Patent attributes
An LED tube lamp includes a lamp tube, having a first pin and a second pin for receiving an external driving signal; a first rectifying circuit for rectifying the external driving signal; a filtering circuit for producing a filtered signal; an LED lighting module configured for emitting light; and a ballast-compatible circuit, coupled to the first rectifying circuit, and containing a metallic electrode, a bimetallic strip, and a heating filament in an inert gas. A spacing is configured between the bimetallic strip and the metallic electrode, and the bimetallic strip includes two metallic strips with different temperature coefficients. When the external driving signal is initially input at the first pin and second pin, the ballast-compatible circuit will be in an open-circuit state, until entering a conduction state, which allows a current to flow through the LED lighting module thus allowing the LED tube lamp to emit light.
