4.3: Lifetime- and Power-Enhanced RGBW Displays Based on White OLEDs

Abstract— Lifetime issues have been a hot topic throughout the history of OLEDs. The rapid development of lifetimes since 2002 has enabled OLED displays to become acceptable for mobile phones. The lifetime requirements of 30,000 hours expressed by the representatives of mobile‐phone‐terminal makers were felt to be unrealistic to be obtained in 2003, since the lifetime of the blue color was below 1000 hours. Today, 5 years later, lifetimes of AMOLED panels are over 50,000 hours. OLED displays are suffering from a burn‐in effect due to limited lifetime. After 2003, it was understood by the panel and terminal makers that instead of lifetime, burn‐in sensitivity became the limiting factor from an AMOLED‐panel usability point of view. The burn‐in effect becomes visible at 2–3% luminance degradation levels between adjacent pixels. To take this effect into account in mobile‐phone applications, the lifetime needs to be increased from 30,000 to 60,000 hours, and suitable algorithms need to be used for the display of the terminal. There is also pressure to double the peak luminance values used in the terminals in order to improve the performance of the screen in outdoor environments. The roles of the material developers, panel makers, and terminal makers are reviewed in this paper from a lifetime perspective.

Section: Discussionmentioning

confidence: 99%

OLED lifetime issues from a mobile‐phone‐industry point of view

Lääperi¹

2008

“…OLED displays with separate OLED layers for red, green, and blue subpixels using a fine metal mask show lower power consumption than the ones with WOLED when they display saturated colors, but it is not the case of non‐saturated colors. It is well known that most image data contain a large amount of white components, and the average panel power consumption can be drastically reduced by using the white subpixel as much as possible . The total power consumption thus primarily depends on the white subpixels.…”

Section: White Organic Light‐emitting Diode Structurementioning

confidence: 99%

“…It is well known that most image data contain a large amount of white components, and the average panel power consumption can be drastically reduced by using the white subpixel as much as possible. [6][7][8] The total power consumption thus primarily depends on the white subpixels. Figure 4 explains subpixel usages according to color coordinates to be displayed.…”

Section: Introductionmentioning

confidence: 99%

Advanced compensation technologies for large‐sized UHD OLED TVs

Takasugi¹,

Shin²,

Chang³

et al. 2016

“…If the optical structure of the device is the same, any W-EML layer can be considered to be used in the three-mode-microcavity WOLED device. [4][5][6][7][8][9][10][11] Figure 4 shows the external light-emitting spectrum of TE WOLED with an OPCL. The spectrum of the TE WOLED with an OPCL was much narrower and well-separated than that of a conventional TE WOLED.…”

Section: Wide-color Gamut Of the Top-emission Woledmentioning

confidence: 99%

A 3.0‐in. 308‐ppi WVGA AMOLED with a top‐emission white OLED and color filter

Kim¹,

Lee²,

Kim³

et al. 2009

Abstract— A 3.0‐in. 308‐ppi WVGA top‐emission AMOLED display with a white OLED and color filters, driven by LTPS TFTs demonstrating a color gamut of >90% and a Δ(u′,v′) of <0.02 is reported. A white‐emission source with a unique device structure was developed using all fluorescent materials and yielded efficiencies of 8.45% and 16 cd/A at 4000 nits with CIE color coordinates of (0.30, 0.32).