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UST Screen Technology: ALR, CLR, PET Crystal & Fresnel

Understand what the screen surface is doing before comparing marketing labels.

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Independent analysis. Product claims below are attributed to the merchant; availability and terms can change.

NothingProjector Classic PET Crystal ALR screen promotional image supplied by the site owner
Promotional image supplied by the publisher. It shows an 84-inch label; the current fixed-frame product listing we reviewed advertises 100–150 inch options, so verify the exact size/variant on the merchant page.

Core concepts

How ALR screens work

Directional reflection, absorption and why the projector angle matters.

ALR vs CLR

How the terminology overlaps and what to evaluate beyond the acronym.

PET crystal vs Fresnel

Compare common UST optical structures without assuming one is universally superior.

Projector screen gain

Why lower or higher gain changes brightness distribution and viewing behavior.

Specs need context

Ambient-light rejection percentages, gain numbers and viewing-angle claims can be useful, but they are not a substitute for matching the screen to projector geometry and the room. A UST screen is designed to accept light arriving from a very steep angle and reduce competing light from other directions.