Re: Screen Shade/curtain?

enes sarıbaş

however joseph, This fact doesn't change the fact that 99% of sighted people cannot breach the screen privacy features of screen readers. Heck, I used to turn on keyboard help to prevent people from pressing keys when I was away from my pc. A sighted person is extremely unlikely to know how to re-enable the screen. Most users, unless they are advanced users, are totally hopeless when they cannot see the screen.

On 12/18/2017 5:20 AM, Joseph Lee wrote:


Rebuttal: privacy these days is something you don’t really “see”. Take advanced malware, for example that can take a look at what you’re doing without raising suspicion and no need to keep the monitor on. That’s the point I’m getting at. Screen shade is just one piece; others are user attitude, programs (both good and bad), and the target or info one is looking at.




From: [] On Behalf Of David Moore
Sent: Sunday, December 17, 2017 5:52 PM
Subject: Re: [nvda] Screen Shade/curtain?


I did not think about the fact that a sighted person can look over their shoulder for prying eyes.

That is a great point! Good come back LOL!

I like good debates and discussions, because I just learned something right there!

David Moore

Sent from Mail for Windows 10


From: Kevin Chao
Sent: Sunday, December 17, 2017 8:40 PM
Subject: Re: [nvda] Screen Shade/curtain?


Screen shade is useful for protecting confidential work information, which we may not know about prying eyes, and a sighted person can see when someone is looking over their shoulders.


On Sun, Dec 17, 2017 at 5:27 PM Gene <gsasner@...> wrote:

As far as I know you can't just turn off the screen in the Windows settings and doing so may cause you real trouble if you can do it.  If you unexpectedly need sighted assistance, to deal with some sort of maintenance or performance problem, the screen should be on. 


The screen shade has the advantage that the screen is still on and a sighted person can work with the machine if needed.


----- Original Message -----

From: David Moore

Sent: Sunday, December 17, 2017 7:02 PM

Subject: Re: [nvda] Screen Shade/curtain?


I agree that we should only have features in screen readers that many people will really need, and will help them do a job. Many features in some screen readers are just not needed. You do not need a feature to do searches for you, when you can do a Google search. You don’t need this screen shade, because you can just turn off your screen in the Windows settings.

I really don’t know why anyone needs screen shade.

It is a useless feature, I think. How important is that for someone to be employed. We need screen readers to help people work many jobs, that should be the first importance. Next, intertainment uses need to be accessible with a screen reader. If you work hard, you need to play hard LOL!

NVDA does not have to have every feature that JAWS has either. I am so glad it doesn’t.

It takes me a few seconds to install NVDA, and 15 minutes to install JAWS, and JAWS leaves footprints all over my computer.

David Moore

Sent from Mail for Windows 10


From: Gene New Zealand
Sent: Sunday, December 17, 2017 7:16 PM
Subject: Re: [nvda] Screen Shade/curtain?




I agree with Joseph.


There might be things from other screen readers we might use or might not use so I would rather the developers concentrate on screen reader features that help.


if some one has got the smarts they can do it in a add on and that way if one is made you have the choice of either adding it or not.


then down the track it could be added like you see with some addons that code gets added to the core of nvda.




Gene nz



On 12/18/2017 11:47 AM, Kevin Cussick via Groups.Io wrote:

well fare enough,   but I still think it should be in the core one day in nvda.   if you don't want to use it then fare enough but I feel this is a feature for us blind screen reader users that is needed and would be a good thing for nvda to have built in.

On 17/12/2017 22:06, Joseph Lee wrote:

Some JAWS users did report that it doesn’t work all the time.
As for my justification statement: like some in the community, I believe that NVDA's purpose is screen reading. I think NVDA Core should focus on screen reading, with add-ons coming in with optional features. I do understand that I can be heavy-handed at times like the one pointed out below, but I'm speaking from experience that just following the lead of another screen reader just because NVDA should is something I'm uncomfortable with. Also, privacy is something a shade feature cannot guarantee 100 percent, as there are numerous ways of breaching it, including sounds, speech, remote access, data sharing and many others.

-----Original Message-----
From: [] On Behalf Of Kevin Cussick via Groups.Io
Sent: Sunday, December 17, 2017 1:56 PM
Subject: Re: [nvda] Screen Shade/curtain?

it does not work on my 2 all in ones and I tried a little program on my laptops that should do this but it didn't work. I think it should be in nvda and Joseph for you just to say that you won't consider it if people say other screen readers have it is very heavy handed.

On 17/12/2017 21:24, Joseph Lee wrote:

Sure, turning off the monitor may work, but not always.

-----Original Message-----
From: [] On Behalf Of
Didier Colle
Sent: Sunday, December 17, 2017 1:21 PM
Subject: Re: [nvda] Screen Shade/curtain?

Hi Joseeph,

Thanks for the clarification.

Indeed, showing a blank window would not save energy. But why not simply switching off the screen (power button on an external monitor, or using the Fn+F7 (or similar key combination) on a laptop? Then you have both advantages, the pseudo "privacy" thing, and the energy saving.

I agree with the rest.

If an add-on would be needed, then I believe it is more worth
investing in an add-on that can report the status of the screen
(backlight level, to what port/screen the video signal is send), a bit
like the battery level feature in NVDA (nvda+shift+b)

Kind Regards,


On 17/12/2017 22:04, Joseph Lee wrote:

As noted by some members, screen shade/curtain shows what appears to be a blank screen. This is used to "guarantee" privacy for screen reader users. Note the quotation marks around "guarantee", as it does not really guarantee privacy, as there are means to circumvent this (speech output, braille displays, remote access, etc.).
   From what I can gather, this function does not result in extended battery life nor power savings. When this function is turned on, an overlay window is imposed on top of other windows, and turning this off removes this overlay. As I said above, this does not provide privacy as many of you may think.
As for this being part of a screen reader: my overall opinion is that it should not. If people want it, then I think an add-on would be a more appropriate solution. Only after looking at justifications and costs should developers consider adding this into NVDA, in my opinion, and personally for me, a justification that goes along the lines of, "because another screen reader has this" is something I won't even consider.

-----Original Message-----
From: [] On Behalf Of
Didier Colle
Sent: Sunday, December 17, 2017 6:37 AM
Subject: Re: [nvda] Screen Shade/curtain?

Hi all,

I am not sure what this functionality is exactly about.

When it is about switching off / dimming the monitor, I do not understand why it would not save on battery....

The backlight of a monitor in a laptop, tablet, smartphone, ... whatever is one of the main power sinks in such systems.

On a laptop, you can often (this may vary between laptops) use Fn+f7
for switching between different display modes (signal send only to
laptop monitor, signal send to external monitor only or signal send
both) or
Fn+F5 to dim the backlight and Fn+F6 to light it up.When I am on
power for a long time, I dim the backlight with Fn+f5 to save battery.

Thus you don't need a NVDA add-on for that, although such add-on may
be useful to read the status of the screen (to which monitor is the
signal send, on what level is the backlight). I have no clue whether
windows has access to such info, let alone it provides an api to
request that info (it might be the case that on some laptops this is
a pure BIOS feature completely transparent to windows).

Once again, I am not sure what this functionality is supposed to be
exactly, and thus I may be speaking about something completely different.

Kind regards,


On 17/12/2017 9:24, Brian's Mail list account via Groups.Io wrote:

   From what I know about Windows and indeed most screenreaders, this
function is just for privacy, ie its not going to save any battery.
If that is what you want then I'd have thought it was possible to do
it, kind of like a screensaver that never actually loses focus but
then you need to be able to tell nvda that you want it to use the
invisible window not the visible one.

In the  issues tracker there is a thread on this.
Also the ultimate way |of doing this on a desktop is called the
monitor off switch..... ahem.


Sent via blueyonder.
Please address personal email to:-
briang1@..., putting 'Brian Gaff'
in the display name field.
----- Original Message ----- From: "Kevin Chao"
To: <>
Sent: Saturday, December 16, 2017 11:30 PM
Subject: [nvda] Screen Shade/curtain?


VoiceOver has had screen curtain feature for a long while and JAWS
recently got screen shade.

Does NVDA have a similar feature via an add-on or natively?





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