Display Device Auxiliary Electrode Side Surface Partition Wall
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Solution Overview
Problem
In high-aperture ratio display devices, forming an auxiliary electrode on the top surface of a partition wall is challenging due to the need for a narrower width than the partition wall, making it difficult to inhibit voltage drops effectively.
Innovation Solution
A display device structure with a first and second lower electrode, an auxiliary electrode positioned between them, and a partition wall with a stacked-layer structure of inorganic and organic insulators, where the auxiliary electrode is electrically connected to an upper electrode through a contact hole or conductive layer, facilitating voltage drop inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the partition wall is miniaturized to improve aperture ratio, then the aperture ratio is improved, but it becomes difficult to form the auxiliary electrode on the top surface of the partition wall
Solution Approach 1:
The auxiliary electrode is repositioned from the top surface of the partition wall to the side surface of the partition wall. This dimensional change allows the auxiliary electrode to be formed without requiring the partition wall to have sufficient top surface area, thus enabling high aperture ratios while maintaining ease of auxiliary electrode formation.
Solution Approach 2:
Instead of forming the auxiliary electrode on top of the partition wall as in conventional structures, the invention inverts the approach by forming the auxiliary electrode on the side surface of the partition wall. This inversion resolves the conflict between miniaturization and auxiliary electrode formation.
2Reliability
If the auxiliary electrode is formed on the top surface of the partition wall, then the voltage drop can be inhibited, but the aperture ratio decreases due to the required width of the auxiliary electrode
Solution Approach 1:
By moving the auxiliary electrode from the top surface to the side surface of the partition wall, the electrode can maintain sufficient width for effective voltage drop inhibition without occupying space that would otherwise contribute to the aperture ratio. The side surface positioning allows the auxiliary electrode to function effectively while being spatially separated from the light-emitting area.
3Area of moving object
If the partition wall is miniaturized, then the aperture ratio is improved, but the electrical connectivity for voltage drop inhibition becomes difficult to achieve
Solution Approach 1:
The auxiliary electrode on the side surface provides an alternative electrical connectivity path that does not depend on the top surface dimensions of the partition wall. This allows effective voltage drop inhibition to be achieved even when the partition wall is miniaturized to improve aperture ratio.
Data Source
AI summary
A display device in which a voltage drop is inhibited is provided. The display device includes a first lower electrode; a second lower electrode; a third lower electrode; an auxiliary electrode; a partition wall including a region overlapping with an end portion of the first lower electrode, an end portion of the second lower electrode, an end portion of the third lower electrode, and the auxiliary electrode; a first light-emitting layer including a region overlapping with the first lower electrode and being positioned in an opening in the partition wall; a first layer positioned between the first lower electrode and the first light-emitting layer; a second light-emitting layer including a region overlapping with the second lower electrode and being positioned in an opening in the partition wall; a second layer positioned between the second lower electrode and the second light-emitting layer; a third light-emitting layer including a region overlapping with the third lower electrode and being positioned in an opening in the partition wall; a third layer positioned between the third lower electrode and the third light-emitting layer; and an upper electrode provided across the first light-emitting layer to the third light-emitting layer, in which the upper electrode is electrically connected to the auxiliary electrode.