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LED driver removes LCD TV flickering, 3D ghosting

Posted: 22 Feb 2012 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? LCD TV? 3D ghosting? flickering?

Atmel Corp. has unleashed a portfolio of LED drivers with integrated timing algorithms that the company said enhances LCD TV picture quality by eliminating 3D ghosting and flickering effects. The Atmel MSL2164 and MSL2166 are designed to deliver great viewing and video gaming experience via new 3D and 2D scrolling backlight TVs, described the company.

The LED drivers work with Atmel AVR MCUs including the Atmel tinyAVR, Atmel megaAVR and Atmel AVR XMEGA devices. The MCUs 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.

Featuring highest 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, noted Atmel. The devices allow high-end TV OEMs to deliver high screen resolution and greatly enhance picture quality using internal lighting timing algorithms that improve the backlight timing accuracy, with higher resolution, the company said. At the same time, since OEMs will be able to choose from smaller form factor MCUs, they can lower their system overhead.

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.

The devices drive external MOSFETs with high current accuracy and string matching. They offer the dimming resolution necessary to increase the contrast ratio and reduce power consumption by at least 20 percent compared to other available solutions, claimed Atmel. The LED drivers feature 12bit PWM string dimming that allows 4,096 gray scales, 8bit global intensity dimming, 12bit PWM string phrasing, 10bit DAC current control and 8bit adaptive power correction.

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, added Atmel.

Production volumes of the MSL2164 and the MSL2166 are available with prices at $5.95 for quantities of 1K.

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