Pixelated　quantum　dot　color　conversion　layer　(PQDCCL)　is　the　most　promising　approach　to　realize　a　full-color　micro-LED　display.　However,　the　QD　excitation　by　ambient　light　has　non-negligible　impact　on　the　ambient　contrast　ratio　(ACR)　and　the　display　readability,　and　the　ACR　issue　of　color-converted　micro-LED　display　has　not　been　fully　explored　before.　In　this　paper,　the　theoretical　models　of　unpixelated　monochromatic　and　pixelated　polychromatic　QDCCLs　(UP/PQDCCL)　are　established　to　quantificationally　analyze　the　ACR　of　a　micro-LED　display,　which　is　further　demonstrated　by　both　ray-tracing　simulation　and　experimental　test.　The　simulation　and　theoretical　results　are　highly　consistent,　and　the　average　deviation　is　only　6.73%.　In　terms　of　experimental　verification,　the　ACR　indices　are　between　19.90　and　36.20　for　the　prepared　UP/PQDCCLs　that　are　obtained　by　photolithography　technique　and　measured　under　the　indoor　ambient　light　of　500　lx　and　the　luminance　of　the　micro-LED　screen　of　1000　nits.　The　experimental,　simulation,　and　theoretical　results　are　fully　compared　and　analyzed　to　show　the　application　prospect　of　the　proposed　model　in　QD-based　micro-LED　displays.　More　importantly,　this　model　could　provide　theoretical　support　and　proof　for　the　ACR　estimation　of　self-luminous　color-converted　displays.　©　2023　The　Author(s)