Henry Joseph Round

Henry Joseph Round (born June 2, 1881 in Kingswinford , Staffordshire , † August 17, 1966 in Bognor Regis , West Sussex ) was an English researcher. He is considered the inventor of the light-emitting diode .

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After studying at the Royal College of Science in London , he went to the USA in 1902, where he worked for Guglielmo Marconi .

After returning to England, he applied for his first patents in the field of communications technology around 1913. Further patents followed in the area of the tube and transmission technology that was current at the time. Round received a total of 117 patents.

The Marconi V24 electron tube was developed by Round in 1916 and was used in the Marconi Type 55 amplifier. This amplifier worked up to 1 MHz. This is why the V24 is the first HF triode.

light emitting diode

Replica of the Rounds experiment. A negatively charged needle tip on silicon carbide creates a green, glowing light-emitting diode transition

In 1907 Round discovered that inorganic substances can be made to glow by applying an electrical voltage. This round effect is the basis of today's LED.

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↑ Gerald FL Tyne, Saga of the Vacuum Tube, Prompt Publications, 1977, Chapter 11, pp. 222ff.

personal data
SURNAME	Round, Henry Joseph
BRIEF DESCRIPTION	English researcher and inventor
DATE OF BIRTH	June 2, 1881
PLACE OF BIRTH	Kingswinford , Staffordshire
DATE OF DEATH	17th August 1966
Place of death	Bognor Regis , West Sussex

[1] Gerald FL Tyne, Saga of the Vacuum Tube, Prompt Publications, 1977, Chapter 11, pp. 222ff.