Terminal Wiring Width Variation for LCD Contact Hole Precision
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Solution Overview
Problem
The challenge is to ensure reliable connection of terminals to an IC driver in liquid crystal displays with small wiring pitches due to reduced size and high resolution, while maintaining sufficient area for contact holes and micromachining precision.
Innovation Solution
A terminal structure is implemented with a first part having a contact hole and a transparent conductive film, and a second part without a contact hole, where the wiring width is wider in the first part and narrower in the second part, allowing adjacent wiring lines to be bent away, thus increasing the wiring interval for micromachining at smaller pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal pitch is reduced to support higher screen resolution and smaller display device dimensions, then the screen resolution is improved and device size is reduced, but the area available for contact holes and micromachining is insufficient
Solution Approach 1:
The terminal structure is divided into a first part containing the contact hole and transparent conductive film, and a second part without a contact hole. This segmentation allows the contact hole area to be concentrated in the first part while the second part provides additional space for micromachining and IC driver installation, effectively resolving the space conflict caused by reduced terminal pitch.
Solution Approach 2:
The terminal wiring line width is varied along its length, being wider in the first part and narrower in the second part. This dimensional variation in the wiring line structure creates additional space in the second part for micromachining operations and IC driver installation, while maintaining the necessary contact hole area in the first part.
2Length of stationary object
If the wiring pitch is reduced to support smaller display device dimensions, then the device size is reduced, but the micromachining precision becomes difficult to maintain
Solution Approach 1:
The terminal wiring line is designed with different widths in different regions: wider in the first part to accommodate the contact hole and maintain manufacturing precision, and narrower in the second part to reduce overall device dimensions. This local quality variation allows micromachining to be performed with adequate precision while achieving compact device size.
3Reliability
If the terminal area is increased to ensure reliable connection, then the connection reliability is improved, but the display device dimensions increase
Solution Approach 1:
The terminal wiring line width is dynamically adjusted along its length, being wider in the first part where connection reliability is critical and narrower in the second part where space efficiency is prioritized. This dynamic width variation ensures reliable connection while minimizing overall device dimensions.
Data Source
AI summary
A terminal includes a first part, which includes a terminal contact hole and an ITO film, and a second part, which includes the ITO film but not the contact hole. A terminal wiring line of the terminal is wide in the first part and narrow in the second part. In regions adjacent to the first part, adjacent terminal wiring lines are bent outward, thus securing enough interval between wiring lines, with the result that terminals can be formed through patterning by normal light exposure.