This is a post from the Jersey Shore Sootout which may give some insight on why Panasonic panels may exhibit a blue bias: but proper calibration should take care of it:
01-27-03 06:14 AM
ghibliss
Senior Member
Registered: Aug 1999
Location: New York, NY
Posts: 420
Brucer,
The reason that the plasma panels need to be "re-tuned" after 1,000 hours is due to the fact that the Blue phosphor wears at a faster rate than the Red and Green phosphors. This wear is supposed to be at a fairly linear rate but has shown to have a very measurable effect on the White Balance of the panels. The Panasonic glass has an assymetrical phosphor design which means that the Red and Green phosphors are the same size but the Blue phosphor is slightly larger to compensate for the higher rate of wear that it will undergo over a period of time.
Since the Blue is wearing faster this will make the image shift and become slightly Red. Once the panel has been calibrated the user can compensate for this eneven White Balance by simply adding a few clicks of Blue to the Integrator mode or User Custom White balance settings in the software and the color temperature will track accurately once again.
I have now measured and logged the results (done with a spectroradiometer) of a number of customers panels with data from new to over 2,000 hours of use. The rate of wear is consistent for a given model over the same time period and re-calibration is generally the same amount of offset from one panel to the next.
__________________
01-27-03 06:14 AM
ghibliss
Senior Member
Registered: Aug 1999
Location: New York, NY
Posts: 420
Brucer,
The reason that the plasma panels need to be "re-tuned" after 1,000 hours is due to the fact that the Blue phosphor wears at a faster rate than the Red and Green phosphors. This wear is supposed to be at a fairly linear rate but has shown to have a very measurable effect on the White Balance of the panels. The Panasonic glass has an assymetrical phosphor design which means that the Red and Green phosphors are the same size but the Blue phosphor is slightly larger to compensate for the higher rate of wear that it will undergo over a period of time.
Since the Blue is wearing faster this will make the image shift and become slightly Red. Once the panel has been calibrated the user can compensate for this eneven White Balance by simply adding a few clicks of Blue to the Integrator mode or User Custom White balance settings in the software and the color temperature will track accurately once again.
I have now measured and logged the results (done with a spectroradiometer) of a number of customers panels with data from new to over 2,000 hours of use. The rate of wear is consistent for a given model over the same time period and re-calibration is generally the same amount of offset from one panel to the next.
__________________
