LCD screen manufacturing process simplification?

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SUMMARY

The discussion centers on the limitations of current LCD manufacturing processes, specifically the use of Chip-On-Flex (COF) and Chip-On-Glass (COG) technologies for connecting subpixel transistors to driver chips. Participants highlight that while transparent transistors can be manufactured on LCD glass, their low quality restricts their use for demultiplexing signals. Suggestions for innovation include the potential to apply a layer on the edges of the LCD screen to accommodate faster transistors, referencing successful implementations of microprocessors on glass substrates.

PREREQUISITES
  • Understanding of LCD technology and pixel architecture
  • Familiarity with Chip-On-Flex (COF) and Chip-On-Glass (COG) construction methods
  • Knowledge of transparent transistor technology and its limitations
  • Basic principles of photolithography in semiconductor manufacturing
NEXT STEPS
  • Research advancements in transparent transistor technology for display applications
  • Explore innovative materials for enhancing LCD performance
  • Investigate photolithographic techniques for etching complex circuits on glass
  • Study the integration of microprocessors on transparent substrates and their implications
USEFUL FOR

Display engineers, LCD manufacturers, researchers in semiconductor technology, and anyone interested in advancements in transparent electronics and display optimization.

Cybersoya
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Hello

I am no expert so i apologize if the answer is trivial.I was wondering, if they can manufacture a transparent transistor on every (sub)pixel of LCD glass screen, why are they using "COF (Chip-On-Flex) or COG (Chip-On-Glass construction)" to connect every (sub)pixels' tiny wire at the end of row/column with LCD driver chip? Wouldn't it be much easyer to align neccesary tiny wires with connectors, if (non)transparent demulitplexer circuit was photolithographically "etched"(at the same time as pixel transistors are etched), so that connetcing wires leading to driver chip could be less tiny, less in number, and so easyer to connect (with less throwaway LCDs)?
I am only talking about physical connection of (individual column/row) LCD glass wires -to- (silicon)chip wires, i know that further down only few signal wires are needed to drive LCD.Thanks for answers.
 
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The transistors that can be manufactured on glass are of low quality. They are adequate to turn the pixel on and off, but they are too slow and too weak to do the demultiplexing.
 
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Thank you for answer.

That's a pity. Wouldnt it be nice, if they were searching for innovation in this direction, maybe to "evaporate" or "spray" extra layer of some substance on edges of LCD screen, that would enable them to put real/fast transistors on top of it.
For instance, I've heard that in Japan they managed to put entire Zilog Z80 microprocessor on a transparent glass substrate, albeit it was bigger than ordinary Z80 die - but "macroscopic" size of transistors wouldn't matter for LCD screen if they were put at the edges, i think.

http://www.z80.info/sharp/z80_glas.htm
https://original.sharpmz.org/z80glass.htm
 
Cybersoya said:
That's a pity. Wouldnt it be nice,
If wishes were fishes...
 

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