Hee-Seop Kim

Ultrafast switching of randomly-aligned nematic liquid crystals.

We propose an ultrafast nematic liquid crystal (LC) device without alignment layers, where both the dark and bright states can be realized by applying an electric field. A vertical electric field is applied to vertically align the LCs for the dark state, whereas an in-plane electric field is applied to homogeneously align the LCs for the bright state. We achieved a total response time of less than 3 ms in the proposed device. This device may contribute, not only to a significant improvement of the switching speed in liquid crystal devices, but also to the simplification of the device fabrication by the omission of the alignment layer coating and the rubbing process.

57.5: Improvement of Mura on Diagonal Direction for VA Monitor

We described the mechanism of improvement of “Mura on Diagonal Direction”. Mura on Diagonal Direction (Diagonal Mura from now on) occurred by “Stress-Induced Birefringence” which is caused by spatial temperature variation. We suggest the way of improvement of Diagonal Mura by following three methods. 1)Improvement of spatial temperature variation of BLU(Back Light Unit). 2)Reduction of heat stress on glass by means of change the configuration of compensation film of polarizer. 3)Using glass with low photo-elastic coefficients to reduce stress-induce birefringence.