High dynamic range (HDR) display can present images that are visually in distinguishable from the real setting they portray.The system of high dynamic ra nge display ba sed 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 m echanism 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 base d 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 fabricatedThe method in this p aper has the advantages of raising local contras t and dodging the halo and motion artifacts of high dynamic range LCD.The experimental results demonstr at e that the field emission backlight structure can increase the LCD local contrast to 2¹⁶∶1,and it has higher practical value for displayer.