Patent ID: 11947137
Assignee: SHENZHEN SKYWORTH-RGB ELECTRONIC CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A design method for a composite membrane, comprising:
arranging a test board on a light-emitting side of a plurality of LED light sources, and turning on the LED light sources;
establishing a plurality of rectangular test areas corresponding to each of the LED light sources on the test board, and detecting a brightness uniformity on each of the rectangular test areas;
comparing the brightness uniformity of each of the rectangular test areas with a preset value, defining a rectangular test area having the brightness uniformity less than the preset value as a lamp bead shadow area; and defining both a rectangular test area having the brightness uniformity greater than the preset value, and a plurality of areas on the test board other than the rectangular test areas as a non-lamp bead shadow area; and
arranging a base plate on a light-emitting side of the plurality of LED light sources, and arranging a plurality of dispersive prism areas and a plurality of diffusion plates on a light-emitting surface of the base plate, respectively, while making the dispersive prism areas correspond to the lamp bead shadow areas, and making the diffusion plates correspond to the non-lamp bead shadow areas;
fixing a first quadrangular surface of a plurality of dispersive prisms to the light-emitting surface of the base plate, and arranging the plurality of dispersive prisms into a dispersive prism matrix corresponding to an area and a position according to the area and position of the lamp bead shadow areas; and
arranging a first coating layer with an equal area on a light-emitting surface of the base plate at a position corresponding to the non-lamp bead shadow, and arranging a plurality of diffusion particles on the first coating layer, the plurality of diffusion particles being arranged in a matrix:
fixing a plurality of first diffusion particles on both the second quadrangular surface and the third quadrangular surface of the dispersive prisms;
arranging a second coating layer on a light incidence surface of the base plate; and
arranging a plurality of second diffusion particles on a surface of the second coating layer against the base plate.