US Patent 11551606 LED driving circuit, display panel, and pixel driving device

Embodiments relate to display panel and pixel driving device techniques. A hybrid scheme is provided in that a PWM (pulse width modulation) scheme, in which a ramp voltage is supplied as a gate voltage of a transistor and an LED is turned off at a time point when the gate voltage becomes the same as a threshold voltage, and a PAM (pulse amplitude modulation) scheme, in which a start voltage of the ramp voltage is determined depending on a gray scale value of a pixel, are combined.