Organic Luminescent Display Anode Adhesion Layer Design
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Solution Overview
Problem
Organic luminescent display devices face challenges in achieving higher definition, higher brightness, and prolonged product lifetime due to the low adhesiveness of silver reflection layers with organic films, leading to potential moisture intrusion and peeling issues.
Innovation Solution
The use of an adhesion layer containing titanium or titanium nitride, positioned outside the edge of the silver reflection layer, along with a light-transmitting contact layer, enhances adhesion and prevents gaps, thereby improving the structural integrity and longevity of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection layer made of silver is formed to realize high brightness, then brightness is improved, but adhesiveness with the organic film deteriorates causing peeling and moisture intrusion
Solution Approach 1:
An adhesion layer is introduced as an intermediary between the silver reflection layer and the organic film. This adhesion layer serves as a mediator that provides both adhesion to the organic film and reflectivity functionality, thereby resolving the contradiction between brightness and adhesiveness.
Solution Approach 2:
The anode is constructed as a composite structure comprising multiple layers (adhesion layer, reflection layer, and organic electro luminescent element). This composite material approach combines materials with different properties to simultaneously achieve high brightness and reliable adhesion.
2Reliability
If the adhesion layer edge is positioned outside the reflection layer edge to prevent gaps, then reliability is improved, but device complexity increases
Solution Approach 1:
The adhesion layer serves multiple functions: it provides adhesion to the organic film, acts as a barrier to prevent moisture intrusion, and its extended edge configuration prevents gap formation. This multi-functionality justifies the additional layer without proportionally increasing complexity.
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 reduces moisture intrusion and peeling risks, enabling higher definition, higher brightness, and extended product lifetime by ensuring better adhesion and contact between the reflection layer and the organic film.
Implementation Method 1
an adhesion layer containing molybdenum and chromium which is formed between the bank and the auxiliary electrode
Implementation Method 2
a reflection layer made of silver is formed for realizing high brightness
Data Source
AI summary
An organic luminescent display device according to the invention includes: an element substrate; an organic film; and an organic electro luminescent element formed on the organic film. The organic electro luminescent element includes: an anode formed on the organic film; a light emitting layer formed on the anode; and a cathode formed on the light emitting layer. The anode includes: an adhesion layer formed in contact with an upper surface of the organic film; a reflection layer and formed in contact with an upper surface of the adhesion layer; and a light transmitting contact layer formed on the reflection layer. An edge portion of an outer periphery of the adhesion layer is positioned outside an edge portion of an outer periphery of the reflection layer as viewed in a plan view.