and the budget.