OPENHOUSE 2015

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Exhibition

Three-dimensional Television

17

Spatial Light Modulators Driven by Spin Transfer
Switching

Technology for the future holographic 3D television

Outline

We have been studying ultra-high-density spatial light modulatorst*1 (SLMs) with very large numbers of pixels, which is considered a crucial technology for holographic 3D televisions. Our latest development is a narrow pixel-pitch SLM driven by spin transfer switching, which uses an active matrix driving methodt*2 and can operate under low driving current.

Features

●Spatial light modulators with narrow pixel pitches

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%.

●Light modulator element with the low driving current

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.

Future plans

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
 Technology.

*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.

Basic principles of holographic 3D images by using spatial light modulators
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