A point light source is an ideal point light source.Point light source is an abstract physical concept, in order to simplify the study of physical problems.Just like the smooth plane, particle and no air resistance, the point light source does not exist in reality. It refers to the light source that shines uniformly from a point to the surrounding space.Point light source is a new type of decorative light, is a linear light source and floodlight lighting supplement. pixel spacing: the distance from the center of one pixel point to the center of another pixel point, that is, what we now call "P several", such as P3, P6...;Point distance is the distance between two pixels to reflect the pixel density, point distance and pixel density are the physical characteristics of flash screen;Information capacity is the number of units of information carrying capacity flashed at a time per unit area pixel density.
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