LCD Processing and Testing

Yamamoto, Yoshitaka

doi:10.1007/978-3-642-35947-7_98-2

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…In the capillary filling method, the two parallel plates are first fixed together so that there is a prescribed gap between them. The liquid crystal is then introduced into this gap by capillary forces, usually under a vacuum, until the device is filled [1][2][3]. For standard liquid crystal materials and device gaps (typically less than 10 microns), the relatively long time-scale of capillary filling (typically 1 to 2 days [2,4]) means that using this method can be a key factor limiting the rate of device production.…”

Section: Introductionmentioning

confidence: 99%

“…For standard liquid crystal materials and device gaps (typically less than 10 microns), the relatively long time-scale of capillary filling (typically 1 to 2 days [2,4]) means that using this method can be a key factor limiting the rate of device production. In the ODF method, an array of drops of the liquid crystal are placed on one of the plates, here called the substrate, and the second plate, here called the top plate, is lowered into position, squeezing the drops until they coalesce to form a continuous film which fills the device [3,5]. The motion of the top plate is stopped when the required gap between the plates is attained.…”

Section: Introductionmentioning

confidence: 99%

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Squeezing a drop of nematic liquid crystal with strong elasticity effects

et al. 2019

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The One Drop Filling (ODF) method is widely used for the industrial manufacture of liquid crystal devices. Motivated by the need for a better fundamental understanding of the reorientation of the molecules due to the flow of the liquid crystal during this manufacturing method, we formulate and analyse a squeeze-film model for the ODF method. Specifically, we consider a nematic squeeze film in the asymptotic regime in which the drop is thin, inertial effects are weak, and elasticity effects are strong for four specific anchoring cases at the top plate and the substrate (namely, planar, homeotropic, hybrid aligned nematic (HAN), and π-cell infinite anchoring conditions) and for two different scenarios for the motion of the top plate (namely, prescribed speed and prescribed force). Analytical expressions for the leading-and first-order director angles, radial velocity, vertical velocity, and pressure are obtained. Shear and couple stresses at the top plate and the substrate are calculated and are interpreted in terms of the effect that flow may have on the alignment of the molecules at the plates, potentially leading to the formation of spurious optical defects ("mura").

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