Optical Filter Reflective Layer Light Management
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Solution Overview
Problem
Current display devices with quantum dot-color conversion layers face challenges in improving color reproducibility and light-emitting efficiency due to inefficient light conversion and wasted incident light.
Innovation Solution
An optical filter is designed with a substrate having pixel areas and a light-blocking area, color filters, conversion layers with inclined side surfaces, and a reflective layer that extends to the light-blocking area, enhancing light utilization and conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If quantum dot-color conversion layer is used to improve color reproducibility, then color quality is improved, but light conversion efficiency is insufficient and incident light is wasted
Solution Approach 1:
The patent introduces a reflective layer that extends to the light-blocking area, creating a three-dimensional light management structure. This reflective layer redirects light that would otherwise be wasted in the light-blocking area back toward the pixel areas, adding a new dimension to light utilization and improving overall conversion efficiency while maintaining color quality
Solution Approach 2:
The patent modifies the optical parameters of the system by introducing a reflective layer with specific reflectivity characteristics. This changes the light distribution parameters, redirecting light paths and improving the utilization of incident light, thereby enhancing light conversion efficiency without compromising color reproducibility
2Measurement precision
If light-blocking area is used to separate pixel areas, then color purity is improved, but incident light is filtered out and wasted
Solution Approach 1:
The patent converts the harmful effect of the light-blocking area (filtering out and wasting incident light) into a beneficial effect by adding a reflective layer. This reflective layer takes the light that would be blocked and wasted, and redirects it back to the pixel areas, transforming the light-blocking area from a source of energy loss into a component that contributes to improved light utilization while maintaining color purity
3Measurement precision
If conversion layers are added to improve light conversion, then color quality is improved, but device complexity increases
Solution Approach 1:
The reflective layer serves multiple functions simultaneously: it redirects light from the light-blocking area back to the pixel areas, improves light conversion efficiency, and maintains color purity. By consolidating these functions into a single component, the patent improves color quality without proportionally increasing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optical filter improves light conversion efficiency and reduces wasted light, thereby enhancing color reproducibility and light-emitting efficiency in display devices.
Implementation Method 1
a reflective layer arranged on the at least one inclined side surface of each of the plurality of conversion layers. The reflective layer extends to the light-blocking area
Implementation Method 2
Quantum dots are excited by incident light to thereby emit light having a longer wavelength than that of the incident light
Data Source
AI summary
An optical filter includes a substrate including a plurality of pixel areas spaced apart from each other and a light-blocking area between the plurality of pixel areas, a plurality of color filters arranged on a first surface of the substrate and corresponding to the plurality of pixel areas, and a plurality of conversion layers arranged on the first surface of the substrate and corresponding to the plurality of color filters. Each of the conversion layers includes inclined side surfaces. The optical filter further includes a reflective layer on the inclined side surfaces of each of the plurality of conversion layers. The reflective layer extends to the light-blocking area and is arranged consecutively on two adjacent inclined side surfaces from among the inclined side surfaces of the plurality of conversion layers and the light-blocking area between the two adjacent inclined side surfaces.