3.2.1 CUT-OFF ALIGNMENT
Cut-off alignment is used to define the color co-ordinates for low luminance level. This
alignment has to be done for the following standards:
1. Insert a grey test pattern with 25IRE signal amplitude
2. Measure the color co-ordinates near the center of the screen
3. Adjust with “R_ Offset”, “G_ Offset” and “B_ Offset” to above color co-ordinates values.
3.2.2 White balance
This alignment has to be done for the following standards:
1. Insert a grey test pattern with 80IRE signal amplitude
2. Measure the color co-ordinates near the center of the screen.
3. Adjust with “R_ Gain”, “G_ Gain” and “B_ Gain” to the following color co-ordinates
values:
The default values have a close relation with panel brightness. After white balance
alignment, a picture performance check should be done: the brightest scales of 16-
scale grey pattern should be distinguishable in vibrant mode (max contrast), and the
light output at OOB( out of box ) use whole white signal (white 100 IRE ),it should
be more than 350nits.
Before white balance alignment, we must make sure White Balance Init had been
done.
The white balance values in normal of HDMI are the base of other value, the other
sources are the offset on Norma of HDMI, so we must adjust normal of HDMI first,
then other source should be adjusted in the end.
Since the White Point and Offset alignments are influencing each other, an
interactive process maybe needed to get both alignments to the required values.
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