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EN 142
9.
Q528.1E LA
9.8
Ambient Light
In this chassis, LED AmbiLight units are introduced as the
successor of CCFL AmbiLight units. The system that is used is
called "LUMILED".
The units are completely aligned in factory and are a "Black
Box" for Service. When defective, they must be replaced
entirely. Refer to the Spare Parts List for the correct order
number.
The AmbiLight units are addressed by I
all lamp units is "6A". To address each unit separately,
selection lines are needed to distinguish between the boards.
Control is done by the SSB. Refer to figure "Ambient Light block
diagram" for details.
Second AmbiLight Unit
Sel = low/high
I 2 C + supply + 1 selection line
7pin
I 2 C + 2 selection lines
SUPPLY
TV520 SSB
(= I 2 C AmbiLightmaster)
Figure 9-20 Ambient Light block diagram
To address a specific unit, the selection line has to be "low".
In case of 2-sided AmbiLight, 6 data bytes are used to address
the units, 3 bytes for each lamp unit. They are driven by Pulse
Width Modulation (PWM). Refer to figure "Lamp unit
addressing" for details.
6 data bytes
Lamp unit A
Received by
first AmbiLight module
2 selection lines connected
to Ground
Figure 9-21 Lamp unit addressing
The driver current is different for the "basic colours" (R, G and
B) of each LED package. The "red" and "blue" LED's of each
package need a driver current of 150 mA, the "green" LED
need a driver current of 200 mA. Refer to figure "Ambient Light
module driving" for details. Each unit need a 12 V supply to
drive the LED's.
Circuit Descriptions, Abbreviation List, and IC Data Sheets
2
2
C. The I
C-address for
First
AmbiLight Unit
Sel = low/low
7pin
Supply
4pin
5pin
H_16770_139.eps
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Time
Lamp unit A
Received by
Second AmbiLight module
1 selection line connected
to Ground
H_16770_140.eps
Selection
lines
I²C
Figure 9-22 Ambient Light module driving
The configuration shown in figure "Ambient Light module
driving" is implemented two times per module.
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One LED package
150mA
Constant current
driver ic
200mA
Constant current
driver ic
150mA
Constant current
driver ic
PWM out
+12V
H_16770_141.eps
280307
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