Display Device Metal Pattern Spacing for Wide-Angle Color Consistency
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Solution Overview
Problem
Display devices experience color distortion when viewed from various angles, necessitating improved luminance deviation characteristics to maintain image quality across different viewing angles.
Innovation Solution
A display device design featuring a substrate with a transistor, a first planarization layer, a metal pattern, and a bank with multiple openings of varying sizes, where the metal pattern is symmetrically spaced under these openings to enhance color viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display device structures are used, then manufacturing is simpler, but color coordinates are distorted when viewed from various angles
Solution Approach 1:
The patent introduces asymmetric metal patterns with different configurations (first, second, and third metal patterns with varying widths and positions) to compensate for luminance deviation. The asymmetric arrangement of these metal patterns relative to the organic light-emitting layer creates differential optical path adjustments that correct color distortion when viewed from angles other than perpendicular to the display surface.
Solution Approach 2:
The display device structure is segmented into multiple functional layers including first and second planarization layers, multiple metal patterns, and a bank structure with openings. This segmentation allows each layer to perform specific functions in correcting luminance deviation, with the metal patterns providing electrical connectivity and optical correction, and the planarization layers providing structural support and positioning.
2Reliability
If metal patterns are added to correct luminance deviation, then color viewing angle characteristics improve, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions into the metal patterns: they serve as both electrical connection elements and optical correction elements for luminance deviation. The first, second, and third metal patterns are integrated into the same structural layer, eliminating the need for separate components and reducing the number of manufacturing steps despite the increased functional complexity.
3Reliability
If asymmetric metal patterns are used, then color distortion is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent designs the metal patterns with symmetric spacing relationships (first metal pattern on one side, second and third metal patterns on the other side) that create balanced optical paths. This equipotential-like symmetry in the asymmetric configuration reduces sensitivity to manufacturing variations, as errors in one direction are compensated by the balanced structure in the opposite direction.
Data Source
AI summary
A display device includes a substrate, a transistor disposed on the substrate and including a first source-drain electrode material pattern, an active layer, and a gate electrode positioned to overlap the active layer, a first planarization layer disposed on the first source-drain electrode material pattern of the transistor, a metal pattern disposed on the first planarization layer and electrically connected to the transistor, a second planarization layer covering the metal pattern and a bank disposed on the second planarization layer and including a plurality of openings of different sizes, wherein the metal pattern is spaced apart at the same interval in regions under the plurality of openings of different sizes. According to embodiments of the present specification, it is possible to provide a display device with improved color vision angle characteristics.