No ‘halo’ effect in Samsung OLED displays, says UL

1 min read

Samsung’s OLED display for laptops has been certified as ‘halo-free’ by the global certification company UL, the Korean tech giant announced.

The latest certification for Samsung OLED comes after the technology was certified as eye-friendly by TUV and SGS last month. 

The 'halo' effect is a problem in display technology and is the result of 'light blurring,' which occurs when the outline of a bright subject appears white on an image with sharp contrast.

The problem is frequent with LCD displays, whose backlighting can lead to ‘light leakage,’ where backlight appears in areas where both bright and dark colors are expressed. These light leakages result in the 'halo' phenomenon, which causes bright subjects to be blurred.

According to Samsung Display – an offshoot of Samsung Electronics – OLED technology is less prone to this problem because the pixels in the display are self-luminous, meaning there is no need for backlighting.

To prove the efficacy of its OLED technology Samsung Display conducted internal evaluations on 'light blurring degree (halation).'

It found that the OLED showed a halation of 0.00 percent and no indication of light blurring. By contrast, LCDs with 'local dimming' showed noticeable light blurring when tested, the company said.

"Self-luminous OLEDs have independent pixels that light up within the image display area but turn off within other areas, which eliminates blurred lights," said Hojung Lee, Samsung Display's head of product planning team for small and medium-sized display division. "Light blurring is often more noticeable as screen size increases, however OLEDs offer the best viewing solution for large-screen IT devices such as laptops and tablets."