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Bob Christensen, GMN
By Bob Christensen | Feb 19, 2016
Functional display testing

In our previous blog article, Optical characterization testing, we explored the capabilities of GMN’s Light Lab. Now we’re focusing on another area of display testing; the functional tests. During the planning stage of a user interface device, functional testing is crucial. GMN provides both automated and manual testing services to meet a wide range of program requirements.

GMN’s automated functional testers provide computerized inspection services. These testers are equipped with vision inspection to subpixel resolution along with electrical testing for thermistor resistance and touchscreen resistance and capacitance. To further ensure the functionality of a touchscreen, a 9-point touch test is used to assess touchscreen performance. Another service growing in popularity is component traceability. Component traceability is done for both the touchscreen and LCD by recording component serial numbers in the inspection record, and then each assembly is assigned a unique GMN serial number for traceability of the entire assembly. Automated testing necessitates a longer testing period compared to manual testing and is optimal for high volume production runs that require data collection.

Another option for evaluating device functionality is manual testing. These tests are typically measured on a pass or fail basis. Human visual inspection is used to detect display issues such as pixel defects, lint, and bubbles. Handheld touch probes are used for the touchscreen functionality test.

Learn more about GMN display testing in our blog article: Optical characterization testing

Bob Christensen, GMN
By Bob Christensen | Feb 18, 2016
GMN in-house optical characterization testing

One could argue that the display is the most important component of a user interface device as it is the piece that consumers interact with the most. To support our customers’ user interface device programs, GMN offers in-house display testing services including both optical characterization and functional display testing. As an important step in product development, testing is used during both planning and production stages as a quality control tool.

View-fests, a process during which people compare different display options, are still commonly used to select a display design. GMN has the technology to measure the chosen display stack-up with equipment in our Light Lab. Through optical characterization, we can quantify measurements and provide data to support the components of a display. This data can also be used as a target point for future user interface device programs.

Specialized display testing from GMN’s Light Lab gives customers the ability to measure the optical characteristics of a display. Testing is needed to verify whether the design meets program specifications by measuring yellowing caused by UV exposure, reflectivity of the surface, display contrast and readability, luminance, color uniformity, and response time. The Light Lab also allows our technical experts to quantify display performance under various conditions including multiple viewing angles, different light source locations, and testing a display while in different states of power.

By involving GMN early on in the project, our team can assist in component selection and provide design considerations for manufacturability. Read more about GMN’s display testing capabilities in our next blog article about functional testing here: Functional display testing

By Jim Badders | Feb 10, 2016

We are excited to announce the release of a new video showcasing GMN’s display characterization testing capabilities. In GMN’s Light Lab, where display testing occurs, our technical experts are able to measure the optical characteristics and functionality of displays. Click below for a behind-the-scenes look at our Light Lab and the range of testing services available for your display. You can learn more about GMN's testing capabilities here.