Brightness Uniformity; White Color Coordinates - Hitachi 14LD7200 Service Manual

768 resolution
Resolution, for XGA, SVGA, VGA Text and VGA Graphics the conditions of 3.2 can be
met.
3.2.2 POSITION CONTROL RANGE
The picture position can be adjusted that a complete picture can be displayed centered
3.2.3 Max. BRIGHTNESS : PC Mode
340(MIN.), 400(Typ.) cd/m2
Test conditions:
3.2.4 MIN. BRIGHTNESS : PC Mode
< 100 cd/m2
Test conditions:
3.2.5 CONTRAST RATIO : PC Mode
The contrast ratio(CR) measured at center position (5) of the display for it should be better
than 210(MIN.), 400(Typ.).
and is calculated according to the following formula.
CR =

3.3 BRIGHTNESS UNIFORMITY

The brightness uniformity has to be better than 70% and is calculated according to
to the following formula:
△Y = [
With Y1 to Y5 as the brightness values with all pixels white at the 5 measurement positions

3.4 WHITE COLOR COORDINATES

The white color temperature should be app. (CIE1931, Normal : 9300 and 6500),A 3th
channel should be available, which can be defined by the user. The measurement position is
the center of the display(5) at brightness set to maximum and Contrast set to center. The
tolerance of the color coordinates should be less than ± 0.020
- center of display (5)
- video input (RGB) = 0.7Vpp
- brightness control is set to max.
- contrast control is set to max.
- center of display (5)
- video input (RGB) = 0.700V
- brightness control is set to min.
- contrast control is set to min..
Brightness of all pixels white
Brightness of all pixels black
Ymin
] X 100%
Ymax
26