What are OCA optical glue and LOCA optical glue used for LCD touch screen bonding?

Views: 327     Author: Reshine Display     Publish Time: 2023-09-18      Origin: Site

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What are OCA optical glue and LOCA optical glue used for LCD touch screen bonding?

The UV glue used for touch screen bonding is mainly OCA and LOCA.


1. Introduction to OCA optical glue

OCA optical glue is one of the important raw materials for touch screens. It is made of optical acrylic adhesive without a base material, and then a layer of release film is attached to the upper and lower bottom layers. It is a double-sided laminating tape without a base material. It is the best adhesive for touch screens. Its advantages are clarity, high light transmittance (total light transmittance >99%), high adhesion, high weather resistance, water resistance, high temperature resistance, UV resistance, controlled thickness, uniform spacing, and long-term use There will be no problems with yellowing, peeling or deterioration.


OCA categories

OCA optical adhesives are divided into two categories, one is resistive and the other is capacitive. Resistive optical adhesives can be divided into 50um and 25um according to different thicknesses. Capacitive optical adhesives are divided into 100uM and 175um. , 200um, 250uM.


OCA application

OCA optical adhesive can be used in different fields according to its thickness. Its main uses are: electronic paper, transparent device bonding, projection screen assembly, aerospace or military optical device assembly, display assembly, lens assembly, resistive touch screen G+F +F, F+F, capacitive touch screen, panel, ICON and plastic materials such as glass and polycarbonate. Special adhesive used for bonding transparent optical components (such as lenses, etc.). It is required to be colorless and transparent, with a light transmittance of over 90%, good bonding strength, curing at room or medium temperature, and small curing shrinkage. Silicone rubber, acrylic resin, unsaturated polyester, polyurethane, epoxy resin and other adhesives can be used to bond optical components. Some processing agents are usually added during preparation to improve its optical properties or reduce curing shrinkage. Suitable for various films and screens (acrylic, glass screen, touch screen, etc.) around the display of fixed mobile machines.


2. Introduction to LOCA optical glue

Liquid optical clear adhesive, also known as LOCA, whose English name is: Liquid Optical Clear Adhesive, is a special adhesive mainly used for bonding transparent optical components.


LOCA characters

The characteristics of LOCA are: colorless and transparent, with a light transmittance of more than 98%, good bonding strength, and can be cured under normal or medium temperature conditions. It also has the characteristics of small curing shrinkage and resistance to yellowing. Compared with traditional OCA tapes, LOCA has special advantages in certain application areas and can solve the limitations faced by OCA tapes.


Features of liquid optical glue LOCA

1. High light transmittance (full transmittance >99%)

2. The bonding strength is high and it is easy to fold and repair unqualified bonded parts.

3. High adhesion, high weather resistance, water resistance, high temperature resistance, and UV resistance. It will not cause yellowing, peeling, or deterioration of the product after long-term use.


LOCA application

Liquid optical adhesive LOCA can be used for bonding transparent optical materials, such as ITO film, PMMA, PC, PET, glass, electronic paper, projection screen assembly, display assembly, lens assembly, resistive touch screen G+F+F, F+ F. Bonding of capacitive touch screens, panels, ICON and other related electronic and optical materials. These clear, substrate-free, isotropic adhesives ensure accurate color and full display brightness and provide a durable, high-strength bond.


In terms of cost, generally speaking, OCA optical glue is cheaper than LOCA optical glue. The preparation process of LOCA optical glue is relatively complex and requires specialized equipment and processes, so the cost is relatively high. However, specific costs may vary based on factors such as supplier, specifications and purchase volume.


Reshine Display (HK) Technology Co., Limited, China's top touch screen manufacturer.We supply 2.4" to 32" projected capacitive touch panel, capacitive touch panel, TFT LCD with touch panel by OCA, LOCA, air bonding over 16 years worldwide. Contact us now:judy.zhang@reshine-display.com. For more visit:www.reshine-display.com.

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