Display Device Opening Portion Width Variation
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Solution Overview
Problem
In display devices using thin film transistors, forming an opening portion in the scanning signal line where it intersects with the video signal line makes it difficult to correct short-circuits and ensure spatial tolerance for cutting off connecting lines, leading to limitations in high-resolution display due to increased electric resistance and reduced pixel area.
Innovation Solution
The display device features a scanning signal line with an opening portion that overlaps with the video signal line, where the connecting line branches from the video signal line and extends outside, forming a projecting shape to ensure a wider opening portion width intersects the connecting line, allowing for effective cutting and maintaining spatial tolerance during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If an opening portion is formed in the scanning signal line at the intersection with the video signal line, then it is possible to cut off short-circuited portions for repair, but the opening portion reduces the effective area and increases electric resistance of the scanning signal line
Solution Approach 1:
The opening portion is designed with non-uniform width along the scanning signal line. The width is larger at specific locations (first and second regions) and smaller at intermediate portions, creating local variations in the opening characteristics. This allows the opening to provide sufficient space for repair operations at critical locations while minimizing the overall impact on the scanning signal line's electrical properties.
2Ease of repair
If the opening portion width is increased to ensure spatial tolerance for cutting operations, then repair operations can be performed reliably, but the pixel area is reduced and high-resolution display is limited
Solution Approach 1:
The opening portion employs a non-uniform width design where larger width regions are strategically positioned at the first and second regions to provide adequate spatial tolerance for cutting operations. The intermediate portions have smaller widths that minimize the impact on pixel area. This local variation in opening width allows repair operations to be performed reliably at critical locations while maintaining high pixel density for high-resolution display.
3Manufacturing precision
If the semiconductor layer is formed to cover a larger region than the conductor layer, then manufacturing precision is improved, but the semiconductor layer may cover critical areas within the opening portion making repair difficult
Solution Approach 1:
The opening portion's non-uniform width creates regions with different characteristics. The first and second regions have larger widths that ensure they remain uncovered by the semiconductor layer, maintaining accessibility for repair operations. The intermediate portions have smaller widths that can be covered by the semiconductor layer, providing manufacturing precision benefits. This spatially varying opening design allows the semiconductor layer to cover critical areas in some regions while leaving repair-accessible regions open.
Data Source
AI summary
A display device which surely allows the black-spot-forming correction at the time of forming an opening portion in a portion of a scanning signal line where a scanning signal line and a video signal line intersects each other and forming a semiconductor layer and a conductor layer by a resist flow method is provided. A scanning signal line which forms an opening portion in a portion thereof which intersects a video signal line, an insulation film, a semiconductor layer which covers a region which spreads larger than a conductor layer, and the conductor layer are sequentially stacked. The conductor layer includes the video signal line, a drain electrode and a source electrode of a thin film transistor, and a connecting line which connects the video signal line and the drain electrode. The connecting line is branched from the video signal line over the opening portion, and the opening portions is formed in a projecting manner toward both edges of the scanning signal line such that a width of the opening portion in the direction which intersects the connecting line is set larger than a width of the semiconductor layer.