Hosiden (Japan)

It becomes clear that the predominant cause of the formation of circumferential residual stresses in cylindrical drawn cups is the axial unbending of the wall element of the product at the exit of the die. The theoretical distributions of residual stresses through the wall thickness are calculated by the elasto-plastic finite element method and compared with the experimental results of mild steel products. It is also shown that the magnitude of the residual stresses near the inner surface at the middle part of cup wall is great enough to satisfy the yield condition of material.

The effect of postannealing on surface potential stability was investigated for silicon dioxide (SiO 2) electret thin films with a thickness of 2 to 5 µm. The SiO2 films were prepared on Al-coated and uncoated Si substrates by r.f. magnetron sputtering using a fused quartz target. Subsequent to the sputter deposition, the SiO2 films were postannealed in the deposition chamber in order to improve stability for use in a highly humid atmosphere. The obtained surface potential stability was dependent on not only the postannealing conditions but also the deposition conditions. The surface potential of SiO2 films postannealed in an oxidizing atmosphere at 275 to 350 ◦ C for 10 to 60 min was found to be highly stable when tested at a relative humidity of 90% and a temperature of 60 ◦ C. In addition, the postannealed SiO2 films were stable for use in air for a long term at room temperature.

Abstract We studied the design rules of the reflective type liquid crystal display (LCD) and the retardation films in order to prevent the color shift and the change of the reflectance. By analyzing the polarized state of light after passing through the LCD, and excellent reflective LCD, which shows almost constant reflectance in wide viewing angle without color shift by using the twist liquid crystal cell.

We have developed a wide-viewing-angle normally black full-color active matrix liquid crystal display (TFT-LCD) for a new type of passenger plane cockpit. The cockpit has six large-size displays (DU) with 6.71 × 6.71-inch active area and three medium-size displays (CDU) with 3.72 × 3.25-inch active area and is called a “glass cockpit.” The cockpit display is extremely important equipment in the interface between pilot (man) and airplane (machine). This paper describes the required performance for the cockpit display, the key technology to realize this performance, the performance of the developed wide-viewing-angle full-color TFT-LCD, and a comparison with CRTs. © 1998 Scripta Technica. Electron Comm Jpn Pt 2, 80(12): 18–29, 1997

Recent development and application of TFT-LCDs using a-Si TFT are reviewed. An in-plane- switching (IPS) mode LCD is expected to be the most promising among many candidates for economically improving the poor-viewing angle in an LCD. Our practically-unlimited viewing-angle 14.5-inch IPS TFT-LCD prototype is described, which has XGA resolution and 64-gray-scale capability. An aircraft cockpit display requires a wide viewing-angle, wide operating-temperature, and high readability. Our large-size and full-color TFT-LCD under production as a cockpit display for new types passenger plane is described. A large-size reflective-color TFT-LCDs prototype fabricated through our high-aperture-ratio technology and minimized-production process is describe. A reflective TFT-LCD is very suitable for reducing power consumption. Additionally, performance and characteristics of other TFT- LCD prototypes and products are described.