Technology for the future holographic 3D television
To be able to observe holographic 3D images from various angles, we need ultra-high-density spatial light modulators with very narrow pixel pitches. By increasing the density of the spatial light modulator driven by spin transfer switching, we have succeeded in narrowing the pixel-pitch by 60%.
We have developed a device that uses innovative light modulator elements as pixels. This technology is based on the tunnel magneto-resistance effect*3 which draws less electrical current than conventional methods. It operates by spin transfer magnetization reversal, whereby the magnetizing direction of light modulator elements is controlled by the direction of current flowing through each pixel.
To achieve a narrow pixel-pitch, ultra-high-resolution spatial light modulator, we aim to develop a nano-scale-fabrication process and further improve our light modulator elements.
● This research is supported in part by the National Institute of Information and Communication Technology (NICT), under the project “R&D of ultra-
realistic communication technology through innovative 3D image technology,” and is being conducted in collaboration with Nagaoka University of
*1 Spatial light modulator: a device consisting of a 2D arrangement of tiny optical elements (equivalent to pixels) that is able to control the state of light
(amplitude, phase, etc).
*2 Active matrix driving method: a method to individually operate selected pixels by allocating switching elements as transistors for each pixel.
*3 Tunnel magneto-resistance effect: a phenomenon whereby the electrical resistance of an insulating layer, placed between two magnetic layers, alters
depending on the relative angle of the two magnetic layers.