Oblique Power Line Layout Between Pixels for White Angle Control
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Solution Overview
Problem
Wiring lines overlapping display elements in display devices cause surface non-uniformity and white angle dependency due to step differences, leading to view angle-dependent issues.
Innovation Solution
The display device incorporates a power line design with first and second conductive lines that intersect obliquely to data or scan lines, arranged between adjacent light emitting elements, and includes a multi-layered interlayer insulating structure to minimize overlap and surface non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring lines are disposed behind the display element, then electrical connection is achieved, but surface non-uniformity and white angle dependency occur due to step differences
Solution Approach 1:
The patent extracts the harmful overlap between wiring lines and display elements by positioning the wiring lines exclusively in the peripheral region, separating them from the pixel region where display elements are located. This eliminates the step difference problem while maintaining electrical connection functionality through extended wiring lines that reach from the peripheral region to connect with display elements.
Solution Approach 2:
The patent transitions from a two-dimensional overlap arrangement to a three-dimensional spatial separation by utilizing the peripheral region around the pixel array. The wiring lines are arranged in a different spatial zone (peripheral region vs. pixel region), effectively removing them from the problematic overlap area while maintaining functional connectivity.
2Reliability
If wiring lines overlap display elements, then electrical connection is established, but view angle dependency deteriorates due to step differences
Solution Approach 1:
The patent removes the wiring lines from the pixel region where they would cause view angle dependency, placing them instead in the peripheral region. This extraction eliminates the source of the problem while preserving the electrical connection function through properly designed connection paths.
3Object-affected harmful factors
If power lines are arranged between adjacent light emitting elements, then display quality improves by reducing overlap, but manufacturing complexity increases due to multi-layered interlayer insulating structure
Solution Approach 1:
The patent segments the wiring structure into multiple functional layers with distinct roles: interlayer insulating layers for electrical isolation, contact holes for vertical connections, and conductive lines for power transmission. This segmentation allows each layer to be optimized independently while working together to achieve the overall goal of reducing overlap and maintaining electrical functionality.
Solution Approach 2:
The interlayer insulating layers serve as intermediary structures that mediate between the need for electrical isolation and the need for vertical connections. Contact holes act as intermediaries to pass signals through the insulating layers, enabling the multi-layer structure to achieve both isolation and connectivity requirements.
Data Source
AI summary
A display device includes a substrate including a pixel region and a peripheral region. A plurality of pixels is disposed in the pixel region of the substrate. Each of the plurality of pixels includes a light emitting element. Data lines and scan lines are connected to each of the plurality of pixels. A power line is configured to supply power to the plurality of pixels. The power line includes a plurality of first conductive lines and a plurality of second conductive lines intersecting the plurality of first conductive lines. The plurality of second conductive lines is arranged in a region between adjacent light emitting elements of the plurality of pixels. At least some of the plurality of second conductive lines extend in a direction oblique to a direction of extension of the data lines or the scan lines.