Input Sensing Panel with Composite Conductive Lines
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Solution Overview
Problem
Display devices face durability issues due to disconnection of sensing lines in input sensing panels, particularly when metal lines corrode or oxidize, leading to signal transmission failures.
Innovation Solution
The input sensing panel incorporates a transparent conductive line made of indium tin oxide and a metal line made of molybdenum, with contact holes that expose the transparent conductive line, allowing for electrical connection even if the metal line corrodes or oxidizes, and are arranged to minimize layer separation defects by controlling the size and distribution of contact holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal line is used in the sensing line, then electrical conductivity is improved, but durability deteriorates due to corrosion and oxidation
Solution Approach 1:
The sensing line is constructed as a composite structure with a transparent conductive line (indium tin oxide) as the base layer and a metal line (molybdenum) as the upper layer. This composite design combines the corrosion resistance of the transparent conductive material with the high conductivity of metal, allowing the metal line to provide electrical connectivity while the transparent conductive line protects against corrosion and oxidation.
Solution Approach 2:
The transparent conductive line acts as an intermediary protective layer between the metal line and the corrosive environment. It serves as a barrier that prevents direct contact between the metal and corrosive substances, thereby extending the service life of the sensing line while maintaining electrical conductivity through the contact holes.
2Reliability
If contact holes are made larger to ensure electrical connection, then reliability is improved, but layer separation defects increase
Solution Approach 1:
The patent specifies precise parameter ranges for contact holes: size between 4-40 micrometers and specific arrangement patterns. These optimized parameters ensure sufficient electrical connection reliability while controlling the contact area to prevent excessive layer separation. The metal line width is set to be equal to or greater than the transparent conductive line width, further optimizing the connection geometry.
Solution Approach 2:
The contact holes are strategically positioned only in specific regions where electrical connection is needed, rather than uniformly distributed. Some contact holes are arranged in the widthwise direction of the transparent conductive line, creating localized connection points that provide reliable electrical contact while minimizing overall layer separation area.
Data Source
AI summary
A display device includes a display panel and an input sensing panel which includes sensing electrodes disposed on the display panel and which sense an input, sensing lines electrically connected to the sensing electrodes and which include a transparent conductive line disposed on the display panel and a metal line disposed on the transparent conductive line, and an insulating layer disposed between the transparent conductive line and the metal line. A plurality of contact holes are formed which penetrate through the insulating layer and expose the transparent conductive line, and some of the plurality of contact holes are arranged in a widthwise direction of the transparent conductive line.