Flexible OLED Display Panel Signal Shielding for Touch Interference
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Solution Overview
Problem
Existing self-capacitive touch solutions for flexible OLED displays suffer from signal interference between touch wires and sub-touch electrodes, leading to poor touch performance.
Innovation Solution
A display panel design featuring signal shielding lines and monitoring lines to mitigate signal interference, where the signal shielding lines are aligned between functional unit groups and driven by the same constant voltage as the signal transmission lines, and the monitoring lines detect interference in real-time for removal by a chip algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a self-capacitive touch structure with independent sub-touch electrodes and touch wires is used, then touch sensitivity is improved, but signal interference between touch wires and sub-touch electrodes occurs, leading to poor touch performance
Solution Approach 1:
The patent introduces signal shielding lines as intermediary elements positioned between the touch wires and sub-touch electrodes. These shielding lines act as mediators that block or reduce the electromagnetic interference between the touch wires and electrodes, allowing the self-capacitive touch structure to maintain its high sensitivity while eliminating the signal interference problem.
Solution Approach 2:
The patent implements signal monitoring lines that detect interference signals in real-time and provide feedback to the driver chip. The driver chip then processes this feedback information to compensate for or remove the detected interference, thereby maintaining accurate touch detection despite the presence of interfering signals in the complex touch wire layout.
2Area of stationary object
If multiple independent sub-touch electrodes are arranged closely to improve touch coverage, then touch functionality is enhanced, but signal interference between adjacent electrodes and wires increases
Solution Approach 1:
Signal shielding lines are strategically positioned between adjacent functional unit groups and between touch wires and sub-touch electrodes. These shielding lines serve as physical barriers that segment the electromagnetic fields, allowing dense arrangement of touch electrodes for full coverage while preventing interference between adjacent elements through the shielding effect.
Solution Approach 2:
The patent divides the touch sensing area into multiple functional unit groups with gaps between them, and introduces shielding lines to further segment the electromagnetic environment. This segmentation approach allows each unit to operate independently with minimal interference, enabling comprehensive touch coverage across the entire display area while maintaining signal integrity in each segmented region.
Data Source
AI summary
A display panel is provided. The display panel includes a plurality of functional unit groups arranged in a display area. Each functional unit group includes at least one functional unit. Each functional unit is electrically connected to a first signal transmission line. A signal shielding line is disposed between the first signal transmission lines of a same functional unit group and a functional units of an adjacent functional unit group to solve a problem of poor touch performance caused by signal interference in existing touch solutions.