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Temkar N Ruckmongathan

Ruckmongathan (23rd February 1953) joined Raman Research Institute as an Electronics Engineer in the liquid crystals laboratory in the year 1978 and retired as a senior professor in the year 2015.

Early Years and Education

Ruckmongathan was born to Smt. Narasu Bai and Sri. Narasinga Rao on February 23, 1954 at Ootacamund (Ooty), The Nilgiris.  He had early education at Municipal High School, Ooty.  He mastered the art of perseverance and hard work while doing his bachelor of engineering (BE) at the PSG college of Technology, Coimbatore during 1971 to 1976.   He obtained master of engineering (ME)  from  Indian Institute of Science (IISc) , Bangalore in  1978. Further he acquired a PhD degree in 1988 under external registration program of IISc.


Ruckmongathan  joined Avionics Design Bureau, HAL  after obtaining  his masters degree at IISc.  His keen interest to  pursue a career in research led him to join Raman Research Institute as Scientist in November 1978.

He was expected to design and develop circuits to drive liquid crystal displays in the liquid crystal laboratory. He soon realized that he has to master the art of fabricating LCD and started fabricating liquid crystal displays with the help of K Subramanya. Several simplifications in the fabrication of LCD led to achieving defect free displays up to a size of 100mm x 100 mm and this effort was supported by Electronics Commission. Mean while, he explored and demonstrated new ways of driving liquid crystal displays and submitted his work to obtain a Ph D degree from the Indian Institute of Science. He became Professor in October 2002 and senior professor in 2009.

Scientific Work

Ruckmongathan’s research was focused on selecting and driving multiple rows in a matrix display. It was a radical departure from the conventional row at a time mode of driving matrix LCDs. The improved hybrid addressing proposed by him in 1988 is the basis of several addressing techniques that were popularly referred to as multi-line addressing techniques. LCDs in mobile phones that were sold during 1995 to 2005 were driven by selecting four rows at a time.

He solved the problem of “Mura” in LCDs to achieve uniform appearance of background pixels in LCD when he was in Philips, Heerlen, The Netherlands during 1989 to 1991.  He developed multi-line addressing techniques to display greyscales while Guest researcher at Asahi Glass R&D center, Yokohama,  Japan  during Aug. 1991 to Aug. 1993 to improve the performance of LCDs in notebook computers.  He doubled the frame frequency of ferroelectric LCDs to achieve video rates by selecting and driving pixels in two rows simultaneously with collaborators at Chalmers University of Technology, Gothenburg, Sweden in 1998. It was at a time when most researchers in the field had given up hopes of driving FLCD by selecting multiple lines because FLCD is a not RMS responding device and multiline addressing techniques were proven with RMS responding devices.   

Addressing techniques based on orthogonal transforms and wavelets proposed by him are based on his knowledge of signal processing. He improved the performance of matrix LCD with techniques to reduce the supply voltage of drivers, power dissipation in drivers, methods to display greyscale etc. He was supported by S. Abdul Majeed  and S Seshachala in the fabrication of drive circuits. A.R Shashidhara supported him by designing the electronic circuits, fabricating liquid crystal displays, and developing prototypes during the last decade of his service. He has also proposed methods to reduce power consumption of LED light sources in projection displays based on digital micro-mirror devices.


Ruckmongathan’s hobby is painting


Born 23rd February 1953
Field: Display devices and Signal

Raman Research Institute,

Alma mater PSG college of Technology, Coimbatore
Indian Institute of Science,
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