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 touch and display functions.
Innovation Solution
The design separates data lines and touch sensing lines by forming them in different metal layers or orientations in the display area, ensuring they do not overlap in the non-display area, allowing for improved routing and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data lines and touch sensing lines are concentrated toward the chip area in the non-display area, then both display and touch functions can be controlled by a single TDDI chip, but the data lines and touch sensing lines overlap with each other causing signal interference
Solution Approach 1:
The patent applies dimensionality change by routing data lines and touch sensing lines in different spatial dimensions. Specifically, data lines are routed along the first direction (e.g., horizontal) while touch sensing lines are routed along the second direction (e.g., vertical) in the non-display area, preventing their overlap. This orthogonal routing strategy in different directions resolves the signal interference problem while maintaining single-chip control of both display and touch functions.
Solution Approach 2:
The patent segments the routing paths for data lines and touch sensing lines into separate directional channels. Data lines are confined to extend primarily in the first direction, while touch sensing lines extend primarily in the second direction. This segmentation of routing paths ensures that the two types of lines do not concentrate and overlap in the same region, thereby eliminating signal interference while preserving the integrated TDDI chip control architecture.
2Object-affected harmful factors
If data lines and touch sensing lines are routed separately in different directions, then signal interference is reduced, but the routing complexity in the non-display area increases
Solution Approach 1:
The patent applies local quality by implementing direction-specific routing rules in different regions. In the non-display area, data lines are restricted to the first direction while touch sensing lines are restricted to the second direction. This localized routing strategy simplifies the overall routing complexity by providing clear directional guidelines for each line type, making the routing process more manageable despite the increased spatial separation requirements.
Data Source
AI summary
The in-cell touch display panel has a display area and a non-display area. Display IC bounding pads and touch pads are disposed in the non-display area. A touch electrode corresponds to more than one pixel structures. A touch sensing line is electrically connected to the touch electrode and one of the touch pads. A data line is electrically connected to a thin film transistor and one of the display pads. At least one of the display pads is disposed between two of the touch pads, and at least one of the touch pads is disposed between two of the display pads.