Novel in-plane switching liquid crystal display with an extremely high transmittance using a well-designed bottlebrush as a zero-azimuth anchoring material

Abstract

In this study, a one-side zero-azimuth anchoring in-plane switching (OZ-IPS) liquid crystal display (LCD) employing poly(n-hexyl methacrylate) (PHMA) bottlebrush polymers as an application-type zero-azimuth anchoring material was successfully developed. The twist anchoring coefficient A 2 measured for the nematic liquid crystal (NLC) on the PHMA bottlebrush at 25 °C was comparable to that of the same NLC on high-density PHMA brushes. Optimizing the optical design increased the transmission efficiency (TE) of the OZ-IPS cell with the negative NLC to 95%, which was significantly higher than that of conventional IPS cells. Using optical simulation, the OZ-IPS LCDs with a negative NLC clearly exhibited the highest TE (;107% of TN LCDs) for LCDs developed thus far. Moreover, the higher transmittance of the OZ-IPS LCDs was also confirmed for the practical TFT LCD, which exhibited a maximum luminance that was 30% higher than conventional IPS TFT LCDs.

Enhanced thin-film transistor driven high-aperture in-plane switching liquid crystal displays without common line and black matrix

“…IPS TFT-LCD technologies are expected to continuously progress in terms of image quality and energy efficiency through improvements in TFT performance, electrode design, and materials, such as a recently proposed material that can be inserted between the pixel electrodes and the LC to realize high transmittance and a fast response 39 , 40 .…”

Broadband tunable polarization rotator based on the waveguiding effect of liquid crystals

“…Moreover, positive LC is tilted by the vertical component of the electric field near the electrodes, and the twist of the LC molecules is hindered by the strong anchoring energy. In contrast, in an asymmetrically-anchored LC cell, LCs can twist uniformly, and negative LCs tend to twist rather than tilt [20][21][22]. An asymmetrically-anchored LC cell has an almosteven twist distribution in the x-y plane.…”

“…A solution of 1.5 wt% of PMMA in toluene was spin-coated on the bottom substrate at 5000 rpm for 30 s. For strong anchoring, commercial homogenous alignment polyimide, which has a high anchoring energy of E SA ∼ 4 × 10 −4 J m −2 was coated on the top glass substrate by spin-coating at 3000 rpm for 30 s. The cell gap was set as 20 µm to achieve the maximum DoLP at all wavelengths. We chose an LC with negative dielectric anisotropy to achieve uniform rotation of the LC molecules [21]. The physical parameters of LC molecules were the same as the values used in numerical calculations.…”

Preparation and characterization of photo‐decomposable ester‐containing semi‐alicyclic polyimide alignment layers for potential applications in in‐plane switching thin‐film transistor liquid crystal display devices

“…Thin‐film transistor liquid crystal display devices (TFT‐LCD) with high viewing angles and high display quality, such as in‐plane switching (IPS) and fringe field switching (FFS) types of TFT‐LCD have been becoming the dominant products in the market 1–3 . They have been widely used as the panels for portable mobile communication devices, such as mobile phones and tablets, due to the characteristics of fast response speed, wide viewing angles, and low power consumption.…”