Visibility Evaluation of the Inverse-Phase CRT Raster Moire Pattern(Special Issue on Electronic Displays)

概要

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Reducing moire is an important consideration in CRT design. This paper aims to investigate how the visibility of the inverse-phase raster moire, a typical pattern of the raster moire, is influenced by the distribution of the electron beam and the structure of shadow mask apertures. First, a simple model based on the luminance distribution on the CRT screen and characteristics of the human vision was used to calculate the perceived intensity of the inverse-phase raster moire. This calculation was made to examine the effect of model parameters. It showed that the inverse-phase raster moire consists of(1, 1)-order moire components. It was also found that the perceived intensity increases with a decrease in electron beam diameter and with an increase in horizontal aperture pitch. In addition, a subjective evaluation test was conducted using an inverse-phase moire pattern reproduced by the image simulation. Test results agreed with the calculated results. Finally, it was revealed that when an electron beam shape having a Gauss distribution was used, most of the raster moire is the inverse-phase raster moire caused by the(1, 1)-order component, while the(2, 2)-order moire component was very low.
社団法人電子情報通信学会の論文
2000-10-25