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Examples

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UV-Bonding Measurements

Analysis of UV cured Optical Bonds and Methods for Volume Testing

- New principles for high-speed testing -

How to measure improper optical bonds?

There are several „classical“ methods – but then you have destruction.

But there are some – trial – methods for NON destruction.

To name two of them:

- color dispersion across all viewing angles ... and a bit simpler
- 4-side spectral measurement ... beside other

All have the problem to be „integral“ judging the complete behaviour of thebonded display head – not the bond ONLY.

And on top: how to then select the UV-driven problems out of it?

→ But there is a selective method!

Examples for optical appearance of improper UV-bonding

Major root-cause of UV-bonding problems: Ongoing exchange of UV-sources for UV-bonding

Differences in severeness of UV bonding issues - 1

Selective analyzing optical bonds made by UV-resin

All samples shown are real products – failing at end-customer in field use analysed by our new method

WITHOUT any destruction or delamination of device
WITHOUT interference of integrated display
WITH very high sensitivity
VERY QUICK, time requirement for data aquisition  starting at approx. 500ms

Differences in severeness of UV bonding issues - 2

Selective analyzing optical bonds made by UV-resin

Samples from different customers using different kind of UV resins – selected for similar size/shape only to better compare

USEFULL for any size - so far used from below 1" to 86"
VERY selective - also for issuses beside UV-bonding problems
Can be used MICROSCOPIC or MACROSCOPIC

Very high confidence level of results

The detected critical pattern have been very detailed analysed by „classical“ methods using delamination, cryo technics (not to loose any VOCs), gas chromatography, mass spectrometer , TGA, FTIR-ATR and other

AND

Finally very well corelated to the computed results of our new quick and NON-destructive method.

So far we have proven our new method at more than 2000 tested units back from field.

How we do - some insights

Challenge:
Measuring optically clear structures give a quite small signal to noise ratio, so

it will be very hard to rank any signal for its amplitude
it will be very hard to find stable pattern

Solution:
We use the „Pattern-Approach“, which is fostered by powerful mathematical algorithms to help us.

Even if we sometimes also get very easy understandable RAW data like the upper picture, we normally need for „every shot“ powerful computing to dismantle the interesting information from the noise.

ONE shot delivers different information

Today we already sort and understand more than 10 ! dedicated „critical“ pattern

And every pattern is very selective for its own and very dedicated purpose

Some examples (highlighted in colors):

RED – we call „Placks“ - selective for UV-bonding issues
GREEN – we call „Spätzle“ (german type of noodle) - selective for polymerisation issues
BLUE – we call „Sandpaper“ - selective for surface activation/surface energy issues

Application pictures of improper optical bonding

Our approach to the market

we already offer such UV-bonding analysis as a service (beside lots of other technical services)
we seek for partners (licensees, measurement equipment companies,…)
for parties interested in IP and service we offer dedicated (Teams-)meetings and webinars. Please feel free to contact us.