It is correct. this is because on LCD screens, the same amount of
energy is used to project black on the screen as white or other
colors. The display elements are not turned off but just turned to
black. On OLED screens such as with the iPhone X, a black screen
turnes off the diodes.

Kelly

On 1/21/18, Mr. Ed <pink...@abe.midco.net> wrote:
> Hi All,
>
> I know this has been discuss way back when. To my recollection I remember
> it
> being said that having the screen curtain turned on does not save battery
> power. Can anyone share any information on this as to whether this is
> correct or not.
>
> Mr. Ed
>
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