Are you tired of using a keyboard and mouse to control your business’s computers? In the past, this was the only way to control a computer. Over the past decade, however, there’s been a growing demand for touchscreen monitors. These monitors live up to their namesake by supporting touch commands, allowing users to control the connected computer or device by tapping icons on the monitor. But if you’re thinking about buying one or more touchscreen monitors for your business, there are a few things you’ll need to consider.

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#1) Size

Touch displays

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For optimal damage resistance:

• The cover glass should be chemically-strengthened with a minimum magnitude and depth of layer (DOL) of the compressive stress as follows. In all cases, glasses should exhibit non-frangible behavior. Frangible behavior is when the glass breaks into a large number of small pieces when hit with sufficient force:

  • 0.55 mm: ≥ 700 MPa CS and > 35 microns DOL
  • 0.7 mm: ≥ 750 MPa CS and > 40 microns DOL
  • 1.0 mm: ≥ 750 MPa CS and > 45 microns DOL

• 4-point bend test performance (edge strength) recommendations:

  • 0.55 mm: Average peak stress = 600 MPa
  • 0.7 mm: Average peak stress = 620 MPa
  • 1.0 mm: Average peak stress = 620 MPa

• Abraded ring-on-ring test performance (surface strength) recommendations:

  • 0.55 mm: Average load-to-failure = 30 kgf
  • 0.7 mm: Average load-to-failure = 55 kgf
  • 1.0 mm: Average load-to-failure = 100 kgf

• The following general design guidance should apply to machined cover glass parts:

  #FeatureMeasureGuidance 1Outer cornerRadius> 1.0 mm 2Slot radiusRadius> 1.5 mm 3Slot widthWidth> 1.5 mm 4Min. hole diameterDiameter> 1.5 mm 5Hole-to-edge distanceDiameter> 4.0 mm 6Width of protrusionWidthWidth > Depth 7Width of the slotWidthWidth > Depth 8Inner radiusRadius> 1.0 mm  

  Note   Tests conducted using a standard 1mm glass.

• The indentation threshold as measured with a Vickers indenter should be ≥ 5* kgf.

• The Knoop scratch load to lateral cracks should be ≥ 4* N.

High-Quality Touch Experience Recommendations:

• Minimum dielectric constant is 7.0.
• The Young's Modulus of the glass should be 71.5±5 GPa.
• The coefficient of thermal expansion (CTE) should be 80±4 x 10⁻⁷ per degree C.
• Water absorption should meet Hydrolytic Resistance Class 2 or better.

High-Quality Viewing Experience Recommendations:

• Optical transmission as measured through 1.0 mm thick cover glass is >91% nominal transmission across the 390-760 nm (visible) wavelength spectrum, with variation not to exceed ±1%.

Cover glass for integrated touch applications

Integrated touch cover glass applications are glass covers that serve as a protective display cover and as a physical carrier or substrate for the touch sensing layer (ITO, etc.) itself. Integrated touch cover glass applications are also known as one-glass solutions (OGS). You should conduct all tests and measurements following the conditions outlined in Cover Glass Test and Measurements.

Optimal Damage Resistance Guidelines:

• The cover glass should be chemically-strengthened with a minimum magnitude and depth of layer (DOL) of the compressive stress (CS) as follows. In all cases, glasses should exhibit non-frangible behavior. Frangible behavior is when the glass breaks into a large number of small pieces when hit with sufficient force:

  • 0.55 mm: ≥ 500 MPa CS and > 25 microns DOL
  • 0.7 mm: ≥ 550 MPa CS and > 37microns DOL
  • 1.0 mm: ≥ 550 MPa CS and > 55 microns DOL

• 4-point bend test performance (edge strength) recommendations:

  • 0.55 mm: Average peak stress = 600 MPa, B10 > 450MPa
  • 0.7 mm: Average peak stress = 620 MPa, B10 > 500MPa
  • 1.0 mm: Average peak stress = 620 MPa B10 > 500MPa

• Abraded ring-on-ring test performance (surface strength) recommendations:

  • 0.55 mm: Average load-to-failure = 13 kgf
  • 0.7 mm: Average load-to-failure = 20 kgf
  • 1.0 mm: Average load-to-failure = 29 kgf

• Refer to the figure for the machined cover glass part for general design guidance on machined cover glass parts. Holes and/or slots are not recommended on cover glass used for integrated touch applications due to compromises in edge strength.

• The indentation threshold as measured with a Vickers indenter should be ≥ 5 kgf.

• The Knoop scratch load to lateral cracks should be ≥ 4 N.

High-Quality Touch Experience Guidelines:

• Minimum dielectric constant is 7.0.
• The Young's Modulus of the glass should be 71.5±5 GPa.
• The coefficient of thermal expansion (CTE) should be 80±4 x 10⁻⁷ per ºC.
• Water absorption should meet Hydrolytic Resistance Class 2 or better.

High-Quality Viewing Experience Guidelines:

• The recommended optical transmission as measured through 1.0 mm thick cover glass is >91% nominal transmission across the 390-760 nm (visible) wavelength spectrum, with variation not to exceed ±1%.

Cover glass tests and measurements

• Make all measurements on bare glass with no coatings, films, or other types of surface treatments applied.

• Conduct all tests in a controlled environment (23±2º C, 50±5% RH).

• 4-Point Bend

  Perform horizontal bending testing using 18mm loading spans, and 36mm support spans applying a nominal crosshead rate of 5mm/min. The preferred sample geometry is 44mmx60mm. Breaking stress is reported based on ASTM C158. Sample geometries beyond the preferred geometry may require consultation by Corning on span selection.

• Abraded Ring-on-Ring (AROR)

  Abrasion with 90 grit Silicon Carbide @ 5psi, 5 seconds, ¼" mask; retained strength measured through Ring on Ring, ½" load ring, 1" support ring. Nominal crosshead rate of 1.2mm/min. Center the abrasion on the glass sample and place it in the center of the loading ring for testing. Breaking load is reported. The preferred sample geometry is 50mmx50mm. You can use ASTM C1499 as a reference for some aspects of the ring on ring procedure.

• Indention

  A Vickers indenter makes a series of indents in a glass samples, stepping through a range of repeated loads and held at the maximum load for 10 seconds, samples are inspected to assess the load where >50% of the indents exhibit evidence of radial cracks after a fixed period of time once the indents have been created. Loading/unloading rates = 0.2mm/min.

• Scratch Threshold

  A Knoop indenter places a series of 10mm scratches in a sample. Repeated scratches are performed over a range of loads, samples are inspected to assess the load where >50% of the scratches exhibit evidence of lateral cracks after a fixed period once the scratches have been created.

Related topics

Human Input Devices Design Guide

Windows Hardware Compatibility Program

HID over I2C

Unattend settings (Windows 8.1)

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