Color Conversion Layout for Stable Display Viewing Angles
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Solution Overview
Problem
Existing light emitting display devices suffer from color viewing angle issues due to the placement of black matrices between color conversion units, leading to color changes based on the observer's position, and residue formation during the manufacturing process.
Innovation Solution
The implementation of a black matrix on overlapping areas of color conversion units and an auxiliary electrode pattern between these units, with the auxiliary electrode pattern being narrower and further inward than the black matrix, to improve color viewing angle properties and remove manufacturing residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the black matrix is placed between color conversion units, then color viewing angle properties improve, but manufacturing residues increase
Solution Approach 1:
The patent divides the black matrix structure into two distinct components: a black matrix layer and an auxiliary electrode pattern. This segmentation allows each component to perform its specific function - the black matrix provides color viewing angle stability while the auxiliary electrode pattern eliminates manufacturing residues through its etching function.
Solution Approach 2:
The auxiliary electrode pattern acts as an intermediary element between the black matrix and the color conversion units. It mediates the problem of manufacturing residues by providing a sacrificial structure that can be selectively removed, thereby cleaning the interface between the black matrix and color conversion units without compromising the black matrix's optical function.
2Reliability
If the black matrix is placed closer to emission areas, then color viewing angle stability improves, but light transmittance decreases
Solution Approach 1:
The patent applies local quality by making the auxiliary electrode pattern narrower than the black matrix. This creates a localized structure where the electrode pattern is positioned inward from the black matrix edges, allowing light to pass through the wider black matrix area while the narrower electrode pattern provides sufficient etching function only where needed.
Solution Approach 2:
The auxiliary electrode pattern extends partially beyond what would be strictly necessary for structural support, reaching inward from the black matrix edges. This partial extension is sufficient to remove manufacturing residues in the critical areas without requiring the electrode pattern to span the entire black matrix width, thereby preserving light transmittance.
Data Source
AI summary
A light emitting display device includes color conversion units on a first substrate, each of the color conversion units having an overlapping area and a non-overlapping area, a black matrix on the overlapping area of each of the color conversion units, and an auxiliary electrode pattern between the black matrix and each of the color conversion units, the auxiliary electrode pattern farther inwards than the black matrix.