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Next generation smart window display using transparent organic display and light blocking screen.

Gyeong Woo Kim, Raju Lampande, Dong Cheol Choe

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    We developed a high-performance smart window display by integrating a light-blocking screen with a transparent organic light-emitting diode (TOLED). This advanced display offers tunable contrast and adjustable daylight intensity for interactive applications.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Display Technology

    Background:

    • Transparent organic light-emitting diodes (TOLEDs) are crucial for next-generation displays, including large transparent windows and interactive interfaces.
    • Existing TOLEDs require enhancement for applications demanding dynamic light control and superior contrast.

    Purpose of the Study:

    • To develop a high-performance and stable smart window display with facile fabrication.
    • To integrate a high-performance light-blocking screen with a transparent white OLED panel for advanced functionality.

    Main Methods:

    • Fabrication of a smart window display by integrating a light-blocking screen and a transparent white OLED panel.
    • Characterization of the smart window display's optical properties, including transmittance and ambient contrast ratio.
    • Evaluation of the light-blocking screen's performance, including transmittance, absorbance, optical contrast, stability, switching time, and driving voltage.

    Main Results:

    • The smart window display achieved a maximum transmittance of 64.2% at 600 nm and a tunable ambient contrast ratio of 171.94:1.
    • The integrated light-blocking screen demonstrated high transmittance (85.56% at 562 nm), superior absorbance (2.30 at 562 nm), high optical contrast (85.50 at 562 nm), and excellent optical stability (>25,000 cycles).
    • The light-blocking screen exhibited a fast switching time of 1.9 seconds and a low driving voltage of 1.7 V, validated by optical simulations.

    Conclusions:

    • The proposed smart window display technology enables convenient and rapid adjustment of daylight intensity.
    • This integrated system offers significant improvements in contrast and light control compared to conventional TOLEDs.
    • The developed technology holds promise for advanced interactive displays and smart window applications.