Sunlight Optical Bonding

Without Optical Bonding  

Sunlight viewability of a display depends on the differences between "lumination" and "illumination" of the display.  The lumination of the display is its brightness.  A display's brightness, typically referred to as a Nit (Candela per meter/2) is the amount of light energy coming out of the display.  Illumination is the amount of ambient light shining onto a display.  The readability of a display is dependant on the amount of light that is being reflected off of the display.  

Light travels through a variety of transparent materials; such as air, glass, plastic, and even water.  These material's abilty to transmit light is measured by their "indices of refraction".  As light transfers from one material to another, such as air to glass, the differences the index of refraction will cause reflection.  In the case of an air-to-glass interface, the reflection will be slightly less than 5% of the ambient light.  All surfaces that have an index mismatch will reflect and the reflection is cumulative.  In the case of a standard glass or plastic window, there are three surfaces with an index mismatch which will create a total relfection of nearly 15% of the ambient light.  If the total reflection (in nits) is close to the displays brightness, the contrast of the display will be reduced to the point where the display's readabilty is reduced to unacceptable levels.

Optical Bonding from i-Tech is a solid, transparent bond which optically couples the front cover glass or touch screen directly to the face of the display.  This internal bond eliminates  reflection from the two internal layers.  The outer surface of the window is treated with anti-reflecting coatings which matches the front surface of the glass with the index of refraction of air.   This combination reduces the total reflection of the display and front cover glass to less than 2% of the ambient light.  A reduction of reflection of this level, all but eliminates reflective loss in most ambient lighting conditions.  With reductions of this level, displays with 300-500 nits of brightness will be viewable in daylight or indirect lighting conditions.  At 500-800 nits brightness, most displays will be completely sunlight viewable. 

Aside from the optical quality, Optical Bonding elminates the air-gap which prevents heat build-up from the "greenhouse" effect and prevents fogging from moisture or contamination from dirt or particles.   It also offers shock protection and other damage to the LCD itself.

What is Ruggedization Displays Optically Bonded?

Optical Bonding 1.1 mm or 3.0 mm AR glass standard lamination "OVER" the display bezel.

Display Size

2.5" - 8.4"                                                                              

10.4" - 12.1"                                                                 

15.1" - 18.1"                                                                

19.1" - 23.0"                                                            

24.0"-    37.0"

Lead-time is 3-4 weeks after the receipt of the materials.