In this paper, we present world-first TFT liquid crystal glasses (TFT-LCG) that display images to the passersby and have limited obstruction to the vision of wearers. By the concept of manipulating the polarization state of incident light with the liquid crystal, the appearance at the world side of the glasses is electrically controlled. The glasses display colored images with resolution of 36 pixels per inch and contrast ratio over 15. The viewing angle of wearer is almost the same as existing glasses and keep high MTF performance with TFT pixel traces. The driving power of the TFT-LCG is lower than 100mW with frame rate of 10 fps. Integrated with virtual platform and wireless control, the glasses can serve as a novel interaction medium between individuals. It opens a new path for how people connect with each other.
We proposed a reflowable liquid crystal (LC) geometric phase element for vertical cavity surface emitting laser (VCSEL) projector. By photo alignment technology and LC one drop fill process, we realized an active LC geometric phase element and pattern switchable VCSEL projector. According to geometric phase distribution, the incident light was transformed into different light distribution, such as flood pattern, beam multiplication, or wider illumination. When voltage was applied, all LC directors aligned perpendicularly to substrates and the geometric phase distribution vanished. Therefore, the output light remained as the original projecting pattern. Due to narrow wavelength range of the VCSEL, the optical performance, such as diffraction efficiency and phase difference, was not decayed by the dispersion of geometric phase. We made a record of 3 × 3 mm LC cell with our in-house ink-jet printing system. The transmittance was over 95%, and the switching time was <5 ms.
We propose a novel 2-in-1 pattern projector, which consists of a Dot projector and an LC diffuser. The LC diffuser is made of switchable Microlens Arrays (MLA) based on geometric phase. The LC diffuser can switch between “no lens power” and “MLA” mode. In “no lens power” mode, the Dot pattern is not affected by the LC diffuser. In “MLA” mode, the focused Dot pattern is “blurred” by the MLA, which generates the Flood pattern. The eigen mode of geometric phase MLA is carefully designed to achieve polarizer free modulation. We implement this novel modulation concepts with the world smallest and 1st ever reflowable LC cell. We made a record of 3x3mm LC cell with our in-house IJP system. The optical efficiency is over 95%, and the switching time is less than 5ms.
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