27.2: <i>Invited Paper:</i> High resolution FMM process for AMOLED displays

Kim, Chiwoo; Kim, Ki-Soo; Park, Jong Kab; Kim, Doh Hoon; Jung, Kiro

doi:10.1002/sdtp.13467

Cited by 7 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The CMOS (complementary metal-oxide semiconductor) with high electron mobility significantly reduces the circuit size. Moreover, new technologies such as laser patterned FMM 40 , silicon nitride mask 41 , photolithography method 42 , and electro-hydrodynamic printing 43 are also emerging to help achieve high-resolution density. The other method for OLED-on-silicon to fulfill high-resolution density is to use white-OLED (WOLED) with color filters.…”

Section: Lcds For Vrmentioning

confidence: 99%

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

et al. 2022

View full text Add to dashboard Cite

Liquid crystal displays (LCDs) and photonic devices play a pivotal role to augmented reality (AR) and virtual reality (VR). The recently emerging high-dynamic-range (HDR) mini-LED backlit LCDs significantly boost the image quality and brightness and reduce the power consumption for VR displays. Such a light engine is particularly attractive for compensating the optical loss of pancake structure to achieve compact and lightweight VR headsets. On the other hand, high-resolution-density, and high-brightness liquid-crystal-on-silicon (LCoS) is a promising image source for the see-through AR displays, especially under high ambient lighting conditions. Meanwhile, the high-speed LCoS spatial light modulators open a new door for holographic displays and focal surface displays. Finally, the ultrathin planar diffractive LC optical elements, such as geometric phase LC grating and lens, have found useful applications in AR and VR for enhancing resolution, widening field-of-view, suppressing chromatic aberrations, creating multiplanes to overcome the vergence-accommodation conflict, and dynamic pupil steering to achieve gaze-matched Maxwellian displays, just to name a few. The operation principles, potential applications, and future challenges of these advanced LC devices will be discussed.

show abstract

Section: Lcds For Vrmentioning

confidence: 99%

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The stains can be classified into four types according to gray level and brightness mode. In this study, except other three types of stains beyond the mid gray and luminance which are caused by various reasons from such as OLED process [31][32][33], IR drop [34][35][36][37] or TFT process [25]. We focus on the stain ( 4 ) that can occur in 10 gray scale images with 500-nit brightness, and in 32 gray scale images with 2-nit brightness.…”

Section: Types Of Display Quality Deteriorationmentioning

confidence: 99%

Enhancement of picture quality on ultra-low brightness by optimizing the electrical potential required for OLED charging in the AMOLED displays

Min

Kim³

et al. 2021

Journal of Information Display

View full text Add to dashboard Cite

The principal causes of the poor picture quality on active matrix organic light-emitting diode (AMOLED) displays, operating under extremely low brightness and gray-scale conditions, were analyzed and verified by measuring and modelling of the electrical simulations. Through the analysis, it was found that the deteriorated picture quality was induced by a delayed saturation voltage, which means the electric potential difference between the initial voltage applied to the anode of the OLED (V init ) and the OLED saturated voltage (V sat ) for emission. This is because the deviations of pico-ampere-level currents and delayed OLED charging prior to light emission increased the saturation voltage when there were low driving currents. Thus, we optimized the voltage by increasing V init from −4.5 to −2.7 V, effectively eliminating image deterioration by reducing the OLED charging delay. Thus, the proposed approach opens up advancements of obtaining superior picture quality with ultra-low luminance, even in the dark illuminance environments. We discuss how OLED picture quality may be enhanced under low brightness, including the driving methods, design considerations, and processes involved.

show abstract

“…The display industry is approaching asymptotic limits in the performance of existing backplane technology. The following needs are becoming increasingly apparent [1][2][3][4][5] :…”

Section: Introductionmentioning

confidence: 99%

“…The display industry is approaching asymptotic limits in the performance of existing backplane technology. The following needs are becoming increasingly apparent 1–5 : image refresh rates > 120 Hz for increasing image quality; reduced power consumption for increasing screen time on mobile devices; reduced pixel circuit area for increasing display resolution; simplified backplane fabrication processes for increasing output capacity and panel yield; and reducing sensitivity to photolithographic alignment for manufacturing large‐area flexible displays. Complementary metal‐oxide semiconductor (CMOS) very large‐scale integration (VLSI) manufacturing faced similar challenges as “Moore's Law” appeared to have reached its limits in the late 1990s 6 . Innovations in device structure and gate materials, rooted in a fundamental understanding of device theory, extended the life of “Moore's Law” by 20 years through fin field‐effect transistor (FinFET) technology.…”

Section: Introductionmentioning

confidence: 99%

Innovations in thin‐film electronics for the new generation of displays

Zeumault,

Mendez,

Brewer

2024

J Soc Info Display

View full text Add to dashboard Cite

Today's display industry faces transistor‐level challenges similar to those of complementary metal‐oxide semiconductor (CMOS) metal‐oxide semiconductor field‐effect transistors (MOSFETs) in the mid‐1990s. Learnings from MOSFETs inform the display industry's response to the limitations of silicon‐based thin‐film transistors (TFTs). Improvements sustaining Moore's Law drove the need to rethink MOSFET materials and structures. The display industry needs fundamental innovation at the device level. New thin‐film devices enable an inflection point in the use of displays, just as fin field‐effect transistor (FinFET) defined the inflection point in CMOS in the 2000s. This paper outlines two innovations in thin‐film device technology that offers improvement in image quality and power consumption of flat panel displays: amorphous metal gate TFTs (AMeTFTs) and amorphous metal nonlinear resistors (AMNRs). Linked through a single core material set based on mass‐producible, thin‐film amorphous metals, these two innovations create near‐ and long‐term roadmaps simplifying the production of high‐image quality, low‐power consumption displays on glass (now) and plastic (future). In particular, the field‐effect mobility of indium gallium zinc oxide (IGZO) AMeTFTs (55–72 cm2/Vs) exceeds that of IGZO TFTs developed by existing display manufacturers without the need for atomic layer deposition or vertical stacking of heterostructure semiconductor films, making AMeTFTs a natural choice for the new G8.5–G8.7 fabs targeting IGZO backplanes.

show abstract

27.2: Invited Paper: High resolution FMM process for AMOLED displays

Abstract: Fine metal mask (FMM) is one of the biggest hurdles to realize high resolution AMOLED displays for smartphone and virtual reality (VR). Various kinds of the material and processing technologies for high resolution FMMs are discussed.

Cited by 7 publications

References 4 publications

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

Enhancement of picture quality on ultra-low brightness by optimizing the electrical potential required for OLED charging in the AMOLED displays

Innovations in thin‐film electronics for the new generation of displays

Contact Info

Product

Resources

About