Dimming; Analog Luminance Control; Table 6. Digital Luminance Control; Table 7. Analog Luminance Control - Planar ICEBrite EL640.200-SK Series User Manual

Dimming

There are two standard methods for dimming the EL640.200-SK display. To
perform analog dimming in either buffered or non-buffered mode, connect a
100 K
voltage or current mode D/A converter may be used to facilitate dimming by
sinking a maximum of 250 µA nominal (for maximum dimming) from LUMA to
GND on the input connector. Open circuit voltage is 5 V nominal.
To perform digital dimming in buffered mode, the internal scan frequency is
controlled via the LUM1 and LUM0 inputs. When these inputs are left open,
the display is scanned at 240 Hz—the maximum scan rate. With the
combination of the two inputs, LUM1 and LUM0, the following scan
frequencies are obtained:

Table 6. Digital Luminance Control.

Approx. Relative Luminance
LUM1
LUM0
Frame rate (Hz) *

Analog Luminance Control

Luminance control circuitry is provided to allow the user to adjust the
luminance from 5 to 100 percent of the maximum. Connecting a 100 K
variable resistor between LUMA and GND will give a brightness range from
approximately 5 to 100 percent of the full luminance value. Alternatively, an
external voltage or current mode D/A converter may be used to facilitate
dimming by sinking a maximum of 250 µA (for maximum dimming) from
LUMA to GND on the input connector.

Table 7. Analog Luminance Control.

Approx. Relative Luminance
Maximum (No resistor connected)
Maximum (100 K
Minimum (O
Open Circuit voltage
Sink Current
Brightness values are measured as a percentage of full On Luminance with the
external resistor disconnected.
12 EL640.200-SK Operations Manual (020-0348-00B)
variable resistor between LUMA and GND. Alternatively, an external
resistor connected)
resistor connected)
Max 75%
1 1
1 0
240 180
Dimming
100 % (Default)
5% maximum, 0% minimum
5V nominal
250 A nominal, Vin = 0V
50% 25%
0 0
1 0
120 60
100 %