Automatic Dimming (Manual Offset); Controlled Luminance Mode; Figure 13. Luminance Levels: Automatic Dimming (Manual Offset) - Planar LC640.480.21-065 Operation Manual

Automatic Dimming (Manual Offset)

Lamp luminance varies depending on ambient light levels. An off-board light sensor is
used to determine the level. The user can adjust the luminance offset by varying the input
from 0 to 5 Vdc on pin 33 (DIM) of the video input connector (J1). See Figure 13 below.
Table 17. Automatic Dimming (Manual Offset) Specifications.
Description
DIM function
DIM voltage to offset %
SWI Setting

Figure 13. Luminance Levels: Automatic Dimming (Manual Offset).

Max.
Min.
0 600 1200
AMBIENT LIGHT LEVEL (lux)

Controlled Luminance Mode

This function compensates for the luminance degradation of the lamps over time and
constrains the maximum display luminance to approximately 700 cd/m
sensor that measures the lamp luminance inside the light box, the microcontroller adjusts
the lamp current to maintain constant luminance at the desired luminance level. For
example, if DIM = 2.5V (corresponding to a 50% luminance level) in analog dimming
mode, then the display luminance will be maintained at approximately 350 cd/m
controlled luminance mode is enabled when pin 32 (/CBM) on J1 is low.
Specification
0 Vdc = max. negative offset (display always at min. luminance)
+2.5 Vdc = no offset
+5 Vdc = max. positive offset (display always at max. luminance)
Linear relationship
Switch 1 = OFF, Switch 2 = ON
1800 2400
LC640.480.21-065 Operations Manual (OM610-00)
3000 3600 4200
2
. Using a light
2
. The
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