Mini-LED　backlight　and　quantum-dot　color　conversion　(QDCC)　technology　are　the　research　hotspots　of　emerging　display　technology.　When　they　are　combined　together,　the　luminance　uniformity　issue　may　occur　because　of　traditional　QDCC　film　(QDCCF)　with　uniform　thickness.　This　paper　designs　and　optimizes　QDCCFs　with　non-uniform　thickness　of　cone　and　circular　truncated　cone,　respectively.　The　illuminance　uniformity　is　analyzed　by　simulation.　Results　show　that　the　illuminance　uniformity　of　the　optimized　cone　and　circular　truncated　cone　with　a　single　structure　can　reach　73.97%　and　74.72%,　respectively.　The　single　structure　with　uniform　thickness　is　only　35.84%.　After　that,　the　single　structure　with　non-uniform　thickness　is　arrayed　with　a　basic　substrate　added　at　the　bottom,　which　is　matched　with　the　mini-LED　backlight.　By　optimizing　the　array　configuration　and　the　basic　substrate,　the　illuminance　uniformity　of　the　backlight　reaches　73.55%　and　79.25%,　respectively.　This　QDCCF　with　non-uniform　thickness　distribution　can　effectively　improve　the　illuminance　uniformity　when　mini-LED　is　combined　with　QDCCF.　This　work　proposes　a　new　strategy　for　uniform　color　conversion　of　mini-LED　display　backlights.