Electrical testing of the OLED matrix for analyzing defects in a PMOLED display

Uttwani, Pankaj Kr; Awasthi, Ashish; Solanki, Ankur; Rao, I. V. Kameshwar

doi:10.1117/12.926781

Cited by 2 publications

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“…After de-bonding, the flexible substrate is bended 1000 times with the radius of 10 cm without any crack. Moreover, Uttwani et al 13 investigated a small OLED matrix by creating defects deliberately to study the possible visual manifestations in a PMOLED display using a cathode ray oscilloscope (CRO).…”

Section: Classification Of Oledmentioning

confidence: 99%

Review—Advancements and Perspectives of Organic LED: In Depth Analysis of Architectural Design, Characteristics Parameters, Fabrication Techniques, and Applications

Yadav

Mittal

Negi

2023

ECS J. Solid State Sci. Technol.

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This article presents a review on various aspect of organic light emitting diodes (OLEDs), such as their working, various categorization, impact of fabrication methodologies (organic vapor phase deposition, vacuum thermal evaporation, inkjet printing etc.) that are low-cost and their applications in serval domains like medical, sensor, display, lighting etc. Three categorizations of OLED are discussed with respect to circuit, architecture and color of emission. Different layers of multi-layered structures such as injection layer, transport layer, block layers are also reviewed and their impacts are analyzed and compared. Moreover, an experimental fabrication technique for flexible substrate is reviewed that highlights low-cost fabrication method. In this technique, dynamic viscosity and contact angle are measured using rotational viscometer and contact angle meter, respectively. The result illustrates sheet resistance and effective opening ratio of 3.8 ohms per square and 82.5%, correspondingly. Additionally, various performance parameters like luminescence, external quantum efficiency, and current efficiency are compared. The paper also incorporates recent advancement in organic thin film transistors along with some OTFT driven OLED devices.

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Section: Classification Of Oledmentioning

confidence: 99%

Review—Advancements and Perspectives of Organic LED: In Depth Analysis of Architectural Design, Characteristics Parameters, Fabrication Techniques, and Applications

Yadav

Mittal

Negi

2023

ECS J. Solid State Sci. Technol.

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“…However, the lower yield, which is especially due to the processing defects, is still a main concern which adversely affects the OLED display cost [6,7]. During the fabrication and operation of the display panel, different kinds of defects develop, which lead to a defective display with lower luminescence, poor contrast ratio and short panel lifetime [8][9][10][11][12][13][14]. To date, various approaches, such as machine learning [15], cascaded Mura detection [16] and independent component analysis [17], have been employed for their determination and removal from display panels.…”

Section: Introductionmentioning

confidence: 99%

An efficient and facile method to develop defect-free OLED displays

Solanki

Awasthi

Unni

2021

Semicond. Sci. Technol.

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Organic light emitting diodes (OLEDs) have captured the attention of the flat-panel display market owing to their high luminescence and versatile properties. However, substrate processing plays a critical part in the fabrication of OLED displays, demonstrated here as a passive matrix display, where plenty of defects, which appear during the processing stage, result in poor display quality and yield. Photolithography is the most common technique used to develop the electrode pattern on a transparent glass substrate. Nevertheless, poor lithography leads to display defects such as dead pixels, dark columns and bright horizontal rows. Moreover, shorts between anodes due to partial etching of the transparent conducting material or cathode lines are also common problems. Herein, we discuss a technique which drastically reduces the number of electrode shorts. Selective etching of the cathode in this technique makes the optical inspection of electrode shorts far easier due to the higher contrast ratio between Cr/glass compared to indium tin oxide/glass. Further, a focused laser beam is employed to ablate the identified shorts between two or more anode/cathode lines to make the short-free patterns. Additionally, a laser beam is also capable of isolating the burnt/dead pixels in a display, which otherwise lead to dark or bright lines during operation. Thus, our findings are very important for the display industry to develop defect-free panels and for the repair of certain operational defects to increase the production yield and lifetime.

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Electrical testing of the OLED matrix for analyzing defects in a PMOLED display

Cited by 2 publications

References 0 publications

Review—Advancements and Perspectives of Organic LED: In Depth Analysis of Architectural Design, Characteristics Parameters, Fabrication Techniques, and Applications

Review—Advancements and Perspectives of Organic LED: In Depth Analysis of Architectural Design, Characteristics Parameters, Fabrication Techniques, and Applications

An efficient and facile method to develop defect-free OLED displays

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