How to choose touch screen LOCA water-based adhesive?
Date:2025-11-27
Regarding touch screen water-based adhesive, it usually refers to LOCA liquid optical adhesive, mainly used to fill the gap between the touch screen and the display screen. The following table summarizes the main characteristics and uses of LOCA water-based adhesive:
Feature classification | Specific instructions |
Basic Definition | LOCA (Liquid Optically Clear Adhesive)， Liquid optical transparent adhesive, which is a type of ultraviolet (UV) curing adhesive |
Core Features | -High transparency: ensuring the clarity and contrast of the screen display. -Filling ability: Liquid can fill the tiny gaps between screen components. -Yellowing resistance&durability: It has good yellowing resistance and can improve the impact resistance and durability of the screen. -Suitable for complex structures: especially suitable for fitting surfaces with curved or uneven surfaces. |
Main applications | -The touch screen and display screen of smartphones and tablets are closely integrated. -Fill the gaps between LCD panels and transparent protective layers (such as cover glass) |
Curing method | It needs to be cured by UV irradiation |
How to choose touch screen adhesive
When choosing touch screen adhesive, LOCA water-based adhesive is an important option, but it still needs to be considered based on the specific needs of the product:
In addition to LOCA water-based adhesive, there is also OCA optical tape: OCA is a solid-state optical transparent tape with high light transmittance and adhesion, which can form a uniform and bubble free adhesive layer. The key difference between OCA and LOCA lies in its form and process: OCA is a pre formed adhesive film suitable for high flatness, large-scale automated bonding; LOCA is a liquid that can better fill irregular gaps.
Pay attention to key parameters: When making choices, you need to focus on the following points:
Transmittance: It directly affects the display effect, and the higher the value, the better.
Viscosity: affects the fluidity and filling ability of the adhesive.
Curing conditions: such as UV intensity and time of LOCA adhesive.
Adhesive strength: Ensure a strong bond between different materials (glass, PET film, etc.).
Weather resistance and reliability: including high temperature and humidity resistance, aging resistance (yellowing resistance), etc.
Summary and Recommendations
If your product has a large size or if there are curved or uneven surfaces on the bonding surface, it is necessary to fill gaps to improve structural strength and display effect. LOCA water-based adhesive is usually a more suitable choice.
If you pursue more efficient production (such as automated bonding), with a very flat bonding surface, and want to avoid the operational difficulty and overflow risk of liquid glue, OCA optical tape can be given priority consideration.
The final decision recommendation is to consider the product size, structural design, production process, reliability requirements, and cost comprehensively. Before practical application, it is best to consult with a professional adhesive supplier and conduct testing.
I hope the above information can help you. If you could share more about your product type (such as smartphones, car displays, or other devices) and specific usage scenarios, perhaps I can provide further advice.
Touch screen：https://www.auo-lcd.com/products/touch/
TFT LCD:https://www.auo-lcd.com/products/auo-lcd-screen/
