Array Substrate TFT Doping Gradient for Stable High-Mobility Displays

The patent applies local quality by creating a doping concentration gradient within the doped portion of the active layer. Specifically, the doping concentration is higher near the drain electrode and lower near the source electrode, forming a progressive doping structure. This local variation in doping concentration optimizes carrier mobility in different regions while managing self-heating effects, thereby maintaining high display performance without sacrificing transistor stability.

The patent changes the doping concentration parameter along the length of the active layer. By progressively varying the doping concentration from the source to the drain region, the patent optimizes the electrical characteristics of the transistor. This parameter change enables high carrier mobility for improved display performance while the gradual transition reduces abrupt junction effects that contribute to self-heating, thus maintaining operational stability.

The patent segments the doped portion into multiple regions with different doping concentrations. Instead of using a uniform high doping concentration throughout, the patent divides the doped region and applies progressive doping with varying concentrations. This segmentation allows the structure to achieve low overall resistance (reducing voltage drop) while avoiding excessive localized doping that would cause severe self-heating, thus balancing energy loss and temperature control.

The patent introduces a dynamic gradient in doping concentration rather than a static uniform doping. The doping concentration varies continuously or in steps from the source to the drain region, creating a dynamic electrical profile. This dynamic structure allows the transistor to maintain low resistance for reduced voltage drop while the gradual concentration change mitigates abrupt carrier injection and reduces self-heating effects, improving stability.