Study on the Electro-Optcial Properties of GH LCD
It’s the first time to have a research on the electro-optical properties of GH-LCD more systemic. At the beginning of the paper, the electro-optical characteristic curves have been analyzed for the different cell thickness, such as 6μm, 9μm and 11μm. The result shows that GH-LCD and TN-LCD have the similar electro-optical property, and the dichroic dye contained in the GH-LCD is the key to control the color switch. Viewing angle property in the range of ±30° was tested in the horizontal direction. The visibility of the left angle is wider than the right angel, and the contrast of the left angle is better. Then, the case that the orthogonal orientation of liquid crystal cell thickness is 11μm will be discussed in the paper. When the cell thickness is 11μm and there’s no polarizer, the electro-optical characteristic curves was measured and compared. Research shows that the polarizer can filter out polarized light to enhance contrast. The electro-optical curve with polarizer has been measured when a certain percentage of the chiral agent was added into guest-host liquid crystal (negative). When the voltage gets to 15V, there is a state of phase change that the display color immediately turns from black to milky white. Compared with liquid crystal without being added chiral material, the contrast reduces obviously, but response time becomes lower than before. The research on electro-optical properties maybe makes the GH-LCD to be applied to the naked eye 3D display.
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
R. L. Zhang et al., "Study on the Electro-Optcial Properties of GH LCD", Advanced Materials Research, Vols. 284-286, pp. 2234-2238, 2011