Transparent Display Wiring Layout for Reliable Pad Connections
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving a thin, lightweight, and low-power design, particularly with organic light-emitting displays that are vulnerable to moisture and oxygen, leading to defective pixels, and require complex manufacturing processes.
Innovation Solution
A transparent display apparatus with a wiring substrate and display part connected via a conductive pattern, allowing for simplified manufacturing by omitting processes like through-electrode formation and enabling easy repair of signal communication failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If organic light-emitting display apparatus is used to achieve thin and lightweight design, then the display apparatus can be thinner and more flexible, but the reliability deteriorates due to vulnerability to moisture and oxygen causing defective pixels
Solution Approach 1:
The display apparatus is divided into separate modules: a wiring substrate and a display part that can be bonded together. This segmentation allows the display part to be optimized for thinness while the wiring substrate provides robust electrical connections, resolving the contradiction between thinness and reliability.
Solution Approach 2:
A conductive pattern is introduced as an intermediary element to electrically connect the wiring substrate and the display part. This intermediary connection method is more reliable than direct bonding, as it provides a dedicated conductive path that is less susceptible to moisture and oxygen infiltration, thereby improving pixel reliability while maintaining thinness.
2Reliability
If complex manufacturing processes are used to ensure reliable electrical connection, then the electrical connection reliability is improved, but the production energy consumption and manufacturing complexity increase
Solution Approach 1:
The conductive pattern is formed on the wiring substrate before bonding to the display part. This preliminary action ensures that reliable electrical connections are established in advance, eliminating the need for complex post-bonding alignment and connection processes, thereby reducing manufacturing complexity while maintaining connection reliability.
Solution Approach 2:
The conductive pattern is formed using printing methods that can accurately replicate the required electrical connection geometry. This copying approach simplifies the manufacturing process by using straightforward deposition techniques rather than complex through-electrode formation, reducing both manufacturing complexity and energy consumption.
3Reliability
If traditional through-electrode formation process is used to ensure electrical connection, then the electrical connection is reliable, but the manufacturing process complexity and production energy consumption increase
Solution Approach 1:
The traditional mechanical through-electrode formation process is replaced with a conductive pattern deposition process. This substitution eliminates the need for drilling, plating, and filling operations, significantly reducing production energy consumption while maintaining reliable electrical connections through the printed conductive patterns.
4Area of stationary object
If large area display part is used to increase display area, then the display area is increased, but the transparency is reduced due to increased wiring and conductive elements
Solution Approach 1:
The conductive pattern is designed with locally optimized properties: it is placed only where electrical connections are needed, and its thickness and material composition are adjusted locally to minimize optical interference. This allows large display areas to maintain high transparency by concentrating conductive elements only in necessary regions rather than uniformly across the entire area.
Data Source
AI summary
A display apparatus in one example includes a wiring substrate having a plurality of link lines, a display part disposed on the wiring substrate, the display part including a plurality of light-emitting elements and a plurality of signal lines, a first pad electrode overlapping an end of the plurality of link lines, a second pad electrode overlapping an end of the plurality of signal lines, and a conductive pattern electrically connected to the first pad electrode and the second pad electrode.