Sharp was first out the door with its parallax barrier technology, which is apparently being used in the Nintendo 3DS, to skirt around wearing glasses when viewing 3D. Toshiba's now got similar a 21-inch display which also doesn't require glasses.
It may be 21-inches in size, but the resolution isn't quite full-HD, at 1280 x 800 WXGA. As with Sharp's parallax barrier displays, glasses won't be required to view 3D content, with Toshiba's press release about their "autostereoscopic high-definition display" describing it using an "integral imaging system (a "light field" display) to reproduce a real object as a 3D image that can be viewed without glasses over a wide range of viewing angles."
Going on, the release says of the technology:
"The integral imaging system offers a significant reduction in eye fatigue during long periods of viewing, and features a multi-parallax design that enables motion parallax, which cannot be achieved by systems using glasses. The multi-parallax approach results in images that change depending on the viewer's position. In addition, the viewing angle is wide, and the resulting stereoscopic image is natural and smooth. In some previous integral imaging implementations, there have been issues raised relating to the loss of effective image resolution. In previous implementations, if the number of pixels in the display is kept constant and not increased, then the multi-parallax approach will reduce the effective resolution of the 3D display in an inverse proportion to the number of parallax positions. We have addressed this problem by applying LTPS (low-temperature poly-silicon) technology to develop an ultra-high-definition LCD module for this newly-introduced high-definition and large-screen 3D display.
This 21-inch auto-stereoscopic high-definition display adopts a lens sheet to control reduction in surface luminance intensity, resulting in brightness comparable to standard 2D displays. The power consumption of the display is relatively low. The new 21-inch display is considered to be environmentally friendly with low power usage. Furthermore, the display can be used in a vertical or horizontal position. When used in the vertical position, the user faces the upright screen from the front as a person would usually use a 2D monitor. However, when used in the horizontal position, the user overlooks the stereoscopic image formed by the display lying face-up, as one would overlook a relief model. Compared with the front view, the 3D images seen face-up from the bird's eye view are more stereoscopic and realistic."
Hitachi has already announced it's licensing Sharp's technology for their own glasses-less panels, and of course there's that fabled 3DS from Nintendo which either uses something very similar to parallax barrier 3D or actually licenses Sharp's own work. [Toshiba Mobile Display via Akihabara News]