AIMCAL R2R Conference

Transcription

1

2 Contents Introduction Markets OLED Structures Technology Fabrication Process Evaluation (Microstructure & etc) Summary

3 Introduction [Merit of Rigid OLED Display] Cheap product cost Mass production Free size & Large area display Foldable [OLED Display : Rigid Flexible ] Light & unbreakable materials Rollable Easy to handle (folding & rolling) AIMCAL Free shape (rounding R2R type) Conference

4 Introduction Curved & Bendable Foldable & Rollable Stretchable Terms - Simple structure - Periodically transformation on - Large polymer area shaping films - Easy for displacement rollable OLED - Random change - Bio-medical insertion Applications Benefits - Exclusive design - Increased visible immersion - High reslolution - High portability - Unlimit from phone to tablet - Simple installation (rollable) - Realized free form-factor - Multi-folding - Customized display

5 Markets Market size of foldable phone Market trends of Display Type Galaxy X series : 8.94 inch out-folding type Huawei Mate X : 8.4 inch 4K in-folding type (dual display, fingerprint) Apple : plastic display (under testing) Y2016 ~ Launch to Curved (LG signature TV) Y2020 ~ Dominant market to Foldable Display (12 ~ 14 inch Tablet) Y2025 ~ established to Rollable Display (Signage & Public Display) Foldable Rollable (Citation : HIS Market 2016)

6 Flexible OLED Structure Protection layer Cover Organic/Inorganic Plastic Cover Plastic thin film multi-layer Touch Film Sputter layer Color on Filter polymer films Flexible Color for Filterrollable OLED Monomer layer FEM Front Glass Encapsulation Barrier Film Sputter layer OLED (RGB) Oxide TFT Back Glass [Requirements of Products] WOLED + MOx TFT Presented Substrate by: (PI Film) Jung Cho Carrier Film Film Substrate Anti-reflection Degrees of Water vapor transport ratio as same as glass(oled+o2 = Degradation) : 10-4 ~ 10-6 g cm/day Degrees of transmittance as same as glass : PET 90%, COP 92% Degrees of Anti-reflection ratio : reflectance 1.0%

7 Flexible OLED Process PET Adhesive (weak) Barrier Encapsulation - Curl protection films before lift off glass micro PET film - 3 ~ 10 g adhesive properties OLED Oxide TFT Polyimide Glass ITO SiO2 PC, COP or PET film weak to attack from water vapor or oxygen - Enhanced barrier properties after glass remove - Transparent EMI shield properties - Properly adhesiveness between PI and ITO layer

8 Key Technology Main : SIO 2 and other various oxides sputtering of single or mulyi-layer using plasma & vacuum technology Key technology : - Low temperature sputtering (Polymer Film base) - Gas distribution system (Optical & electrical properties decides) - Detail thickness Uniformity Controls (Max 1,600mm width within 3%) - Roll to Roll tension control (minimize film damage ) - Adhesion promotion between substrate film and coating layer - Optical design and simulation technology by Mclaud [R2R sputter system]

9 Key process Conventional Process FEM Process Vacuum Vacuum Oxide/Nitride Under coating PET film wet Coating Repeat Drying Inclusion Defect Scratch monomer Oxide/Nitride Under coating PET film Cover coat Oxide/Nitride monomer Oxide/Nitride AIMCAL R2R Under coating Conference PET film

10 High Barrier structure Over-all Structure PET H/C Layer 1 Layer 2 Layer 3 Layer 4 Layer 5

11 High Barrier Structure Structure (SEM) OTR* (cc/ m2 day) WVTR* (g/ m2 day) FEM Inorg./Org./Inorg. K-PET (12.5 μm ) Ny (25 μm ) AL foil (7 μm ) LLDPE (50 μm ) Competitor Barrier Film PET(12 μm )+Al(30 nm ) PET(12 μm )+Al(30 nm ) PET(12 μm )+Al(30 nm ) LLDPE (50 μm ) below 5 X X X X 10-2 * OTR (Oxygen Transmission AIMCAL Rate), WVTR (Water Vapour R2R Transmission Conference Rate)

12 Reliability Test Results 1. Spikes : plastic & handling 2. Scratches : handling Organic/Inorganic 3. thin Pits arcing, film possible multi-layer contamination of plastics on polymer films 4. Barrier for cracking rollable : local adhesion OLED issues (pre-contamination

13 Functional Layers for Flexible OLED Nanostructured oxide PET multi layer barrier film Oxide layer oxide polymer Out Structure of multi-functional barrier encapsulation films A R T O U C H S UPresented B by: Jung Cho B S T R A T E A R R I E R Transparent Flexible OLED (under development) Permeation barrier degree : 10-2 ~10-5 g/m 2 /day (encapsulation properties) Silver nanowire type capacitive touch panel systems with COP substrates Anti-reflection layers by multi-layer sputter coating (5 or 7-layers) T: 94.5%, R: 0.13%, Haze 0.65% (substrates : PET) Additional anti-finger, anti-smuggles or anti-corrosion coatings

14 Permeation Blocking Mechanism Water or Oxygen transportation mechanism Environmental Test Competitor Wet coating Inorganic Water penetration Inorganic FEM Inorganic Monomer <Competitor> <FEM> Vacuum coating Inorganic monomer Inorganic Inorganic 50 nm

15 Optical properties Slide Header T R PET PC/PMMA COP T (%) L* PET Isotropic PC COP a* b* Haze R (%) L* a* b* WVTR (g/m 2 day) OTR (g/m 2 day) Transmittance & Reflectance (%) Wavelength (nm) PET PC/PMMA COP

16 Barrier Properties

17 Flexibility & Mechanical properties Slide Header ITO Film ITO Film Organic/Inorganic Bending/Rolling Axis thin film ITO multi-layer Film Bending Axis Tensile strength : 231 MPa Elongation : 65 % Tensile strength : MPa Elongation : 82 %

18 Inorganic layer Configuration Sample No. SiOx (1) SiOx (2) SiOx (3) 투과율 반사율 Thickness Control od Silicone Oxide for low surface roughness < SiOx (1) > < SiOx (2) > < SiOx (3) > Optical Properties of Silicone Oxide T (%) L* a* b* R (%) L* a* b* Presented by: Jung 90 Cho Transmittance & Reflectance (%) SiOx (1) SiOx (2) SiOx (3) Wavelength (nm)

19 Surface roughness Surface Characteristics : Normal Surface Characteristics : After Treatment

20 Summary 1. Roll-to-Roll coating Barrier Film by 500 mm wet & dry coating systems - Formation of Inorganic / Organic / Inorganic multi-layer with vacuum conditions - Surface roughness control and hydrophilic multi-layer condition of substrate to enhance moisture barrier property 2. Improvement of transmittance and optical characteristics - Since it is difficult to secure the optical characteristics as a basic process, it is possible to lower the reflectance Improved transmittance and other optical properties by coating the optical control layer on the opposite side of the barrier film - Developed non-yellowish barrier film by improving colors such as a * and b * 3. Development of multi-layer process technology - Monolayer high density thin film conditions to replace common wet organic coatings - Development of facility concept to coat wet and dry on-line at one time - Establishment of process to impregnate nano-particles finally after implementing multilayer film by dry process