Display Panel with Segmented Common Electrodes for Touch Isolation
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Solution Overview
Problem
The existing OLED display panels with touch-control structures on thin film encapsulation (TFE) suffer from large parasitic capacitance between the common electrode and touch-control electrode, leading to significant interference between display and touch-control signals, and require additional process steps that increase production time.
Innovation Solution
The common electrode is divided into three parts by using isolation columns between pixel definition regions, comprising second electrodes on the light-emitting functional layer, suspension electrodes covering isolation columns, and touch-control electrodes on the pixel definition layer, eliminating the need for additional touch-control electrodes on TFE and reducing mutual interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the common electrode is configured as entire cathode, then the touch-control structure can be formed on TFE, but large parasitic capacitance is formed between the common electrode and touch-control electrode, resulting in significant interference between display and touch-control signals
Solution Approach 1:
The common electrode is divided into multiple independent electrode regions (first electrode region, second electrode region, third electrode region) through isolation columns. This segmentation reduces the overlapping area between the common electrode and touch-control electrode, thereby reducing parasitic capacitance and signal interference while maintaining the touch-control structure on TFE.
2Adaptability or versatility
If the touch-control structure is formed on TFE, then touch-control function is achieved, but additional process steps are required, extending production cycle
Solution Approach 1:
The common electrode and touch-control electrode are integrated into a unified electrode structure where the common electrode is segmented into multiple regions. This merging eliminates the need for separate touch-control electrode layers and additional process steps, reducing production cycle while maintaining touch-control functionality.
3Object-affected harmful factors
If the common electrode is divided into multiple disconnected electrode regions, then parasitic capacitance is reduced, but the complexity of electrode structure increases
Solution Approach 1:
Isolation columns are introduced as intermediary structures to separate and disconnect the common electrode into multiple regions. These isolation columns serve as mediators that achieve electrode segmentation and parasitic capacitance reduction without requiring complex electrode patterns, simplifying the overall electrode structure design.
Data Source
AI summary
A display panel includes a substrate; a driving circuit layer on the substrate; first electrodes on the driving circuit layer; a pixel definition layer on a side of the first electrodes away from the substrate, where the pixel definition layer is patterned to form pixel definition regions, and the pixel definition regions correspondingly expose the first electrodes; a light-emitting functional layer formed on the first electrodes at the pixel definition regions; isolation columns on the pixel definition layer between adjacent pixel definition regions; and a common electrode. The common electrode includes second electrodes covering the light-emitting functional layer, suspension electrodes covering a top surface of the isolation columns, and touch-control electrodes covering the pixel definition layer on a side of the isolation columns away from the pixel definition region; and the second electrodes, the suspension electrodes and the touch-control electrodes are disconnected from each other.