Let's Drive LCD - Extras


Inspired by Wenting, I too have developed an affection for flat-panel displays. However, since the 2010s, the industry has gradually phased out these models, leading to a decline in usage. When I began exploring embedded development in 2012, the most popular display module for beginners was still the Nokia 3310. Today, however, the kids are working with ST7789V IPS RGB LCDs, boasting a PPI of 260 as their first display. It's incredible how much things have changed! There's a saying: "Things become desirable once they're obsolete." A new generation of tech enthusiasts will come to appreciate the unique aesthetic qualities of these older technologies without having to endure their limitations in daily use. In an era when we all carry ultra-high-performance flat-panel displays in our pockets, these vintage modules certainly have a nostalgic appeal that can be appreciated for their design.

This is a post of me driving the mysterious LCD or other flat-panel display modules I have in the bin. A certain amount of reverse engineering is involved. If a module is too special, I'll post about it separately. 

Warning: I do not guarantee the information provided here; do not use them in production!

Resources:

Check out Wenting's webpage (https://www.zephray.me/) and his repo (https://gitlab.com/zephray/driving-lcds) for information about many other LCD modules.

Also, check out this mysterious spreadsheet on the die size of display controllers. This information can help us identify unknown controllers.

Mitel 5230e IP Phone





Markings: SGD SOLOMON Goldentek GY3216N6FTW6A2 / 57009611 150714BA 94V-0 311000638
Resolution: 320x160, PPI≈63
Controller: IST3225TA0 (LH1560 compatible?[2]) + Unknown
VDD: 3.3V
AK: 3.3V
VHI: 20V
Pinout: FLM, AC, LP, XCK, ~DISPOFF, D0, D1, D2, D3, VDD, GND, VHI, GND, NC, A, K
References:
  1. A seemingly related module： https://www.digitallehrer.de/files/digitallehrer/upload/Produkte/pdf/LCD-Displays/ymc320240-68.pdf
  2. http://www.dab.hi-ho.ne.jp/jn99/lcd/lcd2.html
  3. Illustration by はなだひょう (Nebulastall) 

Cisco IP Phone 7915 Expansion Module

 
Markings: EDT REV.A 40-90076-7 50-60011-8 (BLE2894) SYE11825A4266
Resolution: 
Controller: Unknown
VDD: 3.3V
Pinout: 
01~10: GND GND VDD VDD NC NC NC D0 D1 D2
11~20: D3 D4 NC NC D5 D6 D7 NC NC NC 
21~30: NC NC NC NC NC NC NC NC GND XCK
31~40: AC? HS VS DISPON NC 24.6V 23V 21.36V 3.3V Contrast




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