Display Device Color Filter Scattering Agent
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Solution Overview
Problem
Display devices face reduced display quality due to external light reflection, which affects viewing angle-dependent color and luminance differences.
Innovation Solution
Incorporating a color filter member with spaced color filter portions, each containing a scattering agent with varying concentrations, to scatter external light and minimize reflectance while maintaining luminance, including organic electroluminescent elements and an organic layer with scattering agents to improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a color filter member is used to reduce external light reflection, then reflectance is reduced, but transmittance is also reduced which lowers luminance
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different light types within the color filter member. The scattering agent is selectively applied to scatter external light (harmful reflection) while allowing emitted display light to pass through with minimal scattering. This is achieved by positioning the scattering agent in the color filter layer and controlling its properties to affect primarily the external light path.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the size, concentration, and refractive index of the scattering agent particles. By optimizing these parameters, the filter achieves maximum scattering of external light while minimizing impact on display light transmittance. The scattering agent particle size is specifically controlled to be in a range that effectively scatters external light wavelengths.
2Stability of the object's composition
If scattering agents are added to color filters to scatter light, then color difference according to viewing angle is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the scattering agent incorporation step with the existing color filter manufacturing process. Rather than adding a separate scattering treatment step, the scattering agent is integrated into the color filter layer formation process, allowing both functions (color filtering and light scattering) to be achieved in a single manufacturing step, thus minimizing additional complexity.
Solution Approach 2:
The color filter member is designed to perform multiple functions simultaneously: it provides color filtering, reduces external light reflection through scattering, and maintains viewing angle stability. By making the color filter layer multi-functional through the addition of scattering agents, the patent eliminates the need for separate components, thereby reducing overall device complexity despite the enhanced functionality.
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 color and luminance differences across viewing angles, enhancing display quality by minimizing external light reflection and maintaining high luminance levels.
Implementation Method 1
a scattering agent included in at least one of a plurality of color filter portions and an organic layer
Data Source
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AI summary
A display device (DS) includes: a display panel (DP); and a color filter (CFP) on the display panel (DP) and including a plurality of color filter portions (CCF1, CCF2, CCF3), wherein at least one color filter portion (CCF1, CCF2, CCF3) of the color filter portions (CCF1, CCF2, CCF3) comprises a scattering agent (SP) having an average diameter (DSP) of 50 nanometers (nm) or more and 500 nm or less, preferably of 100 nanometers (nm) or more and 400 nm or less, more preferably of 200 nanometers (nm) or more and 300 nm or less.