New cheap OLED screen

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OutoftheBOTS_
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New cheap OLED screen

Post by OutoftheBOTS_ » Thu Nov 15, 2018 5:52 am

Usually the full colour OLED screen have been quite expensive but I now see the screens used in smart watches are now selling fairly cheap.

1.3" colour OLED 240x240 res https://www.aliexpress.com/item/1-3-inc ... 44276.html

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pythoncoder
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Re: New cheap OLED screen

Post by pythoncoder » Thu Nov 15, 2018 8:04 am

That is remarkably cheap. Someone would need to write a driver for the ST7789.

Existing colour OLED drivers are for the Adafruit displays which use SSD1331 and SSD1351 chips.
Peter Hinch

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deshipu
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Re: New cheap OLED screen

Post by deshipu » Thu Nov 15, 2018 8:31 am

That is not an OLED, it's a regular TFT, the same as https://www.adafruit.com/product/3787

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Re: New cheap OLED screen

Post by pythoncoder » Thu Nov 15, 2018 9:06 am

D'oh. So it is!
Peter Hinch

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Re: New cheap OLED screen

Post by OutoftheBOTS_ » Thu Nov 15, 2018 9:20 am

I have ordered 1 to find out.

I originally stumbled upon it when shopping for a smart watches and fit watches. Although most of the cheap ones use TFTs the slightly more expensive ones use OLED screens so I started to google them and found a number of manufactures making these see https://www.youtube.com/watch?v=zxhwS_i_osM

Ok now searching a bit more they r a IPS screen see http://nauticomp.com/tft-vs-ips-display ... ifference/ still much better than traditional TFT

As for a driver I was first going to see if I can drive it using Lobo display module just with a custom setup the same as I do with the ST7735 displays I have.

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Re: New cheap OLED screen

Post by loboris » Thu Nov 15, 2018 9:20 am

Chinese sellers often writes nonsense descriptions "IPS HD TFT ... LCD OLED Display" intentionally, to be found by search engines...

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Re: New cheap OLED screen

Post by pythoncoder » Fri Nov 16, 2018 11:08 am

Given the above bold text I'd say the probability of it being LCD is 75%. On the basis of cost I'd give it 95%.
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Re: New cheap OLED screen

Post by deshipu » Fri Nov 16, 2018 11:47 pm

I have it, it's a TFT. An OLED display of this resolution (and color!) would need much more electronics on the back to generate by the high voltage necessary to drive a whole row of LEDs. While the low-resolution mono OLEDs get away with a simple charge pump, and only need external capacitors, something like this would definitely need an inductor for the boost converter, and that is a relatively big and characteristically looking part

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Re: New cheap OLED screen

Post by loboris » Sat Nov 17, 2018 12:40 am

Color OLED modules with resolution 128x128, 1.5" are available for ~15 US$ (except at Adafruit, where it costs 2x more).
The controler is SSD1351, as far as I know, only SPI interface is available.
Back side usually looks something like this:
Image

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Re: New cheap OLED screen

Post by OutoftheBOTS_ » Sat Nov 17, 2018 5:36 am

pythoncoder wrote:
Thu Nov 15, 2018 8:04 am
That is remarkably cheap. Someone would need to write a driver for the ST7789.

Existing colour OLED drivers are for the Adafruit displays which use SSD1331 and SSD1351 chips.
It is an IPS screen.

IPS vs traditional TFT

IPS: Stable and Much Quicker Response Times, Wide Viewing Angles, High Transmittance(1 millisecond vs. 25 milliseconds), Better Color Reproduction and Representation and slightly lower power consupmtion.

So although not a OLED the price/DPI/image-quaity ratio is very good.

I have ordered 1 and will compare it to the 1.44" ST7735 TFT that I have as the price on both r nearly the same.

this one https://www.aliexpress.com/item/7PIN-7P ... ffbd0b9d7d vs this one https://www.aliexpress.com/item/1-3-inc ... 44276.html

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