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  • Capacitive Touch
  • Lamination
  • Surface Treatment
  • Structure
  • PolyTouch™
  • Glass/Glass
  • OGS
  • TOL
  • G1F
 
The basic capacitive touch panel structure is made by two parts: touch sensor and cover lens. There are two types of touch sensors. First
we have the glass sensor which has advantages in optical performance, durability, and narrow border, then the film sensor which has
advantages in thinness, lightness and facilitates the(or eases) production.
 
There are two type of cover lens: glass and plastic.
Typical cover lens thickness varies from 0.55, 0.75, or 1.1 mm for mobile devices, up to 3 mm or even thicker for industrial applications.
The dielectric constant of the cover lens and its thickness have a direct impact on the sensitivity of the capacitive touch panels – a thinner
cover lens and/or a higher dielectric constant results in better performance. Plastic (PMMA) has a lower dielectric constant and must be
half the thickness of glass to achieve the same performance.
 
EDT develops various types of sensor and cover lens combination for the capacitive touch panels: Glass to Glass, Glass to film and One
Glass only. The followings are our available capacitive touch panel structures.
 
         

 

 
As the demand for advanced user interface continues to evolve, the EDT PolyTouch™ innovation in capacitive touch solution, is an
alternative to touch sensory design that is both easy to implement and highly reliable. Unlike traditional resistive touch panels, 
PolyTouch™ technology utilizes unique structural design that exclude the need for sensory film, allowing a much more durable
composition and wider operating environment. Elegant, yet convenient, the PolyTouch™ series is an excellent touch solution
complementary to visual medium for any design. Equipped with various pre-installed functions and commands, each PolyTouch™
panel can be easily integrated and made compatible with either existing or newly developed system for fast implementation and
development.  Standard PolyTouch™ design from 3.5" to 7" size offers single touch and multi touch alternatives.  Both may be
standardized or customized and be integrated as part of the LCD module. 
   
PolyTouch™ Key Features
 
1.Glass on glass structure
2.Outstanding performance
   - ITO pattern invisibility
   - High transparency (85% & above)
   - Robust structure
   - High reliability
   *Operation temp.: -20℃ ~ +70℃
   *Storage temp.: -30℃ ~ +80 ℃
3.Cost efficient
   - Cost saving on replacement of cover lens design
   - Better yield rate than conventional lamination processes
 
         
              

The Glass/Glass (G/G) type capacitive touch panel (CTP) has been used for glass cover lens laminated
with glass sensor
.

The cover glass is used to protect the sensor glass underneath, and the sensor glass is used to sense the touch points. The sensor glass is coated with two conductive layers of ITO: one for the x-axis, another for the y-axis. There are two types of G/G solutions: double-sided indium-tin oxide (DITO), patented by Apple, and single-sided ITO (SITO) that is the most popular used in the CTP industry.

             

The overall thickness of EDT’s G/G type CTP can be from 1.1 mm for portable device to 3.5 mm or even thicker for various industrial applications. Advantage for G/G type CTP is that the glass cover lens can be custom made by screen-printed on the rear surface, in-mold decorated (IMD), complex treatment with multiple holes and slots, rounded corners, even bent edges, and in most cases, chemically strengthen to enhance its resistance to external impact.

 

 

 
One Glass Solution(OGS):
 
First, applying a chemical strengthening process onto mother glass, followed by the application of blackmasking (BM1) and circuitry
layout. Once circuitry is completed, mother glass is then divided into individual size panels, and applied with edge-grinding treatment.
A second step of chemical strengthening process is then applied, followed by optional decoration printing or surface treatment.
 
 
Touch on Lens(TOL):
 
Individual panels are separated from the mother glass and undergone chemical strengthening individually. The glass is then entered
cover lens and blackmasking (BM) process, followed by circuitry application and at last any pattern decoration or surface treatment.
 
 
EDT’s G1F structure is optimized from G-G and G-F-F. It is composed of one glass sensor, which is made from cover glass and one
film sensor. G1F improves thickness and weight of G-G, and also the optical performance of G-F-F. 
 
A = Thickness of Glass Sensor = 0.7 ±0.05 mm
B = Thickness of Film Sensor = 0.225 ±0.1 mm
T = Total Thickness = 0.925mm (1.0mm max.)
Note: Typical mechanical   design profile of Glass-Film structure 
 
 
Mechanical
 
 
 
Strength
 
 
 
Transmittance
 
 

 

  • OCA
  • OCR
  • Optical Bonding
 
EDT Optically Clear CTP
 
OCA(Optically Clear Adhesive) optical bonding
Common thickness: 150um、175um、200um、250um、500um、800um
 
 
EDT Optically Clear CTP
 
OCR(Optically Clear Resin) optical bonding
 
 
What is "Optical Bonding”?
 
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 color 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 advantages

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.
 
Examples
(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.  
(2) For optical bonding(R2+3=0.2%) structure without AR, the total specular reflectance is 4.2%, the CR can be calculated below,
 
 
 
 
 

 

  • Anti-Glare
  • Anti-Reflection
  • Anti-Fingerprint

Anti-Glare (AG)

When surrounding glare makes display readability difficult, anti-glare (AG) coatings utilize diffusive properties to fragment the ambient light
off the surface, using the concept of constructive interference of light. Diffusion works by scattering specular reflections into a wide viewing
cone, making these undesirable reflected images and glare blurred to the eye.
 
AG coatings use either diffused particles or etching on the glass surface and can enhance viewing performance. EDT currently provides
one standard types of AG coating, both with superior glare reduction for glass cover lens.

 

         Anti-Reflection (AR)

Using the concept of destructive interference of light, anti-reflective (AR) coatings utilize stacking layers 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)

Anti-Fingerprint (AF) coating is using nano-scale material which has excellent water & oil repellency to make the glass surface having
smooth touch, and prevent glass surface from contamination such as smudging or staining, making the glass surface extra slippery
and easy to clean.

 

 

 
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