R9001440/9
GRAPHICS
Uniformity Adjustments
Date:10/02/2000
6300
9
Uniformity Correction Adjustments
Uniformity Adjustment
Software Validity
List of projectors where this adjustment can be used.
Type
Art. number
BG6300 TCR+ (DLC)
Soft 1.02 and higher
R900144X
BR6300 TCR+ (DLC)
R900155X
BG6400 TCR+ (DLC)
BR6400 TCR+ (DLC)
R900176X
Reason For Uniformity
Correction
Color non-uniformities on a LCD projector can have two fundamentally different origins:
- the optical components and
- the LCDs.
An optical non-uniformity is present in the white as well as in the grey as in black and
can be caused by :
- poorly matched mirrors
- vignetting
- birefringence effects in the field lenses, etc
A non-uniformity caused by the LCD becomes more visible in the darker grey and
black levels. It is caused by the fact that the LCD transmission curve is not equal for
the whole LCD area. This can be a result of thickness variations or temperature
variations on the LCD which mainly cause a horizontal shift of the transmission curve.
In this case the effect will be most pronounced for the steepest part of the transmission
curve, this is the mid grey levels.
Other effects, like the stress on the glass induced by the drivers, or the variation of the
average incident angle of the light in different areas of the LCD, have a more complex
influence on the transmission curve, and therefore they are more difficult to
compensate.
With the current compensation program we can compensate the horizontal shift of
the transmission curves on different areas of the screen, so that the first order effect
of thickness and temperature variations can be compensated. As a result the
compensation will give the best results for the grey levels, but will have a very small
effect on the full (projector) white and on the black (there is some effect on e.g. the
6500K white because in that case green is already reduced).
The uniformity compensation can be modified independently on 17x13 points on the
screen. Because it is not feasible to adjust these points one by one, the program
contains an automatic adjustment in which 16 or 25 points are measured and adjusted
with the aid a color meter, and the other points are interpolated.
Program version 1.02
Preparation
The Uniformity Compensation Program requires
- A PC (486, or higher) with 2 COMM ports and DOS.
- The UNI.EXE program.
- A color meter: LMT (C1210 or higher) , Thoma (TMF6 or TMF6 II) or a Minolta
CS1000 color meter.
Program version
