New Laptop LCD screen looks "blotchy" with all black background

Hey All,
I have a brand new Lenovo Y700. I noticed that when I boot up the computer and the screen is black for a few seconds, that the black color is not uniform accross the screen but a bit blotchy, particularly in the bottom right corner. I notice this effect changes when I touch the edge of the screen to change the viewing angle. Here's a photo to document what I'm seeing using a black screen youtube video:
https://drive.google.com/file/d/0B3DMDxsayy42cWRtNFJKc1VqNVllZ2gyaEZpcVBNWjg5N0hv/view?usp=sharing

And for comparison a red video captured via my iphone camera--I don't think the camera caught the color the display was getting out, but you can see the inconsistency and I think it's more obvious in the photo than in reality:
https://drive.google.com/file/d/0B3DMDxsayy42a1VEalU0UGpHd3dHeVpCYTVzRkI4bUdINi1F/view?usp=sharing

Finally, here's a photo of what the LCD looks like when viewing this page:
https://drive.google.com/file/d/0B3DMDxsayy42eUJXMkNLS3lZdkRqYzZuX08xSmlDSFVESEU0/view?usp=sharing

I've also noticed a very similar effect on my Samsung LCD TV when a program begins and the screen is black. In both cases, the phenomena I'm talking about is not visible (as far as I can tell) when regularly using the computer.

So some questions. Is this normal? Is there a name for this phenomenon, because I can't seem to find anything about it online? Should I return this computer? Is it defective?

Thanks,
Matt

 

The bright areas on a black screen are caused by backlight bleed. It occurs, to some extent, on many displays and can vary significantly even for the same panel. I have also noticed that cameras tend to exaggerate the problem. The real test for backlight uniformity is how it looks in normal usage. Your third photograph doesn't look too bad - perhaps a little darker in the top left corner.

The Y700 reviewed by notebookcheck had very uniform backlighting so your's must be at the other end of the manufacturing tolerances. If the non-uniform backlighting is evident in everyday usage then you could try to get a replacement.

John

 

Thanks John. Is some level of backlight bleed/clouding/flashlighting inevitable with LCDs? Or should I expect a product free of such defects?

Does touching an LCD with a touch display cause such defects?

 

Most LCD panels have some backlight bleed that can be seen on initial boot but yours looks worse than usual. Getting uniform light distribution from a set of point sources at the edge of the screen isn't easy.

Pressing on a normal LCD can upset the light distribution but touchscreens have the glass layer to provide protection.

John

 

Thanks for your reply. My Laptiop has a touchscreen, but no glass. Although maybe it is glass covered by a matte screen protector. I've heard Lenovo put a film on top of the LCD of this model.

 

I think that is unusual but I don't have hands-on experience with touchscreen computers. Leaving off the protective glass will reduce weight and thickness but makes the LCD more vulnerable to damage. However, this type of pressure damage usually results in a brighter patch on the display in normal use and not be visible as a bright patch when the computer is started.

John