LED light bulb and LED filament thereof

An LED light bulb, comprising:

• a bulb shell with a lower part and a upper part opposite to the lower part;
• a bulb base connected with the bulb shell;
• a heat dissipating element connected with the lower part of the bulb shell and the bulb base, wherein the height of the heat dissipating element is L1 and the maximum height from the heat dissipating element to the upper part of the bulb shell is L2, the ratio of L1 to L2 is from 1/30 to 1/3;
• a stem disposed in the bulb shell;
• and coated with a thin film of graphene;
• and
• a single flexible LED filament disposed in the bulb shell, the LED filament comprising:
• a plurality of LED chips electrically connected to each other, the aspect ratio of the LED chips is 2:1 to 10:1;
• at least two conductive electrodes respectively disposed corresponding to the plurality of LED chips, the conductive electrodes being electrically connected with the plurality of LED chips;
• a light conversion coating comprising a top layer and a base layer, the top layer of the light conversion coating is disposed on at least two sides of each of the plurality of LED chips and the conductive electrodes;
• a plurality of supporting arms, nonconductively connected with and supporting the flexible LED filament, each of the supporting arms comprises a first end and a second end, the first end of each is nonconductively connected with the stand while the second end is nonconductively connected with the flexible LED filament, the second end of each of supporting arms has a clamping portion, the flexible LED filament is bent into a wavy shape, and the clamping portions clamp a wave crest and a wave trough of the wavy shape;
• two conductive supports, disposed in the bulb shell and electrically connected with the conductive electrodes;
• and
• a driving circuit, electrically connected with the two conductive supports and the bulb base.