the benefits of led-lcd
DESCRIPTION
LED-LCD TVs have many benefits over Plasma TVs including Local dimming and less power consumption. Learn exactly what the differences are between LED-LCD, LCD and Plasma TVsTRANSCRIPT
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LED-LCD Tv Backlighting
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How Tv Has Evolved
1989
TV Type: CRT
Screen Size < 36”
# of TV per household = 1
Picture: SD
2009
TV Type: LCD (mostly)
Screen Size < 55”
# of TV per household ~ 2.5
Picture: HD
Dramatic increase in Household Power consumption due to larger display size & TV count per house
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LED-LCD TV Energy Consumption Leads To Innovation
CECCEC EUEU
Energy StarEnergy Star
Hard Limit on all Hard Limit on all LCDTV > 50” LCDTV > 50”
Led by Energy Star 5.0
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TV Power Consumption Levels
This requires dramatic improvement in Power/sq-inch with increasing LCDTV sizeThis requires dramatic improvement in Power/sq-inch with increasing LCDTV size
Dimming of LED backlit LCDTV TV can helpDimming of LED backlit LCDTV TV can help
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3 Types of Dimming of LED Backlit LCDTV:Local Dimming Vs Edge Dimming Vs Segment Edge
CostCost
Energy Energy SavingsSavings
Edge DimEdge Dim
Local Dim
Segment Dim
Traditionally Limited by Traditionally Limited by high cost of LED & Drivershigh cost of LED & Drivers
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Top Reasons For Local Dimming in LED TV
More Energy Efficient and Better Picture Quality Tops Consumer Wish List for “next” LCD TV purchase
Demand for additional capability such as 3D, Color reproduction etc
- Driven by better and localized LED control & switching speed.
Source: CEABase: Random National Sample of 1000 US Adults
89%
80%
73%
73%
66%
60%
51%
41%
More Energy Efficient
Better Picture Quality
Wireless connection ( to DVD, PVR etc.)
Thinner Shape
Larger Screen Size
Digital Photo Display Capability
Internet Connectivity
More elegant design
Helped by Helped by Local DimmingLocal Dimming
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Best HDTV (Top 3 Are Local Dimmed)
As of 2 weeks As of 2 weeks agoago
Local DimmingLocal Dimming
Local DimmingLocal Dimming
Local DimmingLocal Dimming
PlasmaPlasma
1st1st
2nd2nd
3rd3rd
4th4th
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Market success not only due to Picture Quality
Lessons from Plasma Tv
- Plasma had the Best Picture Quality & still failed to capture TV market share. Why ?
High Power Consumption Average Cost Poor Form Factor
Low Power Consumption Best Picture Quality Thin Form Factor Low Cost
Local dimming LEDTV needs all 4 to be successful
Market FailureMarket Failure
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Cost of LED’s Large Number of LEDs
Includes Bin-ing costs Cost of (too many) discrete Drivers
“Thermal Problem” due to Wasted power causes heat that limits the driving of many LED
channels from one chip Results in having too many driver ICs
= 44%
= 20%
Locally Dimmed LCDTV Difficulties
Source: Power Electronics TechnologySource: Power Electronics Technology
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Innovative Approach Solves the Thermal problem AND reduces cost
iWatt’s unique patent pending Adaptive Switch technology reduces wasted power by up to 60%
Minimizes the thermal problem
Enables driving of very high channel counts from Single IC
Single Chip saves BOM Cost
Wider Vf Bin reduces LED cost
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64 Channel Single Chip LED B/L Driver for LCDTV
Breakthrough Architecture Breakthrough Architecture enables driving of 64 Channelsenables driving of 64 Channels
Industry leading cost & power Industry leading cost & power savingssavings
Ideal for Local dimming and Ideal for Local dimming and segment based edge dimmingsegment based edge dimming
Supports External Boost or BuckSupports External Boost or Buck
75 mA LED current75 mA LED current
Efficiency > 90%, Overall Efficiency > 90%, Overall Matching < 2%Matching < 2%
First LED driver of its kind to drive 64 channel & upto 640 LEDs
iW7040iW7040
Available in Pre-Production quantities by June ‘10
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Benefits of iW7040 LED Driver
Upto 60% reduction in wasted power (compared to similar local dimming LED TV using generic drivers)
Typical Savings of about 2W ~ 4.5W per IC Helps meet the most aggressive Energy Star 5 standard
Significant BOM cost savings due to higher integration (compared to similar LED TV using 8/16 Ch drivers)
Typical savings of around $8-$10 Less component count, smaller pcb, fewer insertions 75% fewer drivers means fewer component failures
Significantly improving reliability and lowering warranty costs
LED Cost Savings Wider Vf bin-ning range saves LED cost
Better picture quality Better TV system matching & local dimming
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7040 Enables Local Dimming by making it cost effective while saving energy
CostCost
Energy SavingsEnergy Savings
Edge DimEdge Dim
Local Dim
Segment Dim
With 7040
With 7040
Energy Efficient LED Is Made Possible
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The perfect LED Backlight Driver ?
• Maximum possible BOM Savings
• Save $8-$10
• No More limitation on Channel Count
User Friendly Graphical Interface
• Solves Thermal Problem
• Save 2-4W per IC
• No More limitation on Vf diff
EASY Application Design
Technology
System
IC
Software
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Summary: Power Management Solutions
Unique Benefits
Core LED Backlight Technology
Digital PWM Control
Adaptive Switching
Adaptive LDO
iMPower
Platform solutions-- “ Converging LCD Display Power Chain “ family
Compelling Technology-- Maximum control for best image quality
Lowest Cost/Channel-- Highest integration
Power ManagementExcellence -- Efficiency, heat & power savings