HP LD4730 47-inch Micro-Bezel Video Wall Display - Manual (Page 55)

5. Navigate to Clock Frequency under the Option 1 submenu of the OSD. Increase or decrease
the value to minimize any vertical bars or stripes visible on the screen background.
Figure 4-7 Adjust frequency
6. Navigate to Phase. Increase or decrease the value to minimize video flickering or blurring.
Figure 4-8 Adjust phase
NOTE: The frequency must be adjusted before the phase, since the phase setting is
dependent on the frequency setting.
7. If the monitor images become distorted, continue adjusting the values until the distortion
disappears. To restore the factory settings, select Yes from the Factory Reset menu in the on-
screen display (this will reset all other OSD choices as well). When you are satisfied, exit the
OSD menu.
8. Press the ESC key or any other key on the keyboard to exit the test pattern.
Tuning color
The HP DreamColor Display Calibration Solution (purchased separately) can be used to calibrate the
displays in a video wall to ensure that their output closely matches each other. This prevents visible
differences in the composite image due to variations in color temperature, luminance, or gamut (the
range of colors) among the displays. It can also be useful to calibrate displays that are not in a video
wall but which should match each other, as when they are in the same room.
The HP LD4730 and LD4730G displays contain an internal color management engine and calibration
processing hardware, allowing calibration without the use of an external computer; the colorimeter
contained in the HP DreamColor Display Calibration Solution is all that is required.
Calibration is performed on each display in a video wall and can be done before or after the wall is
assembled. It may be easier to calibrate the displays prior to wall assembly because the colorimeter
must be connected to the USB port on the back of the display. Since you might want to recalibrate a
video wall after it has been installed, HP recommends using scissor mounts or some other type that
allows you to move each display out from the wall and access the USB port. For a permanent wall
installation, a rack-mount USB extender facilitates access to the USB ports.
ENWW Tuning color 47