In-Cell Touch Display Panel Sensing Line Layout
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Solution Overview
Problem
In in-cell touch display panels, the disposition of sensing lines relative to data lines poses challenges in terms of overlap and efficient touch and display functionality, particularly in the integration of touch and display driver components.
Innovation Solution
The implementation of a design where multiple gate lines and data lines intersect on a substrate, with sensing lines disposed among pixel regions, and a touch electrode formed by a second transparent conductive layer electrically connected to sensing lines through insulation layers, allowing for efficient touch detection without overlapping with data lines, and utilizing a metal connection structure between the touch electrode and sensing lines to prevent under-cut situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensing lines are disposed to intersect with data lines, then the layout is simplified, but overlap occurs between data and sensing lines causing interference
Solution Approach 1:
The patent separates sensing lines and data lines into different vertical layers (first metal layer and second metal layer) to eliminate horizontal overlap interference. This multi-layer spatial arrangement allows both line types to coexist without intersecting in the same plane, resolving the contradiction between simplified layout and interference prevention.
2Device complexity
If touch electrode is directly connected to sensing line without insulation layers, then connection is simplified, but under-cut situations occur compromising the touch electrode
Solution Approach 1:
The patent forms insulation layers and opening structures before connecting the touch electrode to the sensing line. This preliminary preparation of the connection path prevents under-cut issues by ensuring proper structural support and alignment are established prior to electrode formation, thereby maintaining touch electrode integrity.
3Reliability
If multiple insulation layers with openings are used to connect touch electrode to sensing line, then under-cut is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent divides the connection structure into multiple segmented insulation layers (first insulation layer, second insulation layer) with corresponding openings. This segmentation allows each layer to be formed and patterned independently, enabling precise control over the connection geometry and preventing under-cut while maintaining manufacturability through modular fabrication steps.
Data Source
AI summary
An in-cell touch display panel includes a sensing line. A touch electrode corresponds to more than one pixel electrodes. A first insulation layer is formed on the sensing line and has a first opening to expose the sensing line. A gate of a thin film transistor (TFT) is formed on the first insulation layer. A second insulation layer is formed on a gate line and has a second opening corresponding to the first opening. A source of the TFT is formed on the second insulation layer. A third insulation layer is formed on the source and has a third opening corresponding to the second opening. The touch electrode is formed on the third insulation layer and electrically connected to the sensing line through the third opening, the second opening, and the first opening.