Mask and LED module

An LED module comprising a substrate, a plurality of LED emitting units, a mask and a polarizer, the plurality of LED emitting units being provided at a side of the substrate, the mask being integrally in a grid structure and comprising a plurality of grid units mounted around the plurality of LED emitting units, respectively, each of the plurality of grid units being enclosed by a retaining wall, one end of the retaining wall away from the substrate extending outwards along a direction close to a center of the grid unit to form a support edge, an outer side of the support edge being provided with a support plane;

• the polarizer comprising first circular polarizers, second circular polarizers and a third polarizer, the third polarizer being a reflective polarizer with a reflective surface thereof facing towards the plurality of LED emitting units, a portion of a side of the reflective polarizer that is away from the plurality of LED emitting units corresponding to each of the plurality of LED emitting units being individually provided with the first circular polarizer or the second circular polarizer, wherein the third polarizer is configured to perform polarization reflection on light emitted by the LED emitting units;
• the first circular polarizers and the second circular polarizers being circular polarizers and being opposite in polarization directions, wherein the light emitted by the LED emitting units is transmitted through the third polarizer, is then incident on the first circular polarizers or the second circular polarizers, and is converted into left circularly polarized light or right circularly polarized light by the first circular polarizers or the second circular polarizers.