Low-Power integrated driver circuits with multiple outputs based on Thin-Film transistors for mobile micro Light-Emitting diode displays

This article proposes low-power integrated driver circuits based on low-temperature polycrystalline silicon (LTPS) thin-film transistors (TFTs) for small and medium-sized mobile micro light-emitting diode (μLED) displays. Two integrated driver circuits can output four signals to operate the μLED pixel circuit: the integrated scan driver outputs two scan signals, and the integrated emission driver outputs an emission signal and a sweep signal. Moreover, driver circuits are designed to enable the always-on-display (AOD) mode, which consumes less power than the normal mode. Compared to the normal mode, the proposed circuits do not output unnecessary signals in the AOD mode, reducing power consumption by 38.0 and 29.6% in the integrated scan and emission circuits. In addition, compared to the gate driver circuits with a single output signal. The proposed integrated scan and emission driver circuits reduce power consumption by 16.6 (25.2) and 42.5 (51.3)% in the normal (AOD) mode, respectively, by sharing the control unit for multiple outputs. We also fabricated the proposed driver circuits and verified that the proposed circuits successfully output multiple signals for mobile μLED pixel circuits.