Sharp Begins to Roll Out IGZO TFT-based LCD Panel

Apr 15, 2012
Shinya Saeki, Nikkei Electronics
The 32-inch 3,840 x 2,160-pixel IGZO TFT-based LCD panel (right) and a 32-inch 1,920 x 1,080-pixel amorphous Si TFT-based LCD panel (left)
The 32-inch 3,840 x 2,160-pixel IGZO TFT-based LCD panel (right) and a 32-inch 1,920 x 1,080-pixel amorphous Si TFT-based LCD panel (left)
[Click to enlarge image]
The 10-inch 2,560 x 1,600-pixel IGZO TFT-based LCD panel (right) and a 10-inch 1,280 x 800-pixel amorphous Si TFT-based LCD panel (left)
The 10-inch 2,560 x 1,600-pixel IGZO TFT-based LCD panel (right) and a 10-inch 1,280 x 800-pixel amorphous Si TFT-based LCD panel (left)
[Click to enlarge image]
The 7-inch 1,280 x 800-pixel IGZO TFT-based LCD panel (right) and a 7-inch 1,280 x 800-pixel amorphous Si TFT-based LCD panel (left). The new panel has a narrower bezel.
The 7-inch 1,280 x 800-pixel IGZO TFT-based LCD panel (right) and a 7-inch 1,280 x 800-pixel amorphous Si TFT-based LCD panel (left). The new panel has a narrower bezel.
[Click to enlarge image]
The power consumptions of the 11-inch 1,366 x 800-pixel IGZO TFT-based LCD panel announced in April 2011 (right) and a 11-inch 1,366 x 800-pixel amorphous Si TFT-based LCD panel (left). The upper two meters indicate the power consumptions of the panels while the lower meters indicate the power consumptions of their backlights.
The power consumptions of the 11-inch 1,366 x 800-pixel IGZO TFT-based LCD panel announced in April 2011 (right) and a 11-inch 1,366 x 800-pixel amorphous Si TFT-based LCD panel (left). The upper two meters indicate the power consumptions of the panels while the lower meters indicate the power consumptions of their backlights.
[Click to enlarge image]

Sharp Corp announced April 13, 2012, that it has started volume production of a high-resolution LCD panel using IGZO (In-Ga-Zn-O) TFTs, which are oxide semiconductors, as driver elements at Kameyama Plant No. 2.

Sharp started the volume production in March 2012 and plans to start full-scale volume production in April 2012. So, what the company claims is the world's first volume production of IGZO TFT-based high-resolution LCD panel will begin three months behind schedule (within 2011).

The high-resolution LCD panel is targeted at tablet computers. When asked about the purchaser and specifications of the panel, Sharp said, "We do not comment on customer information." And the company did not answer any questions about Apple Inc's iPad, for which the LCD panel is rumored to be supplied.

Sharp is currently planning to provide IGZO TFT-based LCD panels not only for tablet computers but for "Ultrabook" computers, high-resolution medical monitors, etc.

This time, Sharp showed 32-inch 3,840 x 2,160-pixel (4k, resolution: 140ppi), 10-inch 2,560 x 1,600-pixel (resolution: 300ppi) and 7-inch 1,280 x 800-pixel (resolution: 217ppi) panels in addition to the 11-inch 1,366 x 800-pixel panel that was announced in April 2011. The 32-, 10- and 7-inch panels are targeted at high-resolution monitors, Ultrabook computers and tablet computers, respectively.

Sharp has already started to ship samples of the three panels, and they can be mass-produced upon request, the company said.

3 features emphasized

The IGZO TFT was developed by Sharp in cooperation with Semiconductor Energy Laboratory Co Ltd. Its carrier mobility and on-state current are about 20-50 and 20 times, respectively, higher than those of amorphous silicon (Si) TFTs, which are used for large-size LCD panels, the company said. Also, its off-leak current is 1pA or lower, it said.

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