A flat panel display device comprising a display panel and a driver circuit carrier bonded to the display panel, wherein the driver circuit carrier comprises: a substrate; and a plurality of first pins arranged on at least one surface of the substrate along a first reference line, an imaginary extending line of at least one of the plurality of first pins intersecting with a second reference line perpendicular to the first reference line, wherein the display panel comprises a non-display area in which there is a plurality of second pins arranged along a third reference line, an imaginary extending line of at least one of the second pins intersects with a fourth reference line perpendicular to the third reference line, and an arrangement of the second pins in the display panel with respect to the third and fourth reference lines corresponds to an arrangement of the first pins in the driver circuit carrier with respect to the first and second reference lines, wherein the first pins in the driver circuit carrier are fully or partially bonded to the second pins in the display panel so that the second reference line coincides with the fourth reference line, wherein an overall shape of a layout of the first pins appears like a trapezoid having a shorter base close to the display panel and a longer base away from the display panel, and each of the first pins comprises a first end close to the shorter base of the trapezoid and a second end opposite to the first end, characterised in that, from the first end to the second end, a cross-sectional width of each of the first pins diminishes gradually, then keeps constant, and then diminishes gradually again; or from the first end to the second end, the cross-sectional width of each of the first pins keeps constant, then diminishes gradually, and then keeps constant again, wherein shapes of the second pins correspond to shapes of the first pins, while the second pins and the first pins are disposed in a reversed way, such that the wider ends of the first pins are bonded to the narrower ends of the second pins and vice versa. a substrate; and a plurality of first pins arranged on at least one surface of the substrate along a first reference line, an imaginary extending line of at least one of the plurality of first pins intersecting with a second reference line perpendicular to the first reference line, wherein the display panel comprises a non-display area in which there is a plurality of second pins arranged along a third reference line, an imaginary extending line of at least one of the second pins intersects with a fourth reference line perpendicular to the third reference line, and an arrangement of the second pins in the display panel with respect to the third and fourth reference lines corresponds to an arrangement of the first pins in the driver circuit carrier with respect to the first and second reference lines, wherein the first pins in the driver circuit carrier are fully or partially bonded to the second pins in the display panel so that the second reference line coincides with the fourth reference line, wherein an overall shape of a layout of the first pins appears like a trapezoid having a shorter base close to the display panel and a longer base away from the display panel, and each of the first pins comprises a first end close to the shorter base of the trapezoid and a second end opposite to the first end, characterised in that, from the first end to the second end, a cross-sectional width of each of the first pins diminishes gradually, then keeps constant, and then diminishes gradually again; or from the first end to the second end, the cross-sectional width of each of the first pins keeps constant, then diminishes gradually, and then keeps constant again, wherein shapes of the second pins correspond to shapes of the first pins, while the second pins and the first pins are disposed in a reversed way, such that the wider ends of the first pins are bonded to the narrower ends of the second pins and vice versa.