Emergence of TFT-LCD Display Technology
I am convinced that this proposed IEEE Milestone is appropriate recognition of the emergent TFT-LCD Display Technology 25 years ago. It addressed the need for large flat screen displays and the need to move away from CRT displays for ecological reasons as well as display quality reasons. However, I feel the proposal would benefit greatly from editing to improve the representation of the technology to both reasonably informed engineers and technologists and the general public which might enjoy museum like exposure to this technology that has had an almost certainly positive impact in their lives.
I too feel editing is needed: What does TFT mean? The writing is very much overdone with too much editorializing- "breathtaking", "vacillating companies" "major-league status" don't belong in the citation. The comments above on the RCA work have to be addressed as well.
Answering Mischa Schwartz’s question, TFT is an acronym of thin-film-transistor. As far back as 1968, Bernie Lechner of RCA first proposed to use TFTs in matrix array of liquid-crystal cells (later termed “Active Matrix ” by Peter Brody), but technologies to realize his concept did not exist at that time. There have been a long list of developments assisted for instance by the inventions of TN(twisted nematic) mode of operation and hydrogen-added amorphous silicon. Finally in 1988 Sharp achieved a 14” full-color full-motion display that can be used for television application.
Hiro Kawamoto, advocate
Thank you for the two suggestions for improvement in presentation, including suppressing "too much editorializing" which simply came from the display quality of the 14 TFT-LCD being far better than I had personally expected before and got emotional somewhat too much.
I appreciate kind suggestions and will add technical reference to give some quality specification numbers.
Thank you again.
I too agree that the citation needs to be modified as was suggested, and the issue with the RCA's Milestone and George Heilmaier's fundamental contributions need to be reconciled. The apparent non-public access location of the plaque should also me addressed.
Thank you for your suggestion to modify the citation
I have modified the citation, referring to RCA LCD group's beautiful pioneering work, and added a reference:B.J.Lechner, "History Crystallized_A First-Person Account of the Development of Matrix-Addressed LCDs for television at RCA in the 1960s",Information Display 1/08 p26-27
I tried to pay due respect to RCA LCD group I admire the most: their LCD research work on TV finished in 1969, according to Lechner's account, when I was still in the university, and I joined SHARP CRL in 1971 and started research on LCD for mini-calculator; on TFT-LCD for TV in 1984.
This is HISTORY.
Any modification and suggestion for improvement would be very much appreciated as I still have difficulties in English language as my second language.
I agree 100% with Juancarlos-san saying "we should be sure there are two different facts worthy of two different milestones."
1st. Essential key words of my proposal entitled "Sharp 14-inch thin-film-transistor display (-LCD) for , which has ushered in LCD industry" are:
3. liquid crystal display(LCD)
"another IEEE Milestone approved for the Liquid Crystal Displays, 1968" is for only for LCD: neither 14-inch LCD, nor 14-inch TFT for TV were feasible in 1968.
2nd. "another IEEE Milestone approved for the Liquid Crystal Displays" is what is quoted below: (http://www.ieeeghn.org/wiki/index.php/Milestones:Liquid_Crystal_Display,_1968)
"Liquid Crystal Display, 1968 Princeton, NJ, U.S.A., Dedicated 30 September 2006 -- IEEE Princeton and Central New Jersey Section
Between 1964 and 1968, at the RCA David Sarnoff Research Center in Princeton, New Jersey, a team of engineers and scientists led by George . Heilmeier with Louis A. Zanoni and Lucian A. Barton, devised a method for electronic control of light reflected from liquid crystals and demonstrated the first liquid crystal display. Their work launched a global industry that now produces millions of LCDs annually for watches, , in televisions, and ."
Below is a quote from "B.J. Lechner: History Crystallized_A First-Person Account of the Development of Matrix-Addressed LCDs_for television at RCA in the 1960s; Information Display 1/08 p26-30":
"During 1969, RCA abandoned entirely the objective of making a liquid crystal display: By 1969, RCA's color receiver business was matured and the smallest consumer product of significance was a 13-in. color set. Because we could not promise to compete with such a product in any foreseeable time frame, had no interest in investing further."
In 1969, RCA abandoned LC TV because 13-inch, minimum size for TV, color LCD did not seem to be possible in the foreseeable future; in 1987, Sharp adopted 14-inch to demonstrate TFT-LCD could be used for TV.
In 1975, Sharp started research and development work on TFT for LCD.
18 years between RCA 1969 and Sharp 1987 was required for LCD and to be developed good enough for LCD TV.