Angular color variation in micron-scale light-emitting diode arrays

Yang, Shu; Wang, Po Hsun; Chao, Chia-Hsin; Chu, Chun Wen; Yeh, Yin Tien; Chen, Yu Sheng; Chang, Feng Pin; Fang, Y.H.; Lin, Chien-Chung; Wu, Chih I.

doi:10.1364/oe.27.0a1308

Cited by 25 publications

(19 citation statements)

References 25 publications

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“…Inorganic mLED/μLED inherently has a relatively narrow FWHM (18~30 nm) 99 , so the colour gamut mainly depends on the emission wavelength. Recently, 91.4% Rec.…”

Section: Colour Performancementioning

confidence: 99%

Mini-LED, Micro-LED and OLED displays: present status and future perspectives

et al. 2020

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Presently, liquid crystal displays (LCDs) and organic light-emitting diode (OLED) displays are two dominant flat panel display technologies. Recently, inorganic mini-LEDs (mLEDs) and micro-LEDs (μLEDs) have emerged by significantly enhancing the dynamic range of LCDs or as sunlight readable emissive displays. "mLED, OLED, or μLED: who wins?" is a heated debatable question. In this review, we conduct a comprehensive analysis on the material properties, device structures, and performance of mLED/μLED/OLED emissive displays and mLED backlit LCDs. We evaluate the power consumption and ambient contrast ratio of each display in depth and systematically compare the motion picture response time, dynamic range, and adaptability to flexible/transparent displays. The pros and cons of mLED, OLED, and μLED displays are analysed, and their future perspectives are discussed.

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“…Inorganic mLED/μLED inherently has a relatively narrow FWHM (18~30 nm) 99 , so the colour gamut mainly depends on the emission wavelength. Recently, 91.4% Rec.…”

Section: Colour Performancementioning

confidence: 99%

Mini-LED, Micro-LED and OLED displays: present status and future perspectives

et al. 2020

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“…[103][104][105] In μLED displays, the cavity effect is weak, so the central wavelength of RGB subpixels basically remains unchanged regardless of viewing angle. 106 However, a small LED chip size would lead to a nonnegligible sidewall emission, [107][108][109] and the refractive index difference between red LED and green and blue LEDs results in unmatched RGB radiation patterns. To reduce the unmatched angular radiation patterns between RGB μLEDs, a specially designed black matrix, LED taper angle, and optical structure have been proposed, 106,109,110 but the trade-off in light extraction efficiency should be considered.…”

Section: Viewing Anglementioning

confidence: 99%

Prospects and challenges of mini‐LED, OLED, and micro‐LED displays

et al. 2021

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Recently, "liquid crystal display (LCD), organic light-emitting diode (OLED), or micro-light-emitting diode (LED): who wins?" is a heated debatable question. In this review article, we provide a comprehensive overview of these three promising display technologies through nine display performance indicators, including ambient contrast ratio, motion picture response time, viewing angle and angular color shift, color gamut, resolution density, power consumption, cost, lifetime, and thin profile and panel flexibility. The advantages and disadvantages of each technology are analyzed, and their future perspectives are discussed.

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“…In addition, the LEE of the blue FC micro-LED increased by 46.5% over that of the blue TFFC micro-LED. The optical parameters of the layers of RGB micro-LEDs are shown in Table 1 [1]. The central wavelengths were 622 µm, 527 µm, and 470 µm for RGB micro-LEDs.…”

Section: Simulation Modelmentioning

confidence: 99%

“…Micro-scale light emitting diodes (micro-LEDs) whose size is smaller than 100 µm have been considered as the next generation display technology because of their outstanding features, such as high dynamic range, good sunlight readability, long lifetime, low power consumption, and wide color gamut [1][2][3]. Their deployment in wearable devices, cell phones, outdoor displays, and augmented reality is highly anticipated [4,5].…”

Section: Introductionmentioning

confidence: 99%

Light Extraction Analysis of AlGaInP Based Red and GaN Based Blue/Green Flip-Chip Micro-LEDs Using the Monte Carlo Ray Tracing Method

et al. 2019

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Micro-scale light emitting diodes (micro-LEDs) commonly employ a thin-film flip-chip (TFFC) structure whose substrate is lifted off by an excimer laser. However, flip-chip (FC) micro-LEDs with a substrate can provide a sharp rise on sidewall emission by increasing the sidewall area. Here, we investigate the influence of substrate thickness, encapsulation, surface texture, microstructures between the substrate and epilayer, as well as the size, cutting shape, and angle of the chip on the light extraction efficiencies (LEEs) of FC micro-LEDs by using the Monte Carlo ray tracing method. We find that the LEE of the blue FC micro-LED chip increases by 46.5% over that of the blue TFFC micro-LED chip. After the encapsulation with the epoxy lens is applied, the LEEs of the blue TFFC micro-LED and blue FC micro-LED increase by 129% and 110.5%, respectively. The underlying mechanisms for the use of surface texture, patterned sapphire substrate, air-void array, and chip shaping technologies to improve the LEEs of FC micro-LEDs are also investigated in detail. We find that the LEEs AlGaInP based red FC micro-LED and GaN based blue/green FC micro-LEDs exhibit a sharp rise when the chip size drops from 30 to 10 µm. The inverted trapezoid FC micro-LED with patterned sapphire substrate (PSS) and encapsulation shows extraordinarily strong top emission and high collimation. We believe that our study offers a promising and practical route for obtaining high efficiency micro-LEDs.

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Angular color variation in micron-scale light-emitting diode arrays

Cited by 25 publications

References 25 publications

Mini-LED, Micro-LED and OLED displays: present status and future perspectives

Mini-LED, Micro-LED and OLED displays: present status and future perspectives

Prospects and challenges of mini‐LED, OLED, and micro‐LED displays

Light Extraction Analysis of AlGaInP Based Red and GaN Based Blue/Green Flip-Chip Micro-LEDs Using the Monte Carlo Ray Tracing Method

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