LED light bulb with curved filament

An LED light bulb, comprising:

• a bulb shell;
• a bulb base connected with the bulb shell;
• two conductive supports disposed in the bulb shell;
• a stem extending from the bulb base to inside of the bulb shell;
• two supporting arms disposed in the bulb shell;
• and
• an LED filament comprising:
• a plurality of LED chips arranged in an array along an elongated direction of the LED filament;
• and
• two conductive electrodes respectively disposed at two ends of the LED filament and connected to the LED chips, wherein the two conductive electrodes are respectively connected to the two conductive supports;
• wherein the stem has a stand extending to a center of the bulb shell, a first end of each of the two supporting arms is connected with the stand while a second end of each of the two supporting arms is connected with the LED filament, wherein the LED filament is curled and at least a half of the LED filament is around the center of the bulb shell;
• wherein from a side view of the LED light bulb, a center portion of the LED filament is substantially on an elongated direction of the stand;
• a direction of a first highest curved portion of the LED filament and a direction of a second highest curved portion of the LED filament are substantially opposite to a direction of a lower curved portion of the LED filament.