Integrated gate driver circuit with Oxide TFTs often suffers from the leakage current problem due to the depletion-mode TFT's characteristic. This paper analyzed the origin of circuit failure and proposed a leakage current cutting technique in which using output feedback to turn off the normally-on switches. The feedback scheme is designed not only within its own stage but across the neighboring stages. Compared with previous work, it avoids the degradation of the output caused by the feedback TFT, thus providing a more robust solution. The circuit is fabricated employing a-IGZO TFTs. The experiment result shows that the circuit works successfully with maximum -4.5V threshould voltage.

Waveguide liquid crystal display (WLCD) is a newly developed transparent display technology. Since polarizers and color filters are not necessary for the WLCD, high transparency is easily reached. Meanwhile, owing to the fast response time, field sequential color (FSC) can be applied to realize full color display. In this work, by optimizing materials and process conditions, we obtained lower driving voltage and higher contrast ratio than previously reported. These enhanced characteristics provide the possibility for designing larger size panel. Finally, we have developed an 8 inch full color transparent WLCD prototype and discussed the upgrading methods to improve brightness uniformity.

We have designed and fabricated the 14-inch RGBW AMOLED using tandem white-OLED with RGB color-filter. In this paper, we also verified the pixel compensation, RGBW conversion, white OLED color-compensation, and optical compensation, and the comparison of RGBW-quad and RGBW-stripe on this panel.

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In recent years, the transparent waveguide liquid crystal display (WLCD) technology attracted a lot of attention for the high transmittance. To further improve the display performance, the contrast ratio was systematically optimized in this work. A coarse‐grained model based on Mie scattering was established to perform the limiting theoretical analysis of the contrast ratio of polymer‐stabilized liquid crystal devices. To improve the contrast ratio, we tried different material formulations and optimized the UV polymerization process, and also applied light shielding layer to suppress metal lines reflection. Finally, the contrast ratio can reach to 18:1. With these improvements and the advantage on transmittance, it is believed that the WLCD technology will be applied in various intelligent IoT systems in the near future.