Flexible OLED Touch Display Protrusions Reduce Parasitic Capacitance
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Solution Overview
Problem
A small gap between the cathode and the touch electrode on flexible OLED displays results in large parasitic capacitance, affecting touch sensitivity and performance.
Innovation Solution
Incorporating protrusions on the insulation layer of the touch layer, which coincides with the support pillars, to increase the gap between the cathode and the conductive layer, reducing parasitic capacitance and enhancing touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cathode is vapor-deposited on the entire surface including support pillars, then the manufacturing process is simplified, but the gap between the cathode on support pillars and the touch electrode becomes small, resulting in large parasitic capacitance
Solution Approach 1:
The patent introduces a vertical dimension by forming protrusions on the insulation layer that align with the support pillars. This vertical protrusion structure increases the gap between the cathode and touch electrode in the region above support pillars, thereby reducing parasitic capacitance while maintaining the simplicity of the overall manufacturing process
Solution Approach 2:
The patent applies local modification by forming protrusions only in specific regions where support pillars are located, rather than uniformly across the entire display. This localized structural change addresses the parasitic capacitance issue only where needed, preserving touch sensitivity in affected regions while maintaining uniform performance elsewhere
Data Source
AI summary
A touch display device is provided, which includes an organic light-emitting diode display panel, the organic light-emitting diode display panel includes support pillars and a cathode, a part of the cathode is formed on the support pillars; a touch layer includes an insulation layer and a first conductive layer, the insulation layer is provided with protrusions, a part of the first conductive layer is positioned on a side of the protrusions away from the cathode, and orthographic projections of the protrusions on the touch display device at least partially coincide with orthographic projections of the support pillars on the touch display device.