Touch Display Panel Dummy Electrode Shielding
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Solution Overview
Problem
Existing touch display panels have long charging times for touch electrodes, leading to low report rates due to high mutual capacitance between touch driving and sensing electrodes.
Innovation Solution
Incorporating a dummy electrode between second electrode blocks and first connecting electrodes, arranged in a floating-connection manner to shield and reduce mutual interference, thereby decreasing coupling capacitance and shortening charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch driving electrodes and touch sensing electrodes are arranged closely to improve touch sensitivity, then the mutual capacitance between electrodes increases, but the charging time of touch electrodes becomes longer
Solution Approach 1:
A dummy electrode is introduced as an intermediary element positioned between the touch sensing electrode and touch driving electrode. This dummy electrode acts as a shield that reduces the mutual capacitance between the functional electrodes, thereby decreasing the charging time while preserving touch sensitivity. The dummy electrode is connected to a reference potential, creating an electromagnetic shield that modifies the electric field distribution between the sensing and driving electrodes.
2Productivity
If the report rate of the touch display panel is increased, then the responsiveness improves, but the charging time requirement becomes more stringent and is not met by existing designs
Solution Approach 1:
The dummy electrode serves as a mediating structure that reduces the capacitive load on the touch driving electrode. By positioning the dummy electrode between the sensing and driving electrodes and connecting it to reference potential, the mutual capacitance is reduced, which directly decreases the charging time required. This enables the system to achieve higher report rates as the electrodes can be charged and discharged more quickly between touch detection cycles.
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 the charging time of touch electrodes and increases the report rate of the touch display panel by minimizing mutual interference between electrodes.
Implementation Method 1
the dummy electrode provided in a floating-connection manner separates the second electrode block from the first connecting electrode, so that the dummy electrode functions to shield the second electrode block and the first connecting electrode, thereby weakening the mutual interference between the second electrode block and the first connecting electrode, reducing the coupling capacitance between the second electrode block and the first connecting electrode
Data Source
AI summary
A touch display panel including first electrodes extending in a first direction and arranged in a second direction, and second electrodes extending in a second direction and arranged in the first direction; each first electrode includes first electrode blocks and first connecting electrodes arranged at intervals in the first direction; in the first electrode, two adjacent first electrode blocks are electrically connected by a first connecting electrode; each second electrode includes second electrode blocks and bridge structures arranged at intervals in the second direction; in each second electrode, two adjacent second electrode blocks are electrically connected by a bridge structure; the second electrode blocks are arranged in a different layer from the bridge structures; the bridge structures intersect the first connecting electrodes, and the dummy electrode is located between each second electrode block and the first connecting electrode adjacent thereto and intersects with the bridge structures.