Pixel circuit

A pixel circuit, comprising:

• a light-emitting diode having an anode and a cathode receiving a system low voltage;
• a first driving transistor having a first terminal, a control terminal receiving an amplitude control signal, and a second terminal;
• a second driving transistor having a first terminal coupled to the second terminal of the first driving transistor, a control terminal receiving a width control signal, and a second terminal coupled to the anode of the light-emitting diode, wherein a channel polarity of the second driving transistor is different from that of the first driving transistor;
• a pulse amplitude modulation circuit coupled to the first terminal, the control terminal, and the second terminal of the first driving transistor and receiving a first system high voltage, an emission signal, and an amplitude data voltage, so as to provide the first system high voltage to the first terminal of the first driving transistor based on the emission signal and provide the amplitude control signal based on the emission signal and the amplitude data voltage;
• and
• a pulse width modulation circuit coupled to the control terminal of the second driving transistor and receiving a second system high voltage, the emission signal, a swing signal, and a width data voltage, so as to provide the width control signal based on the second system high voltage, the emission signal, the swing signal, and the width data voltage, wherein
• when the width data voltage indicates that the pixel circuit displays a low grayscale brightness, the swing signal linearly moves from a swing high voltage toward a swing low voltage with a first slope during a first time period, and during a second time period immediately following the first time period, the swing signal transitions to a swing overdrive voltage lower than the swing low voltage, wherein the swing signal is fixed at the swing overdrive voltage throughout the second time period, and immediately returns to the swing high voltage upon expiration of the second time period, and
• when the width data voltage indicates that the pixel circuit does not display the low grayscale brightness, the swing signal linearly moves from the swing high voltage toward the swing low voltage during the first time period and the second time period.