A new simple technique for manufacturing liquid crystal displays has been developed, which could help reduce the cost of the devices in which they are used. over large areas.
Although the traditional polymer rubbing method produces standard LC alignment, it has unavoidable and undesirable defects such as the generation of electrostatic charges and dust particles that interfere with the operation of the display, and even damage to the electronic components of the display. deliver While electrostatic charges increase failure rates, dust creates defects that seriously compromise device performance. Other issues include the need for multi-step processes and high temperature curing for coating. This has led to increased demand to replace this rubbing method with new non-contact techniques.
Among these techniques is the use of the latest 2D nanomaterials — graphene, hexagonal boron nitride (h-BN), transition metal dichalcogenides, and so on as alignment layers. However, they all have a built-in drawback due to the deployment of the chemical vapor deposition (CVD) method as the technique requires high deposition temperatures, precursors and by-products that are often hazardous or toxic. are Also, when the CVD method is used, unidirectional LC alignment is observed only over small regions.
A team of scientists from Center for Nano and Soft Matter Sciences (CeNS), BengaluruAn independent body of Department of Science and Technology (DSTConceived and implemented a new way of using 2D materials to overcome the drawbacks of existing methods.
Using H-BN nanoflakes as a specific material, a group consisting of Gayatri Pasharodi, Priyabarta Sahu, Dr. DS Shankar Rao, Dr. HSSR Matt and Dr. S. Krishnaprasad employed a method called The solution-based collection technique is called and found to be effective. In achieving LC alignment over a much larger area. They also found that the resulting crystals are quite robust and show no evidence of decay in LC orientation over several months.
Works published in Advanced content interface Formed the basis of an Indian patent application. Lead researcher Dr. Prasad They added that the non-conventional and contact-free route demonstration method for achieving LC unidirectional alignment is also very simple, scalable, flexible to adapt, and cost-effective.