When sourcing a P20 (20mm pixel pitch) display, the most critical factor is the Transparency Rate, which should ideally be between 65% and 80% to ensure glass visibility is maintained. Buyers must also verify the Brightness levels, typically requiring ≥5000 nits for outdoor-facing window displays to combat direct sunlight, or 1000-1500 nits for indoor environments. Additionally, check the Refresh Rate (≥1920Hz or 3840Hz) to ensure flicker-free performance for camera filming and high-quality video playback.