Reflective Conductor Track Transfer for Flexible Light Emitters
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Solution Overview
Problem
The manufacturing of light-emitting devices using conventional methods is costly and environmentally unfriendly due to the use of chemical etching processes, slow curing times, and material inefficiencies in polymer mask application, which also limits the flexibility and design freedom of the devices.
Innovation Solution
A method involving a foil transfer process to form a reflective coating directly on conductor tracks, allowing for a thinner, more defined, and highly reflective coating that covers conductor tracks while leaving contact pads exposed, enabling better adhesion and improved manufacturing efficiency with reduced material usage and thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer mask is applied using screen printing or exposure and development process, then the solder alloy is prevented from flowing uncontrollably, but the manufacturing cost increases and the process becomes slow
Solution Approach 1:
The patent extracts the mask layer from the conventional polymer mask application process. Instead of applying a thick polymer mask through slow screen printing or exposure processes, a thin mask layer is transferred directly from a transfer foil during the lamination process, dramatically reducing manufacturing time while maintaining solder joint quality
Solution Approach 2:
The patent replaces the conventional polymer mask application system (screen printing or exposure equipment) with a foil transfer system that uses heat and pressure during lamination to transfer the mask pattern directly onto the substrate, eliminating the need for separate mask application equipment and processes
2Reliability
If a thick polymer mask layer is applied to prevent solder flow, then solder containment is improved, but material cost and application cost increase
Solution Approach 1:
The patent uses a thin mask layer formed on a transfer foil that is subsequently transferred to the substrate. This thin film approach replaces the conventional thick polymer mask layer, reducing material consumption while maintaining effective solder containment through the transfer lamination process
Solution Approach 2:
The patent changes the thickness parameter of the mask layer from thick (conventional polymer mask) to thin (transferred mask layer). This parameter change reduces material cost and application cost while maintaining the functional requirement of preventing solder alloy from flowing uncontrollably
3Manufacturing precision
If chemical etching is used to create conductor tracks on metal foil, then precise circuit patterns are achieved, but environmental pollution and disposal costs increase
Solution Approach 1:
The patent extracts and removes the chemical etching process from the manufacturing sequence. Instead of chemically etching metal foil, the conductor tracks are created through a foil transfer process that uses heat and pressure to transfer the circuit pattern directly, eliminating chemical waste generation
Solution Approach 2:
The patent converts the harmful chemical etching process into a beneficial thermal transfer process. The heat and pressure applied during lamination, which could potentially cause damage, are instead used to transfer the mask and conductor patterns cleanly without chemicals, turning a potentially harmful process into an environmentally friendly one
4Manufacturing precision
If the film is pulsed and held stationary for exposure, then mask application precision is improved, but processing time increases and yield decreases
Solution Approach 1:
The patent enables continuous lamination and transfer processing without pulsing or stopping the film. The foil transfer process maintains continuous motion while transferring the mask pattern, eliminating idle time between exposure steps and dramatically increasing production speed and yield
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 approach reduces manufacturing costs, enhances the luminous efficiency of light-emitting devices, improves mechanical flexibility, and allows for more design freedom while being environmentally friendly by eliminating the need for extensive chemical etching and UV curing adhesives.
Implementation Method 1
forming a reflective coating directly on the at least one conductor track by means of a foil transfer process such that the conductor track is substantially covered by the reflective coating
Data Source
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AI summary
A method for manufacturing a light-emitting device is provided. The method involves: producing a support (102) having at least one conductor track (104, 114, 124) on a surface of the support (102); producing a reflective coating (106) directly on the at least one conductor track (104, 114, 124) by means of a film transfer method such that the conductor track (104, 114, 124) is substantially covered by the reflective coating (106); and arranging a light-emitting component (108) on or above the reflective coating (106), wherein the light-emitting component (108) is electrically conductively connected to the at least one conductor track (104, 114, 124).