Same Pixel Pitch, Different Result: Test LED at Working Brightness

Two proposals specify the same pixel pitch and a high refresh rate. Both screens show a vivid demonstration video. Neither observation tells you whether a dark presentation background will remain smooth at the brightness the room actually needs.

In a discussion about low-brightness grayscale, an operator reported that changing to uncompressed media did not remove the banding. Another thread describes module differences appearing only at reduced brightness. Use these reported symptoms to select the diagnostic checks below.

Agree the operating condition before comparing screens

Use the intended ambient lighting, viewing positions, content and brightness preset. A software setting of 20% is not a measured luminance of 20% of a catalogue value. Record the setting and, when comparing different products, measure luminance with an appropriate instrument and documented method.

For a fair comparison, identify the exact panel, receiving card, processor, firmware, calibration state, colour settings, input format and warm-up condition. Keep the same test files and observation method. Change one variable at a time.

Locate the stage that changes the image

Compare a documented internal processor pattern with a known external source, while noting that internal patterns may bypass processing stages or use a different bit depth. If only the external path fails, investigate decoding, GPU output, range conversion, signal transport and input processing. If both fail, the downstream configuration or panel path deserves attention; that observation still does not identify a single faulty component.

Do not infer a 10-bit end-to-end path from a 10-bit source file. Confirm each device supports the requested bit depth at the actual resolution and frame rate. Resolume documents this dependency. Likewise, LED drive precision at low brightness is a distinct issue: Brompton describes panel- and timing-dependent extended bit depth for compatible equipment. Those capabilities cannot be assumed for every LED wall.

Camera-facing installations need a second acceptance track

Record camera model, sensor mode, frame rate, exposure time or shutter angle, lens, focus, distance and motion. Record processor reference, phase, panel configuration and working brightness. A quoted refresh rate alone is insufficient evidence.

First distinguish spatial patterns that respond to framing or focus from temporal bands that respond to exposure and timing. A 2026 discussion reports bands even with genlock connected. Check the full configuration rather than assuming the presence of a sync cable completes the test. Brompton’s ShutterSync documentation describes adjusting panel refresh to camera exposure on supported processors and panels, in conjunction with genlock. Test the actual camera configuration and use the instructions for the installed equipment.

Turn the demonstration into acceptance evidence

For each condition, record the file, preset, measured values where applicable, viewing position, observation, agreed criterion and result. Preserve source files and original camera recordings. Automatic exposure or compressed screenshots can hide or introduce differences.

The purchase brief must also define power, mounting, thermal limits, environmental boundaries, service access and redundancy. Treat these as separate requirements: excellent gradients do not qualify an enclosure for outdoor use, and a second signal input does not establish an end-to-end backup path.

The useful deliverable is an accepted operating preset with traceable evidence. Repeating the test after a module replacement or firmware change makes the initial comparison useful throughout the system’s life.

Technical sources

• Resolume: 10-bit output — input/output support depends on the complete mode
• Brompton: Extended Bit Depth — capability belongs to compatible hardware and settings
• Brompton: ShutterSync — processor-specific camera timing, genlock and panel-support requirements

About this guide: Use these project checks with acceptance limits agreed for the supplied configuration. VITREVIA supplies and integrates display systems directly from Shenzhen, China.

Download the editable test record (.txt)

Project checklist

Related product and project pages