A representative display system includes: a pixel array having a plurality of pixels, gate lines, and data lines; a first of the pixels having a first TFT, a second TFT, a storage capacitor, and an LED; the first TFT having a first gate electrode, a first source electrode, and a first drain electrode, the first gate electrode coupled to a first of the gate lines, the first source electrode and the first drain electrode coupled between a first of the data lines and a first terminal of the storage capacitor; the second TFT having a second gate electrode, a second source electrode, and a second drain electrode, the second gate electrode coupled between the first TFT and the storage capacitor; the LED coupled to the second TFT; wherein the storage capacitor is configured to store a data voltage corresponding to a data signal, coupled to the first terminal, from the first of the data lines during an on-time of the first TFT; and wherein the LED is controllable to emit light at a brightness corresponding to duration of a driving current flowing through the LED, the driving current being provided to the LED in response to the data voltage from the storage capacitor and a PWM signal, coupled to a second terminal of the storage capacitor terminal and configured as a sawtooth waveform, being provided to the second gate electrode.