Electronics > Projects, Designs, and Technical Stuff

uSupply Custom LCD

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max_torque:
Because you will be able to intuitively know if it's a max or min by it's position, rather than actually have to read the text!

Like on an analogue meter.  If the needle is hard over to the rhs of the gauge, it's bad, you don't need to actually read what the needle is pointing too!  On a mono colour display, simple physical positioning for intuition makes a big difference ime

mikeselectricstuff:

--- Quote from: KE5FX on October 25, 2017, 09:05:08 pm ---
--- Quote from: mikeselectricstuff on October 25, 2017, 08:54:05 pm ---
--- Quote from: KE5FX on October 25, 2017, 08:48:43 pm ---It only makes sense to use an antique fixed-segment LCD if you know you will not face any market competition.  It's a hobby project in that case, not a commercial one.

--- End quote ---
..or you care about power consumption.
Or long-term security of supply
Or cost.
Or sunlight readability.

--- End quote ---

I'm skeptical about the middle two, certainly.  When you design something with a weird part -- and a custom LCD is certainly a "weird part" -- you are at the mercy of your supplier, specifically future changes to their minimums and lead times.

--- End quote ---
Worst case you can take your design to another supplier, with suitable MOQ/leadtimes.
Custom glass is cheap once tooled, so you can afford to keep a decent amount of stock

--- Quote --- Cost-wise, the best way to attack that problem is just to assume that you'll have to hit alibaba.com every so often to find the next big load of surplus panels that someone's dumping on the market. 

--- End quote ---
And have to redesign due to a different connector or pinout or flex length. If you can still even get the same size and mechanical mounting detail. And take pot luck on quality.

--- Quote ---Power consumption... well, it's a power supply, isn't it?

--- End quote ---
A battery powered one.

KE5FX:

--- Quote from: mikeselectricstuff on October 25, 2017, 09:49:56 pm ---A battery powered one.

--- End quote ---

Might be a good application for E-ink, if factors like battery life and readability in sunlight are important.  There are usually plenty of surplus panels on the market. 

Something like this could be a great fit, if the pricing isn't too far out of line.  (Also, you couldn't backlight it if you wanted to, which isn't ideal.) 

Maybe I've missed it -- has anyone posted any actual quotes for custom LCD pricing in the thread?

Edit: hmm, 15 second full refresh time seems a bit excessive.

mikeselectricstuff:

--- Quote from: KE5FX on October 25, 2017, 10:32:13 pm ---
--- Quote from: mikeselectricstuff on October 25, 2017, 09:49:56 pm ---A battery powered one.

--- End quote ---

Might be a good application for E-ink, if factors like battery life and readability in sunlight are important.  There are usually plenty of surplus panels on the market. 

--- End quote ---
Probably not - E-ink is slow, but also has the risk that something's gone wrong/crashed, and the display is still showing 3v when the PSU is outputting 24V.
Basing a production design on surplus parts is also very risky, unless they are so cheap you can buy a reasonable lifetime's worth of stock.

EEVblog:

--- Quote from: mikeselectricstuff on October 25, 2017, 09:49:56 pm ---
--- Quote from: KE5FX on October 25, 2017, 09:05:08 pm ---
--- Quote from: mikeselectricstuff on October 25, 2017, 08:54:05 pm ---
--- Quote from: KE5FX on October 25, 2017, 08:48:43 pm ---It only makes sense to use an antique fixed-segment LCD if you know you will not face any market competition.  It's a hobby project in that case, not a commercial one.

--- End quote ---
..or you care about power consumption.
Or long-term security of supply
Or cost.
Or sunlight readability.

--- End quote ---

I'm skeptical about the middle two, certainly.  When you design something with a weird part -- and a custom LCD is certainly a "weird part" -- you are at the mercy of your supplier, specifically future changes to their minimums and lead times.

--- End quote ---
Worst case you can take your design to another supplier, with suitable MOQ/leadtimes.
Custom glass is cheap once tooled, so you can afford to keep a decent amount of stock

--- End quote ---

Yes. If the product for example starts selling well in the thousands then you can likely comfortably buy 10k or more stock giving you plenty of time to move the design files to another supplier if needed.


--- Quote ---
--- Quote --- Cost-wise, the best way to attack that problem is just to assume that you'll have to hit alibaba.com every so often to find the next big load of surplus panels that someone's dumping on the market. 

--- End quote ---
And have to redesign due to a different connector or pinout or flex length. If you can still even get the same size and mechanical mounting detail. And take pot luck on quality.

--- End quote ---

Yes. All those things factor in. The time and effort and doing that is at least equivalent if not more than simply giving the design files to another LCD manufacturer. Several if you aren't happy with the quality  you get the first time.

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