LED driver enhances LCD TV picture quality, eliminates 3D ghosting

Featuring efficient power management and backlight control together with multiple dimming modes for 3D, scanning and zone dimming edge-lit LCD TVs, these devices drive up to 16 parallel strings of LEDs and provide comprehensive system and fault management to support high-performance backlight design. OEMs will also be able to choose from smaller form factor MCUs, such as tinyAVR devices, they can lower their system overhead.

Historically, TV OEMs have had to calculate the appropriate parameters to effectively illuminate a desired area in the backlight of a display. LED drivers would generate algorithms to set the appropriate string phase to optimise synchronisation of the backlight to the LCD panel. OEMs often had to perform additional calculations to adjust the string phrase to ensure that the backlight was properly synchronised within the frame refresh.

The MSL2164 and the MSL2166, with multiple pulse width modulation (PWM) modes – including forward, inverse, trailing and centre – reduce design complexity because the timing algorithms are integrated into the devices. This ensures that the backlight is illuminated at the most optimal moment, when all of the LCD pixels have settled.

“Next-generation TVs, particularly those with 3D displays, demand a different approach towards local dimming,” said Girish Ramesh, marketing manager of smart power products at Atmel Corporation. “The MSL2164 and the MSL2166, with their smart timing algorithms and programmable PWM modes, give OEMs who are developing LED edge-lit TVs a clear advantage in performance, design time and cost.”

The MSL2164 and MSL2166 drive external MOSFETs with high current accuracy and string matching. By offering the widest dimming resolution in Atmel”s LED driver product family, the devices increase the contrast ratio and reduce power consumption by at least 20% compared to other available solutions.

An on-chip EEPROM allows OEMs to pre-program key system parameters to allow multiple subframes and reduce overall system design complexity and cost. The LED drivers feature Efficiency Optimizers that adaptively control up to three DC-DC converters that power the LED strings, minimizing power while maintaining LED current accuracy.


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