A Novel Orientation Method for Nematic LCs by Using Magnetic Field Lines with Permanent Magnets and Electric Field for Assisting the Reorientation

Aoyagi, Yoshihiro; Saito, Yuichi; Kudoh, Yukihiro; Takahashi, Taiju

doi:10.36463/idw.2019.0226

Cited by 1 publication

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“…(Crossed Nicols condition using a backlight with white LEDs. Under the AC, applied voltage of 12 V at 10 kHz, without polymerization treatment) 21 …”

Section: Resultsmentioning

confidence: 99%

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A novel radial orientation treatment of nematic liquid crystals using magnetic field lines with permanent magnet and applying the assisted electric field

et al. 2023

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Recently, there has been considerable research on optical devices, such as liquid crystal (LC) lenses and special optical plates, using LCs. In such devices, relatively small LC cells are frequently used, or unique LC orientations are required. As an LC orientation process, we focused on the LC director's orientation induced by the magnetic force line distribution of a small neodymium magnet. We propose a simple method for obtaining radial orientation, which is rather difficult to obtain using the ordinary rubbing method. The initial orientation in the LC cell is a vertical orientation cell with almost zero azimuth anchoring. With the proposed method, the reorientation process is performed with an assisting electric field and a small permanent magnet, unlike the conventional magnetic field orientation process that requires a large electromagnet. Furthermore, a polymer stabilization treatment is used to fix the obtained radial orientation pattern in the LC cell. After the treatment, the applying voltage can control the tilt angle of the director in weak polymer treatment, and a completely fixed orientation pattern can be obtained that in strong.

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“…(Crossed Nicols condition using a backlight with white LEDs. Under the AC, applied voltage of 12 V at 10 kHz, without polymerization treatment) 21 …”

Section: Resultsmentioning

confidence: 99%

“…Crossed Nicols condition using a backlight with white LEDs). 21 F I G U R E 7 Orientation pattern by a rectangular solid neodymium magnet. (20 μm of cell thickness, under the AC, applied voltage of 2.2 V at 1 kHz, without polymerization treatment.…”

Section: In the Case Of Using A Rectangular Solid Magnetmentioning

confidence: 99%