46‐2: <i>Invited Paper:</i> A Flexible OLED Display with Robustness and Bendability

Eguchi, S.; Kato, S.; Kamada, Taisuke; Suematsu, Y.; Nakamura, Daiki; Nagata, T.; Aoyama, Teruyoshi; Sugisawa, Nozomu; Toyotaka, Kouhei; Katayama, Masahiro; Adachi, Hiroki; Yamazaki, Shunpei

doi:10.1002/sdtp.13000

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…During usage, flexible printed electronics would undergo different types of deformation. Figure 4 shows several applications of flexible electronics and relevant types of deformation during usage [52][53][54]. A sensor would be uniaxially or biaxially bent to conform onto the vehicle's body, as shown in Figure 4(a).…”

Section: Mechanical Testing Of Flexible Printed Electronicsmentioning

confidence: 99%

Mechanical and High-Frequency Electrical Study of Printed, Flexible Antenna Under Deformation

Zhou

Sivapurapu

Swaminathan

et al. 2020

IEEE Trans. Compon., Packag. Manufact. Technol.

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The meaningful discussions we shared on research work and life have indeed made my experience in graduate school more than enjoyable. In addition, I would like to thank other professionals and students who are involved in my research including Dr. Jim Huang from Hewlett Packard Enterprise as well as Sridhar Sivapurapu and Nahid Aslani Amoli from Dr. Swaminathan's group. Many thanks are due to my parents who always stood behind every critical decision I made. I would not have accomplished this milestone without their love, support, and trust. I would like to acknowledge that this material is based, in part, on research sponsored by Air Force Research Laboratory under agreement number FA8650-15-2-5401, as conducted through the flexible hybrid electronics manufacturing innovation institute, NextFlex. ivTABLE OF CONTENTS ACKNOWLEDGEMENTS iii LIST OF TABLES vi LIST OF FIGURES vii LIST OF SYMBOLS AND ABBREVIATIONS xiv SUMMARY xvi CHAPTER 1. INTRODUCTION CHAPTER 2. BACKGROUND AND LINTERATURE REVIEW 2.1 History of Conformal Antenna and Flexible Printed Antenna 2.2 Mechanical Testing of Flexible Printed Electronics 2.3 Antenna Performance Under Strain CHAPTER 3. OBJECTIVES AND SCOPE CHAPTER 4. ANTENNA DESIGN AND FABRICATION RESULTS 4.1 Fabrication Process 4.2 Antenna Design in HFSS 4.2.1 Layer Thickness 4.2.2 Material Electrical Properties 4.2.3 HFSS Simulation Setup and Results 4.3 Fabrication Results and Comparison to Simulation CHAPTER 5. MANDREL BENDING TEST AND RESULTS 5.1 Mandrel Bending Test Over Different Sizes of Mandrel 5.1.1 Experimental Setup and Procedure 5.1.2 Experimental Test Results 5.2 Cyclic Mandrel Bending Test over Mandrel Size of 0.625 in. Radius 5.2.1 Experimental Procedure and Results of Sample P1 5.2.2 Experimental Procedure and Results of Sample P2 CHAPTER 6. MECHANICAL FINITE-ELEMENT ANALYSIS OF MANDREL BENDING TEST 6.1 Geometry Modeling 6.2 Material Modeling 6.2.1 Characterization of Printed Silver Ink's Property 6.2.2 Other Materials' Properties 6.3 Loading and Boundary Conditions v 6.4 Initial Meshing Details 6.5 Mesh Convergence and Simulation Results CHAPTER 7. BIAXIAL BENDING TEST AND RESULTS 7.1 Experimental Fixture Design and Setup 7.2 Experimental High-Frequency Measurement Results 7.3 SEM Images Results CHAPTER 8. MECHANICAL FINITE-ELEMENT ANALYSIS OF THE BIAXIAL BENDING TEST 8.1 Loading and Boundary Conditions 8.2 Mesh Convergence and Simulation Results CHAPTER 9. Conductivity Change Impact on Patch Antenna's High-Frequency Electrical Behavior 9.1 Updated HFSS Model 9.2 Conductivity Impact on the S11 Response CHAPTER 10. Conclusion, Contributions, and Future Work 10.1 Conclusion 10.2 Contributions 10.3 Future Work REFERENCES CHAPTER 1.

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Section: Mechanical Testing Of Flexible Printed Electronicsmentioning

confidence: 99%

Mechanical and High-Frequency Electrical Study of Printed, Flexible Antenna Under Deformation

Zhou

Sivapurapu

Swaminathan

et al. 2020

IEEE Trans. Compon., Packag. Manufact. Technol.

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show abstract

“…Flexible displays can be divided into several categories, such as curved, rollable, foldable, and stretchable displays, depending on the curvature and deformation mode of substrate [1][2][3]. Recently, foldable displays have received great attention in state-of-art mobile display due to their unique design, light weight, and large area screen [4][5][6][7]. For the commercialization of foldable displays, it is necessary to develop key components, such as foldable organic light-emitting diodes (OLED), foldable thin-film transistors (TFTs), high-performance plastic substrates to replace rigid glass substrates, and transparent and flexible cover window for flexible displays [8].…”

Section: Introductionmentioning

confidence: 99%

Transparent and Flexible SiOC Films on Colorless Polyimide Substrate for Flexible Cover Window

et al. 2021

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We fabricated transparent and flexible silicon oxycarbide (SiOC) hard coating (HC) films on a colorless polyimide substrate to use as cover window films for flexible and foldable displays using a reactive roll-to-roll (R2R) sputtering system at room temperature. At a SiOC thickness of 100 nm, the R2R-sputtered SiOC film showed a high optical transmittance of 87.43% at a visible range of 400 to 800 nm. The R2R-sputtered SiOC films also demonstrated outstanding flexibility, which is a key requirement of foldable and flexible displays. There were no cracks or surface defects on the SiOC films, even after bending (static folding), folding (dynamic folding), twisting, and rolling tests. Furthermore, the R2R-sputtered SiOC film showed good scratch resistance in a pencil hardness test (550 g) and steel wool test under a load of 250 g. To test the impact protection ability, we compared the performance of thin-film heaters (TFHs) and oxide-semiconductor-based thin-film transistors (TFTs) with and without SiOC cover films. The similar performance of the TFHs and TFTs with the SiOC cover window films demonstrate that the R2R-sputtered SiOC films offer promising cover window films for the next generation of flexible or foldable displays.

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“…For decades of time, AMOLED (active-matrix organic light emitting diodes) displays were considered to be the most potential candidate for foldable or even rollable display applications in the future for their unreplaceable flexible and bending properties [1][2]. Besides, they also have other outstanding display qualities like ultrahigh contrast ratio, fast response time and considerable color gamut comparing to conventional LCD (liquid crystal display) panels [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

P‐124: A 17.3‐inch WQHD Top‐Emission Foldable AMOLED Display with Outstanding Optical Performance and Visual Effects

Zhang

Yang

et al. 2020

Symp Digest of Tech Papers

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46‐2: Invited Paper: A Flexible OLED Display with Robustness and Bendability

Cited by 9 publications

References 26 publications

Mechanical and High-Frequency Electrical Study of Printed, Flexible Antenna Under Deformation

Mechanical and High-Frequency Electrical Study of Printed, Flexible Antenna Under Deformation

Transparent and Flexible SiOC Films on Colorless Polyimide Substrate for Flexible Cover Window

P‐124: A 17.3‐inch WQHD Top‐Emission Foldable AMOLED Display with Outstanding Optical Performance and Visual Effects

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