Study of electro-optical properties on in-plane switching vertically aligned liquid crystal display with polymer networks formed under non-uniform vertical electric field

• Main Authors: Yi-Wei Tsai, 蔡譯緯
• Other Authors: Tien-Jung Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/2dcrs3

碩士 === 國立臺北科技大學 === 光電工程系研究所 === 101 === In this thesis, the electro-optical properties of in-plane switching vertically aligned liquid crystal cell with polymer networks are particularly investigated. Monomers, TA-9164, UCL002, and NOA65, are utilized under the irradiation of ultraviolet light to form polymer networks. By means of the vertically non-uniform electric field on the cell, the pretilt angle with respect to the normal direction of the substrate can be tunable, which is not only dependent on the strength of electric field, but also on the monomer type and concentration. The morphology of polymer networks and their creation of the anchoring energy within the cell are also important factors for the monomer selection. The effect of polymer networks can be observed from transmittance-voltage curve and response performance. Among the experimental results, the cell with TA-9164 polymer networks shows the best optical properties and fastest response. However, the higher concentration of the monomer is introduced, the higher threshold voltage and maximum transmittance voltage are appeared because of the polymer networks density effect. Also, compared with the pure cell (E7), the transmittance of the cell with polymer networks is slight reduced due to the light scattering. So, the optimization of the electro-optical properties on the cell is required during the fabrication. In addition, simulations of effects of the pretilt angle and anchoring energy on the cell are simultaneously achieved, consistent with the measurement.