Screen unit for rear projection picture display system, method for producing the same and component to be used for assembling the screen unit

A method for forming a rear projection screen unit panels in a large-size picture display apparatus composed by combining a plurality of rear projection screen panels arranged in a lattice square with at least one ordinate beam and at least one abscissa beam disposed between the adjacent screen panels, wherein each of said screen panels intersects with each of said beams which themselves intersect with each other:

• comprising;
• providing a row of a plurality of tenons on the side edges of each of said screen panels that face said beams;
• providing a plurality of mortises on both surfaces of said beams that face said side edges of each of said screen panels, disposed in a row that coincides with said row of said tenons;
• depositing at least one reflection preventing colored layers on said side edges including said tenons of said screen panels that face said beams;
• depositing an adhesive layer on each of the tops of said tenons on said screen panels;
• and
• assembling said screen panels and said beams in the lattice square by inserting said tenons into said mortises for forming a multiple mortise-and-tenon joint between said screen panels and ordinate and abscissa beams.

Beams for assembling a rear projection screen unit in a large-size picture display apparatus, composed by arranging a plurality of rear projection screen panels which has, on their joining edges, a row of a plurality of tenons with adhesive layers on their tops, in a lattice square, comprising:

• at least one ordinate beam having a row of mortises, each of which is adapted to accommodate each of said tenons;
• and
• at least one abscissa beam having a row of mortises, each of which is adapted to accommodate each of said tenons.
• wherein;
• both of said beams have at least one indent at which one of said beams intersects with the other by fitting them in the indent of the counterpart.