Building a Display Optical Test Setup: Equipment, Room and Procedures
An optical test setup is not a purchase; it is a capability built around the decisions the product actually needs to make. Buying a…
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Technical blog category
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CDTech James — engineering notes on choosing, integrating and qualifying display modules.
CDTech James — engineering notes on choosing, integrating and qualifying display modules.
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278 articles in this category.
Thermal Design for Sealed Display Enclosures
A sealed display enclosure solves ingress, cleaning and condensation problems and creates a thermal one. Without ventilation there is no path for heat to…
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Haze, Gloss and Surface Treatment: Measuring Cover-Glass Optics
Two numbers describe most of what a front surface does to light: haze and gloss. They are related but not interchangeable, and they can…
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Active Versus Passive LCD Displays: What the Difference Means for a Design
"Active" and "passive" describe how a liquid-crystal display addresses its pixels, not how good it looks. The distinction matters because it explains why two…
Read the noteField Diagnostics and Telemetry for Deployed Displays
A display that fails in a cabinet 500 kilometres away costs far more than the same failure on a bench. The difference is not…
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RMA and 8D Field Failure Analysis for Display Modules
Much of what the RMA is trying to reconstruct could have been captured at goods-in: see what to test when LCDs arrive and how…
Read the noteMounting Design and Load Paths for Display Assemblies
Most display modules are specified carefully and then mounted casually. The result is a class of defects - uneven backlighting, patches of mura, cracked…
Read the noteMeasuring Brightness, Contrast and Uniformity on Display Modules
Most disagreements about display brightness are not disagreements about physics. They are disagreements about conditions. Two laboratories can measure the same module and report…
Read the noteConnector and Contact Reliability in Display Assemblies
Intermittent faults are the hardest failures to find, and a large share of them live in connectors. A display that flickers when the cabinet…
Read the noteMeasuring Sunlight Readability: Contrast Under Real Ambient Light
A quoted nits figure does not prove that a sunlight readable screen works outdoors. Readability is a ratio between the light the display emits…
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