OLED Encapsulation Substrate Deformation Prevention
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Solution Overview
Problem
The deformation of thin encapsulation substrates in OLED displays due to their weight causes deterioration of display elements as the display size increases, leading to mechanical stress and potential damage to the encapsulation and light emitting layers.
Innovation Solution
A display apparatus design featuring a substrate with a main wall and a sub wall surrounding the pixel electrode, where the heights of these walls are strategically greater than the pixel electrode, and an encapsulation substrate is coupled to the substrate with a sealant, preventing deformation by distributing stress and maintaining the encapsulation integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the encapsulation substrate is made thin to reduce weight, then the weight of the OLED display is reduced, but the encapsulation substrate becomes prone to deformation as the display size increases
Solution Approach 1:
The patent introduces a stepped wall structure with two different heights (first height and second height) to solve the deformation problem. The first wall portion has a height greater than that of the pixel electrode, while the second wall portion has a height less than that of the pixel electrode. This dimensional variation in the wall structure provides mechanical support to prevent encapsulation substrate deformation while maintaining the thin-substrate-weight-reduction benefit.
2Weight of moving object
If the encapsulation substrate is made thin to reduce weight, then the weight of the OLED display is reduced, but the display element deteriorates due to mechanical stress from deformation
Solution Approach 1:
The stepped wall structure with varying heights provides differential mechanical support. The first wall portion with greater height prevents deformation at critical areas, thereby protecting the display element from mechanical stress and deterioration, while the overall substrate remains thin to maintain weight reduction benefits.
3Stability of the object's composition
If the height of the wall is increased to prevent deformation, then the encapsulation substrate deformation is reduced, but the manufacturing complexity increases
Solution Approach 1:
The wall is segmented into two distinct portions: a first wall portion with a greater height and a second wall portion with a lesser height. This segmentation allows each portion to serve different functional purposes - the first portion provides structural support to prevent deformation, while the second portion allows access to the pixel electrode. The segmentation resolves the contradiction by distributing the structural support function across different regions rather than requiring uniform height throughout.
Solution Approach 2:
Different portions of the wall have different heights tailored to local requirements. The first wall portion has a greater height where structural support is needed to prevent encapsulation substrate deformation, while the second wall portion has a lesser height where access to the pixel electrode is required. This local differentiation optimizes both deformation prevention and manufacturability.
Data Source
AI summary
A display apparatus includes; a substrate, a transistor formed on the substrate, a pixel electrode connected to the transistor, a wall surrounding the pixel electrode, the wall including a main wall and a sub wall, the main wall having a first height and the sub wall having a second height less than the first height of the main wall, an organic layer formed on the pixel electrode, a common electrode formed on the organic layer, and an encapsulation substrate coupled to the substrate.