![]() Larger screens with higher pixel densities are therefore required for better field of view and better image quality. So there is a trade-off between field of view and image quality. Please note that longer focal lengths INCREASE pixels per degree of view. Screen pixel Density (DPI) => 400 dots per inch Pixels per degree of view = ( lens focal length in inches * screen pixels per inch ) / 57.26 I will use inch units to make the calculation simpler. The pixel resolution will vary with the viewing angle away from the optical centre of the screen, because of the oblique view of the pixels themselves and the lens distortion present.įor now, the following calculation is for the apparent pixel resolution as seen by the viewer along the lens optical axis only. It is assumed the screen is located at the focal plane of the lens, to produce a virtual image projected at infinity. ![]() People are wondering if there is a simple way to estimate the screen pixel density as seen by the viewer.
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