Display Data Line Layout With Auxiliary Paths for Voltage Drop
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Solution Overview
Problem
Existing display apparatuses face issues with voltage drops during data signal transmission, leading to defects and inconsistent brightness in high-resolution displays, particularly due to increased electrical resistance in narrow data and driving voltage lines.
Innovation Solution
The display apparatus incorporates a design with auxiliary data lines and shielding layers connected directly to connection electrodes through contact holes in multiple insulating layers, reducing electrical resistance and preventing voltage drops by increasing the total area of signal transmission lines and using a planarization layer to fill grooves in the insulating layers, which helps in crack propagation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the data line width is reduced to increase resolution, then the display resolution is improved, but the electrical resistance increases causing voltage drops and defects
Solution Approach 1:
The data transmission path is segmented into multiple parallel conductive paths: the original data line and the auxiliary data line. By dividing the single narrow data line into multiple wider parallel lines, the total conductive area increases, reducing electrical resistance while maintaining the same pixel addressing capability. This segmentation allows high resolution to be maintained while improving voltage stability.
Solution Approach 2:
Multiple conductive functions are merged into the auxiliary data line structure. The auxiliary data line not only provides an alternative transmission path but also serves as a voltage compensation path and is electrically connected to the data line through contact holes, creating a combined system that addresses resistance issues without compromising resolution.
2Reliability
If multiple insulating layers are added to connect auxiliary data lines, then voltage stability is improved, but the device complexity increases
Solution Approach 1:
The auxiliary data line and its connecting contact holes serve multiple functions simultaneously: providing voltage compensation, creating electrical connection between data line and auxiliary data line, and enabling the planarization layer to fill grooves for crack propagation control. This multi-functionality reduces the need for separate dedicated structures, offsetting the complexity increase with functional consolidation.
3Reliability
If the auxiliary data line is added to reduce electrical resistance, then the voltage drop is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The auxiliary data line is formed in the first conductive layer before subsequent insulating and connection layers are added. The groove filling with planarization layer is performed as a preliminary step to control crack propagation before final assembly. These preliminary actions integrate the voltage stabilization function into the base structure, making subsequent manufacturing steps more straightforward despite the added complexity of the auxiliary line itself.
Data Source
AI summary
A display apparatus for displaying a high-resolution image and having a low occurrence rate of defects caused by a voltage drop. The display apparatus includes a substrate, a first conductive layer arranged on the substrate and including an auxiliary data line extending in a first direction, a first semiconductor layer arranged on the first conductive layer, a first gate layer arranged on the first semiconductor layer, a first connection electrode layer arranged on the first gate layer and including a first connection electrode electrically connected to the first semiconductor layer and the auxiliary data line, and a second connection electrode layer arranged on the first connection electrode layer and including a data line electrically connected to the first connection electrode.