Hideaki Tsuda

41.1: A Super-High Image Quality Multi-Domain Vertical Alignment LCD by New Rubbing-Less Technology

An MVA-LCD (multi-domain vertical alignment LCD) that provides super-high image quality has been developed by newly introduced rubbing-less technology. A newly introduced “protrusion” designed on the TFT substrates and on the color filter substrates automatically controls the directors of the LC molecules. By this technology we have successively developed four-domain 15″ MVA-TFT units that provide extremely wide viewing angle of more than 160 degrees, a high contrast ratio of 300:1 or more and a fast response of less than 25ms.

39.4: A New MVA‐LCD with Jagged Shaped Pixel Electrodes

We have developed a new MVA-LCD with fast gray-scale response characteristics. The newly designed jagged shaped pixel electrodes give the oblique electric field and effectively control the LC alignment not only statically but also dynamically. We have realized the response time of 30ms (1/3 of the conventional MVA) for any gray-scale switching keeping other advantageous characteristics same; CR, viewing range etc.

A full-color TFT-LCD with a polymer-dispersed structure

— A direct-view TFT-LCD with a wide viewing angle, which uses a polymer-dispersed liquid-crystal panel and a pair of polarizers, is proposed. The device has a vertical viewing-angle range of 120°, with a contrast ratio over 5:1 without display-image reversal. This is about three times the twisted-nematic displays viewing-angle range.

Effects and Structural Model of Surfactants on the Hysteresis Behavior of Polymer Dispersed Liquid Crystals

Abstract There are numerous reports in the literature dealing with the electro-optical properties of PDLC with experiments designed to reduce the materials hysteresis. Most suggest strong interaction relationship between the liquid crystals and the polymeric materials. We present the approach of correlating the hysteresis behavior of the PDLC films with the interaction of surfactants at the material interface. Experimental results and structural model will be described.

Direct-view polymer-dispersed LCD with crossed Nicols and uniaxial film

— By adding a uniaxial retardation film and using a chlorinated LC mixture, the performance of polymer-dispersed LCDs with crossed Nicols (PDN-LCDs) was improved. A wide viewing angle of more than 60° (contrast ratio >5) for all azimuth directions was obtained. In the horizontal and vertical viewing azimuth, the contrast ratio was over 30 even at an inclination viewing angle of 60°.

A Full-Color Direct-View TFT-LCD with a Polymer-Dispersed Structure.

We propose a direct-view TFT-LCD with a wide viewing-angle which uses a polymer-dispersed liquid-crystal panel and a pair of polarizers. We call this device a polymer-dispersed LCD with crossed Nicols (PDN). The PDN allows panels to be made with low scattering levels.This suggests the use of fluorinated liquid crystals (F-LC) that show a high voltage-holding ratio in TN-LCDs. We found that F-LCs show good solubility with resins having low solubility parameters. A voltage-holding ratio of over 98% is shown, which is almost equal to the value for TN-LCD. The vertical viewing range exceeds ±60°, with a contrast ratio of over 5 and no image reversal. The range is almost three times the TN-LCD value. Molecular alignment is symmetrical and the variation of overall retardation is suppressed. The TFT-LCDs fabricated show a high contrast ratio and no imag reversal at any viewing angle.