We investigated the image-sticking phenomenon of polymer-sustained-alignment liquid crystal displays (PSA-LCDs) by the evaluation of residual DC and the difference in tilt angle. Experimental results indicate that the difference in tilt angle affects the image sticking of PSA-LCDs more than the residual DC. We also found that the difference in tilt angle is strongly dependent on the chemical structure of the monomer that forms the polymer layer between the alignment layer and the liquid crystal layer by photopolymerization.

For the first time, we have developed a 60-inch diagonal size seethrough display using polymer network liquid crystal (PNLC) technology. The color display system by combination of the seethrough display and a projector enables distinguishing eye-catch effect. It creates new application of displays, such as information display, digital signage and substitution of window.

We have developed a long lifetime OLED display by optimizing each organic layer materials. The lifetime of the new developed blue OLED under 50 mA/cm 2 driving at 85 °C was improved more than four times compared with the previously developed OLED, and achieved longer than 1,500 hours in a real use. The developed OLED display would be useful for automotive application.

RGB side‐by‐side (SBS) top‐emission (TE) flexible OLED display with high efficiency and long lifetime has been developed for mobile and automotive applications. We have firstly developed a high reliability single‐type OLED display with a lifetime over 1,000 hours under 900 cd/m2 driving at 85 °C and with wide color gamut (over 110% of NTSC ratio). This is especially useful for the automotive displays. In addition, we have also focused on a blue TE tandem OLED for improving the current efficiency and achieved the blue index of 320 with two‐stacked tandem OLED. This is 1.6 times larger than that of the blue single‐type OLED.

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