OLED Spacer Elastomer Buffering Film Layer Pressure
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Solution Overview
Problem
In top-emitting OLED display panels, the pressure from spacers during the cell-aligning process can crush film layers, leading to water and oxygen invasion, which results in poor luminescence and black spots on the display panel.
Innovation Solution
Incorporating elastomers with inverted trapezoidal cross-sections on the pixel defining layer, which are compressed by spacers to buffer pressure, thereby preventing film layer damage and ensuring the integrity of the light-emitting layer, along with an auxiliary cathode and contact electrode to manage voltage and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are used to maintain cell alignment during assembly, then positioning precision is improved, but film layers are crushed causing reliability deterioration
Solution Approach 1:
The elastomer acts as an intermediary between the spacer and the film layers. When the spacer presses against the elastomer during cell alignment, the elastomer deforms elastically to distribute the pressure, preventing direct contact between the spacer and the fragile film layers. This mediator approach resolves the contradiction by enabling precise alignment while protecting the film layers from crushing.
Solution Approach 2:
The elastomer is placed in advance at the contact position between the spacer and the array substrate. Its elastic properties provide beforehand cushioning that absorbs the pressing force during assembly, preventing damage to the film layers before they can be crushed. This prior cushioning ensures both alignment precision and film layer integrity.
2Manufacturing precision
If spacers press against the array substrate for alignment, then positioning accuracy is improved, but water and oxygen invasion increases causing quality deterioration
Solution Approach 1:
The elastomer serves as a protective intermediary that seals the interface between the spacer and the array substrate. Its elastic deformation creates a barrier that prevents water and oxygen from invading through the alignment interface, while still allowing the spacer to maintain positioning accuracy during assembly.
Solution Approach 2:
The elastomer functions as a flexible protective film that conforms to the contact surface between the spacer and substrate. This flexible film maintains the sealing function while accommodating the pressure during alignment, preventing harmful factors from penetrating through the interface without compromising positioning accuracy.
3Strength
If rigid spacers are used for structural stability, then mechanical strength is improved, but pressure concentration increases causing film layer damage
Solution Approach 1:
The elastomer mediator distributes the concentrated pressure from the rigid spacer across a larger area of the array substrate. The rigid spacer maintains its structural strength for stable alignment, while the elastomer intermediate layer prevents this strength from being transmitted as damaging concentrated forces to the film layers.
Solution Approach 2:
The system transitions the pressure distribution parameter from concentrated (rigid spacer direct contact) to distributed (elastomer-mediated contact). The elastomer's elastic modulus and deformation characteristics change the pressure profile, reducing peak stresses on the film layers while maintaining the rigid spacer's alignment function.
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 buffers pressure, prevents film layer crushing, and reduces water and oxygen invasion, enhancing the light-emitting yield and stability of the OLED display panel.
Implementation Method 1
a plurality of elastomers on the pixel defining layer and in one-to-one correspondence to positions of at least part of the spacers, where the elastomers are configured to be compressed by the corresponding spacers in a cell-aligning process of the first base substrate and the second base substrate to buffer pressure applied to layers on the second base substrate
Data Source
AI summary
Disclosed are an organic electroluminescence display panel, a manufacturing method therefor, and a display device. The organic electroluminescence display panel comprises an array substrate and an opposite substrate which are disposed opposite to each other; the opposite substrate comprises a first base substrate and multiple spacers located on the first base substrate, and the array substrate comprises a second base substrate, multiple sub pixels located on the second base substrate, a pixel defining layer for defining regions of the sub pixels, and elastomers located on the pixel defining layer and having one-to-one correspondence to at least part of the spacers in terms of position; the elastomers are compressed by the corresponding spacers during cell aligning to buffer the pressure applied to the array substrate.