OLED Touch Lead Shielding Layout for Signal Interference Reduction
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Solution Overview
Problem
The mutual interference between touch signals and data signals in OLED displays due to coupling capacitance between touch leads and data leads is not effectively addressed in existing technologies.
Innovation Solution
A display panel design that includes shielding lines positioned between the orthographic projections of touch leads and data leads, alternately distributing touch and data lead sets, and employing multiple shielding sub-lines and via holes to shield the electric field, thereby reducing coupling capacitance and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch leads and data leads are configured in the OLED display, then touch functionality and data transmission are enabled, but coupling capacitance between the leads causes mutual interference between touch signals and data signals
Solution Approach 1:
The patent introduces shielding leads as intermediary elements positioned between touch leads and data leads. These shielding leads act as mediators that block the electric field coupling between the two types of leads, thereby preventing signal interference while allowing both touch and data functions to operate simultaneously
Solution Approach 2:
The patent extracts the harmful electric field effect by removing the direct coupling path between touch leads and data leads. By inserting shielding leads and grounding them, the harmful capacitive coupling is eliminated, separating the touch signal path from the data signal path
2Object-affected harmful factors
If shielding lines are added between touch leads and data leads, then signal interference is reduced, but device structure becomes more complex
Solution Approach 1:
The patent merges the shielding function with the existing lead structure by integrating shielding leads into the same lead framework. The shielding leads are configured alongside touch and data leads in a unified structure, reducing overall complexity compared to adding separate shielding components
Solution Approach 2:
The shielding leads serve multiple functions: they act as electric field shields, provide grounding paths, and maintain structural integrity of the lead arrangement. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in 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
The design effectively shields the electric field generated by touch leads, reducing mutual interference between touch and data signals, improving display and touch effects, and facilitating a narrow frame design while maintaining structural integrity during bending.
Implementation Method 1
at least one shielding line positioned on a portion, in the peripheral area, of the substrate, an orthographic projection, on the substrate, of the shielding line being positioned between an orthographic projection, on the substrate, of the touch lead and an orthographic projection, on the substrate, of the data lead
Data Source
AI summary
A display panel, including a substrate base plate, touch electrodes, and touch lead wires on the substrate base plate. One end of the touch lead wire is coupled with the touch electrode, the other end thereof is in a peripheral area, the touch lead wires in the display panel are divided into touch lead wire sets, each touch lead wire set includes touch lead wires, data lead wires on the substrate base plate in the peripheral area, the data lead wires are divided into data lead wire sets, each data lead wire set includes data lead wires. The touch lead wire sets and the data lead wire sets are distributed in a staggered manner, one shielding line on the substrate base plate in the peripheral area, an orthographic projection of the shielding line is between orthographic projections of the touch lead wire and the data lead wire.