Monday, May 20, 2013
Japan Display Develops 5-inch Full-HD TFT LCD Module with
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Japan Display has developed a 5.0-inch Full-HD (1,080 x
1,920 pixels) TFT LCD module with JDI's proprietary
integrated touch functionality "Pixel Eyes".
JDI started mass production of a 5.0-inch Full-HD TFT LCD
module in October 2012, and introduced an R&D prototype of
the 5.0-inch Full-HD "Pixel Eyes" version in the same month
as part of JDI's "Innovation Vehicle" lineup shown at the
FPD International 2012 exhibition in Yokohama, Japan. JDI
has now succeeded in establishing "Pixel Eyes" and its touch
function controller on a production-ready basis for a new
5.0-inch Full-HD TFT LCD module.
There are various requirements for LCD module
performance in the market today, such as higher resolution,
wider viewing angle, higher picture quality, lower power
consumption, and thinner module thickness. In addition,
higher productivity of touch-based devices. According to
JDI, "Pixel Eyes" contributes to high productivity because
the touch functionality is formed with fewer process steps
compared to conventional touch choices.
"Pixel Eyes" detects touch through changes in capacitance
between electrodes on the TFT substrate and on the color
JDI has a "Pixel Eyes" product lineup in mass production,
available in resolution formats of 720HD (720 x 1280 pixels)
and qHD (540 x 960 pixels).
JDI's touch controller drive system realizes a high
signal-to-noise (S/N) ratio under various operating
environments to ensure touch usability. The JDI system
configuration synchronizes the LCD driver and the touch
controller, and detects the touch event during a period in
time outside of the display RGB write period. This realizes
a high S/N ratio under various operating environments to
ensure touch usability, and also holds promise for other
user interfaces, such as input by a passive stylus.
The integration of the touch functionality into the LCD
eliminates the need for an external touch panel. The
configuration reduces module thickness by approximately 30%
versus conventional modules with external touch panels, and
by approximately 10% versus recently popular modules which
adopt a touch sensor function on the cover lens.
"Pixel Eyes" does not require an external touch panel, and
therefore reduces optical reflections at the component
surface boundary interfaces and improves visibility. For the
same reason, transmittance is increased by approximately 10%
compared to conventional modules with external touch panels,
contributing to an increase in module brightness.
"Pixel Eyes" requires only one additional process step to
add the touch functionality, though other touch methods
typically require multiple process steps. JDI is planning to
start mass production of "Pixel Eyes" products at the new G6
production line in Mobara, Japan, that goes into operation
in June 2013.
- Screen size: 5.0-inch (12.6cm) (diagonal)
- Number of pixels: 1,080 (x RGB) x 1,920 (Full-HD)
- Resolution density: 445ppi
- Display mode: Transmissive IPS
- Viewing angle: Vertical/Horizontal 160 degrees (with
contrast ratio > 100:1)
- Dimensions: 63.6mm (width) x 115.8mm (height)
- Surface luminance: 450cd/m2 (Typ.)
- NTSC ratio: 71%
Contrast ratio: 1000:1 (Typ.)