LCD DISPLAY ENHANCEMENTS

For more information click to Tru Vue

Tru-Vue display enhancements details as shown. For their new AR Haptic feature specifications not yet available but few bullet points as below.

1. Inorganic coating
2. Will not degrade with UV exposure (Organic coatings will degrade significantly with UV exposure)
3. Does not have as high of a water contact angle as organic fluorine based coatings.
4. Transfer of the skin oils and lipids will still occur (as it does on all organic fluorine based coatings) but the surface coating is very dense and easy to clean
5. Vista AR Haptic surface is smooth to the touch, without the “stick-slip” associated with standard AR coatings.
6. This coating will be a much more economical coating compared to other organic based coatings.

Vista AR™ Glass & Acrylic Anti-Reflective Coatings

The important things to consider in the design are High Brightness Environment, Heat Load, Vandal Resistance, Large Format, Durability, Touch Technology and Haptics for Touch Screens.

Enhancement Options:

• Air Gapped Glass or Plastic Front Cover Plate
• Bonded Glass or Plastic Front Cover Plate

Glass or Plastic Options:

• No Surface Treatment
• Anti-glare (AG) on one or both sides
• Anti-Reflection (AR) on one or both sides
• AR combined with AG
• Tempered
• Chemically Strengthened
• Laminated Safety Glass

AG Surface Treatment

1. Each surface of the AG plate still contributes ~4.25% R,
2. The rough AG surface is measured in “Gloss Units” The lower the gloss number, the rougher the surface
3. Lower gloss numbers can be used as the cover plate is moved closer to the image plane
4. The higher the gloss number the clearer the transmitted image becomes but there will be more of a specular reflection bounced back to your eye.
5. The higher the gloss level the more “sparkle” (twinkling small rainbows similar to moiré) will appear in transmission of your image.
6. Each manufacturers AG material behaves significantly differently even with the same gloss.
7. AG surfaces will offer good haptics for touch devices.  Careful consideration and understanding of tradeoffs need to be reviewed before an AG solution can be employed.

AR Surface Treatment 

1. Each surface of the AR plate contributes <0.3 %R, therefore, this approach reduces reflection to only ~4.75 %R (LCD contributes the most).
2. In a bright environment this approach would have very good clarity/visibility.
3. Care must be taken to select rugged AR’s verses delicate AR’s that would have poor environmental durability.
4. The small residual reflection may have a hue (color); most people prefer a soft violet/blue hue.

AR+AG Surface Treatment

1. Each surface of the AR+AG plate will only contribute <0.3%R,
2. The AG surface roughness is measured in micrometers and the AR thickness is measured  in nanometers  (1000 times  thinner)  It will  not “fill  in” the AG surface
3. All of the AG trade-offs are still valid even with an AR applied to the surface
4. Careful consideration and understanding of tradeoffs need to be reviewed before an AR+AG solution can be employed
5. If the parameters are carefully optimized this combination could offer excellent view-ability,   however, it is best suited for laminated options.

Glass Enhancements:

Chemical Strengthening

• Soda lime glass can yield a depth of penetration (DOP) of ~12um
• Alumina Silicate (Gorilla, Dragon Trail) can yield a DOP of ~50um

Heat tempering can be achieved on glass that is thicker than 3mm

• Care must be taken during the tempering cycle as warping, waviness, and pits can be introduced to the glass.
• Typically glass is tempered before anti-reflection coatings are applied

Glass can also be laminated to another piece of glass to make “safety” glass

• This approach keeps the broken shards of glass together and provides a tough vandal resistant window.
• AR coatings are applied to the outer surfaces before lamination