The demand for liquid optical glue (LOCA) is rising. In order to improve the bonding yield of touch panels larger than 7 inches and reduce the overall mass production cost, Chen Hong, Shenghua and other touch module factories are expanding the use of liquid optical adhesives to improve the traditional optical tape (OCA) paste. At the right time, it is easy to cause warpage, uneven joints, and the inability to rework and introduce fully automated processes. The liquid optical adhesive's penetration rate in the large and medium-sized touch market is growing rapidly.
James Huang, technical manager of Henkel Asia Pacific, said that the market demand for liquid optical adhesives is rapidly heating up. The main driving force comes from the development of touch panels towards the application of large and medium-sized screens such as tablet devices and personal computers (PC). Optical tapes, which are more common in touch panels for small and medium-sized mobile phones, have become increasingly inadequate due to limitations in physical characteristics, thus driving the trend of materials conversion for touch modules.
Huang analyzed that the gap between the glue area and the glue-free area of ​​each section of the large and medium-sized touch panel's lamination process is enlarged. Strength, touch sensing performance; this is the most important advantage of liquid optical adhesive, which can effectively solve the shortcomings of optical tape in the application of large and medium-sized touch panels.
In addition, for panels and transparent conductive films with enlarged size and increased material costs, the increase in the damage rate of the bonding process will be the key to suppressing the yield. Once the traditional optical tape is attached, it cannot be reworked, and the poor flatness of the joint surface will weaken the panel strength, light transmittance and weather resistance; in contrast, the liquid optical adhesive can be re-attached before the pre-gelling step Together, it will give the touch module industry more flexibility in production, and help to increase the yield and control the bill of materials (BOM) cost.
The German service Henkel technical service engineer Chen Huangmin added that at this stage, the process of laminating touch panels of more than 7 inches has almost completely changed to liquid optical adhesive; related materials and equipment have also been equipped with low-cost 7-inch tablets and 13-15 inch touch The development trend of notebook computers and AIO computers with more than 20-inches (AIO) is constantly emerging; therefore, Henkel is working with touch module factories and bonding equipment manufacturers to develop a new generation of large and medium-sized touch panel bonding solutions. Attack the business opportunity with full force.
In terms of equipment, Henkel and its partners have locked in 10- to 27-inch panel specifications and designed special glue application machines and ultraviolet (UV) light curing equipment; at the same time, in response to the problem of liquid glue easily overflowing, it is planned to develop large-size panels Patented technology for setting up retaining walls in the glue area. Chen Huangmin emphasized that in the future, the industry will also have the opportunity to develop a hybrid solution that has the advantages of both liquid optical adhesive and optical tape, and further increase the production yield and product reliability of large and medium-sized touch panels.
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