80 Zones on the LG 55LH90

This is my test of the LG 55LH90 to count the number of local-dimming zones the LCD has. There are 80 arranged 8 high and 10 wide and you can count them too. The camera is set up way off axis so you can see the backlight blooming in the diffuser. As I move the block around the screen note the larger fuzzy area that lights up, as the block crosses to a different zone you'll see two zones light up at once then the other zone turn off as the block leaves. When the block gets to the top of the screen you'll see it get pretty dim, this is because the zone dims as most the block has left the screen.

Category:

Science & Technology

Tags:

• local dimming
• LG 55LH90

[kametani234]

Nice video showing how the local-dimming works. I am wondering if we can see such a blooming when we face the screen on axis.

[CapnBry]

@kametani234 it is extremely difficult to see when viewing on axis, even in a dark room with the same test case. This video was shot way off to the side, probably close to 75 degrees from center which exploits the cross section thickness of the diffuser to be able to see it.

Off-angle viewing even for live content gives everything light a milky appearance for the same reason. That starts appearing between 50-60 degrees off center.

Straight-on viewing it is very hard to distinguish.

[CapnBry]

@iRon2013 it is an OpenGL test program I created specifically for this test. I just looked around and it looks like I have since deleted it. All it did was create a fullscreen black window then put a white square where the mouse is. The square could be made smaller or larger. There might be something similar, but I don't have the test app any more.