Active Matrix Driving Organic Light-Emitting Diode Panel Using Organic Thin-Film Transistors

Abstract

We developed an active matrix driving organic light-emitting diode (OLED) panel on a glass substrate using two organic thin-film transistors (OTFTs) per pixel, a switching OTFT and a driving OTFT. The OTFTs are bottom contact structures with the high-dielectric constant gate insulator tantalum oxide (Ta2O5, relative dielectric constant of 23) produced by anodization in ammonium adipate solution and with pentacene as the active layer. The W/L (where W and L are the OTFTs channel width and length, respectively) was 400 µm/10 µm for the switching OTFTs and 680 µm/10 µm for the driving OTFTs. The characteristics of the OTFTs were improved by treating the Ta2O5 surface with hexamethyldisilazane (HMDS), so that the field-effect mobility was 2.0×10-1 cm2 V-1 s-1 and the current on/off ratio was 105. A green phosphorescent dopant, tris(2-phenylpyridine)iridium [Ir(ppy)3], was used for the OLED layer. The panel had 8×8 pixels and the aperture ratio was 27%. We confirmed a 16-gray-scale representation and a luminance of 400 cd/m2.

Optical biosensors based on integrated polymer light source and polymer photodiode

“…Although many researchers published results for discrete organic light‐emitting diode (OLEDs), organic field‐effect transistor (OFETs), and organic photodiode (OPDs) components, only recently the integration into monolithic systems has been explored. Examples include the combination of OFETs with OLEDs,2–4 OFETs and OPDs,5, 6 and OLEDs together with OPDs 7–9. The combination of OLEDs and OPDs is very promising for novel application areas such as chemical sensing,10–12 bio‐sensing,13, 14 or optical integrated systems 7…”

Fabrication of 5.8‐in. OTFT‐driven flexible color AMOLED display using dual protection scheme for organic semiconductor patterning

“…An active-matrix (AM) display consisting of organic thin-film transistors (OTFTs) and organic light-emitting diodes (OLEDs) has many advantages, including a low-cost fabrication process and mechanical flexibility. 1,2 These organic electronic devices are compatible with thin plastic film in terms of their material characteristics and fabrication process. It is expected that they can be simply fabricated on plastic film by using a solution or printing process.…”

Correlation Between On/Off Ratio and Electron Traps in Hole-Only Carbon-Nanotube-Enabled Vertical Field Effect Transistors

“…Efforts to commercialize active matrix organic light emitting diode (AMOLED) displays are increasing and motivated by the promise of mechanical flexibility and increased viewing angle and response time [1][2][3]. Organic light emitting transistors have been demonstrated [4][5][6] and promise to reduce the driving voltage and simplify the circuitry in all-organic AMOLED displays.…”