The invention relates to a light shield used for a display. The light shield comprises a first shading sheet, a second shading sheet, a third shading sheet and a movable gate, wherein the first shading sheet is arranged at the first lateral side of the display, the second shading sheet is arranged at the second lateral side, opposite to the first lateral side, of the display, the third shading sheet is arranged at the third lateral side, between the first and second lateral sides, of the display, the third shading sheet includes an opening, and the movable gate covers the opening and includes a front side and a back side. The back side is provided with a first clasp piece and a second clasp piece, and the first clasp piece and the second clasp piece extend to the first side edge and the second side edge of the opening respectively, and are clamped with the first side edge and the second side edge of the opening respectively. The first and second clasp pieces are clamped with the two side edges, opposite to each other, of the opening to reduce the assembling tolerance and reduce the sliding freedom, positioning is easy, and the assembling quality is improved.