Electroluminescent Device Pixel Defining Layer Connection Channels
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Solution Overview
Problem
In electroluminescent devices, the uneven thickness of electroluminescent layers due to differences in the amount of electroluminescent material deposited by ink-jetting leads to uneven light emission and performance issues like Mura, where electroluminescent layers of the same color have different thicknesses.
Innovation Solution
The formation of connection channels on the pixel defining layer, arranged either horizontally or longitudinally, to connect pixel apertures in a row or column, ensuring equal amounts of electroluminescent material are deposited across identical color layers, resulting in uniform thickness and improved light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ink-jetting is used to deposit electroluminescent material, then the manufacturing process is simplified and productivity is improved, but the thickness of electroluminescent layers becomes uneven due to variations in solution deposition amount
Solution Approach 1:
The patent introduces a connection channel as an intermediary structure that communicates between adjacent pixel apertures. This channel allows the electroluminescent material solution to flow between pixels, acting as a mediator that compensates for deposition variations and equalizes the solution amount in each pixel, thereby resolving the thickness uniformity issue while maintaining ink-jetting productivity
Solution Approach 2:
The connection channel creates a fluid communication path that equalizes the potential (solution level) across adjacent pixels. By allowing free flow of the electroluminescent material solution between pixels through the channel, the system achieves equipotentiality in terms of solution distribution, ensuring uniform layer thickness across all pixels
2Productivity
If the amount of electroluminescent material solution varied by nozzle, then the manufacturing process is faster, but uneven light emission and Mura effects occur
Solution Approach 1:
The connection channel serves as a compensatory intermediary that corrects the uneven material distribution caused by nozzle variations. By providing a flow path between pixels, it allows excess material to redistribute to pixels that received less, thereby eliminating Mura effects while maintaining the high-speed ink-jetting process
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 ensures that electroluminescent layers of the same color have identical thickness, enhancing the evenness of light emission and improving the overall performance of the electroluminescent device by maintaining uniformity in layer thickness.
Implementation Method 1
an electroluminescent layer in a predetermined color is formed in each pixel aperture
Data Source
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Figure 5b
AI summary
The present disclosure provides an electroluminescent device, its manufacturing method, a display substrate and a display device. The electroluminescent device includes a substrate, and a pixel defining layer arranged on the substrate. A pixel aperture matrix is formed in the pixel defining layer, at least one connection channel is formed on the pixel defining layer, an electroluminescent layer in a predetermined color is formed in each pixel aperture of the pixel aperture matrix, and the connection channel is configured to connect at least two pixel apertures of the pixel aperture matrix in an identical row or column and corresponding to the electroluminescent layers in an identical color. According to the present disclosure, through the connection channels formed on the pixel defining layer, when the solution of the electroluminescent material is dripped into the pixel aperture, the amounts out the solution of the electroluminescent material in the pixel apertures in an identical row or column and corresponding to the electroluminescent layers in an identical color are the same, and the electroluminescent layers formed after the drying are of an identical thickness. As a result, it is able to enable the electroluminescent device to emit light in an even manner, thereby to improve the performance of the electroluminescent device.