We　propose　here　a　novel　multi-layered　waveguide　liquid　crystal　(LC)　smart　window　with　full　color　rendering　based　on　a　polymer-network　liquid　crystal　system.　The　inserted　position　of　three-primary-color　LED　light　bars　is　specially　designed,　which　is　parallel　to　the　LC　alignment　to　obtain　a　higher　difference　between　transparent　and　scattering　states.　The　optimal　matching　of　polymer-network　LC　system　is　experimentally　achieved　by　comparing　several　groups　of　LC　and　reactive　mesogen　materials.　The　prepared　smart　window　is　measured　and　analyzed　in　detail　including　optical/chromatic　test,　morphology　characterization,　and　actual　application　effect.　The　proposed　architecture　opens　up　new　prospects　of　flexible　color　switchable　ability　and　synchronized　full-color　display　for　smart　windows　without　limitations　of　slow　LC　response　time　and　complicated　field　sequential　driving　scheme.　(C)　2019　Optical　Society　of　America　under　the　terms　of　the　OSA　Open　Access　Publishing　Agreement