Tripling Light Conversion Efficiency of μLED Displays by Light Recycling Black Matrix

Zhang, Xiang; Chen, Anlan; Yang, Tao; Cai, Junhu; Ye, Yuanyuan; Chen, Enguo; Xu, Sheng; Ye, Yun; Sun, Jie; Yan, Frank; Guo, Tailiang

doi:10.1109/jphot.2022.3148241

Cited by 17 publications

(8 citation statements)

References 52 publications

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“…In addition, using green and red QD color conversion layers (QDCCLs) integrated into the display panel is another color realization strategy for self-emissive displays [107][108][109][110]. The green and red emission can be obtained with the excitation of the blue OLED or blue LED [111,112]. The display applications based on the PL characteristic of PQDs are shown in Figure 8 for clear comparison.…”

Section: Progress Of Pqds In Displaysmentioning

confidence: 99%

Perovskite Quantum Dots for Emerging Displays: Recent Progress and Perspectives

et al. 2022

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The excellent luminescence properties of perovskite quantum dots (PQDs), including wide excitation wavelength range, adjustable emission wavelength, narrow full width at half maximum (FWHM), and high photoluminescence quantum yield (PLQY), highly match the application requirements in emerging displays. Starting from the fundamental structure and the related optical properties, this paper first introduces the existing synthesis approaches of PQDs that have been and will potentially be used for display devices, and then summarizes the stability improving approaches with high retention of PQDs’ optical performance. Based on the above, the recent research progress of PQDs in displays is further elaborated. For photoluminescent display applications, the PQDs can be embedded in the backlighting device or color filter for liquid crystal displays (LCD), or they may function as the color conversion layer for blue organic light-emitting diodes (OLED) and blue micro-scale light-emitting diodes (μLED). In terms of next-generation electroluminescent displays, notable progress in perovskite quantum-dot light emitting diodes (PeQLED) has been achieved within the past decade, especially the maximum external quantum efficiency (EQE). To conclude, the key directions for future PQD development are summarized for promising prospects and widespread applications in display fields.

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Section: Progress Of Pqds In Displaysmentioning

confidence: 99%

Perovskite Quantum Dots for Emerging Displays: Recent Progress and Perspectives

et al. 2022

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“…Currently, full-color micro-LEDs mainly have two technical routes, QDCC and RGB tandem layer [14][15][16][17][18][19][20][21][22][23][24][25] , in which the former is more appealing. To explore the feasibility of a full-color single-integrated micro-LED chip with QDCC, we build an optical engine model with a blue light and red/green QDCC layer.…”

Section: Light Tracing With Quantum-dot Color Conversion (Qdcc) Layermentioning

confidence: 99%

Design of self-luminous pico-projection optical engine based on a quantum-dot color converted micro-LED

Jiang

Lin²,

Li³

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

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Micro-LED will probably become the next epochal display technology, which has combined the advantages of liquid crystal display (LCD) and organic light-emitting diode (OLED). Its self-luminous characteristic will greatly compress the volume of the projection optical engine into truly pico-projection level. However, the relevant design and research are still insufficient. In this paper, we design a four-piece sphere lens group with a 5 mm focal length for micro-LED pico-projection, and then a simulation model of self-luminous projection optical engine is built for demonstration. The total length of the projection lens group is only 8.2mm, the modulation transfer function (MTF) is higher than 0.5@66lp/mm, and the distortion is below 1%. The irradiance distribution shows that the light efficiency is 44.9 % and the uniformity reaches 81.3% when the light divergence angle of micro-LEDs is set to 30°. Then, we explore the influence on light efficiency with different light source divergence angles and determine the optimal range of divergence angles. Finally, a R/G/B integrated micro-LED source with blue light and the above red/green quantum-dot color conversion (QDCC) layer is built, proving the feasibility of a full-color pico-projection optical engine with a single-integrated micro-LED chip.

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“…1 With the progress of information technology, the projector is developing towards the direction of miniaturization gradually, but the passive light-emitting engines bring complex system structure, large size, and low efficiency, which have hindered their integrated development. 2 Compared with passive lightemitting technology, micro-LED (μLED) is a kind of selfemitting micro-display device with individually driven sub-pixels, 3 which has faster response, higher efficiency, and lower power consumption. 4 These characteristics are more suitable for the development direction of picoprojectors.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient and ultra‐compact micro‐LED pico‐projector based on a microlens array

Jiang

Yan

et al. 2023

J Soc Info Display

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Pico-projection displays are the main developing direction for future projection displays, but the balance between the optical efficiency and the system size is still a big concern. This paper presents a pico-projector design based on micro-LED (μLED) light sources. Firstly, based on the analysis of the characteristics of μLED, a highly integrated microlens array is designed to improve the system efficiency by reshaping the spatial light distribution. In addition, the matching relationship between the aperture angle of projection lens and the divergence angle of μLED is studied, and on this basis, a set of four-piece spherical lens group is proposed to achieve compact size. Simulation results show that the μLED equipped with the microlens array can concentrate about 86% of the light energy within a dispersion angle of ±20 , thus increasing the light energy utilization by about 3.5 times and reducing the size of the pico-projector to 30.18 mm 3 . The designed pico-projector has high performance and compact size with great potential for future applications.

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Tripling Light Conversion Efficiency of μLED Displays by Light Recycling Black Matrix

Cited by 17 publications

References 52 publications

Perovskite Quantum Dots for Emerging Displays: Recent Progress and Perspectives

Perovskite Quantum Dots for Emerging Displays: Recent Progress and Perspectives

Design of self-luminous pico-projection optical engine based on a quantum-dot color converted micro-LED

Highly efficient and ultra‐compact micro‐LED pico‐projector based on a microlens array

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