Effect of nickel oxide doping on the optically driving liquid crystal display

The optically driving liquid crystal display (ODLCD) realizes display function by controlling the alignment directions of liquid crystal (LC) molecules under exposure light,which has applications in electric-optic (E-O) devices. However,it is still limited to the laboratory for its long rewriting time and response time of the ODLCD. In this work,the composite film with Nickel oxide(NiO) and azo dye (SD1) was fabricated,and the rewriting time and the response time of ODLCD depending on SD1 with NiO doping were studied. Meanwhile,the SD1-NiO distribution and morphology were discussed by scanning electron microscopy (SEM),transmission electron microscopy (TEM),and atomic force microscopy(AFM) images,respectively. The results show that the nanoparticle size of NiO increases with the concentration of NiO- SD1. Among the different ratios(1:0 to 1:0. 1)of SD1-NiO concentration, the ratio of 1:0. 08 is optimal and a minimum rewriting time of 6. 8 s has been reached. Besides,for the conventional electricity driven LCD application, the response time of ODLCD can be decreased to a maximum value of 5 ms at the optimal ratio(1:0. 02)between SD1 and NiO.