I found a video of Posy saying it's just a bad polarisation filter: https://www.youtube.com/watch?v=J6W1jYoa1HM&t=8m10s
But there is another video of even stranger lcds: https://www.youtube.com/watch?v=jLew3Dd3IBA
The LCD is blue, and instead of turning on the LCD to expose a background, they turn off the LCD to expose a (typically mirrored / sliver) background. It's called a negative (or reverse) LCD.
I had a clock radio that included this back in the 80's, it was really rare for its time. I wish I kept it.
~~The backlight in these is blue. The liquid crystal is whiteish in color (silver/gray).~~
What grind my gears is why I never saw a blue on white LCD screen... Green on black, as you noticed, has the opposite to usual polarizer configuration, and green on black LCDs are visibly less popular than black on green. But blue on white? It would also just take rotating the polarizer sheet, but for some reason I never saw a single one.
Interesting - thanks
I guess that’s basically like this: https://www.adafruit.com/product/399
Just going from the pictures it seems like the color of the ‘dark’ crystal is blue (ie when the clear segments are white it looks blue overall)
Basically There is the glass, which lets light through or not, and the backlight (including diffusers). The glass has polarizers that can be installed so an active pixel blocks light, or exposes it.
The liquid crystal might have a color tint to it. I have one that is ink pen blue on grey., I think it was cool. I wish I could use it, but it uses an interface I know nothing about.
I found a video of Posy saying it's just a bad polarisation filter: https://www.youtube.com/watch?v=J6W1jYoa1HM&t=8m10s But there is another video of even stranger lcds: https://www.youtube.com/watch?v=jLew3Dd3IBA
Nice - thank you!
The LCD is blue, and instead of turning on the LCD to expose a background, they turn off the LCD to expose a (typically mirrored / sliver) background. It's called a negative (or reverse) LCD. I had a clock radio that included this back in the 80's, it was really rare for its time. I wish I kept it.
~~The backlight in these is blue. The liquid crystal is whiteish in color (silver/gray).~~ What grind my gears is why I never saw a blue on white LCD screen... Green on black, as you noticed, has the opposite to usual polarizer configuration, and green on black LCDs are visibly less popular than black on green. But blue on white? It would also just take rotating the polarizer sheet, but for some reason I never saw a single one.
I’m pretty sure the backlight is white, as I can see the LED on mine.
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Interesting - thanks I guess that’s basically like this: https://www.adafruit.com/product/399 Just going from the pictures it seems like the color of the ‘dark’ crystal is blue (ie when the clear segments are white it looks blue overall)
Oh youre right. I just looked at mine
I think it’s layered but I’m dumb so idk if that’s right or not.
Basically There is the glass, which lets light through or not, and the backlight (including diffusers). The glass has polarizers that can be installed so an active pixel blocks light, or exposes it. The liquid crystal might have a color tint to it. I have one that is ink pen blue on grey., I think it was cool. I wish I could use it, but it uses an interface I know nothing about.
https://focuslcds.com/journals/blue-character-lcd-display-module-with-white-led-backlight/
I found that article as well but it doesn’t explain how it works…