Light　field　imaging　(LFI)　based　on　Liquid　crystal　microlens　array　(LC　MLAs)　are　emerging　as　a　significant　area　for　3D　imaging　technology　in　the　field　of　upcoming　Internet　of　things　and　artificial　intelligence　era.　However,　in　scenes　of　LFI　through　conventional　MLAs,　such　as　biological　imaging　and　medicine　imaging,　the　quality　of　imaging　reconstruction　will　be　severely　reduced　due　to　the　limited　depth　of　field.　Here,　we　are　proposed　a　low-voltage　driving　LC　MLAs　with　electrically　tunable　depth　of　field　(DOF)　for　the　LFI　system.　An　aluminum-doped　zinc　oxide　(AZO)　film　was　deposited　on　the　top　of　the　hole-patterned　driven-electrode　arrays　and　used　as　a　high　resistance　(Hi-R)　layer,　a　uniform　gradient　electric　field　was　obtained　across　the　sandwiched　LC　cell.　Experimental　results　confirm　that　the　proposed　LC　MLAs　possess　high-quality　interference　rings　and　tunable　focal　length　at　a　lower　working　voltage.　In　addition,　the　focal　lengths　are　tunable　from　3.93　to　2.62　mm　and　the　DOF　are　adjustable　from　15.60　to　1.23　mm.　The　experiments　demonstrated　that　the　LFI　system　based　on　the　proposed　structure　can　clearly　capture　3D　information　of　the　insets　with　enlarged　depths　by　changing　the　working　voltage　and　driving　frequency,　which　indicates　that　the　tunable　DOF　LC　MLAs　have　a　potential　application　prospects　for　the　biological　and　medical　imaging.