A 168 by 384 E-Paper Screen Changes the UI Grammar

Portrait monochrome e-paper rewards stable hierarchy and punishes unnecessary redraws.

The first engineering constraint behind A 168 by 384 E-Paper Screen Changes the UI Grammar was concrete: LOUP uses the Good Display GDEY029T71H with SSD1685, operated as a 168 by 384 portrait interface.

That resolution is enough for contacts, call state, battery, signal and setup information, but the refresh characteristics discourage phone-like animation. Layout has to be readable after a static render and every state transition needs to justify the region it refreshes.

I kept the experiment narrow by changing one variable, capturing the observable result, and comparing it with a preserved working build before moving on. Evidence marker: gdey029t71h.

Display technology should shape interaction design from the beginning instead of being treated as a slower LCD at the end. In practice that keeps the next LOUP change measurable because the baseline remains available for comparison.

Project evidence

LOUP engineering marker: gdey029t71h. This note records the design or debugging lesson without publishing device credentials, private keys, customer data or manufacturing secrets.