In-cell Touch Display Panel Sub-common Electrode 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 implementation of sub-common electrodes in adjacent pixel structures, electrically connected through a metal connection structure, which are spatially insulated from the pixel electrodes and data lines, allowing for separate routing and reduced overlap between data lines and touch sensing lines.
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 introduces a third dimension (vertical layering) to resolve the routing conflict. Data lines are routed in the first metal layer while touch sensing lines are routed in the second metal layer, allowing both signal types to coexist in the non-display area without interference. This dimensional separation eliminates the harmful overlap while maintaining functional integration.
Solution Approach 2:
The patent introduces insulation layers as intermediary elements between data lines and touch sensing lines. These insulation layers act as mediators that physically separate the two signal paths, preventing direct electrical interference while allowing both lines to be present in the same geographic area (non-display region).
2Reliability
If sub-common electrodes are electrically connected to pixel electrodes, then touch sensing function is enabled, but overlap with data lines causes signal interference
Solution Approach 1:
The sub-common electrodes are positioned in the second metal layer, which is vertically separated from the data lines in the first metal layer. This dimensional arrangement allows the sub-common electrodes to maintain electrical connection with pixel electrodes for touch sensing while avoiding spatial overlap and signal interference with data lines.
3Object-affected harmful factors
If data lines and touch sensing lines are separated into different metal layers, then signal interference is reduced, but device structure becomes more complex
Solution Approach 1:
The second metal layer serves multiple functions: it carries touch sensing lines for touch detection and also provides sub-common electrodes for capacitive sensing. This multi-functionality reduces the need for additional dedicated structures, thereby limiting the increase in device complexity despite the multi-layer architecture.
Data Source
AI summary
The in-cell touch display panel includes the following units. Multiple pixel regions are disposed in areas of the display area enclosed by gate lines that are intersected the data lines, in which each pixel region includes a pixel structure, and each pixel structure includes a pixel electrode. A common electrode includes multiple touch electrodes, in which each touch electrode corresponds to more than one pixel electrodes. A sub-common electrode is a portion of the touch electrode. The data lines and the sub-common electrodes are disposed on the same insulation layer. A metal connection structures is electrically connected to two adjacent ones of the sub-common electrodes along the second direction. The metal connection structure and the data lines are formed by different metal layers.