A mobile electronic device (501, 901) comprising: a display panel (420, 520, 920) comprising a plurality of layers including a front panel (421, 521, 921) comprising a plurality of pixels, the plurality of layers further including a metal sheet layer including a first opening therein; a first printed circuit board (423, 523) extending from the front panel (421, 521, 921), wherein a portion of the first printed circuit board (423, 523) is disposed below the display panel (420, 520, 920), includes a display IC, and is electrically connected to the front panel (421, 521, 921); a housing (642, 742, 942) disposed below the front panel (421, 521, 921) and having a second opening; a biometric sensor disposed below the front panel (921, 521, 921) via the housing (642, 742, 942) so that an upper surface of the biometric sensor is exposed to light through the second opening of the housing (642, 742, 942), and faces a rear surface of the front panel (421, 521, 921) through the first opening of the metal sheet layer and the second opening of the housing (642, 742, 942); and a second printed circuit board (641, 741) comprising a rigid part and a flexible part, disposed below the biometric sensor and electrically coupled to the biometric sensor, the biometric sensor being attached to an upper surface of the rigid part of the second printed circuit board (641, 741) by an adhesive, wherein a lower surface of the housing (642, 742, 8942) is attached to the upper surface of the rigid part of the second printed circuit board (641, 741) by an adhesive, wherein the housing (642, 742, 942) is configured to position the biometric sensor such that the upper surface of the biometric sensor is spaced apart from the rear surface of the front panel (421, 521, 921) via an unoccupied space formed by the first opening of the metal sheet layer and the second opening of the housing (642, 742, 942), wherein the first printed circuit board (423, 523) includes a third opening in the portion disposed below the display panel (420, 520, 920) such that the first printed circuit board (423, 523) does not overlap an area where the housing (642, 742, 942) and the rigid part of the second printed circuit board (641, 741) are disposed. a display panel (420, 520, 920) comprising a plurality of layers including a front panel (421, 521, 921) comprising a plurality of pixels, the plurality of layers further including a metal sheet layer including a first opening therein; a first printed circuit board (423, 523) extending from the front panel (421, 521, 921), wherein a portion of the first printed circuit board (423, 523) is disposed below the display panel (420, 520, 920), includes a display IC, and is electrically connected to the front panel (421, 521, 921); a housing (642, 742, 942) disposed below the front panel (421, 521, 921) and having a second opening; a biometric sensor disposed below the front panel (921, 521, 921) via the housing (642, 742, 942) so that an upper surface of the biometric sensor is exposed to light through the second opening of the housing (642, 742, 942), and faces a rear surface of the front panel (421, 521, 921) through the first opening of the metal sheet layer and the second opening of the housing (642, 742, 942); and a second printed circuit board (641, 741) comprising a rigid part and a flexible part, disposed below the biometric sensor and electrically coupled to the biometric sensor, the biometric sensor being attached to an upper surface of the rigid part of the second printed circuit board (641, 741) by an adhesive, wherein a lower surface of the housing (642, 742, 8942) is attached to the upper surface of the rigid part of the second printed circuit board (641, 741) by an adhesive, wherein the housing (642, 742, 942) is configured to position the biometric sensor such that the upper surface of the biometric sensor is spaced apart from the rear surface of the front panel (421, 521, 921) via an unoccupied space formed by the first opening of the metal sheet layer and the second opening of the housing (642, 742, 942), wherein the first printed circuit board (423, 523) includes a third opening in the portion disposed below the display panel (420, 520, 920) such that the first printed circuit board (423, 523) does not overlap an area where the housing (642, 742, 942) and the rigid part of the second printed circuit board (641, 741) are disposed.