Tag: LCD > Made up in Britain: LCD : George Gray 1972
Inventor George Gray
George Gray
Born4 September 1926
Denny Scotland
Died12 May 2013 | Age 86

Liquid Crystal Display

George Gray 1972

George William Gray was born in Denny, Scotland 4 September 1926.
In 1972 a team led by George Gray at the Royal Radar Establishment developed a new type of cyanobiphenyl. This resulting liquid crystal was less viscous, thereby providing faster response times and more transparent, which produced a pure-white colour display for the first time.

Re-invent the Display
LCD Calendar and Weather display
LCD Calendar and Weather display

John Stonehouse, who was the Minister of Technology, put out a challenge to find an alternative to the shadow mask colour TV tube.
This challenge was taken up by Cyril Hilsum at the Royal Radar Establishment (RRE) in Malvern Worcestershire, to explore whether the discovery by US researchers that a thin layer of impure liquid crystal could be used to make a crude optoelectronic display but the DSM design worked poorly and proved to be too power hungry.

Concurrently, in 1971, researchers in Switzerland had discovered a new display mechanism, the Twisted Nematic effect. This was a pure field-effect and did not require the presence of impurities, and George focused on finding new materials for this.

The liquid crystal materials known then had to be heated to 70ºC or more, usually decomposed in a few minutes and were rather viscous, which made their response sluggish. Invariably they comprised two benzene rings joined by a double, or triple, bond linkage that was easily broken by photolysis or hydrolysis.
George Gray LCD using cyanobiphenyl compounds
George Gray LCD using cyanobiphenyl compounds

George’s defining achievement was to use his deep knowledge and long experience of liquid crystals to eliminate this linkage entirely and to synthesise a number of biphenyl molecules, with a cyano group at one end, two directly coupled benzene rings in the middle and an alkyl chain of a defined length at the other.

Cyanobiphenyl Compounds
Three of these cyanobiphenyl compounds were liquid crystalline over a narrow interval at around room temperature and these were revealed to the world 50 years ago in a scientific publication on 22 March 1973. Working in collaboration with scientists at the RRE, led by Peter Raynes, further compounds were synthesised and evaluated.
These cyanobiphenyl compounds had a low viscosity, proved extremely stable (as George had predicted) and, formulated as eutectic mixtures, they could remain liquid crystalline from -10ºC to +60ºC.

These were patented and subsequently licensed by the MOD, through the aegis of Cyril Hilsum, since the university baulked at the costs and risks involved. They were then published in the peer reviewed scientific literature. In 1990 Gray moved to Merck Chemicals.

Turning Point
This turned the field of research on LCDs into an expanding international activity, with adequate supplies of the materials being available, under licence, from Merck Ltd (then BDH Ltd), due to the foresight of Ben Sturgeon, their Research Director.
Many companies exploited George’s materials in their LCDs, the most successful being large Japanese corporations.

Early seiko watch
Early seiko watch

Gray was the recipient of the 1995 Kyoto Prize for Advanced Technology, often referred to as the Japanese Nobel Prize.

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In History
  • 21 September 1936.
    This month 87 years ago the world lost Frank Hornby
  • 01 September 1976.
    This month 47 years ago the world lost Percy Shaw
  • 10 September 1960.
    This month 63 years ago the world lost Harold Gillies
  • 01 September 1806.
    This month 217 years ago the world lost Edward Nairne
  • 21 September 1836.
    This month 187 years ago the world lost John Stafford Smith
  • 01 September 1846.
    This month 177 years ago the world lost Edwin Beard Budding
  • 25 September 1936.
    On this day 87 years ago William Horlick
  • Christmas Cracker. 200 years ago 18/10/1823 Tom Smith was born
  • 17 September 1877.
    This month 146 years ago the world lost William Henry Fox Talbot
  • 18 September 1938.
    This month 85 years ago the world lost William Fletcher
  • Marshall Amplification. 100 years ago 29/7/1923 Jim Marshall was born
  • 10 September 1938.
    This month 85 years ago the world lost Charles Cruft
  • 18 September 1967.
    This month 56 years ago the world lost John Cockcroft
  • 16 September 1890.
    This month 133 years ago the world lost Louis Le Prince
  • 50 years ago in 1973 The first stable LCD is announced to the world.
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