47.1: <i>Invited Paper</i>: Highly Robust Flexible AMOLED Display on Plastic Substrate with New Structure

Jin, Dong-Un; Kim, Tae‐Woong; Koo, Hyun-Woo; Stryakhilev, Denis; Kim, Hyung–Sik; Seo, Sunae; Kim, Moojin; Min, Hoonkee; Chung, Ho Kyoon; Kim, Sang Soo

doi:10.1889/1.3500565

Cited by 36 publications

(22 citation statements)

References 10 publications

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“…However, an OLED display usually has several functional films apart from the OLED panel (see Figure ). The other methodology is placing the neutral plane around a weak layer of the OLED display, such as the thin‐film encapsulation (TFE) or thin‐film transistor (TFT) layer, using additional films . However, this solution must finely balance the functionality versus foldability trade‐off.…”

Section: Introductionmentioning

confidence: 99%

A 5.5‐inch full HD foldable AMOLED display based on neutral‐plane splitting concept

et al. 2019

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Splitting of the mechanical neutral plane is a promising concept for foldable displays because it reduces the folding stress in each layer of the display. We verified the splitting concept experimentally and revealed a linear relation between the relative position of the neutral plane and the logarithm of the adhesive's elastic modulus. As the modulus decreased, the position of the neutral plane approached that of perfect splitting. On the basis of the neutral‐plane splitting concept, we developed 5.5‐inch full high‐definition foldable active matrix organic light‐emitting diode (AMOLED) displays, which endured 150 k inward folding cycles and 150 k outward folding cycles with folding radii of 3 and 5 mm, respectively. This study is expected to improve the flexibility of designing foldable AMOLED displays, enabling better balance of the portability versus practicality trade‐off in mobile displays.

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Section: Introductionmentioning

confidence: 99%

A 5.5‐inch full HD foldable AMOLED display based on neutral‐plane splitting concept

et al. 2019

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“…The AMOLED display contains functional brittle inorganic layers that have different purposes and could easily fail during bending. A number of literatures have pointed out that we can place the mechanically vulnerable components (TFT backplane and OLED) close to the zero‐strain plane (the neutral plane) to improve the reliability and flexibility of flexible displays . But, the inorganic layers used for encapsulation layers would be far away from neutral plane and easily fail during bending.…”

Section: Objective and Backgroundmentioning

confidence: 99%

Improving the flexibility of AMOLED display through modulating thickness of layer stack structure

et al. 2016

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-A robust methodology is established to predict the critical bending radius of a flexible AMOLED. According to the methodology, the critical bending radius of display manufactured by the same process could be reduced from 7 mm to 4 mm by modulating the layer stack thickness.Keywords -flexible, neutral plane, stress, strain, simulation, AMOLED. DOI # 10.1002/jsid.443 Objective and backgroundRecently, there are many significant investments in the development of flexible display technology. Several flexible AMOLED products are already available in the display market. But, these products are only slightly curved and remain rigid, which are not as much different from the present glass-based portable device as one could anticipate from a flexible display. In order to realize flexible display applied to the rollable or foldable device of next generation, it is necessary to reduce the critical bending radius.The structure of a flexible AMOLED display can be divided into several parts: the flexible substrate, TFT backplane, OLED, and encapsulation layers. The AMOLED display contains functional brittle inorganic layers that have different purposes and could easily fail during bending. A number of literatures have pointed out that we can place the mechanically vulnerable components (TFT backplane and OLED) close to the zero-strain plane (the neutral plane) to improve the reliability and flexibility of flexible displays.1-4 But, the inorganic layers used for encapsulation layers would be far away from neutral plane and easily fail during bending.OLED materials are extremely sensitive to ambient water vapor and oxygen, which causes oxidation of cathode and results in the formation of black spots in electroluminescence. [5][6][7][8] Therefore, keeping the performance of encapsulation layers during bending is important. The most common technique of encapsulation for flexible AMOLED is the thin-film encapsulation (TFE) 9-12 that is fabricated by alternative stacks of inorganic and organic layers. In order to protect the TFE layer, we modulate the thickness of organic layers. In our structure configuration, we maintain the neutral plane located on TFT and OLED layers but change the thicknesses of organic layers. The inorganic layers in TFE component could get closer to the neutral plane and take lesser strain. Experiment and process flowA robust methodology consisting of a mechanical model of multi-films under bending loads and experiment of bending test is proposed to predict the critical bending radius of a flexible AMOLED display. Figure 1 shows the process flow. We apply this methodology in different layer stack structure configuration and try to reduce the critical bending radius.The flexible AMOLED interpreted below is fabricated by PI substrate with SiNx bottom barrier to perform the IGZO TFT process, then, deposit the OLED material and encapsulated by thin-film encapsulation (TFE) process. The TFE layer is made by stacks of SiNx layers and "organic coating for planarization (OCP)" layers, alternately. SiNx is dep...

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“…Significant progress has been made in achieving a flexible TSP design [16][17][18], a foldable/seamless TSP integrated display [19][20] and a robust rollable display [21].…”

Section: Literature Review Capacitive Touch-screen Sensorsmentioning

confidence: 99%

Electrostatic Simulation Methodology for Capacitive Touch-Screen Panels

Cannon¹,

Brennan²

2014

25th IET Irish Signals &Amp; Systems Conference 2014 and 2014 China-Ireland International Conference on Information and Communi

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47.1: Invited Paper: Highly Robust Flexible AMOLED Display on Plastic Substrate with New Structure

Cited by 36 publications

References 10 publications

A 5.5‐inch full HD foldable AMOLED display based on neutral‐plane splitting concept

A 5.5‐inch full HD foldable AMOLED display based on neutral‐plane splitting concept

Improving the flexibility of AMOLED display through modulating thickness of layer stack structure

Electrostatic Simulation Methodology for Capacitive Touch-Screen Panels

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