In-Cell Touch Electrode Layout for Uniform Load Distribution
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Solution Overview
Problem
Existing in-cell touch type touch sensitive apparatuses experience image quality degradation due to load deviations in touch electrodes, which occur as the distance from the touch signal line contacts increases, leading to variations in voltage ripple return times and RMS values across the screen.
Innovation Solution
The apparatus incorporates touch electrodes in a mesh form with slits and overlapping touch signal lines, and uses connecting lines to reduce internal and inter-electrode load deviations by insulating and distributing the load more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch electrodes are connected to touch signal lines at single points, then device complexity is reduced, but load deviation between touch electrodes increases
Solution Approach 1:
The touch electrodes are divided into multiple segments along their length, with each segment connected to the touch signal line at different positions. This segmentation allows the load to be distributed more uniformly across multiple connection points, reducing the load deviation that would occur with a single connection point while maintaining manageable device complexity
Solution Approach 2:
Different regions of the touch electrode are provided with different connection characteristics - some regions have connection points closer together while others have them spaced further apart. This local variation in connection density compensates for the varying capacitance along the electrode length, achieving more uniform load distribution without requiring complete redesign of the entire connection structure
2Reliability
If touch signal lines are positioned closer to touch electrodes, then overlap capacitance increases for better sensitivity, but load deviation increases
Solution Approach 1:
The touch signal lines are segmented into multiple sections that connect to different portions of the touch electrode. By distributing the connection points along the electrode length rather than having a single close proximity connection, the capacitance is distributed more evenly, maintaining sensitivity while reducing load deviation
Solution Approach 2:
Additional intermediate connection structures are introduced between the touch signal line and the touch electrode. These intermediaries help distribute the capacitive coupling more uniformly along the electrode length, allowing the signal line to remain close for sensitivity while preventing excessive load deviation through the mediating connection structure
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 reduces load deviations and enhances image quality by minimizing overlap capacitance and uniformizing the load distribution across touch electrodes, thereby improving display consistency.
Implementation Method 1
sensing of touch electrodes is performed in the self-capacitance type
Implementation Method 2
reduces internal and inter-electrode load deviations by insulating and distributing the load more evenly, minimizing overlap capacitance
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.