Touch Sensing Line Formation in Self-In-Cell Display Panels
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Solution Overview
Problem
Self-in-cell touch display panels require an extra metal layer for touch sensing lines, increasing manufacturing costs and reducing the aperture ratio of the display device.
Innovation Solution
The touch signal lines are formed in patterned metal layers, with the first and second signal lines arranged orthogonally, allowing the second segment to cross over and connect with the first segments, reducing the need for an extra metal layer and minimizing the aperture ratio reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extra metal layer is added to form touch sensing lines, then the touch sensing function is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the touch sensing line function with the existing first and second signal line layers. The touch sensing line is formed by connecting segments from the first signal line layer and the second signal line layer, merging multiple functional layers into a unified structure that achieves both display and touch sensing functions without adding extra metal layers.
Solution Approach 2:
The first and second signal line layers serve dual purposes: they function as signal transmission lines for display operations and simultaneously form the touch sensing line for touch detection. This multi-functionality eliminates the need for dedicated separate touch sensing layers, reducing manufacturing complexity and cost.
2Reliability
If an extra metal layer is added to form touch sensing lines, then the touch sensing function is achieved, but the aperture ratio is reduced
Solution Approach 1:
The touch sensing line is merged with the existing signal line patterns in the first and second metal layers. By utilizing the space between and within the existing signal line structures, the touch sensing function is achieved without requiring additional metal layers that would occupy pixel area and reduce the aperture ratio.
Solution Approach 2:
The touch sensing line is formed by connecting segments across different metal layers (first and second signal line layers) in the vertical dimension. This three-dimensional arrangement allows the touch sensing function to be achieved without expanding the horizontal footprint within the pixel area, thereby preserving the aperture ratio.
3Ease of manufacture
If touch sensing lines are disposed parallel with data lines in the same metal layer, then the extra metal layer is saved, but the aperture ratio is significantly reduced
Solution Approach 1:
Instead of disposing touch sensing lines parallel to data lines in the same metal layer (two-dimensional planar arrangement), the patent forms the touch sensing line by connecting segments vertically across the first and second signal line layers. This three-dimensional arrangement saves the extra metal layer while minimizing the impact on aperture ratio by utilizing the vertical stacking space.
Solution Approach 2:
The touch sensing line is segmented into multiple segments distributed across the first and second signal line layers. These segments are connected through vertical connections, allowing the touch sensing function to be achieved in a distributed manner that minimizes local density increases and preserves the aperture ratio while eliminating the need for a dedicated touch sensing metal layer.
Data Source
AI summary
A touch display panel includes a first patterned metal layer and a second patterned metal layer. The first patterned metal layer includes a first signal line and one or more first segments. The second patterned metal layer is disposed above the first patterned metal layer and includes a second signal line and one or more second segments, wherein the one or more second segments are electrically connected to the one or more first segments such that the one or more first segments and the one or more second segments collectively form at least a part of a touch sensing line.