OFET’s in rollable displays                                                     Fred Touwslager                           ...
Field Effect Transistor (a.k.a. TFT)                   A 3-terminal device in which the current between 2 of the          ...
Field effect transistors: layouts                                      bottom contact                         top contact ...
(Rollable) Active Matrix display        Active matrix display is a grid of pixels, with a switch connected        to each ...
(Rollable) Active Matrix display                               Data  Selection   pulseThemadag Organic and Printed Electro...
Mobile market: More powerful smaller devices                                                       Device Size decreasing ...
Main technology choices                                                                Typical dimensions:                ...
Substrate       • Chemical stability       • Thermal stability       • Surface quality       • Stiffness                  ...
SubstrateThemadag Organic and Printed Electronics November 10th 2011        17     Substrate handling         ƒ   Free sta...
Matrix stack           Semi-conductor:           ƒ   poly-Si: vacuum deposition at T  600°C           ƒ   amorphous Si: va...
Benchmarking different printing technologies      Printing                       Feature                  Layer thickness ...
Frontplane    Electrophoretic display (EPD) effect:    Black and white particles with opposite charge in a clear liquid.Th...
AM backplane layout                          Pixel electrode                                                              ...
Thinnest, most flexible display in the World                                                                   Plastic sub...
Brief history – Philips Research highlights                                   1995 First logic gates                      ...
Summary                                        Polymer Vision offers a robust, flexible and                               ...
Upcoming SlideShare
Loading in...5
×

Fred Touwslager - Polymer Vision

594

Published on

Published in: Business, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
594
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Fred Touwslager - Polymer Vision"

  1. 1. OFET’s in rollable displays Fred Touwslager Technology R&D managerconfidential Outline ƒ Introduction: ƒ Organic Field Effect Transistor ƒ Active matrix display ƒ Why rollable displays? ƒ Main technology choices ƒ SummaryThemadag Organic and Printed Electronics November 10th 2011 2
  2. 2. Field Effect Transistor (a.k.a. TFT) A 3-terminal device in which the current between 2 of the terminals is determined by the voltage on the third.Themadag Organic and Printed Electronics November 10th 2011 3 Field effect transistor: basic physics Transfer characteristics Drain voltage = -1V * - Drain current (A) Accumulation Variable Subthreshold Vt Depletion * Vt = onset of accumulation Gate voltage (V)Themadag Organic and Printed Electronics November 10th 2011 4
  3. 3. Field effect transistors: layouts bottom contact top contact bottom gate top gateThemadag Organic and Printed Electronics November 10th 2011 5 Organic Field Effect Transistor Rollable display TFTs on ultra-thin plastic Room temperature deposition Organic materials Integrated in a rollable display Resulting in an extremely thin and flexible backplane Enable simple, room temperature processing Organics are highly flexibleThemadag Organic and Printed Electronics November 10th 2011 6
  4. 4. (Rollable) Active Matrix display Active matrix display is a grid of pixels, with a switch connected to each pixel: Switch = TFT CEink S Data line D G pixel Gate lineThemadag Organic and Printed Electronics November 10th 2011 7 (Rollable) Active Matrix display data line pixelThemadag Organic and Printed Electronics November 10th 2011 8
  5. 5. (Rollable) Active Matrix display Data Selection pulseThemadag Organic and Printed Electronics November 10th 2011 9 Why displays on flexible carriers Proposition Target market Rollable/Foldable Mobile phones, E-readers, UMPCs, … Flexible Smartcards, advertisement, point of sale, wearable, … Robust and lightweight E-readers, point of sale, advertisement, …Themadag Organic and Printed Electronics November 10th 2011 10
  6. 6. Mobile market: More powerful smaller devices Device Size decreasing Storage increasing Content volume increasing 1G More data 3G+ Mobile display size Av. Display Av. Display Size 1.65” No relative improvement Size 2” Limited by glass based display technologyThemadag Organic and Printed Electronics November 10th 2011 11 The need for rollable displays Device size no longer coupled to display size Display larger than the device itself. Ease of mobility Display size ratio: Smart phone: <0.3 iPhone: 0.56 Rollable: >1 Display sizeThemadag Organic and Printed Electronics November 10th 2011 12
  7. 7. Main technology choices Typical dimensions: ƒ Pixel: 150μm x 150μm ƒ Smallest dimensions: 5μm ƒ Overlay accuracy: < 5 μm ƒ Layer thicknesses: < 2μm ƒ Total display thickness for a rollable display: <100μmThemadag Organic and Printed Electronics November 10th 2011 13 Main technology choices Technology Technologies currently under development block Substrate Plastic Steel Substrate Bond-debond Free standing Transfer handling Matrix stack Organic a-Si Poly-Si oxides Patterning Lithography Printing Other methods Frontplane Electrophoretic OLED Ch-LC LCDThemadag Organic and Printed Electronics November 10th 2011 14
  8. 8. Substrate • Chemical stability • Thermal stability • Surface quality • Stiffness For PEN: E = 6 GPa t = 25 μm D = 0.11 Nm Q =0.33 Et 3 D 12(1 Q ) For steel: E = 190 GPa Q = 0.27 – 0.30 t = 8μm D = 0.11 NmThemadag Organic and Printed Electronics November 10th 2011 15 SubstrateThemadag Organic and Printed Electronics November 10th 2011 16
  9. 9. SubstrateThemadag Organic and Printed Electronics November 10th 2011 17 Substrate handling ƒ Free standing (roll to roll or sheet to sheet). Keep in mind the desired substrate thickness. ƒ Transfer ƒ Bond-debondThemadag Organic and Printed Electronics November 10th 2011 18
  10. 10. Matrix stack Semi-conductor: ƒ poly-Si: vacuum deposition at T 600°C ƒ amorphous Si: vacuum deposition / PECVD at T 100°C ƒ organic: vacuum deposition or spin coating, low temperature ƒ (mixed) oxides: low T vacuum deposition (ZnO, Ga2O3, ZnMgO, …) Dielectrics: ƒ inorganic: vacuum deposition ƒ organic: spin coatingThemadag Organic and Printed Electronics November 10th 2011 19 Patterning: printing the vision of kilometers display produced per minute using roll-to-roll printing methodsThemadag Organic and Printed Electronics November 10th 2011 20
  11. 11. Benchmarking different printing technologies Printing Feature Layer thickness Registration Throughput Technique size (μm) (μm) (μm) (m²/s) Inkjet 20-50 0.5 5 - 20 0.01 – 0.5 Flexography 80 0.8 - 2.5 200 3 - 30 Gravure 75 0.1 – 8.0 20 3 - 60 Screen 20 - 200 0.015 - 100 25 2-3 Offset 10 - 50 0.5 – 2.0 10 5 - 30 Pad 20 1 -2 10 0.1Themadag Organic and Printed Electronics November 10th 2011 21 Patterning Chosen for lithographic patterning: - Subtractive technique - Sacrificial layer + Proven manufacturing technology + Huge installed base + Compatible with standard AMLCD manufacturingThemadag Organic and Printed Electronics November 10th 2011 22
  12. 12. Frontplane Electrophoretic display (EPD) effect: Black and white particles with opposite charge in a clear liquid.Themadag Organic and Printed Electronics November 10th 2011 23 Polymer Vision technology Technology Technologies currently under development block Substrate Plastic Steel Substrate Bond-debond Free standing Transfer handling Matrix stack Organic a-Si Poly-Si oxides Patterning Lithography Printing Other methods Frontplane Electrophoretic OLED C-LC LCDThemadag Organic and Printed Electronics November 10th 2011 24
  13. 13. AM backplane layout Pixel electrode Field insulator Semiconductor Column Pixel electrode Row Insulator Plastic substrate Rigid supportThemadag Organic and Printed Electronics November 10th 2011 25 carrier Display construction Display construction Laminate electrophoretic frontplane laminate Laminate electrophoretic frontplane laminate Field insulator Semiconductor Field insulator Semiconductor Column Pixel electrode Column Pixel electrode Row Insulator Row Insulator Plastic substrate Plastic substrate Rigid support Rigid support carrierThemadag Organic and Printed Electronics November 10th 2011 26 carrier
  14. 14. Thinnest, most flexible display in the World Plastic substrate 30Pm E Ink display effect 40Pm 0.1mm Organic electronics backplane 5Pm Plastic substrate 25Pm • Ultra-thin is rollable: roll radius § 50 x thicknessThemadag Organic and Printed Electronics November 10th 2011 27 Unbreakable displayThemadag Organic and Printed Electronics November 10th 2011 28
  15. 15. Brief history – Philips Research highlights 1995 First logic gates 1998 All-polymer ICs, first transponders (Si diode) 2000 150mm wafer process, scaleable and industrial 2000 World’s 1st OE glass-based display 2003 shift registers (~ 2000 TFTs) 2004 Ferroelectric memory transistors Time (s) 2006 13.56MHz RFID tag 2000 2001 2002 2003 2004 rigid Grey scale flexible Size QVGA rollableThemadag Organic and Printed Electronics November 10th 2011 29 About Polymer Vision 20xx “A rollable display in every mobile device!” : : 2010 MA local AMLCD facility 2009 Assets acquired by 2008 Qualified rollable display and device 2007 Production line transfer yield 2006 Spin-out of Polymer Vision Ltd. 2005 Concept device development : 2000 Development of rollable display : 1991 Research on organic electronicsThemadag Organic and Printed Electronics November 10th 2011 30
  16. 16. Summary Polymer Vision offers a robust, flexible and even rollable display solution. Polymer Vision uses proven manufacturing technologies to introduce a new display technology. The technology and process have successfully been introduced into a G2.5 AM-LCD line. The technology has further matured by the introduction of a full VGA display and touch.Themadag Organic and Printed Electronics November 10th 2011 31 Food for thought ƒ Can cost be the driving force for introduction of disruptive alternative technologies (e.g. LCD versus CRT)? ƒ Why is batch processing so popular in LCD and IC manufacturing? ƒ Why is printing of e.g. value paper still done sheet to sheet?Themadag Organic and Printed Electronics November 10th 2011 32

×