Re: Screen Shade/curtain?


I don't understand, why not have this be a part of NVDA. I could
careless about another screen reader having this feature. I just know
it's useful. Also my battery does last a bit longer when my screen is
at 0 percent. I tend to black my screen because I really don't wish to
always share what I am viewing with others.

On 12/17/17, ely.r@... <ely.r@...> wrote:
I agree. I also use JAWS an monitor the list. There have been many postings
about the Screen Shade not working. This means that lots of developer time
at VFO is being given over to this issue.

Most importantly I want a screen reader to be its best at reading me the
screen. Sometimes it is easy to fall into wishing that our screen reader
could do all the things we know that sighted people are doing with their
computers. OCR can be another of those diverting paths. There are good tools
available for providing Optical Character Recognition, but that feature
doesn't need to be part of a screen reader. With all the issues regarding
browsers, I would rather see development efforts aimed at assuring us
quality access to the internet.
The NVDA project is simply an amazing effort. It is making access to the
screen available to everyone. Yes, we have to purchase high quality
alternative synthesizers if we want or, in my case where hearing is also an
issue, need them. NVDA could include those, but then they would have to pay
for those rights or develop their own. The same would be the case for an OCR

As to a screen shade, is it possible that there is a free or low cost app
already out there that might serve? This group is amazingly active. Might we
take on researching the screen shade issue to see what we can find that
works and then letting all of us know? Let's join the folks, many of them
volunteers, who are working to create and advance NVDA
Apologies for the rant,

-----Original Message-----
From: [] On Behalf Of Joseph
Sent: Sunday, December 17, 2017 5:07 PM
Subject: Re: [nvda] Screen Shade/curtain?

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

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?

Lenron Brown
Cell: 985-271-2832
Skype: ron.brown762

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