Display Panel Capping Layer Gas Permeation Barrier
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Solution Overview
Problem
Display panels face issues with gas permeation from the light conversion layer, particularly under high-temperature and high-humidity environments, which can lead to deformation and performance degradation.
Innovation Solution
A display panel design incorporating a capping layer that prevents or reduces gas permeation, featuring a structure with a sub capping layer, a capping layer, and a second light control layer, where the capping layers are made of organic and inorganic materials respectively, and the second light control layer is a reflection or light blocking layer to manage light emission and prevent gas entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light conversion layer is used to convert light color, then the display panel can emit different color light, but gas is generated from the light conversion layer under high-temperature high-humidity environments causing permeation into internal spaces
Solution Approach 1:
A capping layer is introduced as an intermediary component between the light conversion layer and the internal display panel space. This capping layer acts as a barrier that prevents gas generated from the light conversion layer under high-temperature high-humidity conditions from permeating into the internal space, thereby protecting the display elements while maintaining the light conversion function.
Solution Approach 2:
The capping layer is constructed using composite material structure combining organic and inorganic materials. The organic layer provides flexibility and adhesion, while the inorganic layer provides superior gas barrier properties. This composite structure effectively blocks gas permeation paths while maintaining structural integrity under thermal and humidity stress.
2Reliability
If the capping layer is designed to prevent gas permeation, then panel integrity is maintained, but the structure becomes more complex with multiple layers including sub capping layer, capping layer, and second light control layer
Solution Approach 1:
The capping layer structure is designed to perform multiple functions simultaneously: (1) preventing gas permeation from the light conversion layer, (2) maintaining structural integrity under thermal and humidity stress, (3) providing a barrier against moisture, and (4) maintaining optical performance. By integrating these functions into a single multi-layer capping structure, the need for separate protective components is reduced, thereby managing complexity while enhancing reliability.
3Productivity
If high-temperature processing is applied to the light conversion layer, then light conversion efficiency is improved, but gas is generated that can permeate into internal spaces causing deformation
Solution Approach 1:
The capping layer is installed beforehand to cushion and protect the internal display panel space from gas permeation that may occur during high-temperature processing of the light conversion layer. This preventive barrier is in place before the high-temperature processing occurs, ensuring that any gas generated during efficiency-enhancing thermal treatment cannot reach and deform the internal components.
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
The solution effectively prevents gas permeation into the internal space between the display substrates, maintaining panel integrity and performance even under challenging environmental conditions.
Implementation Method 1
a capping layer including an absorption part overlapping the display area and being on the first light control layer and a barrier part overlapping the light blocking area and protruding from the absorption part in a thickness direction of the base substrate
Implementation Method 2
a capping layer including an absorption part overlapping the display area and being on the first light control layer
Implementation Method 3
a barrier part overlapping the light blocking area and protruding from the absorption part in a thickness direction of the base substrate
Implementation Method 4
the second light control layer may be a reflection layer including a metal material configured to reflect the first color light
Data Source
AI summary
The display panel includes an upper display substrate including a display area and a non-display area adjacent to the display area and a lower display substrate that faces the upper display substrate to emit first color light, the lower display substrate including a plurality of display elements respectively overlapping the pixel areas. The display area includes a plurality of pixel areas and a light blocking area adjacent to the pixel areas. The upper display substrate includes a base substrate, a first light control layer on the base substrate to control the first color light, a capping layer including an absorption part overlapping the display area and on the first light control layer and a barrier part overlapping the light blocking area and protruding from the absorption part in a thickness direction of the base substrate, and a second light control layer on the barrier part.