Acoustic Pixel Defining Layer for WOLED Charge Leakage
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Solution Overview
Problem
Existing array substrates for WOLED devices suffer from color mixing due to electron leakage between adjacent pixel regions, leading to poor display effects.
Innovation Solution
Incorporating acoustic structures in the pixel defining layer that resonate at a threshold frequency to form slits and disconnect the charge generating layer between adjacent pixel regions, preventing lateral electron flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charge generating layer is continuous across pixel regions to enable charge transport, then charge transport efficiency is improved, but electron leakage between adjacent pixel regions occurs causing color mixing
Solution Approach 1:
The pixel defining layer is segmented into multiple acoustic structures (e.g., tuning forks, grooves) that create physical partitions between adjacent pixel regions. These structures divide the continuous charge generating layer into isolated segments, preventing electron leakage while maintaining charge transport within each pixel region. The segmentation is achieved through patterns such as parallel grooves or tuning fork shapes that extend across the pixel region boundaries.
Solution Approach 2:
The acoustic structures in the pixel defining layer act as intermediary elements between adjacent pixel regions. These structures (made of insulating materials) serve as mediators that physically separate the charge generating layer, blocking the harmful electron leakage pathway while allowing the charge transport function to be maintained within each isolated pixel region through the acoustic wave resonance mechanism.
2Object-generated harmful factors
If acoustic structures are added to the pixel defining layer to prevent electron leakage, then color mixing is reduced, but device complexity increases
Solution Approach 1:
The pixel defining layer is designed to perform multiple functions simultaneously: it maintains the charge generating layer, defines pixel regions, and incorporates acoustic structures that prevent electron leakage. By integrating the anti-leakage function into the existing pixel defining layer rather than adding separate components, the structure achieves multi-functionality without proportionally increasing complexity. The acoustic structures are formed using the same layer deposition and patterning processes.
Solution Approach 2:
The acoustic structures are merged with the pixel defining layer, combining the charge confinement function and the electron leakage prevention function into a single integrated structure. The pixel defining layer and acoustic structures are formed together in the same fabrication process, eliminating the need for separate components and reducing overall device complexity while achieving the desired color mixing prevention.
3Reliability
If the pixel defining layer height is increased to improve charge confinement, then electron leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Instead of relying solely on static geometric dimensions (layer height) for charge confinement, the invention introduces dynamic acoustic wave resonance into the pixel defining layer. The acoustic structures respond dynamically to applied acoustic waves, creating time-varying potential barriers that enhance charge confinement. This dynamic mechanism reduces dependence on precise static dimensional control, lowering manufacturing precision requirements while maintaining effective charge confinement.
Solution Approach 2:
The invention changes the confinement mechanism from purely geometric (static height-based) to acoustic (dynamic resonance-based). By utilizing acoustic wave frequency and resonance parameters instead of relying only on physical dimensions, the system achieves effective charge confinement with more relaxed dimensional tolerances. The acoustic resonance parameter becomes the primary control variable rather than layer thickness.
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
This solution effectively prevents color mixing by cutting off the lateral leakage current path, thereby enhancing the display effect by ensuring accurate light emission from individual pixel regions.
Implementation Method 1
each of the plurality of acoustic structures may be configured to resonate under an action of an acoustic wave of a threshold frequency to form a slit to disconnect the charge generating layer of two adjacent pixel regions
Data Source
AI summary
An array substrate is disclosed. The array substrate may include a base substrate (21), a pixel defining layer (22) on the base substrate (21), and a charge generating layer (24) above the pixel defining layer (22). The pixel defining layer (22) may define a plurality of pixel regions. The pixel defining layer (22) may include a plurality of acoustic structures (220), and each of the plurality of acoustic structures (220) may be configured to resonate under an action of an acoustic wave of a threshold frequency to form a slit to disconnect the charge generating layer (24) of two adjacent pixel regions of the plurality of pixel regions.