Organic Light Emitting Display Protruding Pattern Layer Stress Distribution
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Solution Overview
Problem
The increasing thinness of organic light emitting display devices makes them more susceptible to damage from external forces, which can compromise the integrity of the elements within.
Innovation Solution
Incorporating a protruding pattern layer with spacers and an adhesive layer between the organic light emitting layers and the second substrate, and using a black matrix with color filters that extend onto its surface, to distribute and absorb external stress, thereby reducing the risk of damage to the organic light emitting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the organic light emitting display device is decreased to achieve slim portable electronic appliances, then the device becomes thinner and more portable, but the possibility of damage to elements due to external force increases
Solution Approach 1:
A protruding pattern layer is formed between the first and second substrates, creating a cushioning structure that absorbs external forces before they reach the organic light emitting layer. This protruding structure acts as a shock absorber, protecting the thin device elements from damage while maintaining the overall slim profile
Solution Approach 2:
The protective structure is implemented in the vertical dimension through the protruding pattern layer, which extends upward from the first substrate. This dimensional approach allows stress distribution in the thickness direction without increasing the device's planar dimensions, maintaining slimness while enhancing protection
2Reliability
If a protruding pattern layer with spacers is added to protect against external forces, then the resistance to damage from external force improves, but the device complexity increases
Solution Approach 1:
The protruding pattern layer serves multiple functions simultaneously: it provides mechanical protection against external forces, acts as a spacer to maintain substrate separation, and can be integrated with existing pixel structures. This multi-functionality reduces the need for separate protective components, thereby limiting the increase in device complexity
Data Source
AI summary
An organic light emitting display device includes: a first substrate; a plurality of pixels on the first substrate, each of the pixels including a corresponding portion of an organic light emitting layer on the first substrate; an encapsulation film on the organic light emitting layer; a protruding pattern layer on the encapsulation film and comprising a plurality of spacers at a boundary between adjacent ones of the pixels; an adhesive layer on the protruding pattern layer; and a second substrate on the adhesive layer.