An LED bulb with a screw base; a cover forming an accommodation space with the screw base; an LED filament located in the accommodation space including a substrate comprising a top surface, a side surface, and an extension direction; a plurality of LED chips disposed on the first top surface; a first electrode arranged on the top surface, electrically connected to the plurality of LED chips; and a first clamp including first and second projecting prongs. The first electrode is clamped by the first and second projecting prongs within the accommodation space. The LED bulb has an imaginary rotational axis not parallel to the extension direction.
1. An LED bulb, comprising:
a screw base;
a cover, forming an accommodation space with the screw base;
an LED filament located in the accommodation space, comprising:
a substrate comprising a first top surface, a side surface, and an extension direction;
a plurality of LED chips disposed on the first top surface along the extension direction; and
a first electrode and a second electrode separately arranged on the first top surface, and electrically connected to the plurality of LED chips; and
a first clamp and a second clamp connected to the first electrode and the second electrode, respectively, and holding the LED filament to suspend between the first clamp and the second clamp without other support directly connected to the LED filament within the accommodation space,
wherein, the LED bulb has an imaginary rotational axis not parallel to the extension direction.
2. The LED bulb of claim 1 , wherein the LED filament further comprises a phosphor layer disposed on the first top surface, and covering the plurality of LED chips without covering the first electrode and the side surface.
3. The LED bulb of claim 1 , wherein the first electrode is electrically connected to one of the plurality of LED chips by a bonding wire, the bonding wire has a second top surface higher than the first electrode in an elevation based on the first top surface.
4. The LED bulb of claim 1 , further comprising an adhesive layer formed between the substrate and the plurality of LED chips.
5. The LED bulb of claim 1 , wherein the first clamp electrically connects the first electrode to the screw base.
6. The LED bulb of claim 1 , wherein the first electrode is located at a side of the first top surface.
7. The LED bulb of claim 1 , wherein the first electrode and the second electrode are located at two opposite sides of the first top surface.
8. The LED bulb of claim 1 , wherein the substrate further comprises a bottom surface opposite to the first top surface, and the bottom surface is a continuous planar surface.
9. The LED bulb of claim 1 , wherein the first electrode has a rectangular shape.
10. The LED bulb of claim 1 , wherein the first electrode is not directly connected to the first top surface.