Touch Window Dummy Part Wire Pattern Filling
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Solution Overview
Problem
Existing methods for forming metallic wiring patterns in flat panel displays, such as LCDs, face challenges in precision and uniformity due to complex photolithography processes and filling failures, particularly when using a squeegee-based filling scheme.
Innovation Solution
Incorporating a dummy part within the wire pattern on a touch window substrate, which serves as a directional guide for the squeegee and increases the filling time of metallic material, preventing disconnection and improving pattern precision and electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography scheme is used to form wiring patterns, then pattern formation capability is improved, but process complexity increases due to multiple steps (laminating, exposing, developing)
Solution Approach 1:
The patent extracts and eliminates the complex photolithography steps (laminating, exposing, developing) by replacing them with a direct printing scheme that forms wiring patterns without requiring photoresist processing, thereby reducing process complexity while maintaining pattern formation capability
Solution Approach 2:
The patent replaces the mechanical and chemical photolithography process with a printing-based approach that directly deposits conductive material to form wiring patterns, substituting a simpler mechanical printing system for the complex photolithography system
2Productivity
If squeegee-based filling scheme is used to fill metallic material in wire pattern, then filling efficiency is improved, but squeegee may be dropped into the pattern causing process failure
Solution Approach 1:
The patent incorporates a dummy part in the wire pattern that acts as a buffer or cushion zone, preventing the squeegee from being dropped into the actual wiring pattern. This beforehand cushioning structure absorbs the impact and prevents process failure while maintaining efficient filling
Solution Approach 2:
The dummy part serves as an intermediary element between the squeegee and the functional wire pattern, mediating the interaction by providing a sacrificial zone that protects the actual wiring from damage during the filling process
3Manufacturing precision
If wire pattern is perpendicular to squeegee movement direction for filling, then filling uniformity is improved, but filling time is insufficient leading to disconnection
Solution Approach 1:
The patent segments the wire pattern into multiple sections by introducing dummy parts that divide the continuous wire into segments. This segmentation increases the total filling time by creating multiple filling zones while maintaining uniform filling in each segment, preventing disconnection issues
4Manufacturing precision
If additional cutting work of substrate is performed to optimize wire pattern orientation, then filling uniformity is improved, but material efficiency decreases and productivity reduces
Solution Approach 1:
The patent solves the orientation problem by using the dummy part structure to change the dimensional arrangement of the wire pattern, allowing optimal filling orientation without requiring substrate cutting. The dummy parts create the necessary geometric configuration in the pattern design itself rather than through substrate modification
Data Source
AI summary
Disclosed is a touch window. The touch window includes a substrate, a sensing electrode on the substrate, and a wire to electrically connect the sensing electrode, and a dummy part is provided in the wire. The touch window includes a substrate, a sensing electrode on the substrate, and a wire to electrically connect the sensing electrode. The wire includes a first wire part and a second wire part adjacent to the first wire part, and the first wire part has a directionality different from a directionality of the second wire part.