Novel CMOS-Backplane Technologies for Fine Pixel Pitch and High Image Quality of LCOS Microdisplay

Amari, Koichi; Honda, Tomoaki; Sakairi, Takashi; Maeda, Keiichi; Okazaki, Tsuyoshi; Hikichi, Kunihiko; Narui, Shunsuke; Yoshinaga, Tomoro

doi:10.36463/idw.2021.0173

Cited by 3 publications

(2 citation statements)

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“…Conversely, LC-SLMs have large amplitude-and phasemodulation capabilities, and efforts have been made to reduce the pixel pitches in recent years. 10,13 Hwang et al 10 realized a phase-modulation SLM on glass with a pixel pitch of 1 Â 9 μm and pixel number of 16 Â 3.2 k. Meanwhile, Amari et al 13 realized an amplitudemodulation liquid crystal-on-silicon (LCOS) with a pixel pitch of 2.6 Â 2.6 μm and pixel number of 7680 Â 4320. As per Equation (1), however, at a reference light wavelength of 532 nm, these pixel pitches of 9 and 2.6 μm still result in narrow viewing-zone angles of 3.4 and 11.7 , respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Higashida et al 12 have demonstrated the first‐order diffraction efficiency of approximately 1.5 × 10 −6 for an MO light modulator array that was made of Gd 24 Fe 76 thin film, which is significantly lower compared with the other SLMs. Conversely, LC‐SLMs have large amplitude‐ and phase‐modulation capabilities, and efforts have been made to reduce the pixel pitches in recent years 10,13 . Hwang et al 10 realized a phase‐modulation SLM on glass with a pixel pitch of 1 × 9 μm and pixel number of 16 × 3.2 k. Meanwhile, Amari et al 13 realized an amplitude‐modulation liquid crystal‐on‐silicon (LCOS) with a pixel pitch of 2.6 × 2.6 μm and pixel number of 7680 × 4320.…”

Section: Introductionmentioning

confidence: 99%

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Ferroelectric liquid crystal array driven by a two‐layer electrode with a 1 × 1 μm pixel pitch for light modulation in electro‐holography

Aso,

Yamamoto,

Aoshima

et al. 2023

J Soc Info Display

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We clarified that a ferroelectric liquid crystal (FLC) has high resolution display capability as small as 1 × 1 μm pixel pitch using an FLC pixel array with a two‐layer electrode, which has a 1 × 1‐μm‐checkered apertured electrode and a plane electrode separated by an insulation layer. By applying +2 V to the apertured electrode and −10 V to the plane electrode in the two‐layer electrode and 0 V to the transparent common electrode, a checkered pattern was clearly observed, which indicates the successful individual pixel driving with a pixel pitch of 1 × 1 μm. When fabricating 1 × 2‐μm‐pitch rectangular FLC pixels, we elucidated that the liquid crystal alignment direction should be along the shorter side of the pixels to avoid asymmetric transmittance distribution in each pixel. Moreover, we successfully reconstructed a 3D holographic image using 10 × 10 k FLC pixel array with a pitch of 1 × 1 μm driven by the two‐layer electrode with hologram‐patterned apertures. We showed that FLC is a strong candidate material for realizing spatial light modulator with extremely small pixel pitches, which is essential for holographic displays with wide‐viewing‐zone angles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ferroelectric liquid crystal array driven by a two‐layer electrode with a 1 × 1 μm pixel pitch for light modulation in electro‐holography

Aso,

Yamamoto,

Aoshima

et al. 2023

J Soc Info Display

View full text Add to dashboard Cite

show abstract

Magneto-optical spatial light modulator driven by current-induced domain wall motion for holographic display applications

Aoshima¹,

Funabashi²,

Higashida³

et al. 2023

Opt. Express

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We have developed a magneto-optical spatial light modulator (MO-SLM) with a 10 k × 5 k pixel layout and with a pixel pitch horizontally of 1 µm and vertically of 4 µm. An MO-SLM device pixel has a magnetic nanowire made of Gd-Fe magneto-optical material whose magnetization was reversed by current-induced magnetic domain wall motion. We successfully demonstrated the reconstruction of holographic images, showing large viewing zone angles as wide as 30 degrees and visualizing different depths of the objects. These characteristics are unique to holographic images, providing physiological depth cues which may play a vital role in three-dimensional (3D) perception.

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Thermomagnetic recording of highly Bi-substituted iron garnet film using scanning laser for spatial light modulation

Sakaguchi,

Honma,

Zhang

et al. 2024

Jpn. J. Appl. Phys.

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Spatial light modulations (SLM) utilizing magneto-optical (MO) effect of magnetic materials are expected to offer fast switching and small pixel size as small as wavelength of the light. However, the small MO effect is a major issue. In this paper, we report a thermomagnetic recording of highly bismuth-substituted garnet film, known for large Faraday effects. Y0.5Bi2.5Fe4GaO12 (Bi,Ga:YIG) film with a Faraday rotation of -4.66 degrees was used as an MO medium. A laser scanning thermomagnetic recording system using Galvanometer mirror was developed and the size and quality of recorded magnetic domains were investigated. The smallest recorded magnetic domain diameter was 0.62 μm with a small standard deviation of 0.09 μm. Line patterns with a width of 1 µm can be recorded in this film. We found that Bi,Ga:YIG films have potential as a material for SLMs with fast switching, submicron pixel size and large MO effect.

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Novel CMOS-Backplane Technologies for Fine Pixel Pitch and High Image Quality of LCOS Microdisplay

Cited by 3 publications

References 0 publications

Ferroelectric liquid crystal array driven by a two‐layer electrode with a 1 × 1 μm pixel pitch for light modulation in electro‐holography

Ferroelectric liquid crystal array driven by a two‐layer electrode with a 1 × 1 μm pixel pitch for light modulation in electro‐holography

Magneto-optical spatial light modulator driven by current-induced domain wall motion for holographic display applications

Thermomagnetic recording of highly Bi-substituted iron garnet film using scanning laser for spatial light modulation

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