Scott, Our friend is thinking of conservation of energy. Since light is a form of energy absence of light must be a form of non-energy. So, what happened to that energy? I don't know directly, but I would expect that the actual wattage of the bite the mid it is very minimal compared to the power of the display itself. Sounds like a question one should ask of those ask the expert web ages. No, we already know that most of the energy of the display is consumed the back light. Jonathan Cohn
> On Nov 17, 2016, at 8:44 AM, Scott Granados <[email protected]> wrote: > > My explanation is exactly what you said, you use matrixes of transistors to > move the liquid crystals in to different charged states that filter white > light. > > I’m not going to argue with you because you’re to dense to listen and it’s a > waste of my time but you literally confirmed everything I said in your > response. > > > >> On Nov 17, 2016, at 8:06 AM, Todor Fassl <[email protected]> wrote: >> >> >> You don't actually understand how a screen works, right? >> >> Actually, I googled it and it does make sense. So a touch screen works by >> filtering phosphorescent light. It's likechristmas lights. They are just >> white lights with a colored transparent plastic bulb. The screen aligns >> crystals to filter the light depending on what color each pixel is to >> display. If you align the crystals so they filter all of the light, that's >> black. So actually, the device probably is absorbing that energy and >> radiating it as heat when you turn the screen curtain on. >> >> Your explanation is nonsense but the screen curtain may not save energy. You >> happen to be right but for the wrong reason. >> >> >> >>> On 11/16/2016 09:52 PM, Scott Granados wrote: >>> Of course black requires power, any light omitted regardless of color >>> requires the same amount of power. The color of the pixels doesn’t matter >>> they all generate the same amount regardless of whether it’s white, black >>> or something in-between. Hell, pixels technically don’t even have to omit >>> visible light to draw power if they generated something in the infrared or >>> ultraviolet spectrum. It’s not like CRT displays where black is generated >>> by pulsing off the electron gun.;) >>> >>> A good understanding of how displays work would be a good start. In the >>> case of these screens, basically each pixel or color element consists of a >>> transistor array and elements that are combined to generate a particular >>> set of colors. Some use red, green and blue in combination, others use C Y >>> M and K and all designs use a backlight. You also have designs where the >>> transistor array enables a set of chemicals which can become opaque to >>> certain colors or all colors based on the light filtered so it’s a >>> subtractive system. You start with a white light in the back and you >>> filter out all the color combinations you want to block to leave yourself >>> with the color you wish to display that remains. In this case, you’d >>> activate all the transistors in the array to filter out all colors and be >>> left with the absence of color for that particular element. If the screen >>> curtain is enabled the back light is still generating the same white and >>> the pixel elements are filtering out that white light on all elements being >>> left with the absence of color yet the net energy drain is the same. >>> Whether an additive or subtractive system you will draw power per element >>> to generate a color or in the case of black the absence of color. You also >>> still have the multiplexer / demultiplexer electronics that are carrying >>> the black signal that draw power regardless of the color being generated, >>> the graphics processor is generating a signal with all black elements and >>> so on and so forth. All displays work a little differently whether it’s >>> LCD which tends to be subtractive or LED where you use light emitting >>> components or OLED that uses organic chemistry under electrical stimulus to >>> generate light the concepts are the same. >>> >>> >>>> On Nov 16, 2016, at 10:11 PM, Todor Fassl <[email protected]> wrote: >>>> >>>> No, black does not requirejuice. I have been thinking about this and this >>>> thing about the screen curtain not saving power defies the laws of >>>> physics. When the screen curtain is off, light is emitted from the screen. >>>> Energy is escaping through the screen. If the screen curtain is off, where >>>> does that energy go? Does turning on the screen curtain make the device >>>> disipate more energy as heat or something? I doubt it. >>>> >>>> >>>> >>>> >>>> >>>> >>>>> On 11/16/2016 11:31 AM, Scott Granados wrote: >>>>> David this sounds correct to me as well, black requires juice just like >>>>> all the other colors. Turning down the brightness is the only way to >>>>> save power with the screen. Frankly, I don’t bother, just put the >>>>> brightness in auto mode and let her rip. >>>>> >>>>> >>>>>> On Nov 15, 2016, at 1:00 PM, David Chittenden <[email protected]> >>>>>> wrote: >>>>>> >>>>>> According to Apple, screen curtain has no effect on battery life. Screen >>>>>> curtain sets all the pixels to black. It does not turn the backlight off. >>>>>> >>>>>> Kind regards, >>>>>> >>>>>> David Chittenden, MSc, MRCAA >>>>>> Email: [email protected] >>>>>> Mobile: +64 21 2288 288 >>>>>> Sent from my iPhone >>>>>> >>>>>>> On 16/11/2016, at 06:42, Anders Holmberg <[email protected]> wrote: >>>>>>> >>>>>>> Hi! >>>>>>> Screen curtain does not help saving battery from what i have heard. >>>>>>> But i am not sure. >>>>>>> /A >>>>>>>> 13 nov. 2016 kl. 19:17 skrev Anne Robertson <[email protected]>: >>>>>>>> >>>>>>>> Hello, >>>>>>>> >>>>>>>> The battery drain problem is a known issue and would appear to be >>>>>>>> fixed by the second release of iOS 10.1.1. It has nothing to do with >>>>>>>> using VoiceOver as non-voiceOver users have the same problem. >>>>>>>> >>>>>>>> Cheers, >>>>>>>> >>>>>>>> Anne >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> On 13 Nov 2016, at 17:50, Todor Fassl <[email protected]> wrote: >>>>>>>>> >>>>>>>>> Have you fiddled with the screen brightness? I have the screen >>>>>>>>> bightness on my itouch set to zero and the screen curtain on as well. >>>>>>>>> But some of my friends who are visually impaired turned the >>>>>>>>> brightness up and it drained their battery a lot. >>>>>>>>> >>>>>>>>> >>>>>>>>>> On 11/12/2016 01:27 PM, Andrew Lamanche wrote: >>>>>>>>>> Hi Listers, >>>>>>>>>> >>>>>>>>>> I have a new ipod touch - the latest one - but I'm somewhat puzzled >>>>>>>>>> if not disappointed, that the battery doesn't last on it as long as >>>>>>>>>> it is promised in the advert on Apple's website. I haven't been >>>>>>>>>> using it very much and yet the battery drains quite quickly. In the >>>>>>>>>> last 24 hours i would have used it for about 3 hours and it's >>>>>>>>>> already down to 20% only. Is this normal? Just wanted to know what >>>>>>>>>> your experiences with batter life are, any tips and tricks? I've >>>>>>>>>> switched off "background app refresh", and enabled "reduced motion" >>>>>>>>>> both of which are supposed to improve battery life. I've also >>>>>>>>>> switched of mail fetching so that I do it only manually. >>>>>>>>>> >>>>>>>>>> Andrew >>>>>>>>>> >>>>>>>>> -- >>>>>>>>> The following information is important for all members of the Mac >>>>>>>>> Visionaries list. >>>>>>>>> >>>>>>>>> If you have any questions or concerns about the running of this list, >>>>>>>>> or if you feel that a member's post is inappropriate, please contact >>>>>>>>> the owners or moderators directly rather than posting on the list >>>>>>>>> itself. >>>>>>>>> >>>>>>>>> Your Mac Visionaries list moderator is Mark Taylor. You can reach >>>>>>>>> mark at: [email protected] and your owner is >>>>>>>>> Cara Quinn - you can reach Cara at [email protected] >>>>>>>>> >>>>>>>>> The archives for this list can be searched at: >>>>>>>>> http://www.mail-archive.com/[email protected]/ >>>>>>>>> --- You received this message because you are subscribed to the >>>>>>>>> Google Groups "MacVisionaries" group. >>>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>>> send an email to [email protected]. >>>>>>>>> To post to this group, send email to [email protected]. >>>>>>>>> Visit this group at https://groups.google.com/group/macvisionaries. >>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> -- >>>>>>>> The following information is important for all members of the Mac >>>>>>>> Visionaries list. >>>>>>>> >>>>>>>> If you have any questions or concerns about the running of this list, >>>>>>>> or if you feel that a member's post is inappropriate, please contact >>>>>>>> the owners or moderators directly rather than posting on the list >>>>>>>> itself. >>>>>>>> >>>>>>>> Your Mac Visionaries list moderator is Mark Taylor. You can reach >>>>>>>> mark at: [email protected] and your owner is >>>>>>>> Cara Quinn - you can reach Cara at [email protected] >>>>>>>> >>>>>>>> The archives for this list can be searched at: >>>>>>>> http://www.mail-archive.com/[email protected]/ >>>>>>>> --- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "MacVisionaries" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>>>>> an email to [email protected]. >>>>>>>> To post to this group, send email to [email protected]. >>>>>>>> Visit this group at https://groups.google.com/group/macvisionaries. >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>> -- >>>>>>> The following information is important for all members of the Mac >>>>>>> Visionaries list. >>>>>>> >>>>>>> If you have any questions or concerns about the running of this list, >>>>>>> or if you feel that a member's post is inappropriate, please contact >>>>>>> the owners or moderators directly rather than posting on the list >>>>>>> itself. >>>>>>> >>>>>>> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark >>>>>>> at: [email protected] and your owner is Cara >>>>>>> Quinn - you can reach Cara at [email protected] >>>>>>> >>>>>>> The archives for this list can be searched at: >>>>>>> http://www.mail-archive.com/[email protected]/ >>>>>>> --- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "MacVisionaries" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>>>> an email to [email protected]. >>>>>>> To post to this group, send email to [email protected]. >>>>>>> Visit this group at https://groups.google.com/group/macvisionaries. >>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> -- >>>>>> The following information is important for all members of the Mac >>>>>> Visionaries list. >>>>>> >>>>>> If you have any questions or concerns about the running of this list, or >>>>>> if you feel that a member's post is inappropriate, please contact the >>>>>> owners or moderators directly rather than posting on the list itself. >>>>>> >>>>>> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark >>>>>> at: [email protected] and your owner is Cara >>>>>> Quinn - you can reach Cara at [email protected] >>>>>> >>>>>> The archives for this list can be searched at: >>>>>> http://www.mail-archive.com/[email protected]/ >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "MacVisionaries" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>>> an email to [email protected]. >>>>>> To post to this group, send email to [email protected]. >>>>>> Visit this group at https://groups.google.com/group/macvisionaries. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>> -- >>>> The following information is important for all members of the Mac >>>> Visionaries list. >>>> >>>> If you have any questions or concerns about the running of this list, or >>>> if you feel that a member's post is inappropriate, please contact the >>>> owners or moderators directly rather than posting on the list itself. >>>> >>>> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark >>>> at: [email protected] and your owner is Cara >>>> Quinn - you can reach Cara at [email protected] >>>> >>>> The archives for this list can be searched at: >>>> http://www.mail-archive.com/[email protected]/ >>>> --- You received this message because you are subscribed to the Google >>>> Groups "MacVisionaries" group. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at https://groups.google.com/group/macvisionaries. >>>> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: >> [email protected] and your owner is Cara Quinn - you >> can reach Cara at [email protected] >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/[email protected]/ >> --- You received this message because you are subscribed to the Google >> Groups "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at https://groups.google.com/group/macvisionaries. >> For more options, visit https://groups.google.com/d/optout. > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: > [email protected] and your owner is Cara Quinn - you > can reach Cara at [email protected] > > The archives for this list can be searched at: > http://www.mail-archive.com/[email protected]/ > --- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout. -- The following information is important for all members of the Mac Visionaries list. If you have any questions or concerns about the running of this list, or if you feel that a member's post is inappropriate, please contact the owners or moderators directly rather than posting on the list itself. Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: [email protected] and your owner is Cara Quinn - you can reach Cara at [email protected] The archives for this list can be searched at: http://www.mail-archive.com/[email protected]/ --- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
