To test whether 30 minutes is enough to warm up modern calibrated and uncalibrated off-the-shelf displays, the research team assessed six HP L1702 displays (Hewlett Packard, Palo Alto, CA) before and after calibration.
Measurements of minimum and maximum luminance were taken using a calibrated photometer at 21 separate intervals over an eight-hour period at preselected time periods. The researchers judged displays to be stabilized when luminance ratio recordings were within ± 17% at any point during the period.
The study team found that 97% of measurements took longer than the recommended 30-minute warm-up time. Stabilization time averaged 100 minutes for both uncalibrated and noncalibrated displays.
"My time study results are clear that the current recommended warm-up times are not adequate for sufficient warm-up periods for these specific secondary class displays," said presenter Joanna Lowe. "As these displays are commonly in use across clinical sites, the likelihood of insufficient [just-noticeable differences] visualized at the recommended warm-up time period could potentially reduce diagnostic efficacy."
