COB LED Display Dam Wall Layout to Reduce Total Reflection
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Solution Overview
Problem
The chip on board (COB) process for light emitting diode displays results in total reflection of light due to the disposition of the cover layer, reducing the output light from the displays, which is an ongoing issue in the field.
Innovation Solution
An electronic device design that includes a substrate with light emitting elements, a cover layer, and dam wall units between adjacent light emitting elements, where the dam wall units are strategically positioned to minimize total reflection by satisfying specific geometric and refractive index equations, ensuring the light emitted is not completely reflected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover layer is disposed on the substrate covering the light emitting elements in the COB process, then the light emitting elements are protected and structurally supported, but total reflection of light occurs and the amount of output light is reduced
Solution Approach 1:
The patent introduces dam wall units that divide the space between light emitting elements into multiple regions. These dam walls segment the light propagation paths, preventing total reflection by creating multiple interfaces and scattering light in different directions, thereby increasing light extraction efficiency while maintaining the protective cover layer structure
Solution Approach 2:
The dam wall units act as intermediary structures between the light emitting elements and the cover layer. They serve as light-managing intermediaries that modify the optical path of emitted light, reducing total reflection at the cover layer interface while maintaining the structural integrity provided by the cover layer
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 reduces the likelihood of total reflection, thereby enhancing the display effect and increasing the output light from the electronic device, improving its performance.
Implementation Method 1
the disposition of the cover layer may cause total reflection of light and reduce the amount of output light from the light emitting diode display
Implementation Method 2
the cover layer has a refractive index N1, the medium layer has a refractive index N2
Data Source
AI summary
An electronic device is provided by the present disclosure. The electronic device includes a substrate, a plurality of light emitting elements disposed on the substrate, a cover layer disposed on the substrate and covering the plurality of light emitting elements, and a dam wall unit disposed between adjacent two of the plurality of light emitting elements. The dam wall unit includes a bottom surface adjacent to a top surface of the substrate, and a spacing is included between the bottom surface of the dam wall unit and the top surface of the substrate.