The parallel arrangement of LED backlights allows the control IC to utilize
inexpensive low voltage CMOS processes as shown by the followingcircuit
diagram which requires two to six white LEDs (WLEDs) in parallel. In
many applications, LED backlights have been used in small and medium size
portable LCD displays.
The AAT3169 IC is capable of driving six LEDs for a total of 180mA from a 2.7V to 5.5V input. It drives the LEDs with a constant current programmed by a low-side current sink (high side current source also are available). But it can result in unacceptable channel-to-channel mismatch in large format LCD displays where a greater number of LEDs are required across a larger viewing area.
source: http://www.hqew.net/circuit-diagram/Drive-Two$2dSix-White-LEDs-%28WLEDs%29-in-Parallel-Circuit-Diagram_5522.html
The AAT3169 IC is capable of driving six LEDs for a total of 180mA from a 2.7V to 5.5V input. It drives the LEDs with a constant current programmed by a low-side current sink (high side current source also are available). But it can result in unacceptable channel-to-channel mismatch in large format LCD displays where a greater number of LEDs are required across a larger viewing area.
source: http://www.hqew.net/circuit-diagram/Drive-Two$2dSix-White-LEDs-%28WLEDs%29-in-Parallel-Circuit-Diagram_5522.html
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