Flexible Colour Active Matrix EP   Display Using Low Distortion              oTFT Backplanes                        Paul C...
Speaker Introduction    Flexible Colour Active Matrix EP Display Using Low                Distortion oTFT BackplanesPaul C...
Plastic Electronics TechnologyUses plastic instead of traditional silicon semiconductors and glassEnables a revolutionar...
Company History                                       Display Development10+ transistors         100+ transistors      1.2...
The Manufacturing ChallengeIt is one thing to show a single display at a tradeshow…...quite another to develop a high yiel...
R&D and Production Set-Up                          Technology                             Transfer   Cambridge R&D  Protot...
R&D and Production Set-Up                Technology                   Transfer                                      Dresde...
Electrophoretic Plastic Display                  SID Displayweek 2012   June 7th 2012   8
Electrophoretic Display Media                SID Displayweek 2012   June 7th 2012   9
Distortion                                            Flexible substrate      GLASS                                       ...
Low Distortion Backplane - Design                                                                                    Pixel...
Low Distortion Backplane - Measured Backplane distortion measured OGP Vantage coordinate                         Measur...
Colour EP Display Architecture                   Encapsulation sheet                          Colour Filter Array         ...
Colour Filter Overlay RGBW colour filter patterned onto E Ink surface Overlay accuracy of 10µm achieved across the activ...
Colour Display Performance - Gamut                                       4 colour densities tested                       ...
Colour Display Performance - White                                                              Acknowledgement: A. Boucha...
Colour Display Performance                                                    Display size                  10.7”         ...
Colour Display Performance      Display size          10.7”   Backplane subpixel     1280 x 960       resolution     Subpi...
Process enables higher resolutions….                SID Displayweek 2012   June 7th 2012   19
Summary We have developed a new approach to manufacture low distortion  flexible plastic displays:     Compatible with l...
http://www.plasticlogic.com   SID Displayweek 2012       June 7th 2012   21
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Plastic Logic Flexible Colour Active Matrix EP Display Using Low Distortion oTFT Backplanes

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SID Display Week 2012 presentation given by Paul Cain, Senior Manager, Technology, at Plastic Logic.

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Plastic Logic Flexible Colour Active Matrix EP Display Using Low Distortion oTFT Backplanes

  1. 1. Flexible Colour Active Matrix EP Display Using Low Distortion oTFT Backplanes Paul Cain 7th June 2012
  2. 2. Speaker Introduction Flexible Colour Active Matrix EP Display Using Low Distortion oTFT BackplanesPaul Cain, PhD CEngSenior Manager, TechnologyPlastic Logic, Cambridge UK.• Over 10 years at Plastic Logic• Focus on novel processes, device architectures, new technology integration• Technology Transfer to Dresden Production Facility• Over 20 patents / applications• PhD Physics (Cavendish Laboratory, Cambridge University) SID Displayweek 2012 June 7th 2012 2
  3. 3. Plastic Electronics TechnologyUses plastic instead of traditional silicon semiconductors and glassEnables a revolutionary design and form-factor Shatterproof, Thin, Large and Light Display
  4. 4. Company History Display Development10+ transistors 100+ transistors 1.2 M transistors Colour EPD 2.8 M transistors Research, Process Development & Manufacturing 2000: Cambridge Technology 2008: Dresden Display Factory Cambridge University Center translating research First plastic electronics factory in Research in organic electronics into products the world SID Displayweek 2012 June 7th 2012 4
  5. 5. The Manufacturing ChallengeIt is one thing to show a single display at a tradeshow…...quite another to develop a high yield manufacturing process SID Displayweek 2012 June 7th 2012 5
  6. 6. R&D and Production Set-Up Technology Transfer Cambridge R&D Prototype Line (14”) Cambridge R&D Prototype Line  Proof of concepts  Highly configurable process  New designs in < 1 month  1” Chips to A4 displays  R&D Engineers SID Displayweek 2012 June 7th 2012 6
  7. 7. R&D and Production Set-Up Technology Transfer Dresden Factory (Gen 3.5) Dresden Gen. 3.5 Factory  Backplane Manufacturing  Qualified volume process  Production equipment  Fully Automated Handling  Process, Equipment, Integration Engineers  Thousands of displays/week SID Displayweek 2012 June 7th 2012 7
  8. 8. Electrophoretic Plastic Display SID Displayweek 2012 June 7th 2012 8
  9. 9. Electrophoretic Display Media SID Displayweek 2012 June 7th 2012 9
  10. 10. Distortion Flexible substrate GLASS RIGID CARRIER FPD industry processes designed assuming glass substrates Processing on flexible plastic:  Dimensions affected by temperature, humidity  Irreversible and reversible components. Multiple methods used to reduce distortion  Low temperature processing  Reduced thickness flexible substrate  High Tg substrate material (eg PI) Trade-offs with each approach Plastic Logic approach re-sets distortion by design, without losing pixel performance:  Common substrates to be used (eg PET)  Mounted or un-mounted plastic substrates (eg Roll to roll) SID Displayweek 2012 June 7th 2012 10
  11. 11. Low Distortion Backplane - Design Pixel Conventional glass Electrode backplanes require regular grid for all layers Interlayer (source, drain, gate, via, etc Via Dielectric ) This allows overlay of pre- patterned layers (eg Colour Filter) Distortion in flexible substrates makes this difficult Plastic Logic Process resets distortion at the pixel electrode layer, with no loss Plastic Backplane: Top Pixels Glass Backplane: All stack in pixel performance. layers on a regular grid maintained on a regular grid SID Displayweek 2012 June 7th 2012 11
  12. 12. Low Distortion Backplane - Measured Backplane distortion measured OGP Vantage coordinate  Measurement Area 217.6mm x measurement system used 163.2mm Distortion controllable to < 5um in  150 PPI Backplane production.  100 point sample  Maximum measured deviation  ∆X [-2.3, 1.8] µm  ∆Y [-3.1, 4.1] µm SID Displayweek 2012 June 7th 2012 12
  13. 13. Colour EP Display Architecture Encapsulation sheet Colour Filter Array Plastic Substrate E Ink Frontplane Plastic Logic Backplane Technology Low Distortion Plastic Plastic Substrate Logic Backplane Colour Filter patterned by multiple approaches (wet printing, sheet-to-sheet alignment). During CFA pattern formation, the backplane pixel electrodes are not visible (obscured by E Ink layer). Backplane:  1280 x 960 pixels (monochrome) = 640 x 480 Colour  150PPI (monochrome) = 75PPI Colour  Active Area: 217.6mm x 163.2mm SID Displayweek 2012 June 7th 2012 13
  14. 14. Colour Filter Overlay RGBW colour filter patterned onto E Ink surface Overlay accuracy of 10µm achieved across the active area Four variants of different colour density investigated RGBW CFA pattern over E Ink R pixels driven “white” to show alignment SID Displayweek 2012 June 7th 2012 14
  15. 15. Colour Display Performance - Gamut  4 colour densities tested (A,B,C,D)  Gamut (∆E3):  Type A: 5000  Type B: 4000  Type C: 3400  Type D: 3000  Excellent colour uniformity, viewing angle Acknowledgement: A. Bouchard, E Ink SID Displayweek 2012 June 7th 2012 15
  16. 16. Colour Display Performance - White Acknowledgement: A. Bouchard, E Ink D C B Type A 25% white state reflectivity achieved No compromise in optical performance over glass colour filters / backplanes. SID Displayweek 2012 June 7th 2012 16
  17. 17. Colour Display Performance Display size 10.7” Backplane subpixel resolution 1280 x 960 Subpixel pitch 170um (150subPPI) Backplane Grey Levels 16 NTSC 2-5% Contrast Ratio 12:1 Reflectance 50-57 L* Good white state maintained whilst achieving useful colour gamut Excellent contrast maintained due to excellent black state. Colour uniformity good across 10.7” display area. SID Displayweek 2012 June 7th 2012 17
  18. 18. Colour Display Performance Display size 10.7” Backplane subpixel 1280 x 960 resolution Subpixel pitch 170um (150subPPI) Backplane Grey Levels 16 NTSC 2-5% Contrast Ratio 12:1 Reflectance 50-57 L* Excellent readability maintained  (High contrast) Colour gamut high enough to enable distinguishability Paper-like finish for the colour display (no glass layer above the display) SID Displayweek 2012 June 7th 2012 18
  19. 19. Process enables higher resolutions…. SID Displayweek 2012 June 7th 2012 19
  20. 20. Summary We have developed a new approach to manufacture low distortion flexible plastic displays:  Compatible with lower cost substrate materials,  Process qualified for production,  Allows integration with a wider range pre-pixelated materials We have shown 75 PPI 10.7” colour displays using this qualified process  Measured performance equivalent to glass EPD colour  Visual performance enhanced due to absence of glass colour filter. For demonstrations of our technology, including colour please visit the Plastic Logic YouTube Channel: http://www.youtube.com/user/PlasticLogic SID Displayweek 2012 June 7th 2012 20
  21. 21. http://www.plasticlogic.com SID Displayweek 2012 June 7th 2012 21

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