LED filament and LED light bulb

An LED light bulb, comprising:

• a lamp housing;
• a bulb base, connected to the lamp housing;
• a stem connected to the bulb base and located in the lamp housing;
• and
• an LED filament, disposed in the lamp housing,
• wherein points of the LED filament in an xyz coordinates are defined as x, y, and z, an x-y plane of the xyz coordinates is perpendicular to the height direction of the LED light bulb, an z-axis of xyz coordinates is parallel with the stem, wherein the projection of the LED filament on the x-y plane, y-z plane and x-z plane respectively has a length L1, L2 and L3, wherein the length L1, the length L2, and the length L3 are substantially in a ratio of 1:(0.5 to 1):(0.6 to 0.9);
• wherein the LED filament comprises:
• a plurality of LED sections, each of the plurality of LED sections includes at least two LED chips that are electrically connected to each other;
• at least one conductive section, connected with two adjacent of the plurality of the LED sections;
• at least two conductive electrodes, respectively disposed on two ends of the LED filament and electrically connected to the LED sections;
• and
• a light conversion layer;
• wherein the LED filament has a plurality of bending points having the smallest curvature radii in the LED filament among other portions of the LED filament,
• and the plurality of bending points comprise a plurality of first bending points and at least one second bending point,
• wherein the plurality of first bending points are formed by the plurality of conductive sections, and at least one second bending point is formed by the at least one conductive section,
• wherein the plurality of first bending points are coated with the light conversion layer;
• wherein the length L1 is a total length of the projection of the LED filament on the XY plane from one of the at least two conductive electrodes to the other one of the at least two conductive electrodes, the length L2 is a total length of the projection of the LED filament on the YZ plane from one of the at least two conductive electrodes to the other one of the at least two conductive electrodes, and the length L3 is a total length of the projection of the LED filament on the XZ plane from one of the at least one conductive section to one of the at least two conductive electrodes.