LG Display said on the 26th that the luminance (screen brightness) retention rate of its large organic light-emitting diode (OLED) panels used in TVs and monitors reached 100%.
LG Display received a "performance excellence verification" from the global certification company UL Solutions, certifying that the luminance (screen brightness) retention rate of all its large OLED panel products is 100%.
Luminance retention rate is a metric that evaluates, as a percentage, how well content can be reproduced based on a display's brightness. The test reference area is set, centered at the exact middle of the screen, to ▲10% (1/10) ▲1.1% (11/1000) ▲0.5% (5/1000) ▲0.2% (2/1000) of the full screen, and luminance for these areas is measured and expressed as a percentage indicating whether each luminance value remains unchanged. For a 55-inch TV, the test reference area is reduced in stages and measured to the size of a 17-inch laptop screen (38x22 cm), a smartphone (13x7 cm), a business card (8x4 cm), and two joints of a thumb (5x3 cm).
If the maximum and minimum values measured for screen brightness remain identical without change, the luminance retention rate is 100%. Conversely, the lower the value, the more it indicates that the intensity of light varies by position even within the same screen.
LG Display's OLED panels were assessed to maintain brightness performance even as the test reference area decreased. In contrast, liquid crystal display (LCD) panels darkened as the test reference area decreased, dropping to as low as 43% and at most 83%.
LG Display's new large OLED TV panel applies its proprietary "Primary RGB Tandem 2.0" technology, which emits light by stacking the three primary colors of light (red, green, blue) as separate, independent layers. While achieving a peak brightness of 4,500 nits (nit; 1 nit is the brightness of a single candle), it also incorporates technology that absorbs and diffuses light rather than reflecting it, achieving a low reflectance of 0.3%.
Lee Hyun-woo, head of the large display business unit at LG Display, said, "We have objectively identified why OLED appears brighter and clearer," and added, "Through objective verification, we can now explain more clearly to customers that OLED's pixel dimming technology, which maintains a 100% luminance retention rate, is the best choice in the AI era."