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CNT-FED Part ICNT-FED Part IYesterday and TodayYesterday and Today
Min Hee Cho, Changhwan Shin, Wookhyun Kwon
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RoadmapRoadmapRoadmapRoadmap
Part III: Application & marketing strategy * Target application (HUD) * Marketing strategy * Business Plan
Part I : Yesterday and Today * Display technology summary CRT LCD FED * Current CNT FED technology and limitation
Part II : New technology * AM (Active matrix) CNT-FED * Transparent CNT-FED for HUD (Head up display)
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Outline for CNT-FED Part I1. Introduction
- CNT & Application- Depending Champion : LCD- Quick review for FED
2. Technology for FED & CNT 2.1 FED development
- from CRT to FED- Pixel control in FED- FED history- Performance competition
2.2 BLU (Back Light Unit)- Local Dimming- LCD vs BLU
2.3 CNT merit- The technology for CNT emitter- Issues in CNT emitter
- Common issue 3.Summary
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Outline1. Introduction
- CNT & Application- Depending Champion : LCD- Quick review for FED
2. Technology for FED & CNT 2.1 FED development
- from CRT to FED- Pixel control in FED- FED history- Performance competition
2.2 BLU (Back Light Unit)- Local Dimming- LCD vs BLU
2.3 CNT merit- The technology for CNT emitter- Issues in CNT emitter
- Common issue 3.Summary
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1. Introduction - CNT -
Single-walled CNT Double-walled CNT Multiwalled CNT
Diameter : 1/100,000 of a hair (1-100nm)Thermal conductivity : 10 times of diamondStrength : more than 2 times of spider’s threadUltra high current densities : 1010 A/cm2 (Cu : 107 A/cm2)
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Application
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Depending Champion in Flat Display : LCD
LCD
CRTWho is Next?
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Quick review for FED
Why FED ! * low power (30~50% of LCD,PDP) * very high contrast level * light weight (compared to LCD) * very slim (compared to LCD) * be able to make up for loss pixel dream of display !!
FED : Field Emission Display
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Outline1. Introduction
- CNT & Application- Depending Champion : LCD- Quick review for FED
2. Technology for FED & CNT 2.1 FED development
- from CRT to FED- Pixel control in FED- FED history- Performance competition
2.2 BLU (Back Light Unit)- Local Dimming- LCD vs BLU
2.3 CNT merit- The technology for CNT emitter- Issues in CNT emitter
- Common issue 3.Summary
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2. Technology for FED & CNT
from CRT to FED : CRT
* CRT advantage - high contrast levels - very fast response times Now disappear…
Because of Thickness & Power
* CRT operation Powered by an electron gun Thermionic emission (Boiling" them off a metal filament) Scanned across the screen
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from CRT to FED : FED structure
* Main difference : Many electron guns : Sharp tip : Field emission Thermionic emission vs Field emission (FED)
* Emitter : field electron sources to provide electrons strike colored phosphor produce a color image.
* In order to maximize performance : Carbon Nanotube (CNT) technology
cones (Spindt tip)
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Normal
Bad Pixel
Bad Pixel in LCD
Computer Synthetic beauty
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Bad Pixel in LCD
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Pixel control in FED
Technical Advantage : increase yield (reduce the pixel loss)
So tiny and many tips :
in some pixels being inoperable find the dead emitters corrected by slightly increasing the pulse (make up for the loss )
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FED history1991
FED systems started
1997 2000
2003 2004
spindt type was researched
Micro tip Full color FED CNT FED
-38” CNT FED TV
~Now
CNT BLU Prepare CNT FED mass production: But not yet
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Performance competition
• High Contrast• Wide Viewing Angle• High Resolution• Color Gamut• Fast Response• Resolution• Energy Saving
The performance should be satisfied to be a future FPD TV.
Major requirement
ITEM FED LCD PDP
Brightness ☆ ☆ ☆
Contrast ★ ☆ ☆
Color gamut ★ ★ ★
Brightness Uniformity ☆ ☆ ★
Power Consumption ★ ◎ ○
Response time ★ ○ ☆
View angle ★ ○ ☆
Gray scale ☆ ☆ ☆
Resolution ☆ ★ ○
Weight ★ ★ ★
★ :Excellent☆:Very Good◎:Good○:Intermediate
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Outline1. Introduction
- CNT & Application- Depending Champion : LCD- Quick review for FED
2. Technology for FED & CNT 2.1 FED development
- from CRT to FED- Pixel control in FED- FED history- Performance competition
2.2 BLU (Back Light Unit)- Local Dimming- LCD vs BLU
2.3 CNT merit- The technology for CNT emitter- Issues in CNT emitter
- Common issue 3.Summary
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2.2 BLU (Back Light Unit)
The advantage of LCD + FED
Back light
Use the Current LCD technolgy: Color gamut &Uniformity
Use the light source in FED: Brightness & Efficiency
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Local Dimming
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LCD vs BLU
Fast motionBlinking BLUDynamic BLU
CNT is used for an electron emitter in both CNT-FED and CNT-BLUwith many common technologies.
Natural color
Local Dimming
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Outline1. Introduction
- CNT & Application- Depending Champion : LCD- Quick review for FED
2. Technology for FED & CNT 2.1 FED development
- from CRT to FED- Pixel control in FED- FED history- Performance competition
2.2 BLU (Back Light Unit)- Local Dimming- LCD vs BLU
2.3 CNT merit- The technology for CNT emitter- Issues in CNT emitter
- Common issue 3.Summary
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2.3 CNT meritCNTs1> Small tip radius : The efficiency of the field emitters2> High aspect ratio3> High conductivity
Materials and Design 28 (2007)
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The technology for CNT emitterPaste emitter
Directly grown emitter
Low cost / Large area
catalyst dot
PECVD
Uniform CNT length / Possibility for higher resolution FED
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Emitter type Issues Target Approach
Paste
emitter
Emitter length uniformity
> 70% (1 - σ/μ) Raw CNT control
Residual minimized Paste composition
Directly
grown emitter
(CVD)
Large area deposition
system development
> 40” Collaboration with
machine maker
Diameter decrease
> 5nm @ 450C *Catalyst control
*Precursor control
Issues in CNT emitter
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Common issue
Target value Technology
High voltage stability
10~15kV Charge drain structure
Lifetime 30,000hr *use rigid CNTs
*Operation condition optimization
Brightness efficiency
60~70 lm/W * Anode screen optimization
* Cathode emission fill factor improvement
* Operation condition optimization
Due to - Inter-pixel uniformity- Life time
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Outline1. Introduction
- CNT & Application- Depending Champion : LCD- Quick review for FED
2. Technology for FED & CNT 2.1 FED development
- from CRT to FED- Pixel control in FED- FED history- Performance competition
2.2 BLU (Back Light Unit)- Local Dimming- LCD vs BLU
2.3 CNT merit- The technology for CNT emitter- Issues in CNT emitter
- Common issue 3.Summary
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Summary for Part I
◆ CNT FED picture quality is quite comparable to conventional LCD or PDP device
◆ CNT Backlight have superior capacity to express high image quality such as high contrast
and low power consumption
◆ CNT is most promising material for FED
◆ There still remain some obstacles : High voltage stability , Lifetime , Uniform fabrication , Large area process
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CNT-FED Part IINew Technology for CNT-FED
Min Hee Cho, Changhwan Shin, Wookhyun Kwon
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OutlineOutline
1. New approach for the current CNT-FED:1. New approach for the current CNT-FED: AM (Active-Matrix) CNT-FEDAM (Active-Matrix) CNT-FED
2. Transparent CNT-FED for HUD:2. Transparent CNT-FED for HUD: SWNT-SOG composite for transparent FEDSWNT-SOG composite for transparent FED
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OutlineOutline
1. New approach for the current CNT-FED:1. New approach for the current CNT-FED: AM (Active-Matrix) CNT-FEDAM (Active-Matrix) CNT-FED
2. Transparent CNT-FED for HUD:2. Transparent CNT-FED for HUD: SWNT-SOG composite for transparent FEDSWNT-SOG composite for transparent FED
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Current CNT-FEDCurrent CNT-FED
1. Why CNT?
nano-size tip, high-aspect-ratio, high stability ideal field-emission material
2. Current CNT emitter structures
Spindt-type CNT emitter fabricated by paste method
Under-gate-type CNT emitter fabricated by paste method
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Technical IssuesTechnical Issues
#0: no high-efficient low-voltage phosphor
accelerating voltage > 7kV; spacer charge
#1: no ideal triode emitter structure
#2: hard to implement inter-pixel uniformity
#3: Lifetime is not guaranteed (due to heat)
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Alternative technology: fabricationAlternative technology: fabrication
Other issues: 1) Difficulty to implement the ideal triode structure with CNT
2) Spacer; high accelerating voltage required.
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New approach for the current CNT-New approach for the current CNT-FED:FED:
AM(Active-Matrix)-CNT-FEDAM(Active-Matrix)-CNT-FED
AM-CNT FED panel view (top), and its cross-sectional view (bottom)
AM-CNT FED panel view (top), and its cross-sectional view (bottom)
Amorphous-silicon TFT (a-Si TFT) used for the switching device in LCD is utilized to control the CNT emitters in the AM-CNT FED.- a-SI TFT integrated with the cathode-plate; Address TFT & Driver TFTs
- TMG; gating to induce electric-field emission and prevent anode’s electric-field, integrating e-beams
- Anode plate with R/G/B phosphor, and Spacers supporting vacuum-packed emitters
- Operating VDD only depends on TFT characteristics, due to signal inputs on G/S of the TFTs
Tapered Macro-Gate
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Possibility of the AM-CNT FEDPossibility of the AM-CNT FED
Luminescence vs. anode voltage at the TMG-CNT emitter
No high-efficient low-voltage phosphor Accelerating voltage (> 7kV) required.
Alternative: TMG can obtain the required accelerating voltage of the anode.
Emitted e-beams can be integrated at the anode’s phosphor by TMG
Prevent cross-talk
AM-CNT
PM-CNT
Transfer (top) and output (bottom) characteristic of the series-connected a-Si TFT
Low IOFF at higher VDS
Saturation region > 150V; less σ(Iop) uniformity
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OutlineOutline
1. New approach for the current CNT-FED:1. New approach for the current CNT-FED: AM (Active-Matrix) CNT-FEDAM (Active-Matrix) CNT-FED
2. Transparent CNT-FED for HUD:2. Transparent CNT-FED for HUD: SWNT-SOG composite for transparent FEDSWNT-SOG composite for transparent FED
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Transparent CNT-FEDTransparent CNT-FED
Flowchart of fabrication process for the transparent CNT-FET based on a composite of SWNT and SOG.
Tin-oxide-coated glass
** Arc discharge method to synthesize SWNT
CleaningCleaning
Tin-Oxide-coated glass substrate used to synthesize the SWNT
The SWNT film was purified, by ethanol treatment, to increase the adhesion of SWNTs with the substrate.
The SWNT film was oxidized, to burn out amorphous carbon and oxidize the metal catalyst.
The purified SWNT film spin coated with SOG solution, then heated to remove moisture and solvent.
The film was exposed out of SOG by etching the top surface of the composite film in diluted HF solution.
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SummarySummary
- AM-CNT-FED can overcome the current CNT-- AM-CNT-FED can overcome the current CNT-FED technical issues.FED technical issues.
- Transparent CNT-FED can be fabricated - Transparent CNT-FED can be fabricated cheaply and demonstrated.cheaply and demonstrated.
ReferenceReference[1] ETRI annual research report[1] ETRI annual research report
[2] Nguyen V. Quy et al., “SWNT-SOG composite for transparent field [2] Nguyen V. Quy et al., “SWNT-SOG composite for transparent field emission device,” Journal of Crystal Growth, Sep. 2008. emission device,” Journal of Crystal Growth, Sep. 2008.
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CNT-FED Part IIICNT-FED Part IIIApplications and Marketing StrategyApplications and Marketing Strategy
Min Hee Cho, Changhwan Shin, Wookhyun Kwon
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OutlineOutline
ApplicationsApplications
CNTCNT Head-up Display (HUD)Head-up Display (HUD)
Marketing Strategy for CNT-HUDMarketing Strategy for CNT-HUD
• Market SizeMarket Size
• Target CustomersTarget Customers
• SWOT AnalysisSWOT Analysis
• InvestmentInvestment
ConclusionConclusion
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Application
Flat Panel Display Back Light UnitHead-Up Display
(H.U.D.)
Market Size
• Largest single market
• Large • Niche
Risk• Highly competitive
• Competitive• Small market size
Competitor
• LCD• PDP
• CCFL• LED
• Laser hologram• LED projection
Requirement
•High quality image•High speed response
• Low cost• Brightness• Low power
• High transparency
Investment
Min. $100 million(Samsung: $840 million)
Min. $10 million(CMO: $19.4 million)
Min. $1 million
Target ApplicationTarget Application
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Older Head-Up DisplayOlder Head-Up Display
Major technologies Laser Hologram
Military and Civilian Aircraft
< Targeting> < Navigation for night landing>
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Head-Up DisplayHead-Up DisplayAutomobileAutomobile
HUD in BMW 7 series
Mounted on the dashboard Projecting information onto the windshield Available only for luxury cars
Major technologies TFT-LCD projection LED projection
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Drawbacks of Old TechnologiesDrawbacks of Old Technologies Laser Hologram
Dashboard Projection
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• Limited functionality
• Lack of clarity
• Insufficient brightness
“The first HUDs, failed to wow the consumer as hoped.”
“Solid-state electronics new to HUD have produced dramatic improvement”
• More clarity
• More color
• Brighter display
• CNT-FED technology can provide• Transparency• Higher brightness• Clarity• Functionality
CNT-FED technology for HUDCNT-FED technology for HUD
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• 200% lighter and smaller• Support TV like images• Enhance pilot comfort
– Increased head clearance– Increased volume of head motion box – Pilot’s head can’t obscure image
Advanced HUD in AirplaneAdvanced HUD in Airplane
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Telemetric Display can provide an intelligent driving experience!
•Traffic information•Navigation•Video phone•Safety warning
HUD in Entire Front Windshield of CarHUD in Entire Front Windshield of Car
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Market SizeMarket Size
HUD Market to reach $400 million by 2012EE Times (21/Jun/2007) A new research brief from ABI Research has predicted that head-up display (HUD) solutions that display key information in the driver's line of sight, reducing the need to look away from the road ahead, will comprise a Rs.1,634.67 crore ($400 million) market by 2012. The HUD solution addresses raised concerns related to assortment of applications in today's cars, from navigation to information and entertainment that pulls the driver's attention away from the basic task of driving.
Demand for automobile HUD is rapidly growing. The real market exceeds the expectation.
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CompetitorsCompetitors
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Target CustomersTarget Customers
Airplane MakersAutomotive Component
Suppliers
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S.W.O.T. AnalysisS.W.O.T. Analysis
Transparency Higher brightness CRT like images
WEAKNESS
Small market size Reliability and Lifetime Yield
AM-CNT technology
OPPORTUNITY
Growing market Few competitors High price market
• Airplane• Luxury car
THREAT
Old solution providers• Laser hologram• Projection
Major companyPatent protectionI.P. provider
STRENTH
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Development Plane (Phase I)Development Plane (Phase I)
Patents
Proto-type
Promotion
2nd Investment
from Buyers
1st Investment
(Seed Money)+ $ 1000K (1M)
10 patents x $30K = - $300K
- $ 600K
- $ 100K
> $ 20 M
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ConclusionConclusion
CNT-FED is promising technology for future display, CNT-FED is promising technology for future display,
but this has limitationsbut this has limitations
To overcome these limitation, we introduce AM-CNT-To overcome these limitation, we introduce AM-CNT-
FED.FED.
To get product differentiation, we introduce To get product differentiation, we introduce
transparent display.transparent display.
HUD application is good target market to avoid high HUD application is good target market to avoid high
risks at the begging stage.risks at the begging stage.
We are finding angels who invest seed money!We are finding angels who invest seed money!