Landmark Technology
LM130A-12C318 P.3
Landmark Technology 172 Component Drive, San Jose, CA 95131 (408) 434-9302 Fax: (408) 434-0954 08/2002
LCD Module Optical Performances
The typical screen luminance and contrast ratio for the LM130A-12C318 sunlight readable LCD module are shown in
the figures below:
The
LCD
screen
luminance
is
measured with the LCD in the “Off”
state (i.e. the pixels are not energized).
This is the “White” state that provides
the maximum luminance. Very often,
this “Off” state is slightyly brighter
than the “White” color displayed on the
screen when the LCD is turned on. This
result may be caused by the LCD
controller card or the video signal
driving the display. When the LCD is
properly
driven,
the
difference
between the luminance of the “Off”
state and the “White” color should be
less than 10%.
The inherent contrast ratio (CR) of the
LCD is the luminance ratio between the
“White” and the “Black” states
measured in a dark room. In outdoor
environments, the contrast ratio of the
display drops significantly due to the
reflections and glare caused by the
ambient illumination at the front
surface of the LCD and other layers,
such as a touch screen or a protective
window.