Title: Measurement of modulation transfer function for cathode ray tubes
Abstract: The measurement of modulation transfer function for cathode ray tube displays is discussed. The problems are considered in relation to the non-linear characteristics of crts, and the consequent importance of making tests under conditions representative of actual applications. A versatile test method is proposed which can be applied to complete tv displays without modification, as well as to separate cathode ray tubes. Avoidance of the fixed-pattern noise contribution introduced by phosphor grain structure allows measurements with low input modulation. An electronic window reduces the crt duty cycle permitting low modulation tests to be carried out over the full dynamic range of the display, without affecting the supplies, or operating high performance crts beyond their mean cathode current density limits. Electronic control makes this method applicable to automatic testing by the addition of a small digital computer. The sensitivity and spatial resolution of the equipment are given. Results are presented to demonstrate the wide range of mtf curves obtained from different crts, and the need for normalization to a sufficiently low spatial frequency.
Publication Year: 1981
Publication Date: 1981-01-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 2
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