Third Color Material for Display Device Light Blocking
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Solution Overview
Problem
Current display devices face challenges in achieving optimal color purity and minimizing external light reflection, particularly due to irregularities in the upper surface of color filters which lead to diffuse reflection and reduced image quality.
Innovation Solution
The display device incorporates a structure with a third color material having a lower reflectance and refractive index than the first and second color filters, positioned between their end portions with a gap, and in contact with their side surfaces, along with an insulating layer and an overcoat layer to reduce diffuse reflection and enhance light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used to achieve color purity, then color quality is improved, but irregularities in the upper surface of color filters cause diffuse reflection of external light, worsening image quality
Solution Approach 1:
The patent applies local quality by introducing a third color material specifically at the end portions of the first and second color filters, rather than uniformly treating the entire filter structure. This localized application addresses the diffuse reflection problem at specific locations where it occurs most, while preserving the color purity function of the main filter areas.
Solution Approach 2:
The third color material acts as an intermediary element between the first and second color filters. It fills the gap between adjacent color filters and covers their end portions, serving as a mediating structure that reduces diffuse reflection at the interfaces between different color filter regions while maintaining overall color purity.
2Productivity
If color filters are positioned close together to maximize display area, then productivity is improved, but light blocking between adjacent color filters deteriorates
Solution Approach 1:
The third color material is selectively applied at the end portions and gaps between color filters, providing localized light blocking where it is most needed. This allows the main body of color filters to remain close together for maximum display area, while the third color material addresses light leakage at critical interface regions.
Solution Approach 2:
The structure introduces asymmetry by adding the third color material specifically at the end portions of color filters rather than uniformly across all surfaces. This asymmetric configuration targets light blocking where gaps and interfaces occur, allowing optimized spacing between color filters while preventing light leakage at critical locations.
3Object-affected harmful factors
If the upper surface of color filters is made flat to reduce diffuse reflection, then image quality is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of attempting to make the upper surface of color filters flat (which would require complex manufacturing control), the patent inverts the approach by adding a third color material that covers the end portions and gaps. This reverses the problem-solving strategy from modifying the existing surface to adding a complementary structure that addresses diffuse reflection at critical locations.
Solution Approach 2:
The third color material is applied locally at the end portions of color filters where diffuse reflection and light leakage are most problematic, rather than requiring uniform flatness across the entire upper surface. This localized approach significantly reduces diffuse reflection while maintaining simpler manufacturing processes.
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
This configuration effectively minimizes diffuse reflection by about 48% and improves light blocking, maintaining color mixing and absorption functions while reducing external light reflection.
Implementation Method 1
A reflectance of the third color material may be less than a reflectance of a first color material of the first color filter and less than a reflectance of a second color material of the second color filter in a wavelength band of about 380 nm to about 780 nm
Implementation Method 2
a color conversion part configured to convert light emitted from one of the first light-emitting diode and the second light-emitting diode into light of a different color
Data Source
AI summary
A display device includes first and second light-emitting diodes in respective first and second emission areas, an encapsulation layer thereon, and including at least one inorganic encapsulation layer and at least one organic encapsulation layer, a color conversion-transmission layer on the encapsulation layer, and including a color conversion part to convert light emitted from the first or second light-emitting diodes into a different color, and a light blocking partition wall surrounding the color conversion part, first and second color filters on the color conversion-transmission layer, and respectively corresponding to the first and second emission areas, wherein respective first end portions of the first and second color filters are spaced from each other while overlapping the light blocking partition wall, and are partly covered with a third color material having a color that is different from the first and second color filters.