First, single LED is analysed and disposed approximately to build the mathmatical model, light energy of one point on screen is calculated by algebraic addition, then the distribution of light energy on the whole area of screen is deduced.

• 首先对单个发光二极管进行分析，对其做近似处理，建立数学模型，用代数叠加的方法来推导光幕面内某一点的光能量。