Topics

screen curtains


Don H
 

I could be wrong but I don't think screen curtains save anything on battery life.

On 2/12/2019 6:34 PM, molly the blind tech lover wrote:
lol
-----Original Message-----
From: nvda@nvda.groups.io <nvda@nvda.groups.io> On Behalf Of Chris Shook
Sent: Tuesday, February 12, 2019 7:24 PM
To: nvda@nvda.groups.io
Subject: Re: [nvda] NVDA and tablets
Molly,
My and your posts describing the screen curtain were scarily similar.


Quentin Christensen
 

Don, you are correct.  The way screen curtain (in any AT) works presently, is that it overrides whatever gets sent to the screen with black pixels.  Because of that, it may actually save a little battery life (vs displaying white pixels at full brightness), I'm not sure - but in order to save battery life what you would really need is to turn the screen off altogether.  Some versions of Windows let you use either WINDOWS+P, or your laptop's command to display on a second screen only - and if you don't have one attached that's like turning the screen off, but some are too "clever" and realise you don't have a second screen so disable it.

The primary reason for using screen curtain therefore is privacy.


On Wed, Feb 13, 2019 at 11:36 AM Don H <lmddh50@...> wrote:
I could be wrong but I don't think screen curtains save anything on
battery life.

On 2/12/2019 6:34 PM, molly the blind tech lover wrote:
> lol
>
> -----Original Message-----
> From: nvda@nvda.groups.io <nvda@nvda.groups.io> On Behalf Of Chris Shook
> Sent: Tuesday, February 12, 2019 7:24 PM
> To: nvda@nvda.groups.io
> Subject: Re: [nvda] NVDA and tablets
>
> Molly,
> My and your posts describing the screen curtain were scarily similar.
>
>
>
>
>
>
>
>
>






--
Quentin Christensen
Training and Support Manager

Official NVDA Training modules and expert certification now available: http://www.nvaccess.org/shop/

Facebook: http://www.facebook.com/NVAccess 
Twitter: @NVAccess 


 

On Tue, Feb 12, 2019 at 08:26 PM, Quentin Christensen wrote:
The way screen curtain (in any AT) works presently, is that it overrides whatever gets sent to the screen with black pixels. 
This is in direct contravention to my own anecdotal observations with every smartphone and tablet user who has screen curtains turned on.

And I've been around a lot of them.  It is possible to drive the touch part of a touch-enabled device with all the rest of the screen powered off, and since there is no backlighting or other illumination of any sort present when screen curtain is on in Android or iOS I very much doubt the screen itself is on and being written over.
 
--

Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

          ~ Saul Bellow, To Jerusalem and Back

 

 


Don H
 

On my win 10 laptop using Jaws 2019 and its screen curtain feature you can still the screen is on just not readable.

On 2/12/2019 7:36 PM, Brian Vogel wrote:
On Tue, Feb 12, 2019 at 08:26 PM, Quentin Christensen wrote:
The way screen curtain (in any AT) works presently, is that it
overrides whatever gets sent to the screen with black pixels. This is in direct contravention to my own anecdotal observations with every smartphone and tablet user who has screen curtains turned on.
And I've been around a lot of them.  It is possible to drive the touch part of a touch-enabled device with all the rest of the screen powered off, and since there is no backlighting or other illumination of any sort present when screen curtain is on in Android or iOS I very much doubt the screen itself is on and being written over.
--
Brian *-*Windows 10 Home, 64-Bit, Version 1809, Build 17763
*/A great deal of intelligence can be invested in ignorance when the need for illusion is deep./*
          ~ Saul Bellow, /To Jerusalem and Back/


molly the blind tech lover
 

Speaking of screen curtain it’s cool and all butt when I turned it on, NVDA like froze or something.

,

From: nvda@nvda.groups.io <nvda@nvda.groups.io> On Behalf Of Brian Vogel
Sent: Tuesday, February 12, 2019 8:37 PM
To: nvda@nvda.groups.io
Subject: Re: [nvda] screen curtains

 

On Tue, Feb 12, 2019 at 08:26 PM, Quentin Christensen wrote:

The way screen curtain (in any AT) works presently, is that it overrides whatever gets sent to the screen with black pixels. 

This is in direct contravention to my own anecdotal observations with every smartphone and tablet user who has screen curtains turned on.

And I've been around a lot of them.  It is possible to drive the touch part of a touch-enabled device with all the rest of the screen powered off, and since there is no backlighting or other illumination of any sort present when screen curtain is on in Android or iOS I very much doubt the screen itself is on and being written over.
 
--

Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

          ~ Saul Bellow, To Jerusalem and Back

 

 


 

Don, no argument there.  

My comments apply only to handheld and tablet devices I've dealt with.  On computers, particularly laptops, you can most often see that the backlighting is still on, and the screen black, which suggests Quentin's proposition is indeed what's going on there.
 
--

Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

          ~ Saul Bellow, To Jerusalem and Back

 

 


Quentin Christensen
 

It is likely that mobile operating systems have a way to turn the screen off while leaving touch enabled - it could be done on Windows, but it would need to be something Microsoft built in, it can't be something we can bolt-on after the fact - If Microsoft built such a feature in, we could tap into it.


On Wed, Feb 13, 2019 at 12:36 PM Brian Vogel <britechguy@...> wrote:
On Tue, Feb 12, 2019 at 08:26 PM, Quentin Christensen wrote:
The way screen curtain (in any AT) works presently, is that it overrides whatever gets sent to the screen with black pixels. 
This is in direct contravention to my own anecdotal observations with every smartphone and tablet user who has screen curtains turned on.

And I've been around a lot of them.  It is possible to drive the touch part of a touch-enabled device with all the rest of the screen powered off, and since there is no backlighting or other illumination of any sort present when screen curtain is on in Android or iOS I very much doubt the screen itself is on and being written over.
 
--

Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

          ~ Saul Bellow, To Jerusalem and Back

 

 



--
Quentin Christensen
Training and Support Manager

Official NVDA Training modules and expert certification now available: http://www.nvaccess.org/shop/

Facebook: http://www.facebook.com/NVAccess 
Twitter: @NVAccess 


Don H
 

Yep just tried the screen curtain addon for NVDA and you can definitely still see the glow of the screen which tells me that not much power saving is accomplished. Just a nice way to avoid wondering eyes.


Chris Shook <chris0309@...>
 

In IOS screen curtain is connected to voice over and only stays off so long as VoiceOver is on.


Chris Shook <chris0309@...>
 

Uh-o.
Were you able to get it unstuck?


molly the blind tech lover
 

In Android you double click the power button while TalkBack is running. It's
stays running as long as TalkBack is running.

-----Original Message-----
From: nvda@nvda.groups.io <nvda@nvda.groups.io> On Behalf Of Chris Shook
Sent: Tuesday, February 12, 2019 9:08 PM
To: nvda@nvda.groups.io
Subject: Re: [nvda] screen curtains

In IOS screen curtain is connected to voice over and only stays off so long
as VoiceOver is on.


molly the blind tech lover
 

Um. Uh. Yeah... We should end this thread I don't want to upset anyone 😨

-----Original Message-----
From: nvda@nvda.groups.io <nvda@nvda.groups.io> On Behalf Of Chris Shook
Sent: Tuesday, February 12, 2019 9:15 PM
To: nvda@nvda.groups.io
Subject: Re: [nvda] screen curtains

Uh-o.
Were you able to get it unstuck?


Laurie Mehta
 

I'm not sure if this is relevant to a pc screen but on an iPhone, if screen curtain is on, there is still a slight glow to the phone's screen even though the effect is a blackened screen. You can check this (if you have some sight) by putting screen curtain on the phone while in a totally dark room.

I use a MacBook-Air with BootCamp to use Windows. This laptop has a feature that allows one to adjust the keyboard brightness as well as adjust the screen brightness. I work with keyboard backlighting and screen lighting turned down to zero and I find that the laptop battery lasts much longer that way than it does if either the keyboard or screen is lighted.

I do not know if regular laptops have a button for adjusting screen and keyboard brightness.
--------------------------------------------

On Tue, 2/12/19, Brian Vogel <@britechguy> wrote:

Subject: Re: [nvda] screen curtains
To: nvda@nvda.groups.io
Date: Tuesday, February 12, 2019, 5:36 PM

On Tue, Feb 12, 2019 at
08:26 PM, Quentin Christensen wrote:

The way screen curtain (in any AT) works
presently, is that it overrides whatever gets sent to the
screen with black pixels. 
This is in direct contravention to my own anecdotal
observations with every smartphone and tablet user who has
screen curtains turned on.

And I've been around a lot of them.  It is
possible to drive the touch part of a touch-enabled device
with all the rest of the screen powered off, and since there
is no backlighting or other illumination of any sort present
when screen curtain is on in Android or iOS I very much
doubt the screen itself is on and being written over.
 
--

Brian - Windows 10 Home, 64-Bit, Version 1809, Build
17763  
A great deal of intelligence can be
invested in ignorance when the need for illusion is
deep.
          ~ Saul
Bellow, To Jerusalem and Back


Sarah k Alawami
 

Actually now you I think press the volume keys 3 times to turn and off screen curtain if you have that option set in talkback. But no, the add on for NVDA does not save much battery, if you want to do that I guess lower yoru brightness through the control panel or through fn keys?

Take care

On 12 Feb 2019, at 18:16, molly the blind tech lover wrote:

In Android you double click the power button while TalkBack is running. It's
stays running as long as TalkBack is running.


Travis Siegel <tsiegel@...>
 

the screen saver option on the apple Iphone certainly does save battery.  I can run my phone nearly all day when I have the screen turned off, where as it's only about 10-12 hours when it's not, so, yes, it definitely helps in some cases.  Also, sometimes (though I can't figure out how) my computer does act like the screen is turned off.  I think it's a bug in windows, but if I could figure out how to exploit it for making it a feature, I'd sure do so.


Brian's Mail list account <bglists@...>
 

I've only seen a few later posts. That probably means that they are in the spam bin again.
Brian

bglists@...
Sent via blueyonder.
Please address personal E-mail to:-
briang1@..., putting 'Brian Gaff'
in the display name field.

----- Original Message -----
From: "molly the blind tech lover" <brainardmolly@...>
To: <nvda@nvda.groups.io>
Sent: Wednesday, February 13, 2019 2:22 AM
Subject: Re: [nvda] screen curtains


Um. Uh. Yeah... We should end this thread I don't want to upset anyone 😨

-----Original Message-----
From: nvda@nvda.groups.io <nvda@nvda.groups.io> On Behalf Of Chris Shook
Sent: Tuesday, February 12, 2019 9:15 PM
To: nvda@nvda.groups.io
Subject: Re: [nvda] screen curtains

Uh-o.
Were you able to get it unstuck?


Kevin Cussick
 

no it doesn't but turning the screen all the way down does.

On 13/02/2019 00:35, Don H wrote:
I could be wrong but I don't think screen curtains save anything on battery life.
On 2/12/2019 6:34 PM, molly the blind tech lover wrote:
lol

-----Original Message-----
From: nvda@nvda.groups.io <nvda@nvda.groups.io> On Behalf Of Chris Shook
Sent: Tuesday, February 12, 2019 7:24 PM
To: nvda@nvda.groups.io
Subject: Re: [nvda] NVDA and tablets

Molly,
My and your posts describing the screen curtain were scarily similar.