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BD6088GUL
Technical Note
● The explanation of ALC (Auto Luminous Control)
LCD backlight current adjustment is possible in the basis of the data detected by external ambient light sensor.
? Extensive selection of the ambient light sensors (Photo Diode, Photo Transistor, Photo IC(linear/logarithm)) is
possible by building adjustment feature of Sensor bias, gain adjustment and offset adjustment.
? Ambient data is changed into ambient level by digital data processing, and it can be read through I 2 C I/F.
? Register setting can customize a conversion to LED current. (Initial value is pre-set.)
? Natural dimming of LED driver is possible with the adjustment of the current transition speed.
? ON/ off of the key back light can be controlled automatically by the brightness.
Usually ON / intermittent
Sensor Offset Correction
PWM enabling
PWM Polarity
switching
WPWMIN
SBIAS
SBIAS
Sensor Gain Correction
Slope Timer
LIN/LOG
Conversion
Mode Select
LED*
Sensor
SSENS
ADC
Data
Correction
Average
Logarithmic Conv.
Ambient Level
Current
Conversion
Slope
process
LCD
Backlight
VBAT
DC current setup
Main Group
setup
GC1
GC2
Gain
Control
2 value
decision
PWM
process
KBLT
??
Gain Control ON/OFF
Ambient Level
Threshold
Hysteresis
Mode Select
Slope Timer
PWM Cycle
Key
Backlight
: Effective also in ALC functional the case of not using it
(1) Auto Luminous Control ON/OFF
? ALC block can be independent setting ON/OFF.
? It can use only to measure the Ambient level.
Register : ALCEN
Register : MLEDEN
Register : MLEDMD
? Refer to under about the associate ALC mode and Main LED current.
ALCEN
0
0
0
1
1
1
MLEDEN
0
1
1
0
1
1
MLEDMD
x
0
1
x
0
1
Sensor I/F
OFF
( AMB(3:0)=0h )
ON
LED control
OFF
ON
OFF
ON
Mode
OFF
Non ALC
mode
ALC mode
Main LED
current
-
IMLED(6:0)
IU0(6:0) (*1)
-
IMLED(6:0)
ALC mode (*2)
(*1) At this mode, because Sensor I/F is OFF, AMB(3:0)=0h.
So, Main LED current is selected IU0(6:0).
(*2) At this mode, Main LED current is selected IU0(6:0)~IUF(6:0)
It becomes current value corresponding to each brightness.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
33/51
2011.04 - Rev.A
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