New Pixel Design on Emitting Area for High Resolution Active-Matrix Organic Light-Emitting Diode Displays

Hong, Soon-Kwang; Sim, Jea-Ho; Seo, In-Gyo; Kim, Keun-Choul; Bae, Sungil; Lee, Heeyoung; Lee, Nam-Yang; Jang, Jin

doi:10.1109/jdt.2010.2063694

Cited by 25 publications

(8 citation statements)

References 9 publications

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“…And each one was 1/6 of the hexagonal area. Similar approaches that dividing pixels with same color into 2, 3, or 4 have been reported by other researchers, while in our hexagon pixel design, each subpixel is individually addressable, which enables high ppi display at the current inkjet printing conditions.…”

Section: Discussionsupporting

confidence: 56%

Real RGB printing AMOLED with high pixel per inch value

Huo

Shao

Dong³

et al. 2020

J Soc Info Display

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A 403‐ppi (pixel per inch) real RGB active‐matrix organic light‐emitting diode (AMOLED) was fabricated without using fine metal mask (FMM). Organic light‐emitting materials were printed on array panel, with a novel process that has the advantages of low cost and high pixel density. The uniformity of the organic light‐emitting diodes (OLEDs) was improved with carefully tuning printing parameters, and good panel performance was achieved. The key to such a process was the design of the hexagonal patterning of the pixels. The image quality of the panel with this hexagonal pixel arrangement was evaluated with a bmp format Pixel Layout Simulation picture.

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Section: Discussionsupporting

confidence: 56%

Real RGB printing AMOLED with high pixel per inch value

Huo

Shao

Dong³

et al. 2020

J Soc Info Display

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“…Usually, the opaque thin film transistor (TFT) array is manufactured on the substrate before the deposition of the materials of the OLED. For this reason, a top-emitting OLED (TOLED) is preferable for AMOLED structures [5,6]. Furthermore, in the top-emission architecture, the light is not trapped in the substrate with advantages in the light outcoupling [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Flexible distributed Bragg reflectors as optical outcouplers for OLEDs based on a polymeric anode

Prontera

Pugliese

Giannuzzi

et al. 2020

Journal of Information Display

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Top-emitting OLEDs (TOLEDs) represent a promising technology for the development of nextgeneration flexible and rollable displays, thanks to their improved light outcoupling and their compatibility with opaque substrates. Metal thin films are the most used electrodes for the manufacturing of TOLEDs, but they show poor resistance to mechanical deformation, which compromises the long-term durability of flexible devices. This paper reports the exploitation of a dielectric mirror (DBR) based on seven pairs of TiO 2 and SiO 2 combined with a polymeric electrode as an alternative to the bottom metal electrode in flexible TOLEDs. The DBR showed a maximum reflectivity of 99.9% at about 550 nm, and a stop-band width of about 200 nm. The reflectivity remained unchanged after bending and treatment with water and solvents. Green TOLED devices were fabricated on top of DBRs, and demonstrated good stability in terms of electro-optical and colorimetric characteristics, according to varying viewing angles. These results demonstrate that the combination of the flexible DBR with the polymeric anode is an interesting strategy for improving the durability of flexible TOLEDs for display applications, implemented on different kinds of free-standing ultra-thin substrates.

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“…[17][18][19][20][21][22] Moreover, the light-emitting efficiency can be significantly enhanced, because in top-emitting structures, the emission layers are sandwiched between a reflective bottom electrode and a semi-transparent top electrode; by optimizing the cavity length, light reflected from the top electrode and that from the bottom electrode interferes with each other constructively, and as a result, the emission is greatly sharpened and enhanced. Thus the top-emitting structures are widely used to improve the color saturation and enhance the efficiency of OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Very Bright and Efficient Microcavity Top-Emitting Quantum Dot Light-Emitting Diodes with Ag Electrodes

Liu

Zhou

Chen

2016

ACS Appl. Mater. Interfaces

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The microcavity effect in top-emitting quantum dot light-emitting diodes (TQLEDs) is theoretically and experimentally investigated. By carefully optimizing the cavity length, the thickness of the top Ag electrode and the thickness of the capping layer, very bright and efficient TQLEDs with external quantum efficiency (EQE) of 12.5% are demonstrated. Strong dependence of luminance and efficiency on cavity length is observed, in good agreement with theoretical calculation. By setting the normal-direction resonant wavelength around the peak wavelength of the intrinsic emission, highest luminance of 112 000 cd/m(2) (at a driving voltage of 7 V) and maximum current efficiency of 27.8 cd/A are achieved, representing a 12-fold and a 2.1-fold enhancement compared to 9000 cd/m(2) and 13.2 cd/A of the conventional bottom emitting devices, respectively, whereas the highest EQE of 12.5% is obtained by setting the resonant wavelength 30 nm longer than the peak wavelength of the intrinsic emission. Benefit from the very narrow spectrum of QDs and the low absorption of silver electrodes, the potential of microcavity effect can be fully exploited in TQLEDs.

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New Pixel Design on Emitting Area for High Resolution Active-Matrix Organic Light-Emitting Diode Displays

Cited by 25 publications

References 9 publications

Real RGB printing AMOLED with high pixel per inch value

Real RGB printing AMOLED with high pixel per inch value

Flexible distributed Bragg reflectors as optical outcouplers for OLEDs based on a polymeric anode

Very Bright and Efficient Microcavity Top-Emitting Quantum Dot Light-Emitting Diodes with Ag Electrodes

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