Touch Display Mesh Electrodes for Reduced Load Deviation
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Solution Overview
Problem
Existing in-cell touch type touch sensitive apparatuses experience image quality degradation due to load deviations among touch electrodes, which occur as the distance from the touch signal line contacts increases, leading to variations in voltage ripple times and RMS values across the screen.
Innovation Solution
The apparatus includes touch electrodes arranged in a mesh form with slits and connected to touch signal lines through multiple contacts, and additional connecting lines in different layers to reduce internal and inter-electrode load deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch electrodes are connected to touch signal lines through single contact points, then the connection structure is simple, but load deviations occur among touch electrodes as distance from contact increases
Solution Approach 1:
The touch electrode is divided into multiple contact regions that connect to the touch signal line at multiple points along its length. This segmentation allows different portions of the touch electrode to be connected at optimally spaced intervals, reducing the distance from any point on the electrode to its nearest contact point, thereby minimizing load deviations while maintaining a relatively simple connection structure.
Solution Approach 2:
The connection structure is designed with varying contact densities at different locations. Touch electrodes in regions where load deviation is more critical have more frequent contact points, while other regions have fewer contacts. This local optimization ensures that each region has appropriate contact density to minimize load deviations, balancing connection complexity with load uniformity.
2Reliability
If multiple contacts are used to connect touch electrodes to touch signal lines, then load deviations are reduced, but device complexity increases
Solution Approach 1:
The connection structure utilizes the vertical dimension by forming contacts at different depth levels within the touch sensor stack. Multiple contacts are distributed across different layers or depths, allowing the system to achieve load uniformity through three-dimensional contact distribution rather than increasing horizontal contact density, thereby reducing the perceived complexity of the connection structure.
Solution Approach 2:
The connection structure is nested within the existing touch sensor architecture, with contact points integrated into the layered structure of the touch electrode and signal line. The multiple contacts are embedded within the depth of the sensor layers, utilizing the existing vertical space rather than adding external connection elements, thus reducing overall device complexity while achieving improved load uniformity.
3Length of moving object
If touch electrodes are positioned farther from touch signal line contacts, then electrode spacing is increased, but voltage ripple times and RMS values vary across the screen
Solution Approach 1:
The touch electrode is pre-configured with multiple contact points distributed along its length before operation. This preliminary distribution of contacts ensures that during operation, no region of the electrode is too far from a contact point, maintaining consistent electrical characteristics and voltage stability across the entire electrode regardless of its overall spacing from other electrodes.
Solution Approach 2:
The multiple contact points are positioned to create equipotential regions across the touch electrode, ensuring that all portions of the electrode are electrically balanced. By distributing contacts to equalize the electrical potential across different regions, the system maintains consistent voltage ripple characteristics and RMS values, achieving voltage consistency while allowing flexible electrode spacing.
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 reduces load on each touch electrode and minimizes load deviations, thereby enhancing image quality by stabilizing voltage ripple times and reducing RMS voltage variations.
Implementation Method 1
Capacitive touch panels are categorized into a mutual capacitance type and a self-capacitance type... sensing of touch electrodes is performed in the self-capacitance type
Implementation Method 2
Each of the plurality of touch electrodes 10 is connected to one touch signal line 20
Data Source
AI summary
Disclosed is a touch sensitive display apparatus which decreases a load of each of a plurality of touch electrodes and reduces a load deviation between the plurality of touch electrodes, thereby enhancing image quality. The touch sensitive display apparatus comprises a touch sensitive panel. The touch panel comprises a plurality of touch electrodes comprising at least a first touch electrode. The first touch electrode comprises a plurality of first touch electrode lines that are parallel to each other. A first touch signal line is connected to the plurality of first touch electrode lines of the first touch electrode, and the first touch electrode is driven for image display and touch sensing via the first touch signal line. A first connecting line is in a different layer than the first touch electrode lines, and the first connecting line is connected to the plurality of first touch electrode lines.