According to an article in ETNews, Samsung has changed part of its production for the Galaxy Note 4 from using OCA (optically clear adhesives) to using OCR (optically clear resin). From the two names there seem to be only semantic differences, however OCA refers to a film based adhesive, while OCR refers to a liquid form and a completely different application process.
While OCA is the most used process, it does have some technical disadvantages in terms of optical performance. The article states that the superior optical performance of Apple’s smartphones comes also from the use of OCR bonding. On the other hand, OCR bonding is inferior in terms of yields and ultimately in terms of cost. The article sees that some of the users of OCR, such as Foxconn, have reverted back to OCA because of the higher cost issue.
The article says that some Chinese smartphone makers are also applying OCR bonding to achieve better performance and suggest that the Korean display makers will ultimately shift towards OCR driven by the performance requirements. This will require not only to secure the resin but also the necessary application equipment.
With thanks to Jon Peddie who first noticed the article and relayed it to us. (NH)
