Display Electrode Stack Layout for Light Reflection and Contact Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in efficiently reflecting light emitted by light-emitting elements while maintaining low resistance and preventing contact errors between electrodes from different layers or lines.
Innovation Solution
The display device incorporates electrodes with a stack structure that includes an electrode base layer, a main electrode layer, and an electrode upper layer, where the electrode upper layer is not disposed in certain areas, allowing the main electrode layer to directly contact the insulating layer and reflect light effectively. This design ensures low resistance and accurate electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode upper layer is disposed over the main electrode layer, then contact reliability between electrodes from different layers is improved, but light reflection efficiency deteriorates
Solution Approach 1:
The electrode structure is segmented into different regions: a first region where the upper layer is removed to enable light reflection, and a second region where the upper layer is retained to ensure reliable electrical contact. This spatial segmentation resolves the contradiction by allowing both functions to coexist in different locations of the same electrode structure.
Solution Approach 2:
Different regions of the electrode are given different local qualities: the first region has a reflective quality (upper layer removed) while the second region has a conductive quality (upper layer retained). This local differentiation allows the electrode to simultaneously achieve light reflection and contact reliability in their respective areas.
2Illumination intensity
If the electrode upper layer is removed in certain areas, then light reflection efficiency is improved, but contact reliability between electrodes deteriorates
Solution Approach 1:
The electrode contact structure is segmented into a first contact region (where upper layer is removed for light reflection) and a second contact region (where upper layer is retained for reliable contact). This segmentation ensures that light reflection and contact reliability are achieved in their respective designated areas without compromising either function.
Solution Approach 2:
The electrode structure implements local quality differentiation by removing the upper layer only in specific first contact regions while retaining it in second contact regions. This localized approach allows optimal light reflection where needed while maintaining reliable electrical contact where required.
3Illumination intensity
If the main electrode layer directly contacts the insulating layer, then light reflection is enhanced, but resistance increases
Solution Approach 1:
The electrode structure is segmented into a first part (main electrode layer directly contacting insulating layer for light reflection) and a second part (electrode upper layer present for low resistance). This segmentation allows the structure to achieve both light reflection enhancement and low resistance by distributing different functions to different parts.
Solution Approach 2:
Different local qualities are assigned to different parts of the electrode: the first part has a reflective quality (direct contact with insulating layer) while the second part has a conductive quality (upper layer for low resistance). This local differentiation resolves the contradiction between light reflection and resistance.
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
The proposed solution effectively reflects light emitted by light-emitting elements in an upward direction, maintains low resistance without contact errors, and enhances the overall performance of the display device.
Implementation Method 1
The main electrode layer may include aluminum (Al), and the electrode base layer and the electrode upper layer may include titanium (Ti) or molybdenum (Mo). In the first part and the second part, the main electrode layer may directly contact the first insulating layer.
Data Source
AI summary
A display device includes a first electrode and a second electrode spaced apart from each other, each of the first electrode and the second electrode including an electrode base layer, a main electrode layer disposed on the electrode base layer, and an electrode upper layer disposed on a portion of the main electrode layer, a first insulating layer disposed on the first electrode and the second electrode, light-emitting elements disposed on the first electrode and the second electrode on the first insulating layer, a first connecting electrode electrically contacting the light-emitting elements, and a second connecting electrode electrically contacting the light-emitting elements. The first electrode includes a first part, the second electrode includes a second part, and the light-emitting elements are disposed on the first part and the second part.