COLOR FILTER STRUCTURE AND display Device

The color filter structure with quantum dots and semiconductor nanoparticles enhances color purity and brightness by absorbing unconverted light and reducing reflection, addressing issues in existing display technologies.

KR1020260112964APending Publication Date: 2026-07-21LG DISPLAY CO LTD
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Patent Information

Authority / Receiving Office
KR · KR
Patent Type
Applications
Current Assignee / Owner
LG DISPLAY CO LTD
Filing Date
2026-07-09
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing display devices face issues with low color purity and brightness due to light loss through color filters and total internal reflection at the interface between light conversion and low-refractive-index layers, particularly when using quantum dots for light conversion.

Method used

A color filter structure incorporating a light-converting layer with core/shell structured quantum dots and a light-absorbing layer with semiconductor nanoparticles dispersed in resin, where the absorption layer absorbs unconverted light and has the same refractive index as the conversion layer to prevent total reflection.

Benefits of technology

Improves color purity and brightness by absorbing unconverted light and minimizing reflection, resulting in high color reproducibility and brightness in display devices.

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Abstract

One embodiment of the present invention is a color filter structure for converting the wavelength of light emitted from a light-emitting element, comprising a light conversion layer comprising a first resin and quantum dots having a core / shell structure dispersed within the first resin, and a light absorption layer stacked on the light conversion layer. The light absorption layer comprises a second resin and semiconductor nanoparticles dispersed within the second resin that absorb light emitted from the light-emitting element. Accordingly, the color filter structure according to the present invention can improve the color purity and brightness of the emitted light.
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