Touch Screen Contrast Test A Lot Of Requirements For High-brightness Display

May 4, 2010 - PRLog -- Electronic display of the contrast test a lot of requirements for high-brightness display readability measurement

environment. This test measured activation or display "open" area and did not activate, or "close" the relationship between

the regions.http://www.global-e-world.com/Touch-Screen-LCD-Monitor/7-inch-Touch-Screen-LCD-Monitor.php
High brightness contrast is inherent in the display properties, relationship to the surrounding environment is

related to the display screen brightness and reflection. Display reflex increase contrast performance will be greatly

reduced. Light will be reflected in the interface, this interface the transfer of light from one media to another caused by

the refractive index changes in the media. Resistive touch screen has four main interfaces, which spread from the air each or

optical media or vice versa.http://www.global-e-world.com/Touch-Screen-LCD-Monitor/
Because resistive touch screen is a hard plastic coating and the solid substrate to create

flexible interface and many other materials reflecting the source of the optical material (glass or plastic) coating on the

film formed, so reflection problem will be exacerbated.
Formula 1 is the Fresnel reflection equation
  Fresnel equations can be used to better understand the cumulative effects of surface reflection. Is the incident light

reach all parts of the first surface interface, then the initial medium is air (n1 = 1.0) and the refractive medium is

acrylic hard coating (n2 = 1.5), http://www.global-e-world.com/Touch-Screen-LCD-Monitor/8-...
then the result is the first 4% of the surface reflectance. Film coating? Wave effects (for

example, the conductive layer within the touch screen) included in the equation, the reflection problem will be exacerbated.

COTS total light reflection more than 20%, this value will destroy the environment of high brightness almost all the screen

contrast. Standard resistive touch screen surface reflection summary Figure

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