Tech

Indian scientists develop new way to produce LCD devices at lower cost

A new easier technique for manufacturing liquid crystal displays has been developed, which can reduce the cost of the devices.

An essential requirement of liquid crystal devices (LCDs) is the unidirectional planar alignment of the constituent liquid crystals (LC) over large areas.

Although the conventional polymer rubbing method yields quality LC alignment, it possesses unavoidable and undesirable drawbacks such as production of electrostatic charges and dust particles that interfere with display operation, and even cause damage to the electronic components of the display. While electrostatic charges increase the failure rate, dust creates defects which seriously compromises with the performance of the device. Other problems include multistep process for coating and the necessity for high-temperature curing. This has led to a surge in demand to replace this rubbing method with new non-contact techniques.

The latest among these techniques is to employ 2D nanomaterials — graphene, hexagonal boron nitride (h-BN), transition metal dichalcogenides, and so on as alignment layers. However, all these have a built-in lacuna owing to the deployment of the chemical vapour deposition (CVD) method as this technique necessitates high deposition temperature, necessity for precursors and by-products that are often hazardous or toxic. Besides, when the CVD method is used, unidirectional LC alignment is observed over only small regions.

A team of scientists from the Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru, an autonomous institute of the Department of Science and Technology (DST) conceptualized and implemented a novel way of employing a 2D materials to overcome the drawbacks of current methods.

Using h-BN nanoflakes as the specific material, the group comprising Gayathri Pisharody, Priyabrata Sahoo, Dr. D.S. Shankar Rao, Dr. HSSR Matte and Dr. S. Krishna Prasad employed a procedure called solution-processed deposition technique and found it to be effective in getting the LC alignment over a much larger area. They also found the resultant crystals to be quite robust with no evidence of decay in LC orientation over several months.

The work published in Advanced Materials Interfaces formed the basis for an Indian patent application. Lead researcher Dr. Prasad added that the method demonstrating a non-conventional and contact-free route for getting unidirectional alignment of LC, is also much simpler, scalable, flexible for adaptation, and cost-effective.

Publications link: DOI: 10.1002/admi.202200486

IN Bureau

Recent Posts

“Are there two laws in this world?”: Former Union Minister MJ Akbar raise concern over global inaction, hypocrisy on terrorism

Former Union Minister MJ Akbar, part of the all-party delegation led by BJP MP Ravi…

7 hours ago

PM Modi meets Australian Dy PM Marles; lauds 5 years of Strategic Partnership

New Delhi [India], June 4 (ANI): Prime Minister Narendra Modi met with Australian Deputy Prime…

7 hours ago

Relentless in Adversity: Indian Army leads search, rescue operations in North Sikkim

In the aftermath of the devastating landslide that struck North Sikkim, the Indian Army has…

9 hours ago

Google pauses ‘Ask Photos’ AI Feature to address performance issues

In a move that has raised eyebrows in the tech community, Google has decided to…

10 hours ago

Australian Defence Minister Marles makes first ‘port of call’ at ‘chai’ stall in Delhi

Tapping into a typical Indian habit of starting one's day with tea, Australia's Deputy Prime…

10 hours ago

Paank slams Pakistan over extrajudicial killings in Balochistan; bodies of abducted found in Kalat

Paank condemns the extrajudicial killings of Samiullah, son of Muhammad Hanif, and Bismillah, son of…

10 hours ago