52‐4: Micro LED Display Light Extraction Efficiency Improvement by Secondary Optics on Substrate

Micro LED displays are widely acknowledged as forthcoming display innovations. However, due to the micro LED device size reductions, the light extraction efficiency of micro LED devices will be compromised. This paper extends the EQE equation and implement a LEE secondary optics (the secondary optic...

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Bibliographic Details
Published inSID International Symposium Digest of technical papers Vol. 55; no. 1; pp. 717 - 720
Main Authors Wu, Yang-En, Hsu, Jia-Hao, Chen, Kuan-Hsun, Tien, Kun-Cheng, Kuo, Hao-Chung
Format Journal Article
LanguageEnglish
Published Campbell Wiley Subscription Services, Inc 01.06.2024
Subjects
Angle of reflection
Display devices
Efficiency
lens
light efficiency
Light emitting diodes
Light reflection
Luminous intensity
Micro LED
normal angle light intensity
sidewall effect
Substrates
white glue
εLED
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Summary:Micro LED displays are widely acknowledged as forthcoming display innovations. However, due to the micro LED device size reductions, the light extraction efficiency of micro LED devices will be compromised. This paper extends the EQE equation and implement a LEE secondary optics (the secondary optics of light extraction efficiency) factor. The paper also presents few directions to enhance the normal angle light intensity for micro LED displays. Our sample preparations have confirmed that a white glue layer can bring about an improvement of over 100%, and a lens with a protection layer can also boost the normal angle light intensity by 45%. Considering the overall display performance including surface reflection, we simulated a condition that can improve the normal angle light intensity by over 70% in micro LED displays.
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ISSN:0097-966X
2168-0159
DOI:10.1002/sdtp.17626