Display Panel Shielding Layer for OLED Touch Noise Reduction
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Solution Overview
Problem
OLED touch integrated panels experience poor touch performance, particularly with active capacitive styluses, due to noise signals generated by parasitic capacitance and electromagnetic wave coupling between transfer traces and cathodes.
Innovation Solution
A shielding layer is introduced in the bezel region of the display panel, connected to the drive arrays and grounded, to shield noise signals and prevent parasitic capacitance, reducing noise signal strength in transfer traces and touch lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transfer traces are placed close to cathodes in the bezel region, then space utilization is improved, but noise signals are generated due to parasitic capacitance and electromagnetic wave coupling
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the transfer traces and cathodes. This shielding layer acts as a mediator that blocks electromagnetic wave coupling and parasitic capacitance effects, allowing the transfer traces to be positioned close to the cathodes while preventing noise signal generation. The shielding layer serves as a protective barrier that enables close spacing without the harmful electromagnetic interactions.
2Reliability
If a shielding layer is added to reduce noise signals, then touch performance is improved, but device complexity increases
Solution Approach 1:
The shielding layer is designed to serve multiple functions simultaneously: it shields against electromagnetic wave coupling, blocks parasitic capacitance effects, and can be integrated with the existing drive array structure. By making the shielding layer multi-functional, the solution improves touch performance while minimizing the increase in device complexity, as the same component addresses multiple noise sources rather than requiring separate shielding mechanisms for each issue.
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 shielding layer effectively reduces noise signal interference, improving the signal-to-noise ratio and touch performance, especially when using an active stylus.
Implementation Method 1
a shielding layer between the cathodes and the transfer traces and in the bezel region; an orthographic projection of the drive arrays in the bezel region onto the base, being in an orthographic projection of the shielding layer onto the base; the shielding layer being configured to shield noise signals
Implementation Method 2
noise signals generated by parasitic capacitance and electromagnetic wave coupling between transfer traces and cathodes
Data Source
AI summary
The disclosure relates to a display panel having a display region and a bezel region. The display panel includes a base, drive arrays, cathodes, a shielding layer, transfer traces, touch portions and touch lines. The drive arrays are on the base, and configured to drive the display panel to emit light. Cathodes are on a side of the drive arrays away from the base. The transfer traces is on a side of the cathodes away from the base, and in the bezel region. The touch lines are used to send touch signals and respectively electrically connected with the transfer traces. The shielding layer is between the cathodes and the transfer traces and is in the bezel region. A projection of the drive arrays in the bezel region onto the base is in a projection of the shielding layer onto the base. The shielding layer is configured to shield noise signals.