Oled televisions offer a superb image but their technology, based on organic diodes, requires careful use. The latter, sensitive to heat, indeed risk a permanent alteration called Bur-in or marking in French in the event of display of a high luminosity for too long. This results in traces of ghost images appearing on the screen, interfering with the vision of the content.
LG Oled TV, sudden screen darkening problem
Oled televisions, here White Oled, are therefore designed to lower the brightness of the screen in multiple situations, in particular if a static image or portion of an image is detected. Among the many algorithms developed over the years by LG Display, the exclusive supplier of White Oled panels to LG but also Panasonic and Sony, there are three better known than others: Auto Static Brightness Limiter or ASBL, Average Picture Level or APL, Global Sticky Reduction or GSR and Temporal Peak Luminance Control or TPC.
Without going into too much detail, the problem of sudden darkening of the screen is mainly related to the APL and/or GSR processes. The first gradually lowers the brightness of the screen if it remains constant over time, the second triggers the principle of extreme precaution, the darkening of the screen when it identifies a static area in the image. And if Sony and Panasonic have largely managed the issue since its 2018 TV range, LG had not yet worked on the subject. Even if some of you, via a special remote control used by repairers and allowing access to the service menu, had circumvented the problem by directly deactivating these parameters (under the constraint of loss of the manufacturer's warranty).
LG Oled TV 2023, the new Firmware ver. 03.10.19 fixed screen dimming problem
Our eminent colleague Vincent Teoh from HDTVtest tells us that it is now done with in some countries, where the Oled 2023 TV series are already available, the availability of a new Firmware numbered ver. 03.10.19 (to see if the TVs marketed soon in France will immediately integrate this latest Firmware or if it will be necessary to update them), LG is finally tackling the situation. Thus, the LG C3 and LG G3 screens will no longer show an untimely drop in brightness with an image, whatever its nature. Except, of course, in the event of a fixed image (pause on a game or a Blu-Ray for example), always with a view to avoiding burning of the diodes. Excellent news, especially when you know that for these LG Oled 2023 TVs, access to the service menu is no longer possible.
One question remains, will this software update be available in the future for previous generations of LG Oled televisions (2022, 2021, 2020…).