Display Unit Pillar Shock Attenuation via Buffer Film
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Solution Overview
Problem
In organic light emitting display units, the formation of pillars to connect auxiliary electrodes to second electrodes can cause damage to other components due to variations in pillar length and contact pressure, leading to voltage drop and reduced light extraction efficiency.
Innovation Solution
A display unit configuration with a plurality of films stacked as an auxiliary electrode, where the pillars are inclined to the substrates or a buffer film is provided between the auxiliary electrode and the second substrate, to attenuate shock and reduce contact pressure on other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pillars are formed to connect auxiliary electrode to second electrode, then voltage drop is reduced and electrical connection is improved, but damage to substrates and other components occurs due to variations in pillar length and contact pressure
Solution Approach 1:
A buffer film is provided between the auxiliary electrode and the second substrate to cushion and absorb shock before it reaches the substrate. This preventive measure reduces damage to the substrate while maintaining the electrical connection function of the pillars.
Solution Approach 2:
The buffer film acts as an intermediary layer between the auxiliary electrode and the second substrate. It mediates the mechanical stress and shock from pillar formation, protecting the substrate while allowing electrical connection to proceed.
2Reliability
If thickness of the second electrode is increased, then resistance value is lowered and voltage drop is reduced, but visible light transmittance is lowered resulting in reduced light extraction efficiency
Solution Approach 1:
The electrode system is segmented into the second electrode and the auxiliary electrode. The second electrode maintains optimal thickness for light transmittance, while the auxiliary electrode (connected via pillars) provides additional electrical pathways to reduce voltage drop, thus separating the conflicting requirements of conductivity and transmittance.
Solution Approach 2:
The auxiliary electrode acts as an intermediary electrical pathway that reduces voltage drop without interfering with the optical properties of the second electrode. It provides additional current distribution while the second electrode maintains its light transmittance 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
This configuration reduces damage to substrates and maintains electrical connection between the auxiliary electrode and the second electrode, improving display quality by minimizing voltage drop and enhancing light extraction efficiency.
Implementation Method 1
when the auxiliary electrode is brought in contact with the second electrode of the display element via the pillars, shock is gradually attenuated while being transferred through the respective films configuring the auxiliary electrode
Data Source
AI summary
A display unit includes a first substrate and a second substrate opposed to each other, a display element having a first electrode and a second electrode on the first substrate, an auxiliary electrode provided on a surface facing the first substrate of the second substrate, and including a plurality of films stacked in a direction from the second substrate to the first substrate, and a plurality of pillars configured to electrically connect the auxiliary electrode to the second electrode.