In-cell Touch Display Panel with Matrix-arranged Electrodes
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Solution Overview
Problem
Current large-size display panels with in-cell touch technology face challenges in achieving good touch performance at a low cost, as existing methods are complex and costly, and the touch leads often overlap with pixel electrodes, leading to increased stray capacitance and reduced touch drive scanning efficiency.
Innovation Solution
A touch display panel design featuring matrix-arranged touch electrodes with multiple common electrodes and touch leads arranged between adjacent columns of pixel units, connected to a touch chip via touch leads, allowing common electrodes to function as touch electrodes in the touch phase without additional manufacturing processes, thereby achieving self-capacitive in-cell touch technology without overlapping with pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch leads are arranged to connect touch electrodes to touch chip, then touch signals can be transmitted, but touch leads overlap with pixel electrodes causing increased stray capacitance and reduced touch drive scanning efficiency
Solution Approach 1:
The patent changes the spatial arrangement of touch leads from a planar layout (overlapping with pixel electrodes) to a three-dimensional routing that passes through empty spaces between pixel units. This dimensional change allows touch leads to connect touch electrodes without overlapping pixel electrodes, thereby reducing stray capacitance while maintaining touch signal transmission capability.
2Ease of manufacture
If in-cell touch technology is applied to large-size display panels, then module thickness is reduced and cost is lowered, but touch performance deteriorates due to complex and costly existing methods
Solution Approach 1:
The patent makes pixel units serve dual functions: they act as both display elements and as structural components that define the routing paths for touch leads. By utilizing the empty spaces between pixel units for lead routing, the design eliminates the need for additional complex touch-specific structures, thereby maintaining low manufacturing cost while achieving reliable touch performance in large-size panels.
Solution Approach 2:
The patent divides the large-size display panel into multiple pixel units arranged in a matrix, with each pixel unit containing sub-pixels. This segmentation allows touch leads to be routed through the spaces between individual pixel units, avoiding overlap with pixel electrodes and reducing stray capacitance across the entire large-size panel, thereby maintaining touch performance at low cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures good display and touch performance in large-size panels at a lower cost by reducing stray capacitance and enabling efficient touch drive scanning, while maintaining the original layered structure and manufacturing cost-effectiveness.
Implementation Method 1
a capacitive touch panel
Data Source
AI summary
A touch display panel, methods for manufacturing and driving the touch display panel and a display device are provided. The touch display panel includes an array substrate including matrix-arranged touch electrodes and matrix-arranged pixel units. Each touch electrode includes multiple common electrodes. One touch lead is arranged between every two adjacent columns of pixel units. Each touch electrode is connected to a pin of the touch chip via a corresponding touch lead. The common electrodes further function as the touch electrodes in a touch phase.