LED driver enhances LCD TV picture quality, eliminates 3D ghosting
The LED drivers work seamlessly with Atmel AVR microcontrollers (MCUs), including the Atmel tinyAVR, Atmel megaAVR and Atmel AVR XMEGA devices. The microcontrollers process timing and dimming instructions, sending this data to the MSL2164 and MSL2166 devices. The AVR devices, along with firmware, provide a total solution that optimizes the entire backlight design, delivering superior performance compared to competitive solutions.
Featuring highly efficiency power management and backlight control along with multiple dimming modes for 3D, scanning and zone dimming edge-lit LCD TVs, the MSL2164 and MSL2166 devices drive up to 16 parallel strings of LEDs and offer comprehensive system and fault management to support high-performance backlight design. With this new driver family, high-end TV OEMs can deliver high screen resolution and enhance picture quality using internal lighting timing algorithms that improve the backlight timing accuracy, with higher resolution vs. other solutions on the market today. At the same time, OEMs can lower their system overhead since they will be able to choose from smaller form factor MCUs, such as tinyAVR devices.
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 optimize synchronization of the backlight to the LCD panel. Often, OEMs had to perform additional calculations to adjust the string phrase to ensure that the backlight was properly synchronized within the frame refresh. The MSL2164 and the MSL2166, with multiple pulse width modulation (PWM) modes—including forward, inverse, trailing and center—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. “Our newest LED drivers, 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 devices 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.
12-bit PWM string dimming, which allows 4,096 gray scales for an enhanced image 8-bit global intensity dimming 12-bit PWM string phrasing 10-bit digital-to-analog converter (DAC) current control, which increases dimming control in lower light conditions 8-bit adaptive power correction, which maximizes efficiency of up to 3 string power supplies.
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.
Production volumes of the MSL2164 and the MSL2166 are available now, with prices at $5.95 for quantities of 1K.
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