Can you run a 4k laptop in regular HD mode to save battery?

Can you run a 4k laptop in regular HD mode to save battery?  

From what I understand, the Yoga 920:
   15 hours battery with the FHD (1920x1080),
   10 hours battery with the UHD (3840x2160)

I'd prefer longer battery life so I'd like the lower-resolution model.  However, if I could get the better screen and run it at 1920x1080 to save battery, I'd consider that.

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Dr. KlahnConnect With a Mentor Principal Software EngineerCommented:
You'd think that should be the case at first glance, but it turns out to not work that way.  In this case the 3840x2160 display has 4x the number of pixels as the 1920x1080.  Since the screens are the same size, where's the extra power going?  Some of that extra power is going to the driver circuitry that supports the extra pixels, and some is used up by the fact that 4x the number of pixels are being switched.  Cutting resolution to save power doesn't work because the physical screen still has the same number of pixels, the same driver circuitry, and all the pixels must be lit to have normal brightness - even though the virtual screen may be at a much lower resolution.
RaminTechnical AdvisorCommented:
UHD Display need more power than FHD Display. I.m talking about Yoga 920 laptop which came out with Intel® UHD Graphics 620.
you have two options, with UHD Display / FHD Display. UHD also is more expensive and both use the same Hardware and Graphic (Intel® UHD Graphics 620).
JohnConnect With a Mentor Business Consultant (Owner)Commented:
Yes and in addition to the above, Lenovo designs their laptops to work as manufactured so you should get the rated battery life with the display you have
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RaminConnect With a Mentor Technical AdvisorCommented:
Edit: So if you choose UHD Display you will have less battery life regardless of the resolution you select.
mike2401Author Commented:
Thanks everyone !!!!  Great info!!!
JohnBusiness Consultant (Owner)Commented:
You are very welcome - happy to help.
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