Abstract
Image sticking in thin film transistor-liquid crystal displays (TFT-LCD) is related to the dielectric property of liquid crystal (LC) material. Low threshold value TFT LC materials have a weak stability and the free ions in them will be increased because of their own decomposition. In this study, the property of TFT LC material MAT-09-1284 doped with γ-Fe2O3 nanoparticles was investigated. The capacitances of parallel-aligned nematic LC cells and vertically aligned nematic LC cells with different doping concentrations were measured at different temperatures and frequencies. The dielectric constants perpendicular and parallel to long axis of the LC molecules ε⊥ and ε//, as well as the dielectric anisotropy Δε, were obtained. The dynamic responses and the direct current threshold voltages in parallel-aligned nematic LC cells for different doping concentrations were also measured. Although the dielectric anisotropy Δε decreased gradually with increasing temperature and frequency at the certain frequency and temperature in LC state for each concentration, the doping concentration of γ-Fe2O3 nanoparticles less than or equal to 0.145 wt % should be selected for maintaining dynamic response and decreasing free ions. This study has some guiding significance for improving the image sticking in TFT-LCD.
Highlights
The application of liquid crystal (LC) materials has widely permeated the display and non-display fields
We investigated the dielectric property of LC material MAT-09-1284 doped with γ-Fe2 O3 nanoparticles to explore how to improve image sticking in thin film transistor-liquid crystal displays (TFT-LCD)
The dynamic responses of LC material MAT-09-1284 doped with γ-Fe2 O3 nanoparticles in parallel-aligned nematic (PAN) cells for different concentrations were conducted and analyzed
Summary
The application of liquid crystal (LC) materials has widely permeated the display and non-display fields. The low threshold value LC materials are unsuitable for thin film transistor-liquid crystal displays (TFT-LCD) because image sticking always occurs [29]. We investigated the dielectric property of LC material MAT-09-1284 doped with γ-Fe2 O3 nanoparticles to explore how to improve image sticking in TFT-LCD. The dielectric constants ε⊥ and ε// can be obtained by measuring the capacitance of parallel-aligned nematic (PAN) cell under low voltage (less than the threshold voltage) and high voltage (greater than the saturation voltage) [35], respectively. The dielectric constants ε⊥ and ε// can be measured by the dual-cell method [37], namely, they are obtained by the LC layer capacitance of PAN cell for low voltage (less than the threshold voltage) and vertically aligned nematic (VAN) cell for high voltage, respectively. The dynamic responses of LC material MAT-09-1284 doped with γ-Fe2 O3 nanoparticles in PAN cells for different concentrations were conducted and analyzed
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