Touch Display Panel Common Electrode Integration
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Solution Overview
Problem
The integration of touch devices into display panels is complex and costly, particularly in in-cell/on-cell touch display panels, which require additional conductive layers, increasing manufacturing complexity and cost.
Innovation Solution
A touch display panel design that integrates touch devices without an additional conductive layer by using a plurality of pixels, sensing line segments, and an insulating layer, where the sensing lines are formed by connecting electrodes and the insulating layer, allowing direct sensing without active devices on the sensing lines, thereby reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional conductive layer is added to integrate touch devices into a display panel, then the touch sensing function is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The common electrode layer serves dual functions: as the common electrode for display operation and as the sensing electrode for touch detection. This multi-functionality eliminates the need for separate sensing electrode layers, reducing structural complexity while maintaining touch sensing capability
Solution Approach 2:
The patent combines the common electrode and sensing electrode into a single layer, and merges the sensing line fabrication with the existing display electrode fabrication processes. This consolidation reduces the number of manufacturing steps and material layers while achieving both display and touch functions
2Reliability
If an additional conductive layer is added to integrate touch devices into a display panel, then the touch sensing function is improved, but the manufacturing cost increases
Solution Approach 1:
The common electrode layer serves dual functions: as the common electrode for display operation and as the sensing electrode for touch detection. This multi-functionality eliminates the need for separate sensing electrode layers, reducing structural complexity while maintaining touch sensing capability
Solution Approach 2:
The patent combines the common electrode and sensing electrode into a single layer, and merges the sensing line fabrication with the existing display electrode fabrication processes. This consolidation reduces the number of manufacturing steps and material layers while achieving both display and touch functions
3Reliability
If active devices are placed on sensing lines, then the sensing function is improved, but signal interference with active devices occurs
Solution Approach 1:
The sensing lines are segmented into multiple sections with different connection configurations. Some segments connect to the common electrode while others remain isolated, allowing the sensing function to be distributed without requiring continuous active devices along the entire sensing line, thereby reducing interference
Solution Approach 2:
The common electrode acts as an intermediary element that receives sensing signals from multiple sensing lines. This mediator approach allows sensing functionality to be achieved through the common electrode rather than requiring active devices directly on each sensing line, reducing signal interference
Data Source
AI summary
A touch display panel includes pixels, a first sensing line segment, a first connecting electrode and an insulating layer. The pixels are divided into a first group and a second group, and the first group includes a first region and a second region. Each pixel includes an active device, a pixel electrode and a common electrode. The first sensing line segment is disposed in a portion of the pixels of the first region. The insulating layer includes at least one first opening be adapted to expose a portion of the first sensing line segment or a portion of the first connecting electrode, and the first connecting electrode is connected to the portion of the first sensing line segment via the first opening to form a first sensing line. The common electrode at the first region is connected to the first connecting electrode, the common electrode at the second region is connected to the common electrode at the first region to form a first sensing electrode, and the common electrode at the second region is not directly connected to the first connecting electrode.