15.2: Development of Driver‐Integrated Panel Using Amorphous In‐Ga‐Zn‐Oxide TFT

Abstract

We designed, prototyped, and evaluated LCD integrated with a gate driver and a source driver using amorphous In-Ga-Zn-Oxide TFTs having bottom-gate bottom-contact structure, thereby obtaining TFTs with superior characteristics.Then, we prototyped the world's first 4-inch QVGA LCD and integrated the gate driver and source driver on the display panel.

Light irradiation and applied voltage history sensors using amorphous In-Ga-Zn-O thin-film transistors exposed to ozone annealing and fabricated under high oxygen pressure

“…1) Therefore, -IGZO TFTs have been extensively developed for flat-panel displays (FPDs) such as active-matrix liquid-crystal displays (AM-LCDs), 2,3) active-matrix organic light-emitting diode displays (AM-OLEDs), [4][5][6] and electronic papers (EPs). 7) Moreover, thin-film devices have been lately employed for various kinds of sensor applications.…”

Low-power and small-area scan driver using depletion-mode a-IGZO TFTs for ultra-high-resolution displays

“…The power consumption for driving the QXGA panel is about three times higher than that of the XGA panel because the operation frequency increases twice and load capacitance increases from 150 to 250 pF. The proposed scan driver employed only four external signals and 11 TFTs, and the power consumption is considerably lower than that of previous scan drivers [5][6][7].…”

“…Many researches have been done to make a scan driver integrated on display panels using oxide TFTs [4][5][6][7]. However, previously reported scan drivers adopted many external signals, such as seven [5,6] or eight signals [4].…”

“…However, previously reported scan drivers adopted many external signals, such as seven [5,6] or eight signals [4]. Increasing the number of clock signals creates more power consumption due to increasing the number of transitions of clock signals and the necessity of large area for signal lines.…”

“…Increasing the number of clock signals creates more power consumption due to increasing the number of transitions of clock signals and the necessity of large area for signal lines. Furthermore, output waveforms of the previously reported scan drivers [4][5][6] are overlapped, which induces deterioration in image quality because the pixel displays images of the previous row line during the overlapped line time with the previous scan signal. A scan driver with one clock signal and three reference voltages is reported in [7], but this circuit is too complex, using 22 TFTs per stage and has the effective turn-on time of switching TFTs in pixels by approximately half of a row line time because the driving voltage is not high enough during a half of a row line time.…”