Back frame, method for manufacturing back frame, and backlight system

A back frame of a flat panel display device, wherein:

• the back frame comprises at least two primary assembling pieces, the at least two primary assembling pieces being connected through joining;
• the at least two primary assembling pieces have lengths that are adjustable in order to form a main frame structure of the back frame that is of various sizes, in which lengths of two parallel sides of the main frame structure are both subjected to adjustment;
• the length-adjustable primary assembling pieces comprises a first sub-assembling piece and a second sub-assembling piece that are joined at ends;
• the back frame comprises a first fastener and a second fastener, the first fastener and the second fastener being set at different locations to join the first sub-assembling piece and the second sub-assembling piece;
• the first sub-assembling piece has an end forming a first through hole and a second through hole spaced in a lengthwise direction of the first sub-assembling piece and the second sub-assembling piece has an end forming a slit extending in a lengthwise direction of the second sub-assembling piece, the slit having a length greater than a spacing distance between the first through hole and the second through hole;
• and
• the first fastener extends through the first through hole and the slit to join the first sub-assembling piece and the second sub-assembling piece and the second fastener extends through the second through hole and the slit to join the first sub-assembling piece and the second sub-assembling piece.

A back frame of a flat panel display device, wherein:

• the back frame comprises at least two primary assembling pieces, the at least two primary assembling pieces being connected through joining;
• the at least two primary assembling pieces have lengths that are adjustable in order to form a main frame structure of the back frame that is of various sizes, in which lengths of two parallel sides of the main frame structure are both subjected to adjustment;
• the length-adjustable primary assembling pieces comprises a first sub-assembling piece and a second sub-assembling piece that are joined at ends;
• the back frame comprises a first fastener and a second fastener, the first fastener and the second fastener being set at different locations to join the first sub-assembling piece and the second sub-assembling piece;
• the first sub-assembling piece has an end forming a through hole and a first slit spaced in a lengthwise direction of the first sub-assembling piece, the first slit extending in the lengthwise direction of the first sub-assembling piece, and the second sub-assembling piece has an end forming a second slit extending in a lengthwise direction of the second sub-assembling piece, the second slit having a length greater than a spacing distance between the through hole and the first slit;
• and
• the first fastener extends through the through hole and the second slit to join the first sub-assembling piece and the second sub-assembling piece and the second fastener extends through the first slit and the second slit to join the first sub-assembling piece and the second sub-assembling piece.