An autostereoscopic 3D television, which displays 8 views in 1mm pitch of a lenticular sheet in 280mm × 220mm area, and whose image is seen directly on Braun tube without glasses, was demonstrated in 1987. Because the image brightness was rather low in the previous experiment, the images were observed in the dark. Recently, beam index Braun tubes having both high resolution and high brightness was newly provided. Using this tube, real-time autostereoscopic 3D TV images are now observed in ordinary circumstances. Moreover, experiments for improving the image quality are done with higher precision. In this report, important aspects of the improvements including some ideas which have been confirmed during the developments, are explained. Special emphases are on the stabilization and tracking accuracy of the index loop, and the quality of 3D images which are displayed on a cylindrically shaped composite lenticular assembly on the face plate or Braun tube.
For an autostereoscopic 3D TV display seen directly on Braun tube without glasses, it is desirable that Braun tube having curved face plate could be used, because there are established technologies which enable deflection and focusing of an electron beam with higher precision. But, little are known about the structure of observer's space supplied with such a shaped lenticular sheet fitting over a curved face plate of Braun tube. Recently, experimental observations have been done by using a high resolution beam-index Braun tube having a composite lens-plate which is shaped along the curved surface of the tube. This paper explains the conditions which are required for the display space to be suitable for autostereoscopic 3D images. Using a mathematical model of the composite lens-plate and approximate values of parameters of the experimental lens-plate and Braun tube, characteristics of the space are numerically investigated. Preliminary results reveal that the space having an equivalent projection lens array behind the face of the composite lens-plate can be obtained, as was experimentally observed. The influences of lenslet defocusing and lenslet aberrations are numerically explained.
Electron emission distribution of (W-Sc_2 W_3 O_<12>)-coated impregnated cathodes is evaluated. The distribution is much larger than that of Os-coated impregnated cathode. The high electron emissive areas are correspond to the regions of the pore sections in which impregnants exist. The distribution is not changed by heating the cathode up to 950℃_b. It might be modeled that Sc_2W_3O_<12>, Sc_2O_3 or Sc prevents the surface diffusion of Ba, and then makes the high Ba concentration area where the work function is low.
Very fine resolution SD-PDPs with a cell pitch 0.1 mm were fabricated. These panels showed excellent results in terms of brightness and luminous efficiency which have the same advantages as those with a larger cell pitch. From these results, it is proved that the configuration of surface-discharge ac plasma displays are the most prospective flat panel displays for use in fine resolution display for CAD and CAM.
We introduce an ac-PDP with new electrode structure. It has upper electodes on barrier ribs. We investigate the luninous chararcteristics of the barrier electrode type PDP and obtain high luminance and luminous efficiency. And we analyze the operating mechanics with computer simulation.
This paper introduces the program of the 1990 TRI-SERVICE/NASA CATHODE WORKSHOP which was held in Cleveland Ohio on April 3-5th 1990,and briefly reviews the contents. New cathode technologies are anticipated to be capable of current densities of 100A/cm^2 and long life characteristics of 25 years over.
Magnesium oxide is generally recognized as a stable overcoat material for ac plasma display panels. However, the electrical characteristics of the panel are a sensitive function of the surface properties of the thin MgO layer, which is in direct contact with the gas. Some contaminants in MgO films are removed by a vacuum bake cycle. The influence of baking process on MgO surfacewere investigated by FTIR, thermal analysis and ESCA.
In order to evaluate Ne+Xe+Kr gas for full-color plasma display panels the density of Xe excited atoms which emits UV rays was measured by the laser-induced fluorescence method. In result, the generation process of the Xe 1s_4 atoms by the resonant excitation transfer between Kr excited atoms and Xe ground-state atoms was conceivable. And the characteristics of the panel filled with the gas were investigation. The luminous efficiency was improved. The influence of the resonant excitation transfer was conceivable as one of the reasons for the improvement.
An one-dimensional simulation code for temporal discharge in He-Xe mixture was developed to analyze the characteristics of color Plasma Display Panels(PDPs). The implicit exponential scheme for the continuous equations was adopted to reduce the calculation time and to facilitate a multi-dimensional approach in future. An agreement with a two-region scheme was satisfactory. Calculated results were compared with those of experiments for Xe147nm and Xe_2^* 173nm radiation, and good agreement was found.
DC-type multicolor plasma display panels were fabricated. Conductive phospher layers with In_2O_3 powder were screen-printed on the ITO anode electrode which was formed on the window glass. Filter layer was fabricated to improve contrast by improving purity of luminous light and suppressing reflection of outside lighting. Newly developed cathode electrode. ZnO thick film, made mercury unnecessary and showed superior red chromatlcity.