To enhance external luminous efficiency and reduce power consumption in rigid top-emitting organic light-emitting diode (OLED) panels for mobile applications, a film color filter was introduced as a promising alternative for conventional polarizers. The film color filter exhibited higher transmittance in the red, green, and blue emission wavelength regions of OLEDs compared to the polarizer, thereby improving external luminous efficiency. However, its application also increases reflectance due to external light, which necessitates optimization strategies to mitigate this drawback. To address this issue, the internal reflection within the OLED panel was reduced by optimizing the capping layer (CPL) thickness from 60 to 40 nm. Additionally, a refractive index matching layer was implemented between the encapsulation glass and the CPL, resulting in a 24.5% reduction in the specular component included (SCI) reflectance and a decrease in the absolute value of the specular component excluded (SCE) reflection color coordinate. White efficiency typically decreases with the reduction of the CPL thickness; however, the Device B exhibited improvements of 13.7%, 16.8%, and 12.4% in white efficiency compared to the polarizer at the CPL thicknesses of 40, 50, and 60 nm, respectively. This enhancement was particularly pronounced in the blue emission region, where the luminous efficiency is inherently lower. These findings indicate that optimizing the CPL thickness to 40 nm in conjunction with the Device B effectively reduces SCI reflectance, improves SCE reflection color coordinate, and enhances white efficiency. This study demonstrates that replacing the conventional polarizer with a film color filter is a viable approach to achieving higher luminous efficiency in rigid top-emitting OLED panels for mobile devices.
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