Display Device Lead Wiring Superposition for Luminance Uniformity
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Solution Overview
Problem
Existing display technologies face challenges in achieving uniform luminance for display regions with irregular shapes, leading to luminance unevenness.
Innovation Solution
A display device with a non-rectangular display region and a surrounding frame region, featuring data signal lines, control lines, subpixel circuits, and lead wiring lines in different metal layers, where the lead wiring lines are superposed through an inorganic insulating film to manage capacitance and reduce luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lead wiring lines are arranged in a single metal layer for display regions with irregular shapes, then the device complexity is reduced, but luminance unevenness occurs due to capacitance differences
Solution Approach 1:
The patent transitions from a single-plane wiring arrangement to a multi-layer three-dimensional wiring structure. Lead wiring lines are arranged in different metal layers (first lead wiring line in one layer, second lead wiring line in another layer) and superposed on each other through an inorganic insulating film. This spatial arrangement in multiple dimensions reduces capacitance differences between lead wiring lines while maintaining manageable device complexity.
2Illumination intensity
If lead wiring lines are superposed in different metal layers to reduce capacitance differences, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The wiring structure is segmented into multiple metal layers, with lead wiring lines placed in different layers. The first lead wiring line is provided in a first metal layer, and the second lead wiring line is provided in a second metal layer. This segmentation allows independent routing and capacitance optimization for each lead wiring line while maintaining overall structural organization.
Solution Approach 2:
An inorganic insulating film is introduced as an intermediary between the first and second metal layers. This insulating film enables the superposition of lead wiring lines from different metal layers while providing necessary electrical isolation, thus achieving capacitance balance without direct contact between conductive lines.
3Adaptability or versatility
If the display region has a non-rectangular shape to meet design requirements, then adaptability is improved, but luminance unevenness occurs due to irregular signal distribution
Solution Approach 1:
The patent applies different wiring configurations to different regions of the display. Lead wiring lines are specifically arranged in multiple metal layers and superposed in regions where capacitance differences occur due to the irregular shape. This localized optimization maintains luminance uniformity in critical areas while preserving the overall non-rectangular display shape for design flexibility.
Data Source
AI summary
One of a plurality of data signal lines or one of a plurality of control lines that is electrically coupled to a first lead wiring line, and another one of the plurality of data signal lines or another one of the plurality of control lines that is electrically coupled to a second lead wiring line are adjacent to each other. The first lead wiring line is provided in a first metal layer. The second lead wiring line is provided in a second metal layer being a layer different from the first metal layer. The first lead wiring line and the second lead wiring line are superposed on one another through intermediation of an inorganic insulating film.