Touch Display Dam Height Variation Prevents Routing Short Circuits
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Solution Overview
Problem
Touch screen manufacturing often results in short circuits between neighboring routing lines, which is a significant technical challenge that existing technologies have not adequately addressed.
Innovation Solution
A touch display device is designed with dams that form a boundary around the encapsulation unit, where the dam height differs in regions overlapping and not overlapping the routing lines, preventing short circuits by reducing the depth of the valley between the dams and controlling the spread of the organic encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform height dams are used to prevent organic encapsulation layer spread, then encapsulation reliability is improved, but short circuits between routing lines occur due to excessive valley depth
Solution Approach 1:
The patent applies local quality by varying the dam height according to location: higher dams in non-routing regions to prevent organic encapsulation layer spread, and lower dams in routing line regions to avoid creating deep valleys that cause short circuits. This spatially differentiated dam structure resolves the contradiction between encapsulation reliability and short circuit prevention.
Solution Approach 2:
The dam structure is segmented into multiple height levels corresponding to different functional zones. The dam is divided into a first dam portion facing routing lines with lower height, and a second dam portion in other regions with higher height, allowing each segment to serve its specific purpose without causing harmful effects.
2Manufacturing precision
If higher dams are used to prevent organic encapsulation layer spread to pad areas, then manufacturing precision is improved, but the risk of short circuit between routing lines increases
Solution Approach 1:
The dam structure implements local quality by providing different heights in different locations: higher dams where organic encapsulation layer containment is critical (non-routing areas), and lower dams where routing lines are present to prevent short circuits. This resolves the contradiction between manufacturing precision and short circuit prevention.
Data Source
AI summary
A touch display device for preventing the occurrence of a short circuit between routing lines is disclosed. The touch display device includes a dam forming a boundary with an encapsulation unit covering a light-emitting element, and the dam is formed such that the height thereof in a region that overlaps routing lines, which are connected to touch electrodes disposed on the encapsulation unit, and the height thereof in a region that does not overlap the routing lines are different from each other, thereby preventing the occurrence of a short circuit between the routing lines.