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Proceedings Paper

Practical method for evaluating the visibility of moire patterns for CRT design
Author(s): Naoki Shiramatsu; Masashi Tanigawa; Shuji Iwata
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Paper Abstract

The high resolution CRT displays used for computer monitor and high performance TV often produce a pattern of bright and dark stripes on the screen called a moire pattern. The elimination of the moire is an important consideration in the CRT design. The objective of this study is to provide a practical method for estimating and evaluating a moire pattern considering the visibility by the human vision. On the basis of the mathematical model of a moire generation, precise value of the period and the intensity of a moire are calculated from the actual data of the electron beam profile and the transmittance distribution of apertures of the shadow mask. The visibility of the moire is evaluated by plotting the calculation results on the contrast-period plane, which consists of visible and invisible moire pattern regions based on experimental results of the psychological tests. Not only fundamental design parameters such as a shadow mask pitch and a scanning line pitch but also details of an electron beam profile such as a distortion or an asymmetry can be examined. In addition to the analysis, the image simulation of a moire using the image memory is also available.

Paper Details

Date Published: 24 April 1995
PDF: 8 pages
Proc. SPIE 2408, Liquid Crystal Materials, Devices, and Displays, (24 April 1995); doi: 10.1117/12.207521
Show Author Affiliations
Naoki Shiramatsu, Mitsubishi Electric Corp. (Japan)
Masashi Tanigawa, Mitsubishi Electric Corp. (Japan)
Shuji Iwata, Mitsubishi Electric Corp. (Japan)

Published in SPIE Proceedings Vol. 2408:
Liquid Crystal Materials, Devices, and Displays
Ranganathan Shashidhar; Uzi Efron, Editor(s)

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