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CCT-tunable LED device with excellent ACU by using micro-structure array film.

Qiu Chen, Zongtao Li, Kaihang Chen

    Optics Express
    |July 28, 2016
    PubMed
    Summary
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    A new microstructure array (MSA) film significantly enhances angular color uniformity (ACU) in correlated-color-temperature-tunable LEDs (CCT-tunable LEDs). This innovation improves color consistency across various CCTs with minimal light loss.

    Area of Science:

    • Optics and Photonics
    • Solid-State Lighting
    • Materials Science

    Background:

    • Correlated-color-temperature-tunable LEDs (CCT-tunable LEDs) offer versatile lighting but often suffer from poor angular color uniformity (ACU).
    • Maintaining consistent color appearance at different viewing angles is crucial for high-quality illumination.
    • Existing solutions for ACU improvement may involve trade-offs with luminous flux or complexity.

    Purpose of the Study:

    • To investigate the effectiveness of a microstructure array (MSA) film in enhancing the ACU of CCT-tunable LEDs.
    • To optimize the parameters of the MSA film, including its area and placement height relative to the LED.
    • To quantify the improvements in ACU and assess the impact on luminous flux.

    Main Methods:

    • Application of a microstructure array (MSA) film onto CCT-tunable LED packages.

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  • Systematic variation of MSA film coverage area and the air gap height (H) between the film and the LED.
  • Measurement and analysis of angular color uniformity (ACU) and luminous flux across the tunable CCT range (2700–6500 K).

    • Main Results:

    • The MSA film significantly improves ACU across the entire CCT tuning range.
    • Optimized configurations, such as a full-covering MSA film at H = 5 mm, drastically reduce CCT deviation.
    • For a 3000–4000 K CCT range, CCT deviation decreased from 1090 K to 218 K with only a 1.8% loss in luminous flux.

    Conclusions:

    • Microstructure array (MSA) films are a highly effective solution for improving the angular color uniformity (ACU) of CCT-tunable LEDs.
    • The proposed method offers a substantial enhancement in color consistency with negligible impact on lighting efficiency.
    • This technology holds promise for advanced display and lighting applications requiring precise color control.