Capacitive Touch Panel (CTP)
With our specialty and expertise in display manufacturing, EDT started technology and process development for capacitive touch since 2007. From the conception of the sandwich type STN display, EDT launched PolyTech with two-piece glass structure (Glass with X-sensor + Glass with Y-sensor). Later in 2009, EDT introduced single side multiple layer structure, cover glass + glass with X and Y sensor. Due to growing demand for portable devices, slimmer single glass sensor solution was also introduced in development and production phases in 2010. The first launch of OGS (One Glass Solution) was in the following year 2011, manufactured by Sheet Glass process through secondary strengthen process. Then in 2012, EDT started the development TOL (Touch on Lens) with chip glass process so the structure is even more robust.
In order to develop these different technologies, EDT invest and focus a lot on IP development and now have more than 100 patents, of which 60% are for performance improvement while 40% are related to process development.
With extensive use of capacitive touch technology on smartphone, people are becoming familiar and used to its unique natural and intuitive characteristics. This is also affecting many other non-consumer products thus lead to innovative change in man-machine interface. For instance, multi-touch has the functions of tapping, switching, scrolling with one finger, gesture functions like zooming and rotating with two fingers, single finger with gesture and multi-point touch.
Its unique features make capacitive touch technology rugged and reliable, and gradually replace functions of traditional key switch and resistive type touch. It is the trend to integrate Multi-touch function into all kinds of product applications and development of projective CTP has been the mainstream in recent years. CTP is making it part of everyones daily life including other applications such as industrial control, medical, home automation, equipment and automotive etc.
Optical bonding is the process of laminating cover glass or touchscreens to the LCD cell. It is a process that applies a layer of transparent material such as OCA (Optically Clear Adhesive) or OCR (Optically Clear Resin) between the layers to completely fill the air gap.
The adhesive is completely transparent, the structure and colour of the adhesive will not transform through the use of time. Any display in an outdoor environment or high ambient light conditions can be improved with our matured technology and experience.
EDT provides optical bonding solutions to a wide variety of applications like handheld device for outdoor use, navigation systems, industrial, medical displays, and ATM equipment, for clear visibility under sunlight or in bright environment.
Optical bonding has some the following advantages,
(1) Enhanced sunlight readability (~5–10 times, depending on application).
(2) Increased impact resistance (~3–8 times, depending on the bonded cover glass).
(3) High shock and vibration tolerance.
(4) Very low reflectance for touch screens in desired applications.
(5) Greatly enhanced life by protecting the display materials from the humidity.
(6) High-quality optical bonding of performance-enhancing auxiliary components, such as AR, AG, AR/AG/hard coat/anti-smudge and heater glasses, touch screens, and UV, EMI, and sunlight filters.
(1) For air gap structure with AR(R1=0.5%), the total specular reflectance is 8.5%, the CR can be calculated below, and it should be larger than the structure without AR.
Using the concept of destructive interference of light, anti-reflective (AR) coatings utilize film structure over the glass surfaces that vastly
improve the efficiency of the optical performance by increasing transmission, enhancing contrast, and eliminating ghost images.
1. The transmission rate could reach up to 92% for single side one layer AR coating and 94% for double side two layers AR coating.
2. AR coating is vulnerable against finger prints, therefore extra layer of AF costing is always required.
Anti-Fingerprint (AF) coating is using nano-scale material which has excellent water & oil repellency to make the glass surface have a smooth touch, and prevent the glass surface from contamination such as smudging or staining, making the glass surface extra slippery and easy to clean.
Abrasion test conditions:
Load:1KgW @ 2cmx2cm , Steel Wood #0000
Speed : 50 Cycle/minutes , Times:1,000 Cycle
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