1 / 53

CNT-FED Part I Yesterday and Today

CNT-FED Part I Yesterday and Today. Min Hee Cho , Changhwan Shin, Wookhyun Kwon. Roadmap. Roadmap. 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

asher
Download Presentation

CNT-FED Part I Yesterday and Today

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CNT-FED Part IYesterday and Today Min Hee Cho, Changhwan Shin, Wookhyun Kwon

  2. Roadmap Roadmap 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) Part III: Application & marketing strategy * Target application (HUD) * Marketing strategy * Business Plan

  3. Outline for CNT-FED Part I 1. 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

  4. Outline 1. 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

  5. 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 diamond Strength : more than 2 times of spider’s thread Ultra high current densities : 1010 A/cm2 (Cu : 107 A/cm2)

  6. Application

  7. Depending Champion in Flat Display : LCD LCD Who is Next? CRT

  8. Quick review for FED FED : Field Emission Display 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 !!

  9. Outline 1. 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

  10. 2. Technology for FED & CNT from CRT to FED : CRT * CRT operation Powered by an electron gun  Thermionic emission (Boiling" them off a metal filament)  Scanned across the screen * CRT advantage - high contrast levels - very fast response times  Now disappear… Because of Thickness & Power

  11. from CRT to FED : FED structure cones (Spindt tip) * 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

  12. Normal Bad Pixel Bad Pixel in LCD Computer Synthetic beauty

  13. Bad Pixel in LCD

  14. Pixel control in FED 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 ) Technical Advantage :  increase yield (reduce the pixel loss)

  15. FED history 1991 1997 2000 spindt type was researched CNT FED Micro tip Full color FED FED systems started 2003 2004 ~Now Prepare CNT FED mass production : But not yet CNT BLU -38” CNT FED TV

  16. Performance competition The performance should be satisfied to be a future FPD TV. Major requirement • High Contrast • Wide Viewing Angle • High Resolution • Color Gamut • Fast Response • Resolution •Energy Saving ★:Excellent ☆:Very Good ◎:Good ○:Intermediate

  17. Outline 1. 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

  18. Use the Current LCD technolgy : Color gamut &Uniformity Use the light source in FED : Brightness & Efficiency Back light 2.2 BLU (Back Light Unit) The advantage of LCD + FED

  19. Local Dimming

  20. LCD vs BLU CNT is used for an electron emitter in both CNT-FED and CNT-BLU with many common technologies. Fast motion Blinking BLU Dynamic BLU Natural color Local Dimming

  21. Outline 1. 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

  22. 2.3 CNT merit CNTs 1> Small tip radius : The efficiency of the field emitters 2> High aspect ratio 3> High conductivity Materials and Design 28 (2007)

  23. The technology for CNT emitter Paste emitter Directly grown emitter catalyst dot PECVD Uniform CNT length / Possibility for higher resolution FED Low cost / Large area

  24. Issues in CNT emitter

  25. Common issue Due to - Inter-pixel uniformity - Life time

  26. Outline 1. 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

  27. 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

  28. CNT-FED Part II New Technology for CNT-FED Min Hee Cho, Changhwan Shin, Wookhyun Kwon

  29. Outline 1. New approach for the current CNT-FED: AM (Active-Matrix) CNT-FED 2. Transparent CNT-FED for HUD: SWNT-SOG composite for transparent FED

  30. Outline 1. New approach for the current CNT-FED: AM (Active-Matrix) CNT-FED 2. Transparent CNT-FED for HUD: SWNT-SOG composite for transparent FED

  31. Current CNT-FED • 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

  32. Technical 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)

  33. Alternative technology: fabrication Other issues: 1) Difficulty to implement the ideal triode structure with CNT 2) Spacer; high accelerating voltage required.

  34. New approach for the current CNT-FED: AM(Active-Matrix)-CNT-FED • 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 AM-CNT FED panel view (top), and its cross-sectional view (bottom) AM-CNT FED panel view (top), and its cross-sectional view (bottom)

  35. Possibility of the AM-CNT FED 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 Low IOFF at higher VDS Saturation region > 150V; less σ(Iop) uniformity Luminescence vs. anode voltage at the TMG-CNT emitter Transfer (top) and output (bottom) characteristic of the series-connected a-Si TFT

  36. Outline 1. New approach for the current CNT-FED: AM (Active-Matrix) CNT-FED 2. Transparent CNT-FED for HUD: SWNT-SOG composite for transparent FED

  37. Transparent CNT-FED Tin-Oxide-coated glass substrate used to synthesize the SWNT Tin-oxide-coated glass The SWNT film was purified, by ethanol treatment, to increase the adhesion of SWNTs with the substrate. Cleaning ** Arc discharge method to synthesize SWNT 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. Flowchart of fabrication process for the transparent CNT-FET based on a composite of SWNT and SOG.

  38. Summary - AM-CNT-FED can overcome the current CNT-FED technical issues. - Transparent CNT-FED can be fabricated cheaply and demonstrated. Reference [1] ETRI annual research report [2] Nguyen V. Quy et al., “SWNT-SOG composite for transparent field emission device,” Journal of Crystal Growth, Sep. 2008.

  39. CNT-FED Part III Applications and Marketing Strategy Min Hee Cho, Changhwan Shin, Wookhyun Kwon

  40. Outline • Applications • CNTHead-up Display (HUD) • Marketing Strategy for CNT-HUD • Market Size • Target Customers • SWOT Analysis • Investment • Conclusion

  41. Target Application

  42. Older Head-Up Display • Military and Civilian Aircraft < Targeting> < Navigation for night landing> • Major technologies • Laser Hologram

  43. Head-Up Display Automobile • 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

  44. Drawbacks of Old Technologies • Laser Hologram • Dashboard Projection

  45. CNT-FED technology for HUD “The first HUDs, failed to wow the consumer as hoped.” “Solid-state electronics new to HUD have produced dramatic improvement” • Limited functionality • Lack of clarity • Insufficient brightness • More clarity • More color • Brighter display • CNT-FED technology can provide • Transparency • Higher brightness • Clarity • Functionality

  46. Advanced HUD in Airplane • 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

  47. HUD in Entire Front Windshield of Car • Telemetric Display can provide an intelligent driving experience! • Traffic information • Navigation • Video phone • Safety warning

  48. Market Size HUD Market to reach $400 million by 2012 EE 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.

  49. Competitors

  50. Target Customers Airplane Makers Automotive Component Suppliers

More Related