Optimum perceived-brightness level considering the practical use environment for the mobile organic light-emitting diode display

In this paper, we delve into reliability characterization for the luminance degradation of OLED device considering color difference index based on the usage patterns. Accelerated aging tests were conducted and then the usage patterns (viewing contents) were taken accounted for the power model to evaluate lifetime. This method enables to provide a practical lifetime prediction on color shifts induced display image degradation at different Gray levels, since different individual components of Red (R), Green (G), and Blue (B) have different degradation rate associated with the usage patterns. Using the color coordinate CIE 1931 ('x, 'y), the just-noticeable difference (JND) index is adopted to quantitatively assess color difference as an objective judgment with a perceivable recognition. Such approach will render a consistent management over color difference and, thus, facilitate product color performance and field reliability.

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“…Table 1. Estimated luminance intensity of R, G, B and W in Comfort Level 2 [9][10]. Note that the number for R, G, B are extracted from Fig.…”

Section: Resultsmentioning

confidence: 99%

“…brightness for each viewing screen varies upon individual preference [9][10]. This concept is similar to auto-brightness mode in mobile phone, meaning that brightness of the screen is automatically adjusted to external ambient conditions.…”

Section: Lifetime Prediction Of Oled Mobile Displaysmentioning

confidence: 99%

83‐2: Reliability Characterization of Luminance Degradation of OLED Mobile Display Considering Color Difference Index Based on Usage Patterns

Kim

Choi

Kim

et al. 2020

Symp Digest of Tech Papers

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“…If the distance becomes shorter, the subject’s field-of-view (FOV) covers only a part of the display area, due to the wide visual angle. A larger distance, such as the 30 cm described in [ 21 ], is feasible and facilitates display fixation but requires a more sophisticated experimental setup for sturdiness. With the chosen setup, the display can be observed directly without requiring a mirror or optical lenses.…”

Section: Methodsmentioning

confidence: 99%

“…Thus luminance levels of visual stimulation devices should be monitored to allow for reproducibility. It must be noted that OLEDs have a lower black luminance compared to LCDs as no backlight is required, thus enabling a higher black-white contrast ratio [ 21 ]. Despite several orders of magnitude in contrast differences Stevens’ psychophysical power law suggests only minor differences in perceived contrast between the two types displays [ 22 ].…”

Section: Display Technologymentioning

confidence: 99%

“…Despite several orders of magnitude in contrast differences Stevens’ psychophysical power law suggests only minor differences in perceived contrast between the two types displays [ 22 ]. In contrast, a similar level of perceived luminance is encountered at physically different luminance levels for LCDs and OLEDs [ 21 ]. Finally, it should be emphasized that luminance depends on the average picture level in OLEDs as power consumption in these devices varies with the number of active diodes and is usually limited by the power supply unit.…”

Section: Display Technologymentioning

confidence: 99%

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MR-compatible, 3.8 inch dual organic light-emitting diode (OLED) in-bore display for functional MRI

Yun

Hong

et al. 2018

PLoS ONE

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PurposeFunctional MRI (fMRI) is a well-established method used to investigate localised brain activation by virtue of the blood oxygen level dependent (BOLD) effect. It often relies on visual presentations using beam projectors, liquid crystal display (LCD) screens, and goggle systems. In this study, we designed an MR compatible, low-cost display unit based on organic light-emitting diodes (OLED) and demonstrated its performance.MethodsA 3.8” dual OLED module and an MIPI-to-HDMI converter board were used. The OLED module was enclosed using a shielded box to prevent noise emission from the display module and the potentially destructive absorption of high power RF from the MRI transmit pulses. The front of the OLED module was covered by a conductive, transparent mesh. Power was supplied from a non-magnetic battery. The shielding of the display was evaluated by directly measuring the electromagnetic emission with the aid of a pickup loop and a low noise amplifier, as well as by examining the signal-to-noise ratio (SNR) of phantom MRI data. The visual angle of the display was calculated and compared to standard solutions. As a proof of concept of the OLED display for fMRI, a healthy volunteer was presented with a visual block paradigm.ResultsThe OLED unit was successfully installed inside a 3 T MRI scanner bore. Operation of the OLED unit did not degrade the SNR of the phantom images. The fMRI data suggest that visual stimulation can be effectively delivered to subjects with the proposed OLED unit without any significant interference between the MRI acquisitions and the display module itself.DiscussionWe have constructed and evaluated the MR compatible, dual OLED display for fMRI studies. The proposed OLED display provides the benefits of high resolution, wide visual angle, and high contrast video images during fMRI exams.

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Monothiatruxene‐Based, Solution‐Processed Green, Sky‐Blue, and Deep‐Blue Organic Light‐Emitting Diodes with Efficiencies Beyond 5% Limit

Maciejczyk

Zhang

Hedley

et al. 2018

Adv Funct Materials

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The development of blue materials with good efficiency, even at high brightness, with excellent color purity, simple processing and high thermal stability assuring adequate device lifetime is an important remaining challenge for organic light-emitting didoes (OLEDs) in displays and lightning applications. Furthermore, these various features are typically mutually exclusive in practice. Herein, four novel green and blue light emitting materials based on a monothiatruxene core are reported together with their photophysical and thermal properties, and performance in solution-processed OLEDs. The materials showed excellent thermal properties with high glass transition temperatures ranging from 171 °C to 336 °C and decomposition temperatures from 352 °C to 442 °C. High external quantum efficiency of 3.7 % for a deep blue emitter with C.I.E. color co-ordinates (0.16, 0.09) and 7% for green

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Optimum perceived-brightness level considering the practical use environment for the mobile organic light-emitting diode display

Cited by 9 publications

References 5 publications

83‐2: Reliability Characterization of Luminance Degradation of OLED Mobile Display Considering Color Difference Index Based on Usage Patterns

83‐2: Reliability Characterization of Luminance Degradation of OLED Mobile Display Considering Color Difference Index Based on Usage Patterns

MR-compatible, 3.8 inch dual organic light-emitting diode (OLED) in-bore display for functional MRI

Monothiatruxene‐Based, Solution‐Processed Green, Sky‐Blue, and Deep‐Blue Organic Light‐Emitting Diodes with Efficiencies Beyond 5% Limit

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