Method for designing diffraction suppression optical component, display screen and under-screen camera apparatus

An under-screen camera apparatus, comprising:

• a diffraction suppressing display screen having a display surface for displaying and a rear surface opposite the display surface;
• and
• a camera, which is arranged on a side of the diffraction suppressing display screen where the rear surface is positioned, and is used for imaging an object located on a side of the diffraction display screen where the display surface is positioned, wherein
• the diffraction suppressing display screen comprises:
• a display screen that allows light to pass therethrough and comprises periodically arranged pixel units;
• and
• a first diffraction suppressing optical device disposed at a distance d from the display screen,
• wherein the display screen has a first transmittance function t1(x1,y1), so that a light field complex amplitude distribution U(x2,y2,d)=A(x2,y2,d)exp(iφ20(x2,y2,d)) is obtained when a plane wave U0=A0exp(iφ0) is incident on the display screen and transmitted and then propagates by the distance d, and the first diffraction suppressing optical device has a second transmittance function t2 (x2,y2)=exp(iφ21(x2,y2)), and satisfies φ20 (x2,y2,d)+φ21 (x2,y2)=C, where C is a constant;
• the display screen further comprises light-shielding strips periodically arranged around the pixel units, and the diffraction suppressing display screen further comprises a second diffraction suppressing optical device which is configured to have a third transmittance function t3 (x3,y3)=A3 (x3,y3), so as to change light transmittance at a position near the edge of the light-shielding strips;
• and
• the second diffraction suppressing optical device is formed as a sheet-shaped component comprising a first region arranged periodically in two dimensions and a second region having a strip shape and arranged around the first region, the first region being a light-transmitting region, wherein the second region has a shape generated by randomly dislocating a plurality of unit patterns arranged along an extending direction of the strip shape in a lateral direction perpendicular to the extending direction, and the second region is light-shielding at least in its two lateral edge portions.