JJ wrote:
On Sat, 6 Apr 2019 12:39:13 -0700 (PDT), AK wrote:
Does anyone use a anti blue screen protector?

They are rather expensive.

Thanks,
Andy

Not worth it, IMO. Because it doesn't solve the problem which causes the
BSOD in the first place. It's like ignoring a court order that'll always end
up in a bad way.

There's two ways to do what I think he is referring to.

1) Aftermarket filter addon to be placed in front of LCD monitor screen

https://www.amazon.com/EYES-PC-Block.../dp/B00OL26BVK

Which is a bit silly, in that it places yet another layer in front
of the screen, there will be parallax, and so on. It likely attenuates
all colors a little bit, and stronger on blue attenuation. It would be
as miserable as the old "glare" filters they tried to pawn off on us.

2) Electronic feature of monitor itself.

This one is adjustable, and you can change modes as a function
of the intended monitor usage. On "book reading", blue can be
turned way down, as it's a black&white task. But this might mean
buying a new monitor, which costs more than (1).

https://www.viewsonic.com/uk/product...-light-filter/

The problem with one source of LED light, is it's a blue-emitting
source, with a phosphor over top of it to "whiten" the color. This
means there is a significant blue spike in the spectrum of the output.
The higher the color temperature of a "white" LED, the more blue
is in it, and the less phosphor they place over the LED square.

There are a variety of LED backlight methods. The cheap
methods likely cannot be adjusted.

If on the other hand, the light source is actually RGB-like, you
could adjust the balance of the three light sources, to achieve
various color-temperatures.

Virtually all current illumination methods are "spikey". The
spectrum is never smooth. A common ordinary incandescent bulb
has a smooth spectrum, but it kicks off a hell of a lot of
heat, and would cook an LCD panel from behind. The methods
we use today are "cool lighting" methods (CCFL/LED), and the
spikey output, with the blue spike in it, is the price we pay
for making other aspects of the screen work for years
on end.

*******

As for whether this effect is real, the eye may seem
pretty simple conceptually. But there seem to be an
awful lot of corner conditions on its operation. And
maybe some will be more affected by blue light than others
(vision already compromised for some reason).

A person could switch to an OLED display, but I don't know
how practical that is. I believe those are a direct emitter
and don't use backlighting, so there might be some room for
adjustment on the output.

Paul