76.3: 32‐inch LCD Panel Using Amorphous Indium‐Gallium‐Zinc‐Oxide TFTs

Abstract

32-inch TFT-LCD Panel using the amorphous indium-galliumzinc-oxide (a-IGZO) thin-film transistors (TFTs) is demonstrated in this study. The size of 32-inch TFT-LCD driven by a-IGZO TFTs was the top two largest sizes in our limited information. Less report was larger than the size of 32-inch a-IGZO TFT-LCDs. To realize a-IGZO TFTs driving the large size TFT-LCD panel, bottom gate structure is proposed. High performance a-IGZO TFTs is achieved successfully to ligh-on the 32-inch LCD panel. Uniform electrical characteristic is obtained on the coplanar type TFTs. The field effect mobility is 5.16 cm 2 /Vs, threshold voltage is 0.5 V, sub-threshold swing is 0.38 V/decade, and on/off current ratio is 1.8 x 10 8 . After 1000 sec DC gate bias stress at -30 V, the threshold voltage shifts is less than 1.1 V.

Apparent high mobility ~30 cm²/Vs of amorphous In–Ga–Zn–O thin-film transistor and its origin

“…Amorphous oxide semiconductor (AOS) possesses many advantages such as large electron mobilities for amorphous semiconductor >10 cm 2 /Vs, high transparency in the visible region, low-temperature process compatibility down to room temperature (RT), and good uniformity over large area; 1), 2) therefore, it is expected for a channel material of a thin-film transistor (TFT) in next-generation flat-panel displays such as electronic papers, 3) organic light-emitting-diode displays, 4) liquid-crystal displays (LCD), 5) flexible displays, 6) and transparent displays. Among the AOS materials, amorphous InGaZnO (a-IGZO) is the most widely-investigated AOS and most close to a wide commercialization; indeed, a-IGZO TFT is commercialized in a retina display of new iPad in March, 2012.…”

58.2: High‐Performance Large‐Size OLED Tv with Ultra Hd Resolution

“…In the past few years, AUO has successfully demonstrated many different prototypes and continued to discover new applications. Using the knowledge gained from fabricating the 32-inch IGZO LCD panel, a 65-inch large-scale a-IGZO AMLCD panel was published at 2010 and 2011 [1]. In 2012, a 32-inch IGZO AMOLED television panel was demonstrated at the SID international symposium [2].…”

51.1: Amorphous Indium‐Gallium‐Zinc‐Tin‐Oxide TFTs with High Mobility and Reliability

“…Active matrix displays addressed by a-IGZO TFTs have been demonstrated for LCDs [2] and OLEDs [3]. However, although a-IGZO has a filed effect mobility ( FE ) of ~10 cm 2 /Vs [4], about 10 times larger than that of a-Si, it is insufficient to drive ultra-high definition and high frame rate displays.…”