LED Light-Emitting Region Layout for Uniform Luminance Coating
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Solution Overview
Problem
Existing light emitting devices using LEDs face challenges in achieving uniform luminance characteristics due to variations in the coating amount of LED solutions during fabrication.
Innovation Solution
A light emitting device is designed with a base substrate, unit regions, barriers, dams, first and second electrodes, and bar type LEDs. The method involves preparing the base substrate, forming electrodes and dams, coating an LED solution, and controlling the amount of the solution to ensure uniform distribution within the unit regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coating amount of LED solution is not controlled, then the fabrication process is simple, but the luminance characteristics become non-uniform
Solution Approach 1:
The device divides the unit region into two functional structures: a dam that defines the light emitting region and a barrier that surrounds the dam. This segmentation allows precise control of LED solution coating within the dam region, ensuring uniform luminance while maintaining a manageable structural complexity through modular design elements.
Solution Approach 2:
The dam and barrier structures create localized control zones within the unit region. The dam with its specific height and the barrier spaced at a predetermined distance establish a defined space that controls where the LED solution is deposited, ensuring uniform distribution locally without requiring complex global control mechanisms.
2Quantity of substance
If the amount of LED solution is increased, then more bar type LEDs are deposited, but the variation in number of LEDs increases
Solution Approach 1:
The dam structure is formed in advance with a specific height before LED solution coating. This preliminary action defines the maximum volume available for LED solution deposition, ensuring that regardless of the total solution amount applied, the LEDs are confined to a controlled region with uniform distribution characteristics.
Solution Approach 2:
The dam acts as an intermediary structure between the LED solution coating process and the final LED distribution. By controlling the dam height and the spacing between the dam and barrier, the invention mediates the relationship between solution quantity and LED number, ensuring uniform deposition without direct proportionality to total solution amount.
3Volume of stationary object
If the dam height is increased, then more LED solution can be contained, but the manufacturing complexity increases
Solution Approach 1:
The dam height is set to a specific minimum threshold (equal to or greater than the barrier height) that is sufficient to contain the LED solution and achieve uniform LED distribution, but not excessively high to create unnecessary manufacturing complexity. This partial action approach uses just enough structure to solve the problem without over-engineering.
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
The solution achieves uniform luminance characteristics and improved visibility by controlling the amount of the LED solution within each unit region, thereby minimizing variations in the number of bar type LEDs and ensuring consistent light emission.
Implementation Method 1
At least a surface of the dam may have hydrophilicity
Implementation Method 2
At least a surface of the barrier may have hydrophobicity
Data Source
AI summary
A light emitting device includes: a base substrate; a plurality of unit regions provided on the base substrate; a barrier disposed at a boundary of the unit regions to surround each of the unit regions; a dam disposed in each of the unit regions to be spaced apart from the barrier; a first electrode provided in each of unit light emitting regions surrounded by the dam; a second electrode disposed in each of the unit light emitting regions, the second electrode of which at least one region is provided opposite to the first electrode; and one or more LEDs provided in each of the unit light emitting regions, the one or more LEDs being electrically connected between the first electrode and the second electrode.