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Horizontally the DIN standard recommends horizontal viewing angles (i.e. viewing positions) to be within ±45o and within ±30o vertically. Again this depends on the actual application. For example the height of the image will depend on the seating layout!
Use the word ‘brightness’ carefully! Brightness refers to how we perceive luminance; it is not a scientific term. It’s hard to use the English language without using ‘brightness’ – even in this document! – but nevertheless be aware of the subjective associations of using this word.
Image ‘brightness’ and obtainable contrast ratios are the fundamentals for image quality.
As can be seen from the way the eye works, the image luminance (‘brightness’) and contrast ratio must be selected based on the average adaptation level in the specific application.
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