Mutual Capacitive Embedded Touch Panel Junction Stripe Elimination
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Solution Overview
Problem
Conventional in-cell capacitive touch panels suffer from non-uniform capacitance at junction portions between adjacent touch units, leading to visible stripes due to the absence of overlapping scanning and common electrode layers, which affects display uniformity.
Innovation Solution
The capacitive embedded touch panel is designed with a common electrode layer divided into driving, floating, and shielding regions, along with strategically arranged touch driving and sensing electrodes and signal traces, ensuring electrical independence and seamless connections between touch units to maintain consistent capacitance across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the common electrode layer is continuously arranged across adjacent touch units, then the manufacturing process is simplified, but the capacitance uniformity deteriorates at junction portions
Solution Approach 1:
The common electrode layer is segmented into multiple regions (driving region, floating region, shielding region) with different functions. This segmentation allows the electrode to maintain continuity for manufacturing simplicity while creating controlled capacitance variations through regional differentiation, resolving the contradiction between manufacturing ease and capacitance uniformity.
Solution Approach 2:
Different regions of the common electrode layer are assigned different functional qualities: the driving region for active touch detection, the floating region for capacitance compensation at junctions, and the shielding region for interference reduction. This local quality differentiation ensures uniform capacitance distribution while maintaining a simplified continuous manufacturing process.
2Reliability
If the scanning line and common electrode layer overlap at non-junction portions, then the capacitance increases at those areas, but the capacitance uniformity deteriorates due to lower capacitance at junction portions
Solution Approach 1:
The floating region is designed to create an equipotential effect at junction portions by maintaining a specific electrical potential that compensates for the reduced capacitance. This equipotential design balances the capacitance levels between junction and non-junction portions, achieving uniformity while preserving the beneficial overlap-induced capacitance enhancement.
3Manufacturing precision
If the common electrode layer is divided into multiple regions with different functions, then the capacitance uniformity is improved, but the device complexity increases
Solution Approach 1:
Multiple functional regions (driving, floating, shielding) are merged into a single continuous common electrode layer structure. This merging approach achieves the capacitance uniformity benefits of regional differentiation while avoiding the complexity of separate electrode structures, as all regions are formed as one integrated layer.
Solution Approach 2:
The common electrode layer serves multiple functions simultaneously through its different regions: touch signal generation (driving region), capacitance compensation (floating region), and interference shielding (shielding region). This multi-functionality within a single unified structure improves capacitance uniformity without increasing overall device complexity.
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 eliminates the issue of visible stripes by maintaining similar capacitance at junction and non-junction portions, enhancing display uniformity and simplifying the panel structure, thereby improving overall performance and manufacturing efficiency.
Implementation Method 1
a capacitance at the junction portion is lower. An overlapping of the scanning line and the common electrode layer is existed at a non-junction portion such that a capacitance at the non-junction portion is higher
Data Source
AI summary
A mutual capacitive embedded touch panel is provided. The touch panel includes multiple touch units, each is formed by a pixel electrode layer, a first intermediate layer, a second intermediate layer, a common electrode layer, a third intermediate layer and a thin-film transistor array, wherein, the common electrode layer of each touch unit can be divided into a driving region, a first floating region, a second floating region, a first shielding region and a second shielding region; two opposite sides of the driving region respectively form the first and the second shielding regions; the first and the second floating regions are respectively formed at sides of the first second shielding regions away from the driving region. Accordingly, capacitance at the junction portion is similar with capacitance of the scanning line at the non-junction portion in to avoid generating obvious stripes at the junction portion of two adjacent touch units.