An organic light emitting display assembly comprising: an organic light emitting diode panel comprising a side surface, a front surface, and a rear edge surface opposing the front surface; a body frame disposed about the organic light emitting diode panel, the body frame comprising: a body vertical portion surrounding the side surface of the organic light emitting diode panel; a body horizontal portion perpendicularly connected to the body vertical portion, the body horizontal portion supporting the rear edge surface of the organic light emitting diode panel; a cap frame comprising: a cap vertical portion configured for attachment to the body vertical portion of the body frame; and a cap horizontal portion perpendicularly connected to the cap vertical portion, characterized in that: the body vertical portion includes a first vertical part and a second vertical part that together define an insertion groove; the cap vertical portion is configured for insertion into the insertion groove of the body vertical portion of the body frame; the insertion groove defined by the first vertical part and the second vertical part of the body vertical portion includes a first width at an upper first vertical point within the insertion groove, a second width greater than the first width at a central second vertical point within the insertion groove, and a third width less than the second width and greater than the first width at a lower third vertical point within the insertion groove; and the cap vertical portion has a first thickness corresponding to the first width of the insertion groove at a lower first vertical point of the cap vertical portion, a second thickness corresponding to the second width of the insertion groove at a central second vertical point of the cap vertical portion, and a third thickness corresponding to the third width of the insertion groove at an upper third vertical point of the cap vertical portion. an organic light emitting diode panel comprising a side surface, a front surface, and a rear edge surface opposing the front surface; a body frame disposed about the organic light emitting diode panel, the body frame comprising: a body vertical portion surrounding the side surface of the organic light emitting diode panel; a body horizontal portion perpendicularly connected to the body vertical portion, the body horizontal portion supporting the rear edge surface of the organic light emitting diode panel; a body vertical portion surrounding the side surface of the organic light emitting diode panel; a body horizontal portion perpendicularly connected to the body vertical portion, the body horizontal portion supporting the rear edge surface of the organic light emitting diode panel; a cap frame comprising: a cap vertical portion configured for attachment to the body vertical portion of the body frame; and a cap horizontal portion perpendicularly connected to the cap vertical portion, a cap vertical portion configured for attachment to the body vertical portion of the body frame; and a cap horizontal portion perpendicularly connected to the cap vertical portion, characterized in that: the body vertical portion includes a first vertical part and a second vertical part that together define an insertion groove; the cap vertical portion is configured for insertion into the insertion groove of the body vertical portion of the body frame; the insertion groove defined by the first vertical part and the second vertical part of the body vertical portion includes a first width at an upper first vertical point within the insertion groove, a second width greater than the first width at a central second vertical point within the insertion groove, and a third width less than the second width and greater than the first width at a lower third vertical point within the insertion groove; and the cap vertical portion has a first thickness corresponding to the first width of the insertion groove at a lower first vertical point of the cap vertical portion, a second thickness corresponding to the second width of the insertion groove at a central second vertical point of the cap vertical portion, and a third thickness corresponding to the third width of the insertion groove at an upper third vertical point of the cap vertical portion. the body vertical portion includes a first vertical part and a second vertical part that together define an insertion groove; the cap vertical portion is configured for insertion into the insertion groove of the body vertical portion of the body frame; the insertion groove defined by the first vertical part and the second vertical part of the body vertical portion includes a first width at an upper first vertical point within the insertion groove, a second width greater than the first width at a central second vertical point within the insertion groove, and a third width less than the second width and greater than the first width at a lower third vertical point within the insertion groove; and the cap vertical portion has a first thickness corresponding to the first width of the insertion groove at a lower first vertical point of the cap vertical portion, a second thickness corresponding to the second width of the insertion groove at a central second vertical point of the cap vertical portion, and a third thickness corresponding to the third width of the insertion groove at an upper third vertical point of the cap vertical portion.