Blue light hazard and OLED displays

TCL announced that it is developing a new NXTPAPER eye-care display technology, base don AMOLED displays. TCL has launched the first NXTPAPER display back in 2020, based on reflective LCD panels. 

With its NXTPAPER display, TCL is aiming to bridge the gap between true ePaper (E Ink) displays, and regular displays, by providing display that offer a blue-light free emission, no flicker, high power efficiency, and a paper-like display quality.

LG Display announced today that its entire lineup of OLED panels for TVs and monitors have earned UL Solutions Eyesafe Verification, meeting Eyesafe® Display Requirements 3.0. LG Display says that it is the first in the industry to get this verification.

The new requirements were developed by Eyesafe, an international authority in blue light management, in collaboration with leading eye care professionals. The verification confirms that displays maintain color accuracy and reduce blue light emissions.

LG Display announced that its entire lineup of OLED TV and monitor panels, from 27 to 97 inches (all of its WOLED panels), have become the world’s first displays to receive Eyesafe Circadian Certification. LG Display’s OLED TV and monitor panels achieved the highest circadian certification rating (CPF 50).

EyeSafe, a US-based company specializing in blue light mitigation solutions, says that LG's OLED panels are promoting eye health and better sleep, as the emit just 36% blue light, the lowest in the industry.

Seoul's Kookmin University researchers concluded a clinical study to verify the impact of TV panels of sleep, measuring the levels of the sleep-inducing hormone melatonin in 40 adult men and women divided into groups watching the same content on either LCD or LG's WOLED TVs.

The researcher found that melatonin secretion fell 2.7% over two hours for the LCD group and it increased 8.1% in the OLED TV group. Melatonin rises in the evening to prepare the body for sleep, but the blue light emitted from displays disturbs the melatonin secretion as it confuses the body. As LCDs emit about twice as much blue light as OLEDs, it is not a surprise they have this effect on melatonin levels.

LG Display announced that its third-generation WOLED META TV panels have earned UL Solutions' Platinum eye safety rating and the UL Mark for low blue light. LGD's panels earned a score of 36%, the lowest among all existing TV panels (conventional LCDs range from 70-80%, and lower scores are better). 

This year, UL Solutions has implemented more stringent criteria for measuring blue light emissions in an effort to give consumers more reliable information, with program ratings now classified as Platinum, Gold, Silver, and Bronze. The top rating, Platinum, is awarded to display products with blue light wavelength emissions that sit below 40% of the total blue light wavelength emissions.

During iMID 2023, Universal Display discussed the company's RGBB display architecture, highlighting the advantages regarding color gamut and color reproduction.The RGBB architecture basically adds a fourth OLED subpixel, a light-blue (or cyan) one to a standard RGB deep-color stack.

The current approach to achieve a large color gamut (UDC targets BT.2020) is to use emitters with a narrow spectrum, which enables high color gamut. But there's a catch - each person has a different color perception, and some people are less sensitive to certain colors compared to the "average observer". This causes a display that is based on narrow-spectrum emitters to suffer from distorted perceived colors.

Independent testing and certification leader TÜV Rheinland has awarded LG's OLED TV and monitor panels with its 'Circadian Friendly' certification. LG's OLEDs are the first displays to ever receive this award. 

TÜV Rheinland new 'Circadian Friendly' certification is given to products that meet the standards of minimizing their impact on people's quality of life during the day and promote better sleep at night. These products undergo rigorous testing based on the 'Circadian Stimulus' metric, designed by the Rensselaer Polytechnic Institute's Lighting Research Center.

Samsung has demonstrated new AMOLED display panels that offer a lower blue-light emission compared to its current low-blue-light AMOLEDs. Samsung says that the new display reduces blue light emission by 70% compared to 'conventional' displays (which probably means LCD displays, not standard AMOLEDs).

Samsung brands these new displays as Gen-2 LBL (low-blue-light) AMOLEDs, and says that the lower blue light emission was achieved by a combination of the latest OLED emitter materials and advanced AI software. Samsung is mostly targeting laptop displays, saying that the new Gen-2 LBL displays can achieve a brightness of up to 2,000 nits. Samsung will start producing Gen-2 LBL AMOLEDs by the end of 2023.

Blue light management expert Eyesafe, together with LG Display, published a white paper that examines the major display technologies for television, including LCD and OLED, and their potential influence on eye health and circadian rhythm. Exposure to blue light affects sleep cycles by suppressing levels of melatonin in the brain.

One of the benefits of OLED TV is its naturally low blue light emissions as compared to those of traditional LCD TVs on the market. "Even while maintaining perfect black and high contrast characteristics with excellent picture quality, OLED provides the user with better eye comfort and viewing experience".

Taiwan's National Tsing-Hua University (NTHU) Professor Jou and Dr. Wen have been developing OLED lighting technologies for many years, focusing on healthy bluelight-free OLEDs (so-called candle-light OLEDs) due to the hazards of modern lighting.

The researchers now report they have developed a new tandem-OLED device that improves the efficiency and lifetime of their candle-light OLEDs. The OLED's emission is totally blue-light free, which makes it even safer compared to NTHU's first-gen candle-light OLEDs.