High aspect ratio microdisplay and thin optical component for glass-like AR devices

Kang, Chan‐mo; Shin, Jin‐Wook; Choi, Sukyung; Kwon, Byoung‐Hwa; Cho, Hyunsu; Cho, Nam Sung; Lee, Jeong Ik; Lee, Hyunkoo; Lee, Jeong‐Hwan; Kim, Hokwon; Cho, Ara; Park, Sang Hyun; Kim, Min Seok; Park, Soon-gi; Kim, Youngjoon; Ha, Jeonghun; Kim, Jaehyeok; Lee, Jong Soo; Lee, Seung No; Im, Yu Bin; Byun, Chun‐Won

doi:10.1080/15980316.2021.1902405

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…Considering the characteristics of OLED, which is vulnerable to moisture and oxygen, an Al2O3 and SiNX double inorganic thin film was produced through ALD and PECVD processes, respectively. Al2O3 was selected as the inorganic layer because it can provide excellent protection against moisture and oxygen even at a very thin thickness [5]. A thin organic layer was fabricated on top of the double inorganic layers consisting of 60 nm Al2O3 and 150 nm SiNX.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, ultra-high-resolution microdisplays require a sub-micron level passivation layer. Currently, the passivation layer in microdisplays uses a TFE (Thin Film Encapsulation) structure [1][2][3]5]. The TFE of microdisplays is produced by depositing thin inorganic layers using the ALD (Atomic Layer Deposition) process or PECVD (Plasma Enhanced Chemical Vapor Deposition) process [6].…”

Section: Introductionmentioning

confidence: 99%

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95‐3: Fabrication of Sub‐Micron Organic/Inorganic Hybrid Thin‐Film Encapsulation on Ultra‐High‐Resolution Microdisplays Using Inkjet Printing Process.

Kim,

Joo,

Shin

et al. 2024

Symp Digest of Tech Papers

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In this study, we fabricated sub‐micron organic/inorganic hybrid TFE (Thin Film Encapsulation). We utilize an inkjet printing process to fabricate organic layer. It has excellent industrial applicability by using an industrial printhead with 1024 nozzles. The thickness of the organic layer is optimized through the DPI (Drops Per Inch) of inkjet printing and surface treatment of substrate. The sub‐micron organic/inorganic hybrid TFE was fabricated on a TEOLED (Top Emission Organic Light Emitting Diode), and the OLED (Organic Light Emitting Diode) with the fabricated TFE did not show degradation. Under constant temperature and humidity conditions 30°C, 90 % R.H. (Relative Humidity), the luminance of the OLED remained the same without any defects. The fabricated TFE for the production of OLEDoS has excellent encapsulation properties even at a thin thickness. Finally, we are investigating the optical properties of the ultra‐high‐resolution microdisplay panel applied with the sub‐micron organic/inorganic hybrid TFE.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

95‐3: Fabrication of Sub‐Micron Organic/Inorganic Hybrid Thin‐Film Encapsulation on Ultra‐High‐Resolution Microdisplays Using Inkjet Printing Process.

Kim,

Joo,

Shin

et al. 2024

Symp Digest of Tech Papers

Self Cite

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“…Because the distance between sub-pixels in the normal OLED display is large, approximately tens of micrometers, adjacent sub-pixels are not affected by lateral leakage current when a sub-pixel is electrically driven owing to the very high sheet resistance of organic materials. However, the distance between sub-pixels in the OLED microdisplay is approximately hundreds of nanometers 15 , 16 . Consequently, the driving voltage in the green (G) sub-pixel can cause a crosstalk current in the red (R) and blue (B) sub-pixels, called electrical crosstalk, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Investigating the electrical crosstalk effect between pixels in high-resolution organic light-emitting diode microdisplays

Kang,

Hwang,

Kang

et al. 2023

Sci Rep

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Organic light-emitting diode (OLED) microdisplays have received great attention owing to their excellent performance for augmented reality/virtual reality devices applications. However, high pixel density of OLED microdisplay causes electrical crosstalk, resulting in color distortion. This study investigated the current crosstalk ratio and changes in the color gamut caused by electrical crosstalk between sub-pixels in high-resolution full-color OLED microdisplays. A pixel structure of 3147 pixels per inch (PPI) with four sub-pixels and a single-stack white OLED with red, green, and blue color filters were used for the electrical crosstalk simulation. The results showed that the sheet resistance of the top and bottom electrodes of OLEDs rarely affected the electrical crosstalk. However, the current crosstalk ratio increased dramatically and the color gamut decreased as the sheet resistance of the common organic layer decreased. Furthermore, the color gamut of the OLED microdisplay decreased as the pixel density of the panel increased from 200 to 5000 PPI. Additionally, we fabricated a sub-pixel circuit to measure the electrical crosstalk current using a 3147 PPI scale multi-finger-type pixel structure and compared it with the simulation result.

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Microdisplays: Mini‐LED, Micro‐OLED, and Micro‐LED

Miao

Hsiao

Sheng

et al. 2023

Advanced Optical Materials

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The field of next‐generation microdisplays is flourishing. Relevant display technologies, such as mini‐light emission diodes (mini‐LEDs), micro‐organic light emission diodes (micro‐OLEDs), and micro‐light emission diodes (micro‐LEDs) are thus in the urgent stage of development. From this perspective, comprehensive and systematical analyzes are conducted for the aforesaid microdisplay configurations. A holistic view of microdisplay technologies is developed with the corresponding performance metrics, providing a path for miscellaneous scenarios. Among these scenarios, the applications in augmented reality (AR), virtual reality (VR), wearable devices, and head‐up displays (HUD) are currently attracting considerable attention for deeper human‐digital interactions. However, there is a multiplicity of obstacles and challenges hindering such development. Nevertheless, recent advances in microdisplay technologies hold tremendous promise for the paradigms of these applications, taking a leap forward for next‐generation microdisplays. This review presents perspectives, relevant materials, and the technology landscape for such ongoing display technologies, offering guidance on the design of advanced microdisplays.

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High aspect ratio microdisplay and thin optical component for glass-like AR devices

Cited by 9 publications

References 16 publications

95‐3: Fabrication of Sub‐Micron Organic/Inorganic Hybrid Thin‐Film Encapsulation on Ultra‐High‐Resolution Microdisplays Using Inkjet Printing Process.

95‐3: Fabrication of Sub‐Micron Organic/Inorganic Hybrid Thin‐Film Encapsulation on Ultra‐High‐Resolution Microdisplays Using Inkjet Printing Process.

Investigating the electrical crosstalk effect between pixels in high-resolution organic light-emitting diode microdisplays

Microdisplays: Mini‐LED, Micro‐OLED, and Micro‐LED

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