NHK, Panasonic Introduce 145-inch Super-high Vision PDP
NHK (Japan Broadcasting Corp) and Panasonic Corp developed a 145-inch PDP (plasma display panel) supporting the super-high vision (SHV) with a pixel count of 7,680 x 4,320.
This is the first announcement of a direct-view-type display supporting the SHV since the announcement of an 85-inch LCD display developed by NHK and Sharp Corp in May 2011 (See related article).
"This is the first self-luminous direct-view-type SHV display device in the world," said Keiichi Kubota, director-general, Science and Technology Research Laboratories at NHK.
The pixel pitch, resolution and drive frequency of the 145-inch PDP is 0.411mm, about 60ppi and 60Hz, respectively.
"It is possible to experience video with realistic sensations from a distance of 1.6m, which is the optimal viewing distance," said Yoshio Ito, director of Display Devices Business Group and senior vice president at AVC Network Co, Panasonic.
Though some of the PDP's specifications such as brightness, contrast ratio, color gamut and thickness were not disclosed, Panasonic said that they are equivalent to those of existing PDPs.
PDP prototyped at Amagasaki Fifth Plant
NHK and Panasonic started the development of the PDP in April 2007. This time, they made a prototype at Panasonic's Amagasaki Fifth Plant, which is currently not being used.
Though Panasonic did not reveal the details of the technologies used to realize the SHV, it mentioned two points. First, it cited a driving method. The company enabled to scan multiple pixels arranged in the vertical direction on the screen at the same time by improving speed so that more than 4,000 scanning lines can be stably driven without causing flickering.
Second, Panasonic mentioned a production technology. It is necessary to realize a resolution higher than that of its 42-inch 1,920 x 1,080-pixel PDP TV (about 52ppi) on the 145-inch screen. But it is difficult to improve the resolution and increase the screen size of a PDP because the volume of the cell that stores fluorescent materials greatly influences its luminous efficiency, the company said.
"(For the new PDP,) we did not use any special volume production method but controlled the process to enhance uniformity," Panasonic said.
NHK and Panasonic are now planning to reduce the size of the PDP for use at home.
"We aim to realize 70 to 80 inches," Kubota said.
They did not mention any specific commercialization schedule.
"There are many challenges to overcome such as size reduction of pixels," Ito said.