Autostereoscopic　3D-LED　displays　using　parallax　barriers　have　several　advantages.　However,　conventional　designs　do　not　consider　the　black　stripes　of　regular　LED　panels.　These　cause　immeasurable　crosstalk　owing　to　excess　light　from　adjacent　sub-pixels　separated　by　the　panels.　To　reduce　the　crosstalk　in　large-scale　displays,　we　design　a　barrier　in　which　the　black-stripe　occupation　ratio　is　defined　to　quantify　the　crosstalk　level　in　the　LED　system.　A　prototype　is　assembled　and　analyzed　based　on　a　three-in-one　pixel　LED-chip　panel　for　a　dual　viewpoint　display.　The　improved　parallax　barrier　meets　the　design　requirements　and　achieves　a　low　crosstalk　level.　Simulation　and　experiment　results　verify　the　effectiveness　of　the　crosstalk-reduced　design.