Display Device Light Emitting Layers External Light Reflection
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Solution Overview
Problem
Display devices face issues with external light reflection and scattering, particularly in outdoor use, where the existing methods are inadequate in reducing reflection without compromising luminous efficiency.
Innovation Solution
Incorporating specific compounds in the light emitting layers and auxiliary layers of the display device, along with an inorganic absorption layer and a low-reflection inorganic layer, to absorb external light and reduce reflectance without affecting luminous efficiency, and optionally excluding polarization and color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods are used to reduce external light reflection, then reflection is reduced, but luminous efficiency deteriorates
Solution Approach 1:
The patent applies local quality by introducing specific compounds (Chemical Formulas 1-6) into particular layers (light emitting layers and auxiliary layers) rather than uniformly treating the entire display structure. Each compound is strategically placed in layers where it can selectively absorb external light without interfering with the light emission process, thus reducing reflection locally while preserving luminous efficiency globally.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical composition of specific layers through the addition of compounds with controlled concentrations (1 wt% to 50 wt%). These parameter changes enable the layers to absorb external light at specific wavelengths while maintaining their light-emitting properties, thereby reducing reflection without sacrificing luminous efficiency.
2Object-affected harmful factors
If polarization layers and color filters are included, then reflection control is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing light emitting layers and auxiliary layers that simultaneously perform multiple functions: emitting light, controlling reflection, and potentially filtering wavelengths. The compounds introduced into these layers provide reflection control without requiring separate polarization layers and color filters, thereby reducing device complexity while maintaining reflection control effectiveness.
Solution Approach 2:
The patent merges the functions of light emission and reflection control into the same layers (light emitting layers and auxiliary layers). By combining these functions, the patent eliminates the need for separate polarization layers and color filters, thus reducing device complexity while achieving effective reflection control.
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 solution effectively reduces external light reflection, improving the visibility of the display device's image under bright conditions while maintaining or enhancing luminous efficiency, as demonstrated by the decrease in reflectance with varying concentrations of the compounds used.
Implementation Method 1
the red light emitting layer and/or the red auxiliary layer includes a compound represented by Chemical Formula 1 and/or a compound represented by Chemical Formula 2
Implementation Method 2
an inorganic absorption layer between the capping layer and the encapsulation layer and/or between the capping layer and the second electrode, and the inorganic absorption layer may include bismuth
Implementation Method 3
a light emitting device on the substrate. The light emitting device includes a first electrode, a red auxiliary layer on the first electrode, a red light emitting layer on the red auxiliary layer, and a second electrode on the red light emitting layer
Data Source
AI summary
A display device according to an embodiment includes: a substrate; and a plurality of light emitting devices disposed above the substrate. The light emitting device includes a first electrode, an auxiliary layer disposed above the first electrode, a light emitting layer disposed on the auxiliary layer, and a second electrode disposed above the light emitting layer, and a red light emitting layer and/or the auxiliary layer includes a discussed compound, e.g., a compound represented by Chemical Formula 1 and/or a compound represented by Chemical Formula 2.