In-cell Touch Display Panel Non-display Area Routing
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Solution Overview
Problem
In in-cell touch display panels, the overlap of data lines and touch sensing lines in the non-display area leads to signal interference, affecting both display and touch functions.
Innovation Solution
The design includes a configuration where data lines and touch sensing lines are not overlapped in the non-display area, with a specific arrangement of gate lines, data lines, and touch sensing lines on a substrate, and the use of insulation layers to prevent interference, allowing for separate routing and connection structures that keep the lines parallel in the display area and interleaved in the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data lines and touch sensing lines are routed through the non-display area, then both display and touch functions can be implemented, but signal interference occurs due to line overlap
Solution Approach 1:
The patent transitions from planar routing to three-dimensional routing by utilizing multiple layers. Data lines are routed on the first substrate while touch sensing lines are routed on a second substrate positioned at a different height, separated by insulation layers. This vertical separation in the Z-dimension eliminates signal interference while maintaining both display and touch functionality through the same non-display area.
Solution Approach 2:
Insulation layers are introduced as intermediary structures between the data lines on the first substrate and the touch sensing lines on the second substrate. These insulation layers act as mediators that physically separate the two types of conductive lines, preventing direct contact and electromagnetic interference while allowing both lines to coexist in the non-display area.
2Reliability
If data lines and touch sensing lines are separated in the non-display area, then signal interference is prevented, but the device structure becomes more complex
Solution Approach 1:
Instead of implementing complex lateral separation within the same plane, the patent utilizes the vertical dimension by stacking two substrates at different heights. This approach simplifies the routing design compared to traditional planar separation methods, as the insulation layers naturally provide separation without requiring complex routing patterns or additional lateral space.
Solution Approach 2:
The patent combines the routing of both data lines and touch sensing lines through the same non-display area by utilizing different layers. This merging of routing paths in the vertical dimension reduces the overall device footprint and simplifies the edge connector design, as both types of lines can exit through the same boundary region without requiring separate lateral pathways.
Data Source
AI summary
The in-cell touch display panel has a display area and a non-display area. Multiple pixel structures are disposed in the display area. Transparent conductive layers, metal layers, and first to fourth insulation layers are disposed in the pixel structures. The thickness of the third insulation layer is greater than or equal to that of the second insulation layer. The thickness of the third insulation layer is 1.2 or more times of that of the fourth insulation layer. The thickness of the third insulation layer is greater than or equal to 5000 Å. The sum of the thickness of the third insulation layer and the thickness of the fourth insulation layer is greater than or equal to 7000 Å.