Mr. Saejin Park Profile

Saejin Park

at RAONTECH

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Proceedings Article | 14 March 2023 Presentation + Paper

0.37-inch UHD, 11,800 PPI liquid crystal on silicon micro-display with embedded 4x up-scaler using micro-mirror space-interpolation pixel circuit for metaverse augmented reality glasses

Minsu Jeong, Junghwan Lee, Kwangsoo Lee, Jihoon Kim, Saejin Park, Bo-Eun Kim

Proceedings Volume 12443, 1244303 (2023) https://doi.org/10.1117/12.2645045

KEYWORDS: Liquid crystal on silicon, Augmented reality, Video, Glasses, Spatial resolution, Micromirrors, Power consumption, Liquid crystals, Image resolution, Mirrors

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A 0.37-inch 360 Hz field refresh rate ultra-HD 11,800PPI 2.15 um pixel pitch Liquid Crystal on Silicon (LCoS) micro-display panel with embedded 4x up-scaler is presented. In AR glasses for metaverse, spatial resolution is very important as Field of View (FoV) increases. The lack of spatial resolution interferes with the immersion of the augmented virtual space, such as limited information on image quality degradation and screen door effects. The display is proposed with new ultra-low power resolution enhancement technology of quadruple scaler to solve spatial aliasing caused by limited resolution at Augmented Reality (AR) glasses. The ultra-fine resolution pixel circuit is designed by new spatial interpolation technique called as micro-mirror space-interpolation (mmSI). The new micro-mirror architecture was proposed to make capacitive circuits network which produce interpolated pixel data and pixel mirror itself. The embedded spatial interpolation is done by pixel circuit itself and there are no additional circuits from video input to pixel driving. In this reason, the power consumption of driving the panel is same to full-HD resolution drivers’ which is only 100mW despite of quadruple resolution. The micro-display panel for metaverse AR glasses was fabricated using a 0.11- um CMOS process and was assembled with an LC front plane using VAN LC. The die size, active area and panel size are 11.65 mm x 7.75 mm, 8.25 x 4.64 mm² and 13.8 x 8.5 mm², respectively. The output video resolution is 3840 x 2160 with RGB eight-bit gray depth with 1920x1080 video input. The presented panel has 11,800 PPI with UHD video resolution only 0.37-inch diagonal active display area. The angular pixel resolution of the display is achieved at a 49 cycles per degree (cpd) resolution with 90-degree diagonal FoV for ultra-portable handheld AR glasses application.

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