One of the things that LG mentioned during their G2 press event was that the display utilizes Graphic RAM (GRAM), which aids in battery life. What exactly is it? Well first of all, it refers to the Panel Self Refresh (PSR) of the display. With a 60Hz panel, the GPU needs to present the display with the contents of the frame buffer 60 times per second. For fast moving video, this is important. However, when static content such as the home screen or an email is on the display, it’s wasteful. The PSR addresses this.
Interestingly enough, this new optimization isn’t really reducing the display power, it’s actually reducing the System on a Chip (SoC) power. If the display is static, the frame buffer will be copied to a small chunk of memory tied to the display. This is probably around 8MB (1080p @ 32bpp). The Graphics Processing Unit (GPU) is tied to the SoC and will operate at a lower power state since the refreshes will come from the panel’s memory.
According to LG, this lower power state is a 26% reduction in power, but that’s not overall. This would only be during the times when static images are on the display. How much that translates to an entire day of use is the key, which depends on what percentage of the time static images are present on our phones as opposed to moving images. It should be an improvement, but exactly how much? I will leave that to the folks at Anandtech to figure that out.
source: Anandtech
Come comment on this article: LG utilizes Graphic RAM (GRAM) on the G2 smartphone, what on earth is it?
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