Journal
OPTICS AND LASERS IN ENGINEERING
Volume 137, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2020.106381
Keywords
Femtosecond laser trimming; Electrode printing followed by femtosecond laser trimming; OLED display panel repair; Printed electrode; Electrical conductivity
Categories
Funding
- Eurostars2 project - Ministry of Trade, Industry and Energy (MOTIE, Korea) [N055700001]
- Center for Advanced Soft-Electronics - Ministry of Science, ICT and Future Planning, Korea [CASE-2016M3A6A5929198]
- Nano-Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018M3A7B4069995]
- Basic Research Fund of the Korea Institute of Machinery and Materials [NK224E, NK226A]
- National Research Council of Science & Technology (NST), Republic of Korea [NK226A, NK224E] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018M3A7B4069995] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Femtosecond laser ablation has been used in OLED panel repair for the past decade, primarily for modifying organic materials without thermal effects. To increase production yield, additive repair techniques using electrode printing and femtosecond laser trimming have been suggested to increase electrical conductivity of printed electrodes.
In OLED panel repair process, femtosecond laser ablation has been adopted for last 10 years. Because femtosecond laser process can be performed with negligible thermal effect, it is suitable for modifying the organic materials whose lifetime is negatively affected by heat. Because of it, femtosecond laser ablation process has been applied to repair process of OLED panel such as elimination of internal debris, disconnection of over connected electrodes, and etc. However, it has been limitedly applied to certain types of defects. In order to increase a production yield, various types of defects should be treated. Thus, additive repair process needs to be developed. In last few decades, various research groups have been developing electrode printing techniques. But it is very hard to print an electrode with width of 1 mu m scale so far. Therefore, we suggest new repair technique that combines additive and subtractive methods. It is the technique that conducive material is printed with width of few micrometers scale followed by femtosecond laser trimming with width of 1 mu m scale. During an electrode printing followed by femtosecond laser trimming (EPFLT) process, we could enhance electrical conductivity of printed electrode. After EPFLT process, the average electrical conductivity of electrodes increases from 1.51x10(7) S/m to 2.31x10(7) S/m. Here, we carefully claim that the heat accumulation during a femtosecond laser trimming causes an annealing of printed electrode and the electrical conductivity is enhanced.
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