Black Matrix Layering for Optical Uniformity in OLED Displays
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Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in maintaining uniform optical characteristics across different viewing angles due to variations in the thickness of the encapsulation organic layer, leading to degradation in display quality.
Innovation Solution
The display apparatus incorporates a layered structure with distinct black matrices and touch electrode layers in central and peripheral areas, where the black matrices are positioned relative to the organic light emitting diodes to compensate for the thickness differences in the encapsulation organic layer, enhancing optical characteristics and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the encapsulation organic layer thickness is uniform across the display panel, then the manufacturing process is simpler, but the optical characteristics vary due to the curvature of the display element
Solution Approach 1:
The patent applies local quality by positioning the black matrix at different heights in different regions of the display panel. Specifically, the black matrix is positioned at a first height in the central area and at a second height (higher than the first) in the peripheral area. This regional differentiation compensates for the thickness variation of the encapsulation organic layer, ensuring uniform optical characteristics across the entire display panel while maintaining a relatively simple manufacturing process.
2Device complexity
If the black matrix is positioned at a single height level, then the device structure is simpler, but the optical characteristics cannot be compensated for thickness variations in the encapsulation layer
Solution Approach 1:
The patent segments the black matrix into multiple height levels based on regional requirements. The black matrix is divided into a first black matrix in the central area at a first height and a second black matrix in the peripheral area at a second height. This segmentation allows each region to have the appropriate black matrix positioning for optimal optical performance, compensating for the encapsulation layer thickness variations without requiring a completely complex multi-layer structure.
3Ease of manufacture
If the touch electrode layer is positioned uniformly across the display panel, then the manufacturing process is easier, but the optical characteristics and touch sensitivity cannot be optimized for different viewing angles
Solution Approach 1:
The patent applies local quality by positioning the touch electrode layer at different heights in different regions. The touch electrode layer is positioned at a third height in the central area and at a fourth height (higher than the third) in the peripheral area, corresponding to the black matrix positioning. This regional differentiation optimizes both optical characteristics and touch sensitivity for different viewing angles while maintaining a relatively simple manufacturing process.
Data Source
AI summary
A display apparatus includes a display panel in which a display area to display an image and a non-display area adjacent to the display area are defined, and in which a central area and a peripheral area in a periphery of the central area are defined in the display area, a touch sensor on the display panel, the touch sensor including a touch electrode layer, and a black matrix on the display panel. The black matrix includes a first black matrix in the central area and a second black matrix in the peripheral area. The second black matrix is on layer of the display panel that is higher than the first black matrix.