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Introduction to Touch Screen Lamination Process--JDA Display

2023-11-28

From the structure of the screen, we roughly divide the screen into three parts. From top to bottom are the protective glass, TP, and display screen, and these three parts need to be bonded. There are three types of lamination processes, including frame lamination, zero lamination and full lamination technology.


The First One is Frame Lamination

Frame lamination: which also known as glue fitting, is the most common type of fitting. Double-sided adhesive the four sides between touchscreen and display (low difficulty and cost). Since there is an air layer between the display and the touch screen bonded using double-sided tape, this air layer will cause the display effect to be compromised after light is refracted.


The Second one is Zero Lamination

Zero Lamination: The lamination method is between full lamination and frame lamination. It mainly fills the non-adhesive transparent medium between the TP and the display screen with a refractive index equivalent to that of glass. On the one hand, there is no gap between the glass and the display screen, which reduces diffuse reflection and improves the display effect; on the other hand, because it is non-sticky, it is easy to assemble and maintain.


The Third one is Full lamination technology

Full lamination technology: Seamless adhesion between the touchscreen and the display using glue or optical glue. Most likely taking the LOCA as the medium, lamination the CG,TP,LCM together in the form of seamless. Its core is glue materials for full lamination and equipment for full lamination (including process technology, etc.). Currently, the main laminating materials on the market are UV water glue and OCA film, as well as expensive imported OCR glue.

Fully Lamination can provide a better optical display effect and ultra-thin design. It also can eliminate the air between the screen to reduce the reflect light between panels and glass, so as to enhance the screen’s display effect, achieving the effect of sunlight readable. What’s more, we need to learn the Full lamination process classification:


1. OCA Glue: a special adhesive used for cementing transparent optical components (such as lenses, etc.). It is colorless and transparent, has a light transmittance of more than 90%, has good bonding strength, can be cured at room or medium temperature, and has small curing shrinkage. Features. Currently it is mainly suitable for fitting small-sized products. The advantages of this technical process are high production efficiency, uniform thickness, no glue overflow problem, and controllable bonding area. No corrosion issues and easy maintenance.


2. LOCA Glue: 
Liquid optically clear glue. English: liquid optical clear adhesive is a special adhesive mainly used for bonding transparent optical components. Colorless and transparent, with a light transmittance of over 98% and good bonding strength. It can be cured under normal or medium temperature conditions, and has the characteristics of small curing shrinkage and resistance to yellowing. Mainly suitable for large size fitting. The advantages of this technology are that it can bond curved or uneven surface materials, is not sensitive to ink thickness, is easy to rework, and has a lower cost than OCA.