Micro LED Electrode Layer Layout for Reflection and ID Recognition
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Solution Overview
Problem
Existing display devices, particularly those using micro LEDs, face challenges in simplifying the pixel circuit structure, improving light reflection efficiency, and enhancing module and cell ID recognition rates, while minimizing passivation layer lifting.
Innovation Solution
A display device with a substrate and pixel driving circuits, where a first electrode serves as a reflective plate, and conductive layers with high reflection efficiency are exposed to enhance light reflection and recognition, and an adhesive characteristic is improved to prevent passivation layer lifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first electrode is formed with multiple conductive layers, then the reflection efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The first electrode is designed as a multi-layer conductive structure where the second conductive layer with high reflection efficiency is integrated between the first and third conductive layers. This merging of multiple functional layers into a single electrode structure achieves both electrical connection and light reflection functions simultaneously, improving reflection efficiency while maintaining manufacturing feasibility through integrated processing.
Solution Approach 2:
The first electrode serves multiple functions: it provides electrical connection between the micro LED and pixel driving circuit, acts as a reflective plate to redirect light, and forms alignment keys and cell IDs for module identification. By making the electrode multi-functional, the patent reduces the need for separate components, thereby improving reflection efficiency without proportionally increasing structural complexity.
2Measurement precision
If the second conductive layer is exposed from the third and fourth conductive layers, then the recognition rate of module alignment key and cell ID is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The second conductive layer is selectively exposed only at specific locations where alignment keys and cell IDs are required, rather than being exposed throughout the entire electrode structure. This local exposure approach improves recognition rate by making identification features visible while minimizing the impact on overall manufacturing precision requirements by maintaining coverage in other critical areas.
Solution Approach 2:
The alignment keys and cell IDs are formed during the electrode formation process itself, utilizing the exposed second conductive layer as identification features. By preparing these recognition features in advance during the same manufacturing process, the patent improves recognition rate without requiring additional post-processing steps that would increase precision requirements.
3Stability of the object's composition
If the adhesive characteristic between cell ID, module alignment key and passivation layer is improved, then the lifting of passivation layer is minimized, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs a multi-layer conductive structure with different materials optimized for specific functions. The second conductive layer with high reflection efficiency is combined with other conductive layers that provide structural support and electrical connection. This composite structure inherently improves adhesive characteristics between layers while maintaining manufacturing feasibility through established multi-layer deposition techniques.
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 solution simplifies the pixel circuit structure, enhances luminance through efficient light reflection, improves module and cell ID recognition rates, and minimizes passivation layer defects.
Implementation Method 1
the second conductive layer which is formed of a material having excellent reflection efficiency, among the plurality of conductive layers of the first electrode is exposed to be used as a reflective plate which reflects light emitted from the micro LED to the top of the substrate
Data Source
AI summary
A display device and a mother substrate for the display device are discussed. The display device can include a substrate, one or more pixel driving circuits disposed on a substrate, micro LEDs electrically connected to the pixel driving circuits, and first electrodes electrically connected to the micro LEDs and the pixel driving circuits. Each of the first electrodes includes first to fourth conductive layers. Further, at least a part of a top surface of the second conductive layer is exposed from the third and fourth conductive layers. Accordingly, the second conductive layer which includes a material having excellent reflection efficiency is exposed to be used as a reflective plate which reflects light emitted from the micro LED to the top of the substrate.