Backlight bleed often ocurrs around the edges or in the corners of an LCD display. It can be caused by dust overtightning of screws etc. This is a fault.
The grey around the rose in your picture is also bleed and inherent due to the nature of how an LCD display works and their inibilty to turn off unwanted pixels to produce a a pure black background and pur colour of the image, which makes them look washed out/hazey. Its often seen in lower end TV’s that feature global dimming. Some are better than others.
A Tv with local dimming mitigates this a little bit better. A Full Array Local Dimming TV has a full array backlight and far more local dimming zones made up of a smaller group of pixels. In a mini LED TV there can be many more in the 100’s of smaller local dimming zones that can produce crisper images closer to that of an OLED.
Blooming is also a characheristic of a LCD TV which is caused by light from isolated bright objects on the screen, that bleeds into darker areas surrounding it causing a Halo effect.
Theres more to consider when buying LCD and the old saying you get what you pay for is to a certain extent true when buying. This time of year and in the coming weeks is the best time to buy because you can get a higher end TV that has been reduced, which would otherwise be way beyond your budget.
OLEDs are capable illuminating each individual pixel as needed, and can just turn pixels when mot needed. Thats why they produce the blackest black, and crisper images as they reach 99% or more of the colour garmut. There is no blooming, backlight bleed or motion problems due to their design. In many ways they are the simplist TV to buy but are pricey to start with.
The new style OLEDs starting to launch this year will see the brightness of a mini LED and the picture quality of OLED. This is where Samsung is putting its money (see my write up a couple of days ago) TCL, LG Sont etc etc are also going this route. LG has the greatest range of OLEDs ranging from the A series to the glallery and signature series s not all of their range will follow yhis route. These TV’s are in there thousands to buy!