Pad Structure Sharing Material with Bank in Display Device
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Solution Overview
Problem
Current display devices face challenges in efficiently integrating light emitting layers and electrodes due to the need for precise material deposition and patterning, which can lead to inefficiencies in light emission and increased complexity in manufacturing processes.
Innovation Solution
The display device incorporates a bank structure with alternating metal layers, including aluminum and titanium, and a pad structure with matching materials, allowing for the deposition and etching of light emitting layers and electrodes without the use of masks, simplifying the manufacturing process and improving light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mask processes are used for depositing light emitting layers and electrodes, then precise patterning can be achieved, but manufacturing complexity and process time increase
Solution Approach 1:
The patent removes the mask layer from the conventional deposition process. Instead of depositing material through a mask pattern, the light emitting layer and electrode are deposited as continuous layers, and the bank structure is used to define the emission areas by selective removal or blocking, thereby eliminating mask-related complexity while maintaining patterning precision
Solution Approach 2:
The patent inverts the conventional approach by making the bank structure the primary patterning element rather than using masks during deposition. The bank structure with its specific refractive index and geometry defines the emission areas, and materials are deposited uniformly without masks, reversing the traditional sequence of patterning operations
2Reliability
If multiple metal layers with different materials are used in bank and pad structures, then electrical connectivity and structural integrity are improved, but manufacturing process becomes more complex
Solution Approach 1:
The patent designs the bank structure and pad structure to serve multiple functions simultaneously. The multi-layer metal structure provides both mechanical support and electrical connectivity functions. The same material stack (Aluminum and Titanium layers) is used in both bank and pad structures, allowing uniform processing while achieving different functional requirements through geometric configuration rather than material differentiation
Solution Approach 2:
The patent controls the thickness and material composition parameters of each layer to optimize both electrical and mechanical properties. By adjusting layer thicknesses and material properties rather than adding more complex layers, the structure achieves improved connectivity and integrity without proportionally increasing manufacturing complexity
3Use of energy by moving object
If bank structure with specific refractive index is used to define emission areas, then light emission efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the refractive index parameter of the bank structure material to enhance light emission efficiency. By selecting materials with appropriate refractive indices and controlling layer thicknesses, the structure achieves improved light extraction and emission efficiency while maintaining manufacturable tolerance ranges, avoiding excessive precision requirements
Data Source
AI summary
A display device includes a display area and a pad area. Pixel electrodes are disposed in the display area. An inorganic insulating layer is disposed in the display area and partially on the pixel electrode. A bank structure is disposed on the inorganic insulating layer. A pad structure is disposed in the pad area and is electrically connected to a fan-out line disposed in the pad area and the display area. Light emitting layers are disposed on the pixel electrodes and in openings of the bank structure. Common electrodes are disposed on the light emitting layers and in the openings of the bank structure. The bank structure includes multiple first bank layers including different metal materials. One of the bank layers and the pad layer includes a tip protruding from a sidewall thereof.