How LEDs Are Made 93
An anonymous reader writes "The SparkFun team took a tour of a factory in China that manufactures LEDs. They took lots of pictures showing the parts that go into the LEDs, the machines used to build them, and the people operating the machines. There's a surprising amount of manual labor involved with making LEDs. Quoting: 'As shipped on the paper sheets, the LED dies are too close together to manipulate. There is a mechanical machine ... that spreads the dies out and sticks them to a film of weak adhesive. This film is suspended above the lead frames ... Using a microscope, the worker manually aligns the die, and, with a pair of tweezers, pokes the die down into the lead frame. The adhesive in the lead frame wins (is more sticky), and the worker quickly moves to the next die. We were told they can align over 80 per minute or about 40,000 per day.'"
Somewhat off-topic: why not uncut LED panels? (Score:4, Interesting)
I suspect this story may draw comments from people who know something about LED manufacturing. If so, I hope someone can answer this question. I noticed that panels of LEDs, such as used for traffic lights or stage lights, are composed of 200 individual LEDs. So the process is:
Cut one LED panel apart, into hundreds of LED cores.
Glue hundreds of leads to the hundreds of fresh cut cores.
Align hundreds of cores into hundreds of little molds.
Inject resin into hundreds of little modes.
Assemble all of the hundreds of resin-covered LEDs back into a panel again.
Why not this?:
Attach ONE set of leads to the LED silicon panel.
Dip the whole dang panel in resin.
left out the most important steps (Score:5, Interesting)
Re:Cheap labor versus automation (Score:4, Interesting)
--American unions are changing their priorities. Appliance Park's union was so fractious in the '70s and '80s that the place was known as "Strike City." That same union agreed to a two-tier wage scale in 2005--and today, 70 percent of the jobs there are on the lower tier, which starts at just over $13.50 an hour, almost $8 less than what the starting wage used to be.
--U.S. labor productivity has continued its long march upward, meaning that labor costs have become a smaller and smaller proportion of the total cost of finished goods. You simply can't save much money chasing wages anymore.
Your article glides over this very quickly, but it's worth discussing further.
Management has essentially halted the growth of wages for decades and this has allowed all the productivity gains to accrue to business profits.
The knock on effects have ripped through the economy, from skewed stock valuations to screwed workers' debt loads.
http://tcf.org/assets/images/blog_images/20120814-graph-of-the-day-does-productivity-growth-still-benefit-the-american-worker.png [tcf.org]
You can find other graphs that break down the wage growth by percentile (20th, 50th, 95th) and it's pretty much exactly what you'd expect.