An omnidirectional LED light bulb, comprising: - a bulb shell; - a bulb base, connected with the bulb shell; - a stem in the bulb shell, the stem connected with the bulb base, wherein the stem has a stand extending to the center of the bulb shell; - a single LED filament (100, 200), disposed in the bulb shell; - a plurality of supporting arms connecting to the stand and the single LED filament, a first end of each of the supporting arms connecting to the stand and a second end of the supporting arm connecting with the single LED filament; and - two conductive supports (14a,14b), each of the conductive support passing through the stem and electrically connected to one end of the single LED filament wherein the single LED filament comprises: - a plurality of LED chips (102, 104, 202, 204); - at least two conductive electrodes (110, 112, 210, 212), disposed corresponding to the plurality of LED chips, the plurality of LED chips and the conductive electrodes being electrically connected therebetween; and - a light conversion coating (120, 220), coating on and contact at least the topside and the bottom side of the LED chips and the conductive electrodes, and exposing a portion of two of the conductive electrodes, the portion of two of the conductive electrodes exposed from the light conversion coating is electrically connected to the conductive support, wherein the light conversion coating comprises phosphors, inorganic oxidized nanoparticles and an adhesive, the size of the inorganic oxidized nanoparticles is substantially smaller than the size of the phosphors and the weight ratio of the phosphors to the adhesive is 1:1 to 50:1, characterized in that the single LED filament (100, 200) is bent to form a contour from the top view of the light bulb and wave shape from a side view of the light bulb, the supporting arms connect, respectively, with the plurality of wave crests and the plurality of wave troughs. - a bulb shell; - a bulb base, connected with the bulb shell; - a stem in the bulb shell, the stem connected with the bulb base, wherein the stem has a stand extending to the center of the bulb shell; - a single LED filament (100, 200), disposed in the bulb shell; - a plurality of supporting arms connecting to the stand and the single LED filament, a first end of each of the supporting arms connecting to the stand and a second end of the supporting arm connecting with the single LED filament; and - two conductive supports (14a,14b), each of the conductive support passing through the stem and electrically connected to one end of the single LED filament - a plurality of LED chips (102, 104, 202, 204); - at least two conductive electrodes (110, 112, 210, 212), disposed corresponding to the plurality of LED chips, the plurality of LED chips and the conductive electrodes being electrically connected therebetween; and - a light conversion coating (120, 220), coating on and contact at least the topside and the bottom side of the LED chips and the conductive electrodes, and exposing a portion of two of the conductive electrodes, the portion of two of the conductive electrodes exposed from the light conversion coating is electrically connected to the conductive support,