Yasutoshi Tasaka

3.1: MVA LCD for Notebook or Mobile PCs with High Transmittance, High Contrast Ratio, and Wide Angle Viewing

We have developed a new MVA-LCD with high transmittance comparable to a TN-LCD. We stacked a pair of quarter wave plates and stabilized the molecular alignment by dividing each pixel and arranging fine slits and nipple-shaped protrusions. The quality affordable for desk-top monitor is realized for mobile display.

23.1: Fast-Switching LCD with Multi-Domain Vertical Alignment Driven by an Oblique Electric Field

We have developed a novel fast-switching LCD with multidomain vertical alignment driven by an oblique electric field. The oblique electric field is applied between comb-shaped source electrodes and comb-shaped common electrodes on a TFT substrate and an ITO electrode on a CF substrate covering the entire display area. The ITO electrode is covered by a dielectric layer. The LCD has a wide viewing range (>160°), a high contrast ratio (>250:1) and fast response times even in black-and-white (13 ms (rise), 4 ms (decay)), and gray-scale (<17 ms) switching. The LCD has no problems with electrostatic charge, disclination, or slow gray-scale switching.

Vertically Aligned TFT-LCDs

Fujitsu has developed several types of vertically aligned TFT-LCD: with protrusion; with photo-alignment; and with comb-shaped electrodes. The protrusion-type TFT-LCD has the best balance of specifications and is in mass- production. It has a transmittance of 5% for a 15-inch XGA LCD, a response of 25 ms (τon + τoff), and a contrast ratio of over 400. The photo-aligned type gives highest transmittance (7.5%) with dual domains. The lamp for UV irradiation can be a tube type and non-polarized UV is possible. We think it is a good candidate for notebook-type applications. The comb-shaped electrode type has the fastest response of better than 17 ms for any gray-scale switching. We think it is a good candidate for video applications.

20.1: Dual‐domain Vertically Aligned TFT‐LCD Developed by Irradiation with Unpolarized UV Light from a Tube‐type Light Source

We have developed a dual-domain vertically aligned TFT-LCD by irradiation with unpolarized UV light from tube-type light source. We reduced disclination by fabricating protrusions and by optimizing the alignment material. The transmittance of a 15-inch diagonal TFT-LCD is twice that of IPS LCD, 1.5 times that of conventional MVA-LCD and 1.1 times that of TN-LCDs with Wide-View film.