Display Panel Sensing Electrode Noise Reduction
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Solution Overview
Problem
Display panels face challenges with noise interference between sensing electrodes and pixels, affecting sensing sensitivity and leading to distorted driving signals and reduced lifetime due to afterimage defects.
Innovation Solution
The design incorporates a display panel with a light-emitting device having a first and second electrode separated by an intermediate layer, a pixel defining layer with a light-emitting opening, and a sensing electrode with a pattern portion overlapping a separator, where the bridge portion is electrically connected to the pattern portion and partially covered by the separator, enhancing sensing sensitivity and reducing afterimage defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensing electrodes are added to enable sensing function, then sensing capability is provided, but noise interference between sensing electrodes and pixel electrodes increases
Solution Approach 1:
A separator structure is introduced as an intermediary element positioned between the sensing electrode and the pixel electrodes. The separator includes a separating opening that allows the sensing electrode to extend through, creating physical separation and reducing capacitive coupling noise while maintaining electrical connection functionality.
Solution Approach 2:
The sensing electrode is divided into multiple segments (first sensing electrode portion, second sensing electrode portion, third sensing electrode portion) separated by the separator structure. This segmentation reduces the continuous area of the sensing electrode, thereby reducing noise interference while preserving sensing capability through distributed sensing points.
2Length of stationary object
If sensing electrodes are disposed close to pixel electrodes for compact design, then device thickness is reduced, but noise interference and afterimage defects increase
Solution Approach 1:
The separator structure utilizes the vertical dimension (thickness direction) to create separation between the sensing electrode and pixel electrodes. By positioning the separator in the thickness direction with a separating opening, the design achieves noise reduction without increasing the planar footprint, thus maintaining compact panel thickness.
Solution Approach 2:
The separator provides localized separation only in critical regions where noise interference occurs, while allowing the sensing electrode to maintain close proximity to pixel electrodes in other areas. The separating opening is strategically positioned to reduce noise at specific locations without compromising overall sensing performance or increasing panel thickness.
3Measurement precision
If sensing electrodes overlap pixel electrodes extensively for improved sensing sensitivity, then sensing sensitivity increases, but noise interference and afterimage defects worsen
Solution Approach 1:
The separator acts as a mediator that enables the sensing electrode to overlap with pixel electrodes in the planar view for improved sensing sensitivity, while simultaneously providing vertical separation to reduce noise interference and afterimage defects. The separating opening allows controlled overlap regions while blocking noise in other areas.
Data Source
AI summary
Provided is a display panel including a light-emitting device including a first electrode, a second electrode, and a light-emitting layer, a pixel defining layer having a light-emitting opening defined therein the pixel defining layer not covering at least a center portion of the first electrode, a separator disposed on the pixel defining layer and having a separating opening defined therein and overlapping the light-emitting opening, and a sensing electrode including a pattern portion overlapping the separator and a bridge portion electrically connected to the pattern portion. At least a portion of the pattern portion is disposed on the separator and electrically disconnected from the second electrode along an edge of the separator and the bridge portion is disposed on the pixel defining layer, wherein the bridge portion includes a first portion which overlaps the separator and a second portion which does not overlap the separator.