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.
XR (Extended Reality) glasses have many problems to overcome, such as MTP (Motion-To-Photon) delay and optical artifacts. We introduced a hardware and software co-design approach to solving the MTP issue. We applied it successfully to FSC (Field Sequential Color) LCoS (Liquid Crystal on Silicon) micro-display controller SoC (System on a Chip) design to reduce the MTP latency significantly down to less than 5 msec and to mitigate color break-up. A commercial AR (Augmented Reality) device available in the market embeds our solution. Our near-zero MTP delay display solution shows that smartphone/compute device tethered XR viewers or HMDs (Head Mounted Displays) could enhance user experience along with SLAM (simultaneous localization and mapping) or image processor. A localized optic artifact compensation scheme has also been applied to a waveguide optic, reducing AR optic design iterations.
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