Corp Tech Pres

Slide2: 

New TFT displays have 300+ : 1 contrast ratios. Brightness has increased to 350+ nits. Other viewing improvements have been added. So there isn’t any reason to improve the display, right??? Display enhancements shouldn’t be required

High ambient / outdoor applications have unique requirements: 

High ambient / outdoor applications have unique requirements Outdoor applications require sunlight readability. Protective overlays are often used. Touch switches are common options. High Bright Backlights are popular options and necessary to more closely match surround illuminance, but do not solve contrast problems Outdoors is a harsh environment

High Ambient Applications and Markets: 

High Ambient Applications and Markets Automotive / GPS Gas Pump POS Outdoor Kiosk Kiosks / ATMs Avionics In-Vehicle Computers

What is a nit?: 

What is a nit? A nit is a unit of projected light energy from one candle, measured from its source,measured one meter away, measured over a one meter square area. A footlambert is the same light measured one foot away, over a one foot square area. 1 ft lambert is the same as 3.426 nits

Contrast ratios: two methods, two results: 

Contrast ratios: two methods, two results Intrinsic Contrast Ratio On the surface, the display, may read a 300:1 contrast ratio. This does not take into account ambient lighting. In addition, the light meter is measuring total flux regardless of angular distribution Extrinsic Contrast Ratio A reading from a distance, taking into account ambient light and reflections. A good extrinsic contrast ratio is 10 :1. Newsprint is about 1.3:1.

Brightness versus Contrast: 

Brightness versus Contrast The human eye perceives brightness The human eye “sees” contrast The eye can perceive approx. 100 levels of brightness; each level must be twice as bright as the other. The eye can “see” over 1 billion levels of contrast

Brightness versus Contrast corrected: 

Brightness versus Contrast corrected The human visual system includes both the eyes and complex information processing in the brain. This is called the “visual system”. The human eye “sees” brightness differences. We call these brightness differences contrast. The human visual system can “see” over 1 billion levels of contrast

Brightness versus Contrast: 

Brightness versus Contrast “Brightness” lightens or darkens the image. “Contrast” changes the distinction between the light and dark areas. The human eye eventually becomes saturated with brightness and becomes more responsive to contrast. Contrast ratio is much more significant than brightness in high ambient illumination environments. The human visual system amplifies the difference in contrast: lateral inhibition

Lateral Inhibition Test: 

Lateral Inhibition Test You should only see a monochrome gray bar

Lateral Inhibition Test: 

Lateral Inhibition Test Is the bar still “monochrome”?

Contrast Example: 

Contrast Example This is a test This is a test High contrast, easy to read Very low contrast but it is readable

Luminance vs. Illuminance: 

Luminance vs. Illuminance 1500 nits 1500 nits is read only on “white” Black level can go as high as 100-150 nits In a darkroom, this is only 15: 1 contrast ratio Light coming out of a display is luminance

Effects of llluminance: 

Effects of llluminance 1500 nits 10,000 ft Candles 5% reflection adds to the “white” level but also to the “black” level, lowering the contrast ratio, washing out the display 5% reflection Ambient light is “illuminance”

Formulas: 

Formulas = Contrast Ratio Reflection = 5% x # of surfaces x ambient light

Even with high bright backlights, contrast may be low: 

Even with high bright backlights, contrast may be low

Direct Bonding eliminates reflective loss and increases contrast: 

Direct Bonding eliminates reflective loss and increases contrast 5% 5% 5% Direct bonding eliminates the two internal points of reflection. With AR coatings on the front, overall reflections drops to less than 2% Reflection = 10K ftC x 2% R= 50 nits 1500*0.85 + 50 50 = 26 :1 Contrast 1500 nits

Touch Screen Issues: 

Touch Screen Issues Transmissivity is only one of the problems 1500 nits 1200 nits Resistive touch has 4 layer, two outer and two internal layers, each reflecting 5% each Additionally, the transmissivity is lowered by 20% This bring the contrast ratio to 1.5 : 1 1200*.85% + 2500 2500 = 1.4 : 1

Touch Screen Issues: 

Touch Screen Issues Transmissivity is only one of the problems 1200 nits Resistive touch has 4 layer, two outer and two internal layers, each reflecting 5% each Additionally, the transmissivity is lowered by 20% The contrast ratio to 1.68 : 1, an improvement, but not by much Optically enhanced touch screens can help 1200*.85% + 1500 1500 = 1.68 : 1 1500 nits

G-BOND LaminationBenefits: 

G-BOND Lamination Benefits G-BOND lamination eliminates two (or more) internal layers which cause reflection and thus “washout” of the display. G-BOND has the best reflection reduction of any commercially available technology. G-BOND is among the lowest cost processes for glass bond lamination Creates an environmental seal Reinforces the LCD cell, making it much more rugged.

Direct Bond Benefits: 

Direct Bond Benefits Low reflective loss means higher contrast in high bright environments Display are daylight readable at 500 nits, sunlight readable at 800 nits Backlight power can be lowered to reduce overall power draw and less heat production No air gap eliminates “greenhouse” effect heat rise. Solid bond will conduct heat out of the display Cooler displays will not “clear”or go isotropic as quickly. No air gap prevents moisture from forming under the window.

Silicone Direct Bond: 

Silicone Direct Bond Reworkable through production process Reworkable in post-production Low toxicity, environmentally friendly materials. Excellent UV resistance Excellent optical properties Excellent mechanical properties Low glass transition temperature

Clearview Display Offers…: 

Clearview Display Offers… Bonded Anti-reflective glass Diffused AR glass Chemically strengthened glass Infrared blocking glass Bonded touch screens- Should be optically enhanced EMI/RFI windows Film laminations