Optical characterization of the in-plane switching effect utilizing multidomain structures

Abstract

Color shift and gray scale reversal for very large viewing angles are analyzed theoretically for in-plane switching. It follows that the color shift depends on the change of the effective birefringence dΔn, whereas gray scale reversal depends on the effective angle between the polarizers and the liquid-crystal director angle. Experimental results confirmed the theory that small gray levels result in a larger color shift. Likewise, the viewing angles in which a gray scale reversal occurs, correlate with the theory. To counter these drawbacks, two multidomain structures are proposed, neither of which requires additional orientation processes. With these multidomain structures, color shift was suppressed and no gray scale reversal was observed. However, the multidomain structures reduce maximum transmission, the extent of which depends on the type and design of the structure.

Electrically controlled director slippage over a photosensitive aligning surface; in-plane sliding mode

“…The white colour shift can be suppressed by using a multi-domain the driving voltage, while at the same time increasing the response time. However, the increase in the response structure with a chevron-like electrode structure [13,14]. To improve the low brightness of the IPS LCD, Kelly time can be compensated by a proposed optimization of the LC cell design.…”

Bending Angle Effects on the Multi-Domain in-Plane-Switching Liquid Crystal Displays

“…4(b), the VT curves are similar to those of the conventional IPS mode, except for a slightly higher on-state voltage (5 V ) and a slightly lower maximum transmittance (27.8%). The % decrease in maximum transmittance is due to the multidomain formation [29], [30], which lowers the effective phase retardation. Fig.…”

“…That is to say, the white color shift occurs when changes. Klausmann et al [29] have investigated the color shift problem of a conventional IPS mode and found that for the rotated LC directors with an oblique angle parallel to the optical axis, the maximum value of occurs at a shorter wavelength. That means the intended green color shifts toward blue range.…”

Wide Viewing Angle Multi-domain In-Plane Switching LCD

“…In order to eliminate the color shift phenomenon in IPS mode, the multi-domain (MD) IPS LCD has been proposed using the zig-zag shaped electrodes or W-shaped electrodes, where the bending angle of the electrodes are usually at 2-15 [10,11]. In this paper, we investigate the bending angle effect on a MD IPS using the chevron-shaped electrodes through a three-dimensional numerical simulation.…”