Staggered Touch Electrodes for Precision and Lead Reduction
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Solution Overview
Problem
Conventional touch display panels suffer from poor touch precision and sensitivity due to the 'ghost points' phenomenon and high signal-noise ratio, especially in large size displays with numerous touch sensing units and lead lines.
Innovation Solution
The touch display panel incorporates an underlay substrate with touch electrodes arranged in a staggered pattern along intersecting directions, where each pattern electrode has a first width in one direction and a second width greater than the first in the perpendicular direction, reducing the number of touch lead lines and improving touch accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch electrodes are arranged in a grid pattern with uniform dimensions, then the touch sensing units can be uniformly distributed, but the number of lead lines increases significantly, causing high signal-noise ratio and poor touch precision
Solution Approach 1:
The touch electrode is segmented into a first electrode and a second electrode that are electrically connected but spatially separated. This segmentation allows the electrode to interact with touch inputs from multiple directions independently, improving touch precision while reducing the number of lead lines needed for signal extraction.
Solution Approach 2:
The patent introduces a dimensional change by extending the electrode in the second direction (width) more than in the first direction (length). This creates an elongated electrode configuration that improves touch detection capability in the width direction while maintaining manageable lead line complexity through the staggered arrangement.
2Measurement precision
If the touch electrode has equal width and length, then the electrode structure is simple and symmetrical, but the touch area is insufficient and touch sensitivity is reduced
Solution Approach 1:
The patent applies asymmetry by setting the width of the touch electrode in the second direction to be greater than its length in the first direction. This asymmetric configuration increases the touch area and improves touch sensitivity, particularly in the width direction, while the staggered arrangement keeps the overall structure manageable.
3Area of stationary object
If multiple touch sensing units are arranged in a large size display panel, then the display coverage is increased, but the signal-noise ratio increases and touch effect deteriorates
Solution Approach 1:
The patent merges the functionality of multiple touch sensing units by using a single elongated electrode structure that can detect touches across a larger area. The first and second electrodes work together to provide touch sensing coverage equivalent to multiple smaller units while maintaining lower signal-noise ratio through reduced lead line count.
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 configuration enhances touch precision and effect, reduces manufacturing costs, and improves the overall performance of the touch display panel by minimizing signal interference and increasing the touch area of the electrodes.
Implementation Method 1
a touch display panel is capable of performing a touch operation on screen... projected capacitive touch screens are mainly applied to the market
Data Source
AI summary
An embodiment of the present invention provides a touch display panel and a touch display device including an underlay substrate and touch electrodes. The touch electrodes include a plurality of pattern electrodes. Adjacent ones of the pattern electrodes along are arranged in a staggered arrangement a first direction. The pattern electrode has a first width along the first direction and has a second width along a second direction. The second width is greater than the first width. Changing an arrangement of the pattern electrodes reduces touch lead lines in the display panel, improves a touch precision of the display panel, and lowers a manufacturing cost.