Patent ID: 11892765
Assignee: APPOTRONICS CORPORATION LIMITED
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. The projection screen according to claim 1, wherein an angle between a normal direction of the projection screen and an incident projection light is defined as A, an angle between a projection light reflected by the projection screen and the normal direction of the projection screen is defined as B, the first angle is defined as θ1, and the third angle is defined as θ3, then a boundary between the first area and the second area satisfy:, θ
        1
      
      =
      
        
          B
          -
          A
        
        2
      
    
    ,
    and
  

  
    
      
        θ
        3
      
      =
      
        
          A
          -
          B
        
        2
      
    
    ,
  

and when A=B, θ1=θ3.