High　dynamic　range　(HDR)　display　can　present　images　that　are　visually　indistinguishable　from　the　real　setting　they　portray.　The　system　of　high　dynamic　range　display　based　on　the　dual-structure　of　the　projector　or　LED　array　has　many　shortcomings,　such　as　huge　volume　and　low　local　contrast.　So　this　paper　presents　a　backlight　source　of　liquid　crystal　display　(LCD)　based　on　field　emission　display　(FED).　The　field　emission　backlight　structure　is　described,　the　point-by-point　control　mechanism　of　front　and　back　panels　is　proposed,　and　the　high　dynamic　image　in　the　systems　of　two　panels　is　divided.　We　discuss　the　backlight　displays　of　the　FED　with　the　problems　of　halo,　according　to　the　problems　of　motion　artifact　about　LCD　and　FED　devices　the　problems　of　motion　artifacts　of　HDR　display　system　based　on　the　dual-structure　of　LCD-FED　are　analyzed　and　the　motion　artifact　and　halo　are　measured　by　experiment.　The　display　device　of　FED　backlight　is　fabricated.　The　method　in　this　paper　has　the　advantages　of　raising　local　contrast　and　dodging　the　halo　and　motion　artifacts　of　high　dynamic　range　LCD.　The　experimental　results　demonstrate　that　the　field　emission　backlight　structure　can　increase　the　LCD　local　contrast　to　216:1,　and　it　has　higher　practical　value　for　displayer.