Display Insulating Layer Stack for Polarizer Ammonia Protection
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Solution Overview
Problem
In organic electroluminescence display devices, moisture entering from outside or present in organic resins reacts with nitrogen-containing films, generating ammonium ions that can cause ammonia production, leading to color loss and defects in polarizing plates.
Innovation Solution
A display device structure incorporating a third organic insulating layer with stronger acidity than the second organic insulating layer, positioned between the nitrogen-containing sealing film and the polarizing plate, to neutralize or adsorb ammonia, preventing it from reaching the polarizing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nitrogen-containing sealing film is used to prevent moisture entry, then moisture protection is improved, but ammonia production occurs due to reaction with moisture, leading to color loss in polarizing plates
Solution Approach 1:
An organic insulating layer is introduced as an intermediary between the nitrogen-containing sealing film and the polarizing plate. This intermediate layer captures ammonia generated by the reaction between moisture and the nitrogen-containing film, preventing ammonia from reaching and damaging the polarizing plate.
Solution Approach 2:
The harmful ammonia generated by the reaction between moisture and the nitrogen-containing sealing film is converted into a beneficial situation by having the organic insulating layer absorb and neutralize it. The harmful byproduct of the moisture-protection mechanism is captured and rendered harmless, allowing the nitrogen-containing film to continue providing effective moisture barrier protection.
2Reliability
If inorganic sealing films (silicon nitride or silicon oxide) are used above light emitting elements, then moisture prevention is improved, but ammonia generation occurs from moisture reaction, causing polarizing plate defects
Solution Approach 1:
The organic insulating layer serves as a mediator positioned between the inorganic sealing film and the polarizing plate. It intercepts ammonia generated from the reaction between moisture and the nitrogen-containing inorganic film, preventing the ammonia from reaching the polarizing plate and causing color loss or defects.
Solution Approach 2:
The harmful ammonia produced by the moisture-inorganic film reaction is converted into a controlled situation where the organic insulating layer absorbs and neutralizes it. This allows the inorganic sealing film to maintain its excellent moisture barrier properties while the organic layer handles the ammonia byproduct, protecting the polarizing plate.
3Ease of manufacture
If organic resins containing moisture are used in the sealing structure, then ease of manufacture is improved, but ammonia production increases due to moisture reaction with nitrogen-containing films
Solution Approach 1:
The organic insulating layer acts as an intermediary that captures ammonia generated from the reaction between moisture in the organic resin and the nitrogen-containing sealing film. This intermediate layer prevents ammonia from reaching the polarizing plate, allowing the use of moisture-containing organic resins for ease of manufacture while protecting against ammonia damage.
Solution Approach 2:
The ammonia generated by the reaction between moisture in the organic resin and the nitrogen-containing film is converted from a harmful byproduct into a controlled situation. The organic insulating layer absorbs and neutralizes the ammonia, allowing manufacturers to use convenient organic resin materials while preventing polarizing plate degradation.
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 effectively suppresses ammonia-induced color changes in the polarizing plate, enhancing the reliability and reducing defects in the display screen by neutralizing or adsorbing ammonia generated from nitrogen-containing films.
Implementation Method 1
a third organic insulating layer on the second organic insulating layer, acidity of the third organic insulating layer being stronger than acidity of the second organic insulating layer
Data Source
AI summary
A display device includes a first substrate, a display region with pixels each including a light emitting element above the first substrate, a first inorganic insulating layer covering the display region, a first organic insulating layer on the first inorganic insulating layer, a second inorganic insulating layer on the first organic insulating layer, a second organic insulating layer on the second inorganic insulating layer, a third organic insulating layer a on the second organic insulating layer, acidity of the third organic insulating layer being stronger than acidity of the second organic insulating layer, and a polarizing plate arranged on the third organic insulating layer.