Color Conversion Display Stack With Low-Index Light Recycling
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Solution Overview
Problem
Display devices suffer from reduced luminous efficiency due to unconverted light being blocked by color filters, as color conversion materials do not fully convert light of a specific wavelength into desired colors.
Innovation Solution
Incorporating a low refractive layer with low refractive structures and a planarization layer to selectively reflect unconverted light back to the color conversion layer for re-conversion, thereby increasing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a color filter is used to block unconverted light, then color purity is improved, but luminous efficiency deteriorates due to light loss
Solution Approach 1:
The patent implements a feedback mechanism by introducing a reflective layer that redirects unconverted light back to the color conversion layer. This allows the color conversion material to receive another opportunity to convert the light, creating a循环利用 (recycling) process that reduces light loss while maintaining color purity through the selective reflection and re-conversion cycle.
Solution Approach 2:
The patent introduces a reflective layer as an intermediary component between the color conversion layer and the color filter. This intermediary redirects unconverted light back to the color conversion layer before it reaches the color filter, enabling additional conversion opportunities and reducing the amount of light that needs to be blocked by the filter, thus improving luminous efficiency while maintaining color purity.
2Measurement precision
If a color conversion material is used to convert light wavelength, then desired color output is improved, but luminous efficiency deteriorates due to incomplete conversion
Solution Approach 1:
The patent ensures continuity of useful action by implementing a reflective layer that redirects unconverted light back to the color conversion layer. This creates a continuous conversion process where light that was not converted in the first pass gets another opportunity, maximizing the utilization of the color conversion material and improving luminous efficiency while maintaining color accuracy.
Solution Approach 2:
The patent applies the discarding and recovering principle by capturing unconverted light (which would otherwise be discarded or blocked) through the reflective layer and redirecting it back to the color conversion layer for another conversion attempt. This recovery process reduces energy loss and improves luminous efficiency while maintaining the desired color output.
3Loss of energy
If a low refractive layer with low refractive structures is introduced to recycle light, then luminous efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs a low refractive layer containing low refractive structures (such as hollow particles or porous structures) that create optical pathways for light recycling. These porous or structured materials provide the necessary refractive index difference to redirect light effectively while maintaining a relatively simple layer configuration, thus improving luminous efficiency without excessive complexity increase.
Solution Approach 2:
The patent uses composite materials by combining the low refractive layer with specific refractive index properties with the existing color conversion and color filter layers. This composite structure enables effective light recycling through refractive index differences while integrating smoothly with the existing device architecture, minimizing the increase in overall 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 low refractive layer effectively recycles unconverted light, enhancing the luminous efficiency of the display device by ensuring maximum utilization of light conversion.
Implementation Method 1
a low refractive layer on the first color conversion layer and including only low refractive structures, i.e., low refractive particles, the low refractive layer having a refractive index of about 1.3 or less, and the low refractive structures having an index of refraction lower than the index of refraction of the first color conversion layer
Data Source
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AI summary
A display device may include a substrate (SUB), a first color conversion layer (CCR, CCG, CCB) on the substrate, a low refractive layer (LR) on the first color conversion layer and including low refractive structures, a planarization layer (PL) on the low refractive layer, and a first color filter (CFR, CFG, CFB) on the planarization layer. The planarization layer may also be between the low refractive structures.