Planar Light Source Hole-Embedded Conductive Members
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Solution Overview
Problem
The reliability of electrical connections between light sources and wiring layers in planar light sources is inadequate, leading to potential failures and reduced performance in applications like liquid crystal display backlights.
Innovation Solution
A planar light source design featuring a support member with holes for conductive members to connect electrodes of the light source directly to a wiring layer, ensuring contact with both the lower and lateral surfaces of the electrodes, thereby enhancing the electrical connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light source is disposed on a wiring substrate to be electrically connected to an external circuit, then the light source can be electrically connected, but the reliability of the electrical connection is inadequate
Solution Approach 1:
The conductive member extends vertically through the support member to establish electrical connection between the electrode and wiring layer, transitioning from a planar connection to a three-dimensional structure. This vertical dimension enables reliable electrical connection while maintaining a compact overall design
Solution Approach 2:
The conductive member is disposed within the hole formed in the support member, creating a nested structure where the conductive member is embedded in the support member. This nesting provides mechanical support and stable electrical connection without increasing overall device volume
2Reliability
If conductive members are disposed in holes to connect electrodes and wiring layer, then electrical connection reliability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The hole is formed in the support member before the conductive member is disposed, allowing the conductive member to be precisely positioned and embedded. This preliminary preparation simplifies the subsequent assembly process and ensures accurate alignment for reliable electrical connection
Solution Approach 2:
The conductive member acts as an intermediary element that bridges the electrode and wiring layer through the support member. This mediator enables electrical connection while accommodating the structural requirements of the support member, simplifying the overall manufacturing process
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
This design significantly improves the reliability of electrical connections, reducing the likelihood of failures and maintaining consistent performance by increasing the contact area between electrodes and conductive members, thus stabilizing the light source's operation.
Implementation Method 1
conductive members 61 disposed in first holes 210 and each electrically connecting corresponding one of the electrodes 26 and the wiring layer
Data Source
AI summary
A planar light source includes: a support member that defines a plurality of first holes extending from an upper surface to a lower surface of the support member, wherein the support member comprises a wiring layer disposed at a lower surface side; a light source disposed on the upper surface of the support member, the light source including: a light-emitting element, and a plurality of electrodes disposed on a lower surface of the light-emitting element; and a plurality of conductive members, each of which is disposed in a corresponding one of the first holes and electrically connects a corresponding one of the electrodes and the wiring layer. A lower surface of each of the electrodes is located in the corresponding first hole. Each of the conductive members is in contact with the lower surface and lateral surfaces of the corresponding electrode.