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uSupply Custom LCD
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mariush:
I was also thinking about that ... how many commons / anodes / cathodes such a display would have, how you're gonna multiplex those segments and still have some nice contrast

I was wondering if you couldn't just use some of these existing 8 digit 14 segment things (2$ each for 1000pcs) : https://www.digikey.com/product-detail/en/varitronix/VIM-878-DP-FC-S-LV/153-1113-ND/1118603  (or bigger ones for 3.3$ for 1000pcs

You have 8 digits, and you can write "A" or "V" on the 8th digit and use 6 digits for numbers, and you could also have  CV and CC  using two digits on a 3rd row where you'd also write the watts value.
And you wouldn't even have to connect all the segments for all the digits. If you're only gonna show numbers on first 6 digits, then you'd  have less traces to connect to your microcontroller or what's gonna be used.


ataradov:
If I'm not mistaken, LCD manufacturers offer COG controller, so you get a nice SPI interface to the display. Not sure how much it adds to the cost.

Driving this thing from am MCU will require 100-pin package, and is probably not going to be cheap.
EEVblog:

--- Quote from: ataradov on October 20, 2017, 05:58:21 am ---If I'm not mistaken, LCD manufacturers offer COG controller, so you get a nice SPI interface to the display. Not sure how much it adds to the cost.

--- End quote ---

A quote we got was $2 extra.


--- Quote ---Driving this thing from am MCU will require 100-pin package, and is probably not going to be cheap.

--- End quote ---

30 cent driver chip.
A Hellene:
Dave, though Nokia 5110 (PCD8544) is a small LCD (1.6", 84x48px), it is a standard 3-pim SPI (MOSI, SCK, nSS), transflective, sun-readable, extremely low power and quite cheaply available display. You can even use two of them...!

If you need more display real estate, there will always be the SPI TFTs, ranging from 1.8" 128x160px (like the one connected to the breadboard, depicted at the top right of the pictures at the link above) to any dimension & resolution you might wish.


-George
janekm:
Since I've been there/done that on custom LCD manufacturing (new batch of a design the previous supplier wasn't able to delivery at a reasonable cost / lead time), I can add a few points based on my conversations with a LCD factory (the factory was referred to me by my assembly house, as I wasn't quite willing to take the gamble on a "random" supplier):

* It's a really cut-throat market with a lot of competition to drive prices down. The factory owner I spoke to said that some of his competitors use factory labor to get labor costs down.
* The batch size of the factory I used is 5000 units, and their whole process is set up around that, so they totally hate doing anything not divisible by that. They did end up agreeing to do 3000 but really didn't like it.
* Turnaround time is 1 - 1.5 months, and they can't speed it up due to the many process steps.
* They were able to make samples to show that everything is correct (about 20 from what I remember). It seems these don't go through the regular factory process (they did end up looking slightly different and had a bit of a "hand-made" feel about them). Took about 3 weeks from what I recall.
* There are options regarding viewing angle range, contrast ratio etc. I told them I wanted the best visibility they could make and paid them a premium for that. They delivered, the displays are excellent.
* Cost was of course much lower than the previous US-sourced version, but I wasn't concerned with driving it to the bottom, quality was more important.
Dave, happy to give you a reference to the factory we used, though they only speak Chinese...
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