LCD Specification - nolanhergert/HeadlightBlocker GitHub Wiki
| Display Type | LCD, >2" and <3" Likely FSTN or DSTN, but maybe IBN/VA (vertical alignment) mode for darker darks. Not: TFT (MOQ from Hannstar is 400K for custom size monochrome TFT, there may be display artifacts too) and TN (too low contrast without corrective film) See https://github.com/nolanhergert/HeadlightBlocker/wiki/LCD-Theory |
| Viewing Direction | 6:00, with ~15 degree bias (draw). What is view angle? (range) 
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| Display Mode | Transmissive, normally white / positive mode |
| Dot Arrangement / Resolution | "Easy" answer is a graphical display with one pixel per square mm. Probably 10 backplanes and 20 segments. However can optimize portions other than directly ahead gradually down to one pixel per 5 square mm. Trying to balance requirements of density, pin count, pupil distance compensation, and cost. |
| Module Size | Rayban Wayfarer style for now. ~30mX40mm. |
| Color | Monochrome |
| Driver IC | Chip-On-Glass is a must. 2 X ST7056C preferable. Other option is ML1001 or ML2002 or equivalent. (custom driving algorithm) Combine channels 1 and 2 data together (80 bits long shift), but expose FCS so I can switch to CH2 being backplane Tie Vee, Vss, V1, SHL1, SHL2 all to GND |
| Operating Temp | -10C - 60C |
| Storage Temp | -30C - 80C |
| Back Light | None |
| Film | No diffusion film, should have high optical clarity (see-through). High transparency |
| Lens Material | Needs to not yellow over time. Glass for prototype is fine, PC/PMMA might be preferable long term for impact resistance. Try flexible if possible. |
| Tolerance | ± 0.50mm |
| Connector | ~.3mm pitch is ideal. FH35C-9S-0.3SHW(50). It accepts connections from top and bottom somehow, so it allows left and right lens to use same one-sided FPC gold finger design. Zebra elastomer strip disallows bending, which will happen in this form factor. |
| Voltage |
TODO! The "knee" voltage of display for FSTN. Needs to be able to work from 3V down to ~2.3V ideally. So you can run lic down to bottom without boosting. Any disadvantages to this voltage? Need to do the math/simulation/real-life testing though, haven't done that yet! The LCD glasses I have will go down to 2.0V no problem, so this probably just slows down responsiveness. |
| Polarizer | Standard polarizer. TODO: Confirm desired polarizer orientation on back and front before and after flipping horizontally when looking at other lcd screens and reflective glare and viewing angle / direction. On your glasses the blocking flipped vertically when you flipped the lens horizontally. I bet that I can have ITO pattern the same on left and right, but need to tweak polarizer orientation between left and right. Need to confirm |
| ITO Trace Resistance | I read 25 ohm max on ML1001. Seems minimum for what I need. Try 5-10X less if possible to see if visual artifacts form and provide backup for 25 ohm ("faster" switching freq, less power lost to resistance) |
View of Dyneye prototype: http://www.youtube.com/watch?v=cSOoYN_iOBY
View of Dyneye blocking sun: https://www.youtube.com/watch?v=PTG62q7hMcY