Display Device Terminal Overlap for Narrow Line Spacing
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Solution Overview
Problem
Conventional display devices face challenges in narrowing the distance between neighboring line layers while increasing the area of terminals connected to bump electrodes, as existing methods either widen the distance between line layers or reduce the terminal area, leading to insufficient electrical connection due to displacement of bump electrodes.
Innovation Solution
A display device configuration that includes a substrate with insulation films covering line layers, contact holes, and terminals connected via these films, allowing bump electrodes to overlap line layers and maintain a narrow distance between them, thereby increasing terminal area without compromising electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between neighboring line layers is narrowed to increase pixel density, then the number of pixels per unit area increases, but the terminal area becomes insufficient to ensure reliable electrical connection with bump electrodes
Solution Approach 1:
The terminal is configured to overlap multiple line layers in the planar view, transitioning from a one-dimensional connection (single line layer) to a multi-dimensional structure that spans across multiple line layers vertically while maintaining compact horizontal footprint. This allows the terminal area to remain sufficient for reliable bump electrode connection even when the horizontal distance between line layers is narrowed.
Solution Approach 2:
The terminal integrates multiple functions by simultaneously connecting to multiple line layers (first line layer and second line layer) through a single terminal structure. This merging of connection points allows the terminal to maintain adequate area for electrical connection while the line layers are positioned closer together horizontally.
2Reliability
If the terminal area is increased to ensure sufficient electrical connection with bump electrodes, then connection reliability improves, but the distance between neighboring line layers must be increased
Solution Approach 1:
Instead of increasing terminal area by expanding horizontally (which would require larger spacing between line layers), the terminal extends vertically to overlap multiple line layers. This dimensional transition allows sufficient connection area to be achieved without increasing the horizontal pitch between line layers, thereby maintaining high pixel density.
Solution Approach 2:
The terminal structure exhibits different spatial characteristics in different dimensions: it has a compact horizontal footprint to accommodate narrow line layer spacing, while extending vertically to provide sufficient connection area for reliable electrical contact with bump electrodes.
3Reliability
If terminals are arranged in a staggered pattern to increase terminal area, then electrical connection area improves, but the distance between line layers must be increased
Solution Approach 1:
The terminal overlaps multiple line layers in the vertical direction rather than arranging terminals in a staggered horizontal pattern. This vertical stacking approach increases connection area without requiring increased horizontal spacing between line layers, avoiding the need to increase the distance between neighboring line layers.
Data Source
AI summary
The present invention provides a display device which, in a region on which a semiconductor chip is mounted, can narrow the distance between neighboring line layers and, at the same time, can increase an area of terminals which are connected with bump electrodes of the semiconductor chip. In a display device which includes a substrate having a display part and a peripheral portion, and a semiconductor chip which is mounted on the peripheral portion of the substrate, the semiconductor chip includes a first bump electrode, the substrate includes a first line, a second line which is arranged adjacent to the first line, an insulation film which covers the first line and the second line, a first contact hole which is formed in the insulation film, and a first terminal which is connected to the first line via the first contact hole, the first bump electrode is connected with the first terminal, the second line is electrically insulated from the first terminal, and the first terminal is arranged to overlap the second line by way of the insulation film as viewed in a plan view.