Quantum-dot　color　conversion　film　(QDCCF)　with　a　partitioned　black　matrix　(BM)　realizes　effective　color　generation　with　low　crosstalk　for　micro-light-emitting　diode　(mu　LED)　displays.　However,　this　traditional　BM　seriously　deteriorates　light　conversion　efficiency　(LCE)　of　QD　converted　mu　LED　displays　due　to　its　absorption　energy　loss.　In　this　paper,　a　novel　internal　and　external　reflective　black　matrix　(IERBM)　is　proposed　to　improve　the　LCE　and　blue　light　utilization　(BLU)　by　light　recycling　and　reuse.　Based　on　the　IERBM　structural　optimization,　the　LCE　can　be　respectively　improved　by　3.39x　and　2.74x　for　red　and　green　QDCC　sub-pixels,　and　the　BLU　can　be　effectively　increased　by　1.11x.　Accurate　white　balance　and　high　color　uniformity　are　achieved　by　this　mu　LED　display.　Meanwhile,　both　the　crosstalk　of　1.72%　and　the　color　gamut　of　89.8%　Rec.　2020　are　comparable　with　traditional　absorptive　BM.　It　is　also　found　that　the　proposed　IERBM　has　the　potential　to　weaken　mu　LED＇s　sidewall　effect.　This　work　may　open　up　a　new　technological　route　for　improving　the　optical　performance　in　advanced　self-emissive　displays.