Research ArticleAPPLIED SCIENCES AND ENGINEERING

Full-color active-matrix organic light-emitting diode display on human skin based on a large-area MoS2 backplane

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Science Advances  08 Jul 2020:
Vol. 6, no. 28, eabb5898
DOI: 10.1126/sciadv.abb5898
  • Fig. 1 The full-color AMOLED display with large-area MoS2-based backplane.

    (A) Schematic illustration of the high-performance MoS2-based backplane on a 4-inch carrier glass substrate, where an Al2O3 capping layer was applied for n-doping effects on the MoS2 film (top left), an active-matrix full-color display was applied to the ultrathin polymer substrate (top right), and the large-area full-color display was tested on a human hand (bottom right). (B) Scheme of the active-matrix full-color pixel array integrated with MoS2 transistors, where each pixel was connected via a gate, data, and cathode interconnector for line-addressing control. (C) Digital photograph of the active-matrix display on the 4-inch carrier glass substrate, where the inset demonstrates the full-color display when switched on. (D) Digital photograph of the large-area full-color display on the ultrathin polymer substrate, demonstrating the flexible mechanical properties due to the low bending stiffness of the ultrathin material. Photo credit: Minwoo Choi, Yonsei University.

  • Fig. 2 Device properties of the MoS2 transistor and RGB OLEDs.

    (A) Transfer curve of the MoS2 transistor on the 4-inch carrier glass substrate, where the average mobility of 18 cm2 V−1 s−1 was sufficient for operating the RGB OLEDs. (B) I-V characteristics of the MoS2 transistor as the gate bias was increased from +4 to 7 V, where the inset shows the MoS2 transistor. (C) Statistical analysis of the MoS2 transistor mobility across 324 samples. (D to F) I-V characteristics (left y axis) and luminance (right y axis) of the RGB OLED as a function of applied bias, where the insets visualize the emission of each OLED color. (G) EL spectra of the RGB OLED pixels. Photo credit: Sa-Rang Bae, Korea University.

  • Fig. 3 The properties of a single pixel integrated with the MoS2 transistor and RGB OLEDs.

    (A) Schematic illustration of the RGB unit pixels integrated with the MoS2 transistor in a series connection for active-matrix configuration. (B) Pixel-switching properties controlled using a gate bias of −10 and 10 V at fixed data biases of 4 V (red) and 10 V (blue). (C) Digital photograph of the luminance change in the RGB OLEDs in a gate bias range of 4 to 9 V, where the brightness of each OLED was stable and controlled by the gate signal of the MoS2 transistor. (D to F) The pixel current (left y axis) and luminance (right y axis) as a function of gate signal. Photo credit: Sa-Rang Bae, Korea University.

  • Fig. 4 Wearable full-color AMOLED display based on MoS2 backplane circuitry.

    Digital photographs of the full-color active-matrix display during (A) the “all on” state; (B) the dynamic operation of the active-matrix display, where gate and data signals were individually controlled using the external circuit; and (C) the application of the ultrathin display on a human hand, where the display was deformed by two mechanical modes based on hand motion, namely, compressive mode (center) and tensile mode (right). (D) Plots of the unit pixel current as a function of data voltage at VG values of 4 V (off state), 6 V, and 9 V in the compressive (blue), flat (red), and tensile (green) mode. At every applied gate bias (VG), negligible change in pixel current is observed under various modes of deformation, which enables stable operation of AMOLED on human hand. (E) Normalized on-state current variation of the ultrathin display on human hand during mechanical deformation. Photo credit: Minwoo Choi, Yonsei University.

Supplementary Materials

  • Supplementary Materials

    Full-color active-matrix organic light-emitting diode display on human skin based on a large-area MoS2 backplane

    Minwoo Choi, Sa-Rang Bae, Luhing Hu, Anh Tuan Hoang, Soo Young Kim, Jong-Hyun Ahn

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