ガウス関数重み付け法によるカラーＣＲＴ上複合ラスタモアレパターンの統一的評価

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  • Evaluation of Combined Raster Moire Patterns on Color CRTs Using a Gaussian-Weighting Method.
  • ガウス カンスウ オモミヅケ ホウ ニ カラー CRT ジョウ フクゴウ ラスタ モアレ パターン ノ トウイツテキ ヒョウカ

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To reduce raster moire fringes appearing on color CRTs, a technique to simulate moire patterns is needed. Although it is necessary to know the moire pattern appearing on the entire screen of a CRT, the Fourier analysis technique can be used only for a small area where the parameters can be assumed to be uniform. Because there are many different moire modes, we need different methods to simulate the moire patterns. Therefore before doing a simulation, we must identify the mode. In this respect it is difficult to simulate patterns consisting of combined modes. Also, slot-type shadow masks and dot-type shadow masks must be evaluated and analysis should be performed for any electron beam profile. In this paper, a Gaussian-weighting method is described for moire evaluation. In the method, the luminance of phosphor dots around a particular central dot is weighted depending on the distance from the central dot, which simulates the characteristics of a human eye. By using the method, moire patterns of various modes, including combined modes, can be simulated for the entire screen area.

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