Study Of Non-volatile Display Based On Phase Change Materials

In the information world,people's demand for portable display devices with low power consumption,high resolution,and wide color gamut is increasing.Display technology based on phase change materials?PCMs?has attracted more and more attention and has broad application prospect due to its combination of ultrafast switching speed,high resolution,low power consumption and non-volatility.However,the current display technology based on PCMs is still in the early stages.Most of the research focuses on the color modulation capability,and there are few studies on angular performance and the electric-driven color modulation.To answer the above problems,this thesis proposes a phase change display based on a lateral electrical micro-heater,and demonstrated the feasibility of the color switching operation.The lateral pixel structure shows a significant change in reflected color before and after the application of electrical pulses.Compared with the conventional structure with vertical electrical configuration,the lateral electrical drive structure can achieve a more uniform phase change,allowing a large area display at the micrometer scale.In addition,we also studied the effect of ITO and GST on color modulation and used the spatial color mixing configuration to achieve more colors using combination of subpixels of with different thickness of ITO.In the course of study,we found that GST-based phase change displays rely on the thin film interference of the ITO layer to achieve high saturation of the reflected color,which has the disadvantage of angle dependence.Therefore,we have proposed a display structure based on Sb₂S₃,using strong interference effects to achieve angle-insensitive colors.It also forms almost perfect absorption characteristics at the resonance wavelength,which can produce high-purity colors.Finally,we presented three primary colors?Cyan,Magenta,Yellow?t based on the Ag/Sb₂S₃/Ag structure through experiments,realized the color switching through thermal excitation,and showed the angle insensitivity characteristics within a wide viewing angle range of 60 degree.