Improving VDT workplaces in offices by use of a physiologically optimized screen with black symbols on a light background: basic considerations
Titel:
Improving VDT workplaces in offices by use of a physiologically optimized screen with black symbols on a light background: basic considerations
Auteur:
Bauer, D.
Verschenen in:
Behaviour & information technology
Paginering:
Jaargang 3 (1984) nr. 4 pagina's 363-369
Jaar:
1984-10-01
Inhoud:
. A physiologically optimized bright screen with dark characters has been developed in an effort to eliminate the visual problems and design restrictions which are commonly found in conventional VDTs, as described in numerous publications. It is designed to give a near optimum of visual acuity. Its character sharpness is significantly better than equivalent bright characters on dark backgrounds. By choosing an appropriate black character matrix, screen characters may be made to highly resemble carbon typed characters on a white piece of paper. Inherent problems of the 50-60 Hz dark-background screen—blackness of the background, inappropriate adaptation level, gross level differences between screen and document, sensitivity to specular and diffuse reflections—have been eliminated by a light-background VDT, which is flicker- and jitter-free and which uses correctly designed optics. The experimental unit tolerates source luminances up to 2000 cd/m2 and vertical illumination levels up to around 6000 lx without essential degradation of readability. Consequently, a considerable degree of freedom in designing a VDT workroom is gained: optimum office illumination without restrictions imposed by inappropriate VDUs is possible even in situations where, in one workroom, work which needs high-level illumination and VDT work exist side by side.
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