Europtec News Forum – Requirements of Touchscreen Glass

Written on August 8, 2017

 

This Issues Topic: Unique Requirements of Touchscreen Glass

Touchbar

 

1) Haptic “feel”:

  • Fingers need to “glide” over the glass and not “stick-slip”
  • Smooth glass has very high “stick-slip” properties; oleophobics are used to create smoother haptic properties
  • AR coatings have even worse “stick-slip” properties and need the oleophobic coating barrier to prevent AR damage
  • Critical that the haptic feel stays consistent over the life of the touchscreen and does not change with wear
  • Stylus touchscreens require structured surface for optimized user experience as users expect a “paper” like writing experience

 

2) Rugged Glass:

  • PCAP sensors require high sensitivity in all environments so glass is the best base material
  • Chemical strengthening is recommended for impact resistance
  • High rub resistance to touching, swiping and stylus writing
  • Both soda-lime and AlSi glass are successfully used in products
  • Additive coatings (AR, Spray AG) are less preferred due to lifetime wear and chemical resistance. Higher OEM liability!

 

3) Touch Screen Visual Clarity:

  • Great visibility to the LCD screen behind the touch sensor
  • Low fingerprint visibility on the touch screen surface
  • Control of reflected glare for ambient light
  • Low haze and high resolution of the cover glass
  • Optical bonding highly recommended

dirtytouch         dirtytouch2

 

Common Industry Compromises:

  • Glare is a real problem for touch screens, however, traditional AR coatings are not rugged enough to survive rubbing and abrasion.  The default solution has been to use smooth glass for durability.
  • Smooth glass touchscreens suffer from high glare
  • Smooth glass does not have the necessary haptics, therefore, oleophobic coatings have been used to create the smooth, silky feel
  • Oleophobic coatings are highly susceptible to abrasive wear and sunlight sensitive so they breakdown rapidly in outdoor environments
  • Oleophobic benefits are limited and haptic performance degrades over time
  • Ruggedized soda-lime or aluminosilicate glass is required for touch applications. Thin glass (<2mm) is typically chemically strengthened for impact and scratch resistance
  • Fingerprint resistance has been a continuing issue; oleophobics help to reduce the transfer of finger oils, but fingerprints persist
  • Glass with oleophobic coatings have about 4 ½% reflection and this helps to mask the fingerprint interference; if an AR coating is used (reflection of <0.5%R), then the interference from these prints become highly objectionable

IMG_3778   fingerprint2

 

Another Option for Touch Screen Glass:

  • Chemically etched Anti-glare (AG) glass can provide an ideal surface for touch screens
  • AG glass provides a smooth feel with no “stick-slip”
  • AG glass can create the feeling of writing on paper for stylus touchscreens
  • AG surfaces greatly reduces specular reflection which creates great sunlight readability for LCD displays
  • Structured and diffused reflection of surface masks the visibility of fingerprints
  • Ideal AG surfaces have features that can withstand abrasion and rub resistance
  • Additional coatings not required to improve haptic performance
  • AG glass can be chemically strengthened in final size
  • AG aluminosilicate glass is an option for even greater scratch resistance

 

EuropTec’s EagleEtch® AG Glass:

  • Industry leading low sparkle AG glass
  • Wide Range of Gloss units available; 35, 50, 70, 95, 110
  • 10 Gloss is available for touch or track pad applications
  • Rugged abrasion resistance
  • Class leading resolution, clarity and low haze at all gloss values
  • Soda lime and aluminosilicate glass availability
  • AG surface can be made on one side or both sides
  • Sizes available up to 36” x 60”
  • Chemically strengthened glass service provided
  • Glass fabrication and finishing options
  • Epoxy and UV cure silk screening available

matteglossy   resolutionex


 

We hope this article was helpful to your team. We will continue to bring you additional technical articles and tips throughout the year. If you would like to get more detailed information or discuss your particular program, please contact us at europtecusa@europtec.com or call our office at +1 (304) 624-7461.

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SSparts2

 

 

Europtec News Forum – Specifying Anti-Glare Glass

Written on April 18, 2017

 

This Issues Topic: What factors are critical when specifying AG glass for your application?

 

 matte_glossyexample

 

Typical complaints from loosely specified AG glass implementations:

  • It looks too “foggy or milky”
  • Similar gloss values from varying suppliers “look” entirely different
  • The transmitted image is not clear
  • The AG causes the display to “twinkle or sparkle”
  • Too much resolution loss with heavier etched surfaces (to reduce specular reflections)

 


Key factors to consider when specifying AG glass:

There are five criteria that are very important to the functional performance of the AG glass. They work in unison to achieve the optical “look” that your eyes perceive, therefore, the criteria all have to be reviewed and specified in order to achieve optimal performance and product consistency.

 

Gloss:

This is a “gross” dimension as each supplier’s AG surface topography is different. This means that if you measure one supplier’s AG as 60 Gloss and measure another supplier’s glass at 60 Gloss, the products may still look entirely different to your eyes. Gloss is a base metric that works well to control consistency of product from a specified supplier.

 

Haze:

Defined as the percentage of light which in passing through the glass deviates from the incident beam greater than 2.5 degrees on the average. Haze is a negative tradeoff effect of AG material and it is important to specify a max haze level for the product.
hazeex

 

Peak density:

Refers to the tiny “mountain ranges” on the surface of the etched glass. Typically measured as peaks per 100um linear distance across the surface. A very low density will result in a high sparkling AG glass with poor resolution and a very high density will only add haze without diffusing the specular reflection. A good initial target is to look for about 4 to 6 peaks per 100um.

Surface structure:
EagleEtch Gloss 70
surface_structureEE

 

Average surface roughness, Ra:

Here is a graph of Ra for our different EagleEtch gloss levels.

glossvsroughness_chart

If an AG glass has significantly different values for its surface roughness, at a given gloss number, then its optical performance will be very different from what you may have desired.

 

Distinctness of Image (DOI Resolution):

Measures sharpness of the transmitted image versus the same image that has not been transmitted through an AG diffuse surface at a defined distance.

doi_example

Scattering of light by micro-structured surfaces does not only reduce specular reflections, it also affects the distinctness (sharpness) of images shown on the display screen. It is of vital importance for the visual performance of a display to realize the reduction of reflections without sacrificing the resolution of the image. AG Glass with high transmitted DOI enables greater mechanical design flexibility and increases optical performance.

 

 

EagleEtch Anti-Glare Glass Solutions:

Europtec’s EagleEtch glass is mass produced and controlled to the five listed metrics. Our etched glass was designed from the ground up and manufactured especially for the electronic display industry as a high performance anti-glare solution that can be integrated into any display application.

 

We hope this article was helpful to your team. We will continue to bring you additional technical articles and tips throughout the year. If you would like to get more detailed information or discuss your particular program, anti-glare implementation recommendations or product examples please contact us at europtecusa@europtec.com or call our office at +1 (304) 624-7461.

 

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header_img_glass

Visit us at booth #J327 at the Touch Taiwan Exhibition, August 27-29, 2014 in Taipei

Written on August 7, 2014

Both our Europtec USA and Europtec Asia team will be at the booth all week. Come see our products and unique display glass solutions we can provide for all industries.

SID Display Week 2014 Recap

Written on July 30, 2014

Great show this year in beautiful San Diego, CA. There were a lot of interesting discussions during the show and the interest is growing in anti-glare glass specifically for the automotive and commercial display industry. We continue to work to provide our customers with the best anti-glare glass on the market and flexibility to customize our product for use in any display glass application.

See you all next year in San Jose for another great show.

Visit us at booth #715 at SID Display Week, May 21-23, 2013 – Vancouver

Written on May 9, 2013

Visit us at our booth #715 during the annual Display Week convention to learn more about our capabilities and new products. We’ll be showing various applications of our EagleEtch glass which is the best optically performing anti-glare display cover glass. If you would like to setup an appointment during the show please contact us.

SID Display Week 2012 Recap

Written on June 15, 2012

We were very excited to host a large number of interested visitors at our booth and demo the benefits of using EagleEtch anti-glare glass products. Our new EagleEtch Tough, anti-glare aluminosilicate, glass was a huge hit.

Thank you to everyone who stopped by our booth and we look forward to the new partnerships and project opportunities discussed.  If you didn’t get a chance to check out  our new EagleEtch Tough products at SID, stay tuned, as we’ll be rolling out more information on this great product soon. We look forward to seeing everyone next year in Vancouver at SID 2013!

Visit us at booth #431 at SID Display Week, June 5-7, 2012 – Boston Convention Center

Written on May 1, 2012

Visit us at our booth #431 during the annual Display Week convention to learn more about our capabilities and new products we have available that are “thinner, lighter, and stronger” including EagleEtch Tough (anti-glare aluminosilicate glass) and our expanded line of EagleEtch XS (thin anti-glare glass) products including one specially made for glass trackpads. If you would like to setup an appointment during the show please contact us.

Europtec Introduces EagleEtch® Tough, Acid Etched Anti-glare Aluminosilicate Glass

Written on January 6, 2012

The demand for “strong” aluminosilicate glass in a non-glossy alternative for ruggedized and portable displays inspired EuropTec USA Inc. to create its newest product, EagleEtch® Tough.

EagleEtch® Tough offers the best in anti-glare properties in a much stronger scratch resistant glass type. The ultra-strong anti-glare glass is ideal for devices such as cell phones, tablets, ruggedized displays, and touchscreens.

In the past designers were limited and had to choose to focus on either reducing glare with standard soda-lime glass or using a high glare aluminosilicate glass that was much more rugged. EagleEtch® Tough eliminates the tradeoffs by combining the aluminosilicate raw glass with EuropTec’s subtractive acid etching process, which creates a surface structure that disperses incident light, allowing the user to focus on the screen rather than the reflected images. This means that unlike coating or spray-on anti-glare solutions, EagleEtch® Tough is able to withstand all downstream processing and still retain the benefits of the aluminosilicate glass.

EagleEtch® Tough follows in the tradition of EagleEtch®, EagleEtch® XS and EagleEtch Plus™, which are top performing anti-glare glass products manufactured especially for the electronic display industry.

Source: Press Release EagleEtch Tough

For more information contact us.

Special Etched Glass for Trackpad Applications

Written on January 3, 2012

The demand for a smooth feeling, low friction etched glass has lead Europtec to the creation of a special EagleEtch® XS Gloss 10 product version. The glass is specially designed for trackpad applications in ultrabooks, automobiles and special surfaces where touch feeling and sensation is critical.

EagleEtch® XS Gloss 10 is perfect for single and multi-touch solutions. The glass utilizes EuropTec’s subtractive acid etching process to create a durable structured surface that will not wear over time like acrylic or coated solutions and can survive all downstream processing.

EagleEtch® XS Gloss 10 follows in the tradition of EagleEtch® and EagleEtch Plus™, which are top performing anti-glare glass products manufactured especially for the electronic display industry.

Source: Press Release EagleEtch XS Gloss 10

For more information contact us.

We had a great time in Los Angeles at SID 2011!

Written on May 30, 2011

Thank you to everyone who stopped by our booth, we hope you all enjoyed checking out our latest products. This year was especially exciting for us as we unveiled our thinnest and lightest glass yet, EagleEtch XS. If you didn’t get a chance to check it out at SID, stay tuned, we’ll be rolling out more information on this great product soon. We look forward to seeing everyone next year in Boston at SID 2012!