New 16-channel LED backlight controller from ams improves TV picture quality and saves power
December 16 2015 - 9:00AM
Business Wire
AS3824 controller enables independent, flexible PWM control
of each of 16 LED channels for local dimming and true reproduction
of the darkest shades of black
ams AG (SIX: AMS), a leading provider of high performance
sensors and analog ICs, today introduced the AS3824, a 16-channel
LED TV backlight controller which performs local dimming of
sections of a display screen to provide both improved picture
quality and valuable power savings of up to 20-30%.
The new backlight controller is intended for use in the latest
high-definition (HD) and ultra high-definition (UHD, or ‘4K’)
televisions, as well as high dynamic range (HDR) monitors and
displays.
The AS3824 includes a fully flexible 12-bit PWM generator for
each of its 16 channels, to enable sections of a display screen to
be dimmed independently. Each PWM generator may be synchronized
with an external synchronization signal.
The 16-channel independent dimming capability means that the
backlight intensity of each section can be precisely controlled to
match the picture content of each successive frame on display. When
a section of the frame needs to be dark, the LEDs illuminating just
that section may be dimmed independently of the rest, enabling a TV
to reproduce faithfully even the blackest of blacks, and enhancing
the perceived picture quality. By contrast, conventional global
backlight controllers cannot prevent some light from leaking into
sections of the display screen that should be black, thus
reproducing black as grey.
The local dimming enabled by the AS3824 also provides for
additional system power savings compared to global backlight
controllers.
The AS3824 backlight controller features a precise internal
10-bit DAC, which provides accurate (±0.5%) global control of the
current through external MOSFETs or bipolar transistors. It
supports all LED backlight topologies, with no limit on the current
through or voltage across the LEDs.
The device also includes a supplementary 8-bit current-control
DAC for each of the 16 channels, which can be used to boost or
lower the current locally through the LEDs in certain frames,
thereby increasing dynamic contrast ratios. This enables the AS3824
to support HDR monitors and HDR TVs.
The AS3824 is backed by a comprehensive set of protection
functions, including thermal shutdown when the temperature exceeds
140°C, and open and short LED detection. The device may be
programmed via a serial peripheral interface and daisy-chained to
as many AS3824 devices as are needed in the application.
‘With the introduction of the AS3824, ams is the first
semiconductor manufacturer to provide an LED backlighting
controller that is ready to support the latest Dolby Vision™
standard for UHD displays, enabling display manufacturers to
achieve a stunning contrast between light and dark and the deepest
black rendition’, said Bernd Krafthoefer, Marketing Manager for
Power Management business line at ams.
The AS3824 is available for sampling now. Unit pricing is $1.25
in order quantities of 1,000.
A demonstration kit for the AS3824 is available on request. For
sample requests and for more technical information, please go to
www.ams.com/LED-backlight-controller/AS3824.
Download press picture and block diagram at
http://www.ams.com/eng/Press/Press-Releases/
View source
version on businesswire.com: http://www.businesswire.com/news/home/20151216005421/en/
amsPatricia MoosburgerMedia Relationsphone: +43 (0) 3136 500
31235press@ams.comwww.ams.com
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