Display Panel Touch Interconnect Across Layer Height Differences
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Solution Overview
Problem
The existing display panel technology faces challenges in establishing an electric connection between the touch wiring and the metal wiring layer due to height differences caused by stacked functional film layers and the cover plate, making it difficult to connect them effectively.
Innovation Solution
A conductive structure is introduced between the metal wiring layer and the touch layer, comprising insulation and conductive layers that are alternately stacked, allowing the touch leads to be electrically connected to the metal wiring layer, thereby overcoming the height difference and simplifying the processing steps by omitting the need for a flexible circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple functional film layers and cover plate are stacked to achieve display functionality, then the display performance is improved, but a height difference is generated between the touch layer and metal wiring layer making electrical connection difficult
Solution Approach 1:
The patent introduces a conductive layer that extends in three dimensions from the metal wiring layer through the stacked functional film layers to reach the touch layer. This vertical extension in the Z-dimension allows electrical connection across multiple layers without requiring external flexible circuit boards, resolving the height difference problem created by layer stacking.
Solution Approach 2:
The conductive layer acts as an intermediary element between the metal wiring layer and the touch layer. It bridges the gap created by the stacked functional film layers and cover plate, enabling electrical connection while maintaining the integrity of all intermediate layers.
2Reliability
If traditional connection methods using flexible circuit boards are used to connect touch wiring and metal wiring layer, then electrical connection can be achieved, but the device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the connection function into the internal structure of the display panel by integrating the conductive layer within the stacked layers. This eliminates the need for separate flexible circuit boards and external connection mechanisms, reducing device complexity while maintaining reliable electrical connection.
Solution Approach 2:
The conductive layer serves multiple functions: it provides electrical connection between layers, maintains structural integrity across the stack, and enables signal transmission without requiring additional external components. This multi-functionality reduces overall device complexity.
Data Source
AI summary
A display panel defines a display region and a non-display region located around the display region, and includes: an array layer disposed in the display region and the non-display region; a metal wiring layer disposed in part of the array layer located in the non-display region; a touch control layer, which is arranged on the side of the metal wiring layer away from the array layer and comprises a plurality of touch leads, the plurality of touch leads extending from the display region to the non-display region; a plurality of functional film layers located between the array layer and the touch control layer and located in the display region; and a conductive structure located between the metal wiring layer and the touch control layer, the plurality of touch leads being electrically connected to the metal wiring layer by the conductive structure.