Burn in and Image Retention - Page 3

HDTVTest posted an interesting interview with Cadmium-Free QD developer Nanosys CEO and president Jason Hartlove. In this long interview Jason discusses the company's technology and recent achievements.

Jason reveals that the company is working on emissive Quantum Dots displays - and he expects to have a full-color monitor-size QLED display prototype ready by the end of 2019. Jason says that they hope to show these display prototypes in private demos at CES 2020.

Review web site Rtings.com has performed an extensive burn-in trial for LG's 2017 OLEDC7 OLED TV models, and reports that the TVs have shown signs of permanent image-retention, or burn-in after only 4,000 hours.

Rtings have used six OLED TVs, running them from January 2018 for 5 hours each day at a time followed by one hour when the TVs are turned off. This cycle was run 4 times a day. One TV was at maximum brightness, and the rest at only 200 nits. Some played CNN, some a gaming title (FIFA 2018) and some of the TVs played regular TV channels. The TV that played CNN had a clear logo and static bar burn-in images, and the same goes for the FIFA game (but only slightly). The regular TV programs did not suffer from any burn-in.

Only four months after LG installed 69 OLED TVs at Seoul's Incheon Airport it was reported that the TVs suffer serious permanent image-retention, or burn-in. ZDNet now reports that LG replaced the problematic OLED TVs at the airport's Korean Air Miler Club Lounge with LCDs.

The report suggests that LG was not sure it could solve the burn-in issues with this particular display, and so opted for an LCD. LG denies that burn-in is a serious issues and says the TVs's lifetime are over 30,000 hours.

According to a ZDNet report, the LG OLED TVs at Incheon Airport, installed only a few months ago, suffer from serious permanent image-retention, or burn-in. You can see the artifact at the top part of the TV in the photo below:

According to ZDNet, LG installed 29 such OLED TVs at the airport lobby in addition to 40 more units at four of the airport's lounges. These were installed in January 2018, only four months ago. LG Electronics did not comment on this story.

Korea's Cetizen posted an interesting review of the burn-in of 3 flagship OLED phones, the iPhone X, the S7 Edge and the Note 8. Cetizen displayed the same image on all three phones for 510 hours (!) at full brightness.

As you can see in the image above, the Note 8 has very visible burn-in, while the two other phones perform better. Cetizen say that the iPhone has the best display in that regard. Apple did in fact confirm that the iPhone X suffers from burn in, but also said that it engineered the display to be the best in the industry in reducing the effect of OLED burn-in, though - and apparently this engineering works.

Following the launch of LG's pOLED displays, we had many recent discussions and reports of OLED burn-in and Image-Retention. Apple now released a support document for the iPhone X, its first OLED phones, in which it warns users that image persistence or burn-in is an "expected behavior".

Apple says it engineered the display to be the best in the industry in reducing the effect of OLED burn-in, though. Apple also says that its OLED could have noticeable but slight shifts in color and hue when seen off-angle. The iPhone X has a 5.8" 1125x2436 Samsung-made Super AMOLED display.

Google started shipping its Pixel 2 XL smartphone a few weeks ago, and this is one of the first two phones to adopt LG Display's new 6" 1440x2880 (538 PPI) pOLEDs. While on paper these displays are superb, actual reviews were rather dismal - to the point that some reviewers say that these are simply "bad displays".

Both reviewers and customers complain about bad color reproduction, graininess and problematic viewing angles. In addition many users seem to report serious image retention issues. Google has now posted an update regarding the Pixel 2 XL display.

In September 2017 LG Display started shipping its new 6" 1440x2880 (538 PPI) pOLED displays, which are adopted so far by two smartphones - the LG V30 and Google's Pixel 2 XL. On paper these displays are superb, but actual reviews were rather dismal - to the point that some reviewers say that these are simply "bad displays".

The reviews mentioned bad color reproduction, graininess and problematic viewing angles - and many consumers also reported serious burn-in issues. Samsung has recently started a marketing campaign that says that LG OLED TVs also suffer from image retention problems. In this article we'll explain what is burn-in, the difference between burn-in and temporal image-retention and also try to shed some light on LG's latest OLED problems.

Samsung has published a video showing how 12 hours of gaming effects different TV technologies. Samsung compare's it's own Q-LED (quantum-dots enhanced LED LCD TV) with LG's OLED TVs (the 2017 OLEDB7).

The video shows that following the extensive gaming run, Samsung's TV shows no image retention, while some problems are clearly visible on LG's TV.

Image retention ("Burn in") is one of the major drawbacks of OLED displays, and a static icon or very consistent displays are always a problem with such displays. When Samsung introduced the Galaxy S8 it implemented a soft home button, which caused some concerns.

PhoneArena confirm that Samsung's home button actually moves around by a few pixels from time to time - obviously to prevent serious image retention. Samsung employed the same trick with its "always on" clock display in previous OLED phones. This is a good way to improve image retention - although it won't solve the problem completely as the icon only moves around by a few pixels each time.