AT Display Week, the electronic display samples on the exhibit floor look better every year: The TVs are bigger, brighter, more colorful, and have deeper blacks and more pixels. Displays for other applications are curved in every dimension and flexible. They last longer and are generally easier on the environment. Quite a few use exotic materials, most emit their own light, and some depend on ambient light, with the advantage of sunlight readability. They are meant to be hung on living room walls, destined for automobiles, or designed for devices we stick in our purses and pockets. Each one delights the eye, but all of them must be evaluatedsubjectively by visual inspection, and objectively with sophisticated optical measurement equipment.In the case of the former, test operators at a factory might visually compare the display under test to a display that's known to be good. Or, more likely, they will have samples of displays with artifacts that are at the limit of acceptability (that is, limit samples) with which they can accept or reject a particular sample. The operator can look for spatial and temporal artifacts (for instance, non-uniformities and flicker) and replace or repair displays that don't meet the manufacturer's standards. This type of evaluation has its place, but optical measurement done with well-controlled, calibrated instruments and good methodology is how display manufacturers maintain quality and deliver consistently good displays in the long term. This approach follows procedures that are grounded in optical science and human factors and reports results in a way that can be effectively used by display professionals and adapted in a straight-forward manner to be understood by the end-user.With this in mind, we'll take a look at important news about metrology and image quality that came out of Display Week 2019.