The paper discusses the available contrast ratio on television screens of the aluminised and non-aluminised types, and indicates the reduction in contrast due to direct illumination of the dark portions of the picture by the bright portions, halation in the glass envelope and external illumination. The results show that picture contrast ratio may be reduced by these effects from about 150: 1 under the best conditions to 25: 1 under typical domestic viewing conditions.
Experiments in television picture viewing with illuminated surrounds are described and curves given relating picture luminance with the surround luminance giving greatest viewing comfort for three sizes of surround.
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References
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StuderF. J., and CusanoD. A.J.O.S.A., 45, No. 7 (1955).
