Porous Electrode Plate for OLED Moisture Management
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Solution Overview
Problem
Conventional organic electroluminescent (EL) display panel manufacturing methods face issues with moisture and acid absorption in planarizing films, leading to degraded organic layers, uneven display, and pixel shrinkage due to the wide coverage of cathode-lines, which are not effectively addressed by existing solutions.
Innovation Solution
The display panel apparatus incorporates an electrode plate with holes exposing the planarizing film surface, allowing moisture and acid outgassing, and an inorganic material layer covers these holes to prevent re-absorption, ensuring the organic layer quality and preventing electrode plate peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode plate is provided in a wide area to supply sufficient operational current, then the current supply capability is improved, but the planarizing film is sealed with moisture and acid inside causing organic layer degradation
Solution Approach 1:
The electrode plate is designed with a porous structure containing multiple holes, allowing the planarizing film to breathe and release absorbed moisture and acid while maintaining electrical conductivity and current supply capability
Solution Approach 2:
An inorganic material layer is introduced as an intermediary between the electrode plate and the organic layer, covering the holes to prevent re-absorption of moisture and acid while allowing the electrode plate to maintain its current supply function
2Area of moving object
If the electrode plate covers the planarizing film completely, then the contact area is increased improving current supply, but the planarizing film cannot release moisture and acid causing pixel shrinkage and uneven display
Solution Approach 1:
The electrode plate incorporates a controlled porous structure with holes that allow the planarizing film to release moisture and acid, preventing pixel shrinkage and display unevenness while maintaining sufficient contact area for current supply
3Reliability
If the planarizing film is covered by electrode plate, then sufficient operational current can be supplied, but moisture and acid leak to the organic layer causing quality degradation
Solution Approach 1:
An inorganic material layer serves as a protective intermediary that covers the holes in the electrode plate, preventing moisture and acid from leaking to the organic layer while allowing the electrode plate to continue supplying operational current
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 configuration reduces defects caused by moisture and acid, maintaining display quality, preventing pixel shrinkage and unevenness, and ensuring reliable current supply to the organic EL devices.
Implementation Method 1
an inorganic material layer made of an inorganic material, in contact with an upper surface of the electrode plate, located below the upper electrode, and covering the hole
Implementation Method 2
an electrode plate electrically connected to the auxiliary electrode and arranged to cover the planarizing film outside the display section, the electrode plate having a hole exposing a part of a surface of the planarizing film
Data Source
AI summary
A display panel apparatus includes a planarizing film formed on a substrate, at least one pixel including a lower electrode; an organic EL layer; and an upper electrode which are formed above the planarizing film; an auxiliary electrode electrically connected to the upper electrode which is the opposite to the lower electrode; a display section including a plurality of the pixels; an electrode plate electrically connected to the auxiliary electrode and arranged to cover the planarizing film outside the display section, and the electrode plate has a hole exposing a part of a surface of the planarizing film. Furthermore, the display panel apparatus also includes a hole injection layer which is an inorganic material layer made of an inorganic material and covering the hole.