Current　mini-LED　backlights　improve　high-dynamic-range　liquid　crystal　displays　(LCDs)　by　using　tens　of　thousands　of　direct-lit　sources　for　local　dimming.　However,　relative　thick　profile　and　high　power　consumption　are　the　inherent　limitations　while　compared　with　edge-lit　backlights.　By　synthesizing　edge-　and　direct-lit　advantages,　we　propose　a　novel　hybrid　mini-LED　backlight　equipped　with　a　specially　designed　integrated　light　guiding　plate　(LGP)　for　large-area　displays.　This　LGP　is　seamlessly　spliced　by　multiple　physically　segmented　sub-LGPs　with　a　scattering　dot　array　on　the　bottom　and　U-shaped　grooves　at　the　corners.　Each　sub-LGP　is　a　single　local　dimming　zone　that　can　be　independently　controlled.　Scattering　dot　distribution　can　be　numerically　calculated　even　from　multiple　edge-lit　sources.　High　optical　performance　and　satisfactory　local　dimming　effect　are　verified　and　analyzed　via　both　simulation　and　experiment.　The　experimental　spatial　illuminance　uniformity　and　the　light　extraction　efficiency　reach　81%　and　83%　while　the　crosstalk　can　be　well　suppressed　below　0.2%　between　adjacent　local　dimming　zones.　The　significant　advantages　of　our　design　towards　state-of-the-art　mini-LED　backlights　include　the　zero　optical　distance　for　an　ultra-thin　profile,　low　mini-LED　amount　for　local　dimming,　high　optical　efficiency,　and　infinite　extension　of　zone　number,　which　is　expected　to　have　a　broad　application　prospect　in　the　near　future.　©　2021　Optical　Society　of　America　under　the　terms　of　the　OSA　Open　Access　Publishing　Agreement.