In　this　paper,　we　propose　a　high-resistance　(Hi-R)　liquid　crystal　(LC)　micro-lens　arrays　(MLAs)　with　a　low　operating　voltage　and　a　controllable　focal　length　for　integral　imaging　(II)　3D　display.　The　focal　lengths　of　the　Hi-R　LC　MLAs　can　be　effectively　controlled　by　applying　different　operating　voltages　and　driving　frequencies.　The　experimental　results　indicate　that　the　focal　lengths　can　be　adjusted　from　4.27　mm　to　2.88　mm　when　the　operating　voltage　applied　to　the　Hi-R　LC　MLAs　increases　from　1.8　Vrms　to　2.8　Vrms　at　the　driving　frequency　of　130　kHz.　Compared　with　the　II　3D　display　by　using　ITO　circular-hole　electrodes-based　or　Al　circular-hole　electrodes-based　LC　MLAs　without　Hi-R　layer,　the　II　3D　display　based　on　the　Hi-R　LC　MLAs　with　Al　circular-hole　electrodes　can　reveal　clear　3D　scenes　at　the　corresponding　center　depth　plane　(CDP)　when　a　low　operating　voltage　is　applied　to　the　Hi-R　LC　MLAs.　Furthermore,　the　generated　elemental　images　with　different　depths　can　be　reconstructed　at　different　CDPs　by　electrically　controllable　focal　lengths　of　the　Hi-R　LC　MLAs,　and　these　3D　scenes　can　be　realized　the　switchable　display　in　the　same　II　3D　display　system,　which　can　effectively　present　the　optical　performance　of　the　II　3D　display.