User Manual

Calibration frequency
The Advanced IPS panel in the display is quite stable, but the LEDs in all backlights dim gradually over time. As
a general rule, you can expect a modern LED panel to dim by approximately 1% of its peak luminance for
every 1000 hours of use. Because this display has both blue and red LEDs, the dierential dimming of these
LEDs can result in a slight color shift. For many uses, though, no color shift is perceived even after 2000 or
more hours between calibrations.
As the display has an integrated calibration instrument, you may decide to calibrate more frequently than you
might otherwise. The frequency of calibration for your facility should be determined as much by comfort level
as anything else. The display can be set to automatically recalibrate on a user-dened schedule, making this
recalibration easy to do on a regular basis.
Display warm-up from cold power on
The LEDs used in the display backlight require a period of stabilization before the display is calibrated. HP
recommends that the displays be allowed to warm up so that the backlight can stabilize. The display’s
internal timer is congured to warn you if you attempt to calibrate within 30 minutes of the display being
turned on. This warm up time was determined by making timed measurements of the display from cold
power on. White point, primaries, and secondaries were measured every minute using a Photo Research
PR-740 spectroradiometer. ColorChecker patterns were measured every ve minutes, as not all
measurements could be completed in one minute with the PR-740.
For your reference, the following table shows the display accuracy, expressed as ΔE 2000, at dierent warm-
up times from cold power on.
Warm-up time White point Primaries/secondaries ColorChecker patterns
15 minutes < 1.5 ΔE 2000 < 1.0 ΔE 2000 < 1.0 ΔE 2000
30 minutes < 1.0 ΔE 2000 < 0.5 ΔE 2000 < 0.5 ΔE 2000
45 minutes < 0.5 ΔE 2000 < 0.25 ΔE 2000 < 0.5 ΔE 2000
60 minutes < 0.25 ΔE 2000 < 0.25 ΔE 2000 < 0.25 ΔE 2000
The display can automatically warm itself up prior to the start of the day to ensure that it is ready for color-
critical work the moment the artist sits down at the desk. This option warms the display up for 30 minutes,
ensuring that display accuracy will be under 1.0 ΔE 2000.
To set the display to automatically warm up:
1. Press one of the front bezel buttons to display the button labels, and then press the Open Menu button
to open the OSD.
2. Open the Calibration menu.
3. Select Set warm up time.
IMPORTANT: You must set the internal clock to set a calibration schedule. To set the clock, go to
Management > Time and date settings.
4. Select Enable.
5. Select Set time work begins.
6. Set the time and the days of the week to begin display warm up.
7. Press the Exit button to close the OSD.
Preparing for calibration 59