Re: Screen Shade/curtain?

Angela Delicata

Agree: privacy is somehting whic does not really exist now as every good experienced computer user could potentially see everything that's  on your machine.

And do not follow Jaws because it is getting worse  as it contains features which, as you say, do not always work well: this is because from my humble opinion, it is not taken care of as in the past, but the price is still high smile.

Angela from Italy

Il 17/12/2017 23:06, Joseph Lee ha scritto:
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.

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----- 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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