[Wireless Japan] NTT Docomo Shows Lenticular Lens-based 3D LCD Display

Jul 15, 2010
Shinya Saeki, Nikkei Electronics
NTT Docomo's 3D LCD display that can be viewed with the naked eye
NTT Docomo's 3D LCD display that can be viewed with the naked eye
[Click to enlarge image]
A demonstration of moving a 3D image by using a touch panel
A demonstration of moving a 3D image by using a touch panel
[Click to enlarge image]

NTT Docomo Inc developed a 3D LCD display that can be viewed with the naked eye and exhibited it at Expo Comm Wireless Japan 2010, which runs from July 14 to 16, 2010, in Tokyo.

With the display, 3D images can be viewed from eight viewpoints, each of which has an angular range of 15°.

"We would like to equip mobile phones and smart phones with the display within a few years," NTT Docomo said.

The new display shows 3D images by using a lenticular lens placed on the front side. The size and pixel count of the display are 2.57 inches and 1,028 x 768 (XGA), respectively. Because the number of viewpoints is eight, the pixel count for 3D images is about 320 x 240 (QVGA).

The company declined to comment on the brightness and contrast ratio of the display. The display cannot show 2D images.

"If we use an LCD panel that can change optical refraction index like a lenticular lens, it is possible to switch between 2D and 3D modes," NTT Docomo said. "However, because the resolution of the LCD panel for showing images is high, it is technically difficult."

3D LCD displays that can be viewed with the naked eye use either a lenticular lens or a parallax barrier, which provides a slit to partially block off light. The 3D LCD display that Sharp Corp announced in April 2010 is equipped with a parallax barrier (See related article). This time, NTT Docomo employed a lenticular lens to ensure the brightness of 3D images.

"A parallax barrier lowers brightness because of a slit," the company said. "The brightness of our new 3D display was not compromised much."

NTT Docomo said that it developed the display in collaboration with a Japanese panel manufacturer. Seiko Epson Corp announced an LCD panel whose specifications are almost the same as those of the new 3D LCD display in August 2008 (See related article 2).

動画 A demonstration of moving a 3D image by using a touch panel
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