Display Substrate Light-Absorbing Layer for Narrower QLED Emission

A light-absorbing layer is introduced as an intermediary component between the quantum dot electroluminescent layer and the observer. This layer selectively absorbs specific wavelength ranges of light emitted by the quantum dots, effectively narrowing the emission spectrum's full width at half maximum. By using this intermediary layer, the patent achieves improved color gamut without requiring tighter quantum dot particle size control, thus resolving the contradiction between manufacturing precision and color performance.

The light-absorbing layer is designed to serve multiple functions simultaneously: it narrows the emission spectrum to improve color gamut, maintains acceptable light emission efficiency, and can be integrated with existing quantum dot display structures. The layer uses materials with specific absorption characteristics that target the wings of the emission spectrum while preserving the peak intensity, achieving color enhancement without proportionally increasing device complexity.

The light-absorbing layer is designed with localized absorption characteristics that specifically target the wavelength regions at the edges (wings) of the quantum dot emission spectrum, while leaving the peak wavelength region largely unaffected. This selective, localized absorption approach narrows the full width at half maximum of the emission spectrum without significantly reducing the overall light emission efficiency, as the majority of emitted photons at the peak wavelength remain transmitted.