Transparent Touch Electrode Leads for Narrow Border OLED Panels
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Solution Overview
Problem
Existing organic light-emitting display panels face challenges in achieving a narrow border due to the large space occupation by touch electrode leads in the border region, which can lead to signal crosstalk and increased impedance.
Innovation Solution
The use of transparent conductive first leads, located in a different layer from the touch electrodes and connected through an insulation layer with through holes, allows for reduced space occupation in the border region by enabling direct placement of leads within the display region, thereby reducing the area required for touch electrode connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional metal leads are used to connect touch electrodes to the driving chip, then reliable electrical connection is achieved, but the border region area is excessively occupied
Solution Approach 1:
The patent transitions the lead structure from a planar two-dimensional layout to a three-dimensional stacked configuration. Multiple leads are arranged in different layers (first lead layer, second lead layer, third lead layer) and connected through vertical vias, effectively utilizing the third dimension (z-axis) to reduce the footprint in the border region while maintaining electrical connection reliability.
Solution Approach 2:
The patent implements a nested hierarchical structure where leads in lower layers are connected to leads in upper layers through vias. The first leads in the first lead layer connect to second leads in the second lead layer, which in turn connect to third leads in the third lead layer, creating a nested configuration that consolidates multiple connection paths into a compact vertical structure.
2Reliability
If lead width is increased to ensure reliable connection, then electrical connection reliability improves, but signal crosstalk increases
Solution Approach 1:
By moving lead connections to multiple vertical layers, the patent reduces the horizontal proximity between adjacent leads in the same layer. This spatial separation in the planar view minimizes capacitive coupling and signal crosstalk while maintaining adequate connection width in each layer for reliable electrical contact.
Solution Approach 2:
The patent divides the continuous lead path into segmented sections across different layers, with isolation layers (such as insulating layers and organic light-emitting layers) separating adjacent leads. This segmentation reduces electromagnetic interference and signal crosstalk between neighboring leads while preserving connection integrity through the layered structure.
3Ease of manufacture
If more space is allocated for lead connections, then manufacturing simplicity is maintained, but screen-to-body ratio decreases
Solution Approach 1:
The patent integrates lead connections into the multi-layer stack structure of the display panel, utilizing the vertical z-axis direction for lead routing. This approach incorporates the connection function within the existing layered manufacturing process without requiring additional lateral space, thereby improving screen-to-body ratio while maintaining manufacturing feasibility through standard thin-film deposition and patterning techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively minimizes the space occupied by touch electrode leads in the border region, facilitating a narrower border while maintaining touch performance by ensuring reliable electrical connections and reducing signal attenuation.
Implementation Method 1
an insulation layer disposed between a film layer where the plurality of first leads is located and a film layer where the plurality of touch electrodes is located
Data Source
AI summary
An organic light-emitting display panel and a display device are provided. The organic light-emitting display panel includes: a plurality of touch electrodes extending in a first direction and arranged in a second direction; and a plurality of first leads one-to-one corresponding to the plurality of touch electrodes. The first leads are made of a transparent conductive material. The first leads are located in a different layer from the touch electrodes. An insulation layer is disposed between the film layers where the first leads and the touch electrodes are located. Each first lead at least partially overlaps with a corresponding touch electrode in a direction perpendicular to a plane of the organic light-emitting display panel, and is electrically connected to the corresponding touch electrode through a through hole in the insulation layer. The first lead extends in the first direction and is arranged in the second direction.