Wide temperature range blue phase liquid crystals for displays

We report wide temperature range blue phase liquid crystals for display applications. Systematical analysis of the relationship of dielectric anisotropy value (Delta epsilon) and the blue phase liquid crystal (BPLC) temperature range shows that the BP temperature range increases as the Delta epsilon decrease. Additionally, we also find that as the chiral concentration of the blue phase increases, the BP temperature range decreases. The studied BPLCs also exhibit fast response time of 400 mu s using IPS cells with a fixed cell gap and electrode line and space of 10 mu m. These results can be explained based on the defect theory and would give effective guidance during the application of BPLC. Detailed physical, optical, dielectric and electro-optical study will be presented.