Keyvan Sayyah is a notable inventor based in Los Angeles, CA. He has made significant contributions to the field of photoconductive structures, holding a total of 3 patents. His work focuses on enhancing the performance of liquid crystal technologies.

Latest Patents

One of his latest patents is a method of fabricating an isolated pixel photoconductive structure. This innovation involves providing a photoconductive substrate that voltage modulates a liquid crystal layer in response to input light. The substrate is designed with electrically isolated pixels to eliminate the lateral spread of charge carriers, thereby increasing the dynamic range of the liquid crystal light valve while preserving resolution. The partitioning of the substrate is achieved by forming an interconnecting network of deep trenches filled with insulating material, such as silicon dioxide. Additionally, the opposite surface of the substrate is etched to expose the silicon dioxide in the trenches, creating partitions that extend completely through the substrate.

Another significant patent is the MOS light valve with nematic liquid crystal operating in the surface mode. This light valve includes a layer of liquid crystal, a MOS substrate structure with a dielectric layer and a semiconductor layer, and an optically isolating mirror positioned between the liquid crystal layer and the substrate structure. An external AC biasing voltage is applied across the MOS substrate and the liquid crystal layer. The liquid crystal layer is sufficiently thick to operate in the surface birefringent mode, achieving a high contrast ratio and a short response time to changes in the write-in light beam when a sufficiently high biasing voltage is applied.

Career Highlights

Keyvan Sayyah is currently employed at Hughes Aircraft Company, where he continues to innovate in the field of photoconductive technologies. His work has been instrumental in advancing the capabilities of liquid crystal devices.

Collaborations

He collaborates with Chiung-Sheng Wu, contributing to the development of cutting-edge technologies in their field.

Conclusion

Keyvan Sayyah's contributions to the field of photoconductive structures and liquid crystal technologies highlight his innovative spirit and dedication to advancing technology. His patents reflect a commitment to enhancing the performance and efficiency of optical devices.