Projection system and projection method
A projection system and projection light technology, applied in the projection system and the projection field, can solve the problem of low contrast of the projection system, and achieve the effects of reducing stray light, reducing the influence of contrast, and improving contrast
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[0058] First of all, it should be noted that the contrast of a projection system usually refers to the ratio of the central illuminance value of the full white field to the central illuminance value of the full black field in a certain fixed projection screen. Usually, in a completely black field, you can directly turn off the power to falsely increase the contrast. Therefore, there is also a definition of ANSI contrast. The test method is to present 4*4 all black and all white alternately area (such as figure 1 Shown), and under this screen test to obtain ANSI contrast C R , specifically, the ANSI contrast C R conform to the following formula.
[0059]
[0060] where E bright Represents the central illuminance of the white area, E black Represents the central illuminance of the black area, E la Represents the central illuminance of the ambient light when the white area is not projected, E ba Represents the central illuminance of the ambient light when the black area ...
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