P-16: Integration of the 4.5ʺ Active Matrix Organic Light-emitting Display with Organic Transistors

Abstract

We developed an active matrix organic light‐emitting display(OLED) on a glass using two organic thin‐film transistors(OTFTs) and a capacitor in a pixel. The OTFTs has bottom contact structure with a unique gate insulator and pentacene for the active layer. The width and length of the switching OTFT is 500 μm and 10 μm respectively and the driving OTFT has 900 μm channel width with the same channel length. The characteristics of the OTFTs were examined by test cells around display area and generated images on the panel. The mobility was 0.3 cm2V−1S−1 and the current on/off ratio was 106. The uniformity and stability were confirmed through still and moving images on the panel. The organic light‐emitting layers were fabricated by shadow mask process and color fluorescence materials were used for the emitting layers. The resolution of the panel is 64×RGB×64 in 4.5 inch diagonal and the aperture ratio was 25%.

Organic Transistors in Optical Displays and Microelectronic Applications

“…Zhou et al reported a 48 × 48 pixels OTFT‐OLED in which a pentacene layer was patterned by photolithography on a plastic substrate [poly(ehtylene terephthalate), PET] 35. Choi et al demonstrated 12 × 12 pixels OTFT‐OLED on a glass,36 Han et al demonstrated a 124 × 94 pixels OTFT‐OLED on a plastic substrate (polyethersulfone, PES),37 and Lee et al demonstrated a 192 × 64 pixel OTFT‐OLED on a glass 38. Recently Suzuki et al reported a full‐color 213 × RGB × 120 pixels OTFT‐OLED panel on a plastic substrate (polyethylene naphthalate, PEN) 39…”

Reliable and Uniform Thin‐Film Transistor Arrays Based on Inkjet‐Printed Polymer Semiconductors for Full Color Reflective Displays

“…Because of the above areal uniformity issue, most of the backplane OTFT arrays for display applications available in the literature are reported to be fabricated by either vacuum deposition of small molecules or spin‐coating followed by lithographic patterning of the spin‐cast films. The latter methods are more favorable than inkjet printing in terms of areal uniformity of OTFT performance …”