Doctors and medical professionals are able to receive real-time results for their patients and don’t have to remove their surgical gloves to give accurate feedback.

The increased transmissivity, clarity, and visibility allow access to crystal-clear feedback. Previous medical displays had extreme contrast ratios and items of concern, such as tumors, may have gone undetected. Increased clarity of the interface also clarifies the test results, due to high transmissivity levels.

Taking PCAP to the Next Level

Component testing and the increased demand for PCAP prove that the allglass construction of a PCAP touch panel is steps ahead of previous touch technologies. There are options available to enhance PCAP even more.

As shown in Fig. 2, the flat, glass surface of a PCAP allows for a zero-bezel look. For additional robustness, many applications require a coverplate bonded to the top layer. There are different optical adhesives available in the market, including double-sided adhesives and liquid bonding agents. Liquid agents, typically cured with a UV light source, eliminate air gaps and bubbles that may occur with other adhesives. The optical bonding is done with machinery that applies a uniform layer of adhesive and then cures it.

Optical bonding also increases visibility by eliminating reflective images and increasing sunlight readability. The bonding adhesive creates an additional layer of durability, by increasing and strengthening the glass, which also extends the lifespan of the device. The optical performance can be further enhanced by using the same liquid bonding agent to bond the touch panel to the TFT, eliminating another source of reflections and refractions (Fig. 3).

Current PCAP panels allow for more robust designs, longer lifespans, the ability to withstand dirt, debris, and harsh cleaners, and also enhance the look and feel of devices. Applications that benefit from PCAP range from Point of Sale, to white goods, to medical devices. With new PCAP-sensing technologies emerging daily, PCAP can only get better. Sizes currently range up to 20 in., but in the very near future even larger PCAP touch interfaces will become a part of daily life.

This article was written by David Nolte, Sr. VP of Engineering, and Tony Gray, Principal Engineer for Ocular LCD, Dallas, TX. For more information, visit