display characterization

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By Jim Badders | Jun 12, 2014
GMN in-house light lab

GM Nameplate attended the Society of Information Display’s (SID) Display Week in San Diego this month. At our booth, we displayed our latest technology and product samples including front panel integration, cover glass decoration, projected-capacitive touch technology, and more. In addition to exhibiting at the show, GMN presented at the Exhibitors’ Forum on display characterization and front panel integration constructions.

At the Exhibitors’ Forum, GMN Front Panel Integration Manager, Jim Badders, presented on the impact different integration solutions can have on displays’ key optical properties, and how this data can be used to offer quantifiable comparisons over results from a traditional view fest study. GMN’s light lab is equipped to measure luminosity, contrast, and reflectance. These readings can be used to determine sunlight readability and overall display clarity.

In our research we characterized the optical readings of four different front panel integration assemblies (all using the same display and touchscreen): liquid optically clear adhesive (LOCA), LOCA with anti-reflection/anti-glare (AR/AG) film, air gap construction with adhesive gasket, and air gap construction with AR/AG film. Our team used the large-source specular reflection (SR) measure method per Section 11.7.3 of Information Display Measurement Standard Version 1.03, June 1, 2012.

The results?

The LOCA construction (without AR/AG film) far outperformed the air gap construction (without AR/AG film). The LOCA construction had a specular reflectance of .067, while the air gap construction was nearly double with a specular reflectance of .13255. In contrast, the air gap construction with AR/AG film didn’t perform much better, offering a specular reflectance result of .1223, which is an eight percent improvement over the basic air gap construction. 

The research provides insight on what construction best suits the environment/application of a display. While the air gap display has a higher reflectance rating than the LOCA construction, depending on environment and use, the optical advantages of LOCA may not be needed for its application, or can be offset enough with an AR/AG film. Overall, the study also serves as an excellent example of how utilizing display characterization readings can offer a more accurate comparison of different display constructions.