Tripling the Optical Efficiency of Color-Converted Micro-LED Displays with Funnel-Tube Array

Gou, Fangwang; Hsiang, En‐Lin; Tan, Guanjun; Lan, Yi‐Fen; Tsai, Cheng‐Yeh; Wu, Shin‐Tson

doi:10.3390/cryst9010039

Cited by 54 publications

(42 citation statements)

References 23 publications

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“…To improve light efficiency and eliminate color crosstalk of color-converted micro-LED displays, Gou et al have proposed a funnel-tube array design in color-converted micro-LED displays with color filter [66]. Based on device simulation and modeling, it was found that by using funnel-tube array to confine phosphors inside each subpixel, the optical efficiency of the micro-LED display can be improved by ~3 times, while the crosstalk is eliminated.…”

Section: Full-color Schemesmentioning

confidence: 99%

Micro-LEDs, a Manufacturability Perspective

et al. 2019

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Compared with conventional display technologies, liquid crystal display (LCD), and organic light emitting diode (OLED), micro-LED displays possess potential advantages such as high contrast, fast response, and relatively wide color gamut, low power consumption, and long lifetime. Therefore, micro-LED displays are deemed as a promising technology that could replace LCD and OLED at least in some applications. While the prospects are bright, there are still some technological challenges that have not yet been fully resolved in order to realize the high volume commercialization, which include efficient and reliable assembly of individual LED dies into addressable arrays, full-color schemes, defect and yield management, repair technology and cost control. In this article, we review the recent technological developments of micro-LEDs from various aspects.

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Section: Full-color Schemesmentioning

confidence: 99%

Micro-LEDs, a Manufacturability Perspective

et al. 2019

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“…The second receiver is able to receive light from the whole panel, and the collected light intensity is P total . The color crosstalk ratio is defined as R crosstalk , which can be calculated using the following Equation 7 [20,21].…”

Section: Optical Simulation For Gan Based Micro-led With Qds Filmmentioning

confidence: 99%

Analysis of Factors Affecting Optical Performance of GaN-Based Micro-LEDs with Quantum Dots Films

et al. 2020

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Optical performance in terms of light efficiency, color crosstalk and ambient contrast ratio were analyzed for blue GaN-based micro-light emitting diodes (micro-LEDs) combined with red/green quantum dots (QDs)-polymethyl methacrylate (PMMA) films. The thickness and mass ratio of QDs films are two critical factors in affecting the performance of micro-LEDs. Firstly, the precise optical modeling of QDs-PMMA films is established based on the double integrating sphere (DIS) testing system and inverse adding doubling algorithm (IADA) theory. Red and green QDs-PMMA films are composed of ZnCdSe/ZnS QDs and green ZnCdSeS/ZnS QDs, respectively. The fundamental optical parameters of QDs-PMMA films, including scattering, absorption and anisotropy coefficients, are obtained successfully. Secondly, based on these optical parameters, the Monte Carlo ray tracing method is applied to analyze the effect of a QDs-PMMA film’s thickness and mass ratio on the optical performance of micro-LEDs. Results reveal that the light efficiency first increases and then decreases with the increase of a QDs film’s thickness or mass ratio, owing to the scattering characteristics of QDs. Different from the variation tendencies of light efficiency, the crosstalk between adjacent pixels increases as the QDs-PMMA film’s thickness or mass ratio increases, and the ambient contrast ratio is kept stable when the thickness increases. The mass ratio variation of QDs film can change the optical performance of micro-LEDs more effectively than thickness, which demonstrates that mass ratio is a more important factor affecting the optical performance of micro-LEDs.

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“…Although only the RGB subpixels inside the white dashed lines are turned on, light leakage outside this region is clearly observed. This problem becomes more severe as the phosphor film gets thicker …”

Section: Device Structurementioning

confidence: 99%

“…This problem becomes more severe as the phosphor film gets thicker. 14,15 To eliminate color crosstalk, we propose a funnel tube array with taper angles α and β (Device 2) as illustrated in Figure 3A and 3B. It is formed above micro-LED layer while the tube region aligned with each subpixel.…”

Section: Device Structurementioning

confidence: 99%

High performance color‐converted micro‐LED displays

et al. 2019

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A full‐color micro‐LED display can be achieved by red, green, and blue (RGB) chips or by a blue/ultraviolet (UV) micro‐LED array to pump downconverters. The latter helps relieve the burden of epitaxial growth of tri‐color micro‐LED chips. However, such a color‐converted micro‐LED system usually suffers from color crosstalk and low efficiency due to limited optical density of color converters. With funnel‐tube array and reflective coating on its inner surface, the crosstalk is eliminated, and the optical efficiency can be improved by more than two times. In addition, the ambient contrast ratio is also improved because of higher light intensity. The color gamut of this device is approximately 92% of DCI‐P3 standard.

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Tripling the Optical Efficiency of Color-Converted Micro-LED Displays with Funnel-Tube Array

Cited by 54 publications

References 23 publications

Micro-LEDs, a Manufacturability Perspective

Micro-LEDs, a Manufacturability Perspective

Analysis of Factors Affecting Optical Performance of GaN-Based Micro-LEDs with Quantum Dots Films

High performance color‐converted micro‐LED displays

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