Liquid Crystal Display requires low power consumption,good uniformity of light as a backlight.In order to reduce power consumption and improve the quality of the display image,the future of Liquid Crystal Display backlight needs to realize that time and array can be modulated.Compared with conventional Liquid Crystal Display backlight,zinc oxide field emission backlight has been researched.In this field emission backlight,zinc oxide nanostructure has been taken on as field emission cathode,aplanar gate structure to achieve luminance modulation,a metal grid with magnesium secondary electron emitting layer as a focus electrode to achieve uniform illumination.The results showed that a zinc oxide field emission backlight with a focus electrode having a low turn-on field(1.1V/μm),a relative small voltage modulation range(less than 150V),a high luminous intensity(greater than 1 000cd/m2),and the electron focusing structure design would achieve a uniform and stable illumination,which could improve the image quality of the liquid crystal display.With this zinc oxide electron focused field emission backlight,the light emission from backlight could be modulated by time and array independence,while the uniformity of light emission could also be improved,zinc oxide electron focused field emission backlight would be ideal as the LCD backlight.