The　Fabry-Pérot　(F-P)　cavity　structure　has　drawn　wide　interest　because　of　its　ability　to　tune　a　variety　of　bright　colors.　However,　the　too　strong　interference　effect　generated　results　in　a　much　high　color　saturation　with　a　little　adjustable　range,　not　suitable　for　some　applications　with　delicate　display.　In　this　paper,　cavity　designs　with　semiconductors　(Si　and　GST)　and　metal　(Al)　as　the　base　were　discussed　and　it　demonstrated　that　the　F-P　interference　effect　occurs　not　only　on　highly　reflective　metals　but　also　on　semiconductors.　The　study　provides　a　novel　idea　for　the　color　display　of　F-P　structure.　©　2023　SPIE.