A Study on Alignment Process of Ion Beam Irradiation to Improve LCD Productivity in Electric Installation Application
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ORIGINAL ARTICLE
A Study on Alignment Process of Ion Beam Irradiation to Improve LCD Productivity in Electric Installation Application Hak‑Ryong Moon1 · Jeong Min Han2 · Hyun‑Jae Lee3 · Jin‑Geun Shon4 Received: 12 June 2019 / Revised: 18 November 2019 / Accepted: 3 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract In this study, we fabricated TN-LCD using DuoPIGatron ion beam with obliquely irradiated polyimide film and TN-LCD using conventional rubbing method, and compared the electro-optic characteristics. In the TN-LCD using the rubbing method, a pretilt angle of 0.05° was obtained, and it was confirmed that an excellent pretilt angle of 1.13° also occurred in the TN-LCD irradiated with an ion beam. In addition, voltage-transmittance characteristic, which is a characteristic for realizing gray scale, was measured using the TN-LCD manufactured as described above. And, the response time characteristic was measured as a basic feature to compose a screen without motion blur. As a result, both the TN-LCD using the rubbing method and the TN-LCD manufactured by ion beam irradiation showed good voltage-transmittance characteristics in the driving voltage range of 1.5–3.5 V. In particular, as a result of measuring the response time characteristics, the light-on time was measured at 5.11 ms and the light-off time was measured at 10.98 ms. This is a very good result at the level of TN-LCD without chiral dopant, which can be evaluated as comparable with the result of the production level. Keywords DuoPIGatron · Ion beam · Liquid crystal alignment · Polyimide thin film · Pretilt angles · Twisted nematicliquid crystal display (TN-LCD)
1 Introduction Recently, with the development of ICT (Information and Communication Technology), the demand of user-oriented information terminals is continuously increasing, and * Jin‑Geun Shon [email protected] Hak‑Ryong Moon [email protected] Jeong Min Han [email protected] Hyun‑Jae Lee [email protected] 1
Department of Future Technology and Convergence Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
2
Department of Electrical and Electronic Engineering, Gachon University, Seongnam, Korea
3
Department of Electrical Engineering, Seoil University, Seoul, Korea
4
Department of Electrical Engineering, Gachon University, Seongnam, Korea
demand for smart phones and tablet PCs, which can be carried by existing large-sized televisions (TV) and home-based information terminals, is increasing. The market demand for the information display device is continuously increasing due to the surge of the demand of the information terminal, and the main axis of the information display device is the liquid crystal display (LCD). The most serious problem in a general LCD manufacturing process is to achieve a uniform alignment state of the liquid crystal molecules constituting the basic screen display, and in order to achieve this, a rubbing method which is a physical contact method has been mainly used [1, 2]. However, such a ru
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