Waveguide plate and calculation method for output energy distribution of coupling-in area of waveguide plate

The invention discloses a waveguide sheet and a calculation method for output energy distribution of a coupling-in area of the waveguide sheet, and the calculation method comprises the steps: dividing the coupling-in area into N subareas in a first direction by taking a step length as a unit; wherein N is greater than or equal to 1, and N is a positive integer; the first direction is opposite to the propagation direction of the incident light; the step length is the distance between two reflection points when incident light is transmitted in the waveguide substrate; obtaining the output energy of the N partitions and the ratio of the energy weights of the partitions, and calculating the output energy distribution of the N partitions according to the output energy and the energy weights of the N partitions; and superposing the output energy distribution of the N subareas to obtain the output energy distribution of the coupling-in area. The calculation method of the waveguide plate provided by the embodiment of