I don't see anything there?
I can't take a picture of my Thunderbolt since the only camera I have is my Thunderbolt at the moment, but the locations of the circles would indicate that the complaint involves bits of brighter-than-average screen located where the LED light sources are placed. Some people call this "stage lighting effect". There are cone-shaped areas where the screen is brighter than the rest of the screen, originating from the LEDs that backlight the screen.
You'll see this on pretty much ANY LED-backlit screen unless the LEDs are located behind the panel, and on a phone that's just not possible.
The problem is that most phone screens are actually SIDE-lit and not backlit, per se. And the problem with LED is that, while it's terribly efficient, it's also a point-light source (unlike fluorescent, which is one of the other major backlight sources on desktop screens). When you have light coming from a series of small points, it's terribly hard to make the screen backlight completely consistent in terms of brightness without using a LOT of small LEDs or having a good amount of space behind the screen to reflect the light around and dissipate the light properly.
Compare the Nexus 4 to something like my Thunderbolt, though, and the Nexus 4 would win hands-down. If you look at my Thunderbolt edge-on, you can actually directly see a small portion of each LED, and it's very bright. At 100% brightness on a black screen in a darkened room, you can plainly see the light emanating from the LEDs.
Similar complaints came up with the Nexus 7. Thing is, though, this behavior exists in any LED-backlight shallow screen. It's the nature of the beast. You get great battery life out of LEDs, but they aren't the ideal light source cosmetically.
Under normal usage where you are keeping the screen lit appropriately for the environment, something like this is simply not going to be visible unless the build quality is really, REALLY poor.