Display Pad Dummy Pattern Layout for Reliable LED Connections
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Solution Overview
Problem
Current display devices face challenges in achieving enhanced reliability due to limitations in the fabrication methods and structural components, particularly in the integration of light emitting elements and electrical connections, which affect the overall performance and durability of the display.
Innovation Solution
A display device design that includes a substrate with a display area and a non-display area, featuring a transistor, conductive patterns, a via layer, alignment electrodes, light emitting elements, and pads, along with a dummy pattern and passivation layers, optimized through specific fabrication steps such as photolithography and dry etching to enhance electrical connections and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fabrication methods are used for integrating light emitting elements and electrical connections, then the manufacturing process is simpler, but the reliability and performance of the display device are insufficient
Solution Approach 1:
The fabrication process is divided into multiple sequential steps including forming conductive patterns, forming via layers with contact holes, forming alignment electrodes, forming light emitting elements, and forming electrical connections. Each step is independently controlled to ensure precision and reliability while managing overall complexity.
Solution Approach 2:
Alignment electrodes are formed before the light emitting elements to establish precise positional references. Conductive patterns and via layers are prepared in advance with predetermined configurations to ensure proper electrical connections are achieved during subsequent assembly steps.
2Reliability
If conventional electrical connection structures are used, then the device structure is simpler, but the light emission efficiency and structural integrity are reduced
Solution Approach 1:
The electrical connection structure employs a nested configuration where conductive patterns are embedded within insulating layers, via layers with contact holes are formed within the insulating layers, and alignment electrodes are positioned within designated areas. This nested structure ensures structural integrity while maintaining electrical functionality.
Solution Approach 2:
Via layers with contact holes serve as intermediary structures that electrically connect the conductive patterns to the alignment electrodes and light emitting elements. The via layers bridge different structural levels, ensuring both electrical connectivity and mechanical stability.
3Productivity
If precise alignment and electrical connections are achieved through detailed fabrication steps, then the light emission efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
Alignment electrodes are formed with predetermined patterns and positions before the light emitting elements are introduced. This preliminary alignment structure enables precise positioning of light emitting elements during assembly, ensuring optimal light emission efficiency without requiring complex real-time alignment procedures.
Solution Approach 2:
The alignment electrodes and conductive patterns are designed with self-aligning features that guide the positioning of light emitting elements during assembly. The predetermined configurations of via layers and contact holes automatically facilitate proper electrical connections when components are assembled according to the established structure.
Data Source
AI summary
A display device may include: a substrate including a display area and a non-display area, the non-display area including a pad area; a transistor and a conductive pattern on the substrate in the display area; a via layer on the transistor and the conductive pattern to cover the transistor and the conductive pattern; a first alignment electrode and a second alignment electrode on the via layer; a light emitting element between the first and second alignment electrodes; a first electrode and a second electrode that are spaced from each other, and electrically connected to the light emitting element; a plurality of pads on the substrate in the pad area; and a dummy pattern on the substrate in the pad area, and spaced from the plurality of pads. The via layer and the dummy pattern may include a same material.