Fig. 8: Active-matrix QLEDs displays.
From: Direct ambient photopatterning of RGB quantum dots for light-emitting diodes with EQE exceeding 20%
a Schematic and structure of the pixel drive circuit consisting of three TFTs (address TFT-1, drive TFT-2, and reset TFT-3) and a storage capacitor. The layers (PEDOT: PSS, TFB, QDs, ZnO) were spin-coated on the TFT backplane with a grounded co-cathode. TFT-1, controlled by scan voltage (Vscan) and data voltage (Vdata), biases TFT-2 to drive the QLED, while TFT-3 resets the potential for the next operation. PV1and PV2 are passivation layers. a-Si and n+ denote amorphous silicon and n-type doping. b Patterned QLEDs displays fabricated on large-size TFT backplanes with RGB sub-pixels of 380 × 650 μm and a resolution of 19 ppi. Scale bars, 200 μm. c Patterned QLEDs displays fabricated on small-size TFT backplanes. Right: integration of single-color QDs on TFT backplanes with RGB sub-pixel dimensions of 85 × 140 μm and a resolution of 77 ppi. Scale bars, 200 μm. EL images of QLED displays with single- (d), dual- (e), and ternary- (f) color patterns of red, green, and blue QD layers, showing the images of letters, numbers, symbols, and Chinese characters. Scale bars, 1 cm.
