Display Electrode Contact Structure for Lower Resistance and Heat
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Solution Overview
Problem
Display devices face issues with contact resistance and heat-related problems due to high contact resistance at the contact portion, leading to luminance degradation.
Innovation Solution
A display device design with a specific structure including contact electrodes, interlayer insulation layers, passivation layers, and connection electrodes, where the connection electrodes are in contact with the contact electrodes through openings in the insulation layers, minimizing contact resistance and addressing heat issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection electrodes contact contact electrodes through openings in insulation layers, then contact resistance is reduced, but device complexity increases
Solution Approach 1:
The device is divided into multiple functional layers including interlayer insulation layer, passivation layer, and first insulation layer, each serving specific purposes. The contact portion penetrates through selected insulation layers to establish electrical connection, while other insulation layers remain intact to provide protection and insulation, thus reducing contact resistance without unnecessary complexity
Solution Approach 2:
Different regions of the device have different structural characteristics. The contact portion area has reduced insulation layer thickness or removed insulation layers to enable electrical contact, while other areas maintain complete insulation layers for protection. This localized differentiation optimizes both electrical performance and structural integrity
2Ease of manufacture
If contact resistance is high at contact portion, then manufacturing is simpler, but heat-related problems and luminance degradation occur
Solution Approach 1:
The electrical conductivity parameter at the contact portion is improved by modifying the insulation layer structure - either reducing thickness or removing insulation layers in the contact area. This parameter change reduces contact resistance and consequently reduces heat generation, while the manufacturing process remains feasible through standard etching and deposition techniques
Data Source
AI summary
A display device includes contact electrodes on a substrate; an interlayer insulation layer on the contact electrodes; a passivation layer on the interlayer insulation layer; pixel electrodes on the passivation layer; a first insulation layer on the pixel electrodes; light emitting elements between the pixel electrodes; and connection electrodes electrically connected to the light emitting elements, wherein the passivation layer and/or the first insulation layer include an opening exposing the interlayer insulation layer, and the connection electrodes are in contact with the contact electrodes through a contact portion penetrating the interlayer insulation layer exposed by the opening.