LED Sidewall Groove Structure for Clear Cutoff Lines
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Solution Overview
Problem
Light emitting apparatuses face issues with light spreading phenomena on side surfaces, leading to unclear cutoff lines and potential obstruction of views in vehicle lamps and non-uniform backlights in displays, necessitating a solution to prevent light from spreading to adjacent areas.
Innovation Solution
A light emitting apparatus design featuring a substrate with light emitting diode chips, light transmission layers, and a sidewall portion with strategically placed grooves that prevent light from transmitting through the sidewall, including a first groove with a narrower width and depth, and a second groove with a different extension length, to control light distribution and reduce spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting diode chips are arranged closely to increase luminance, then light output is improved, but light spreading to adjacent areas occurs causing unclear cutoff lines and view obstruction
Solution Approach 1:
The patent introduces grooves that divide the sidewall region into separate segments, creating physical barriers between adjacent light emitting diode chips. These grooves segment the light propagation paths and prevent cross-contamination of light between neighboring chips, thereby maintaining clear cutoff lines while preserving high luminance output.
Solution Approach 2:
The grooves act as intermediary structures positioned between adjacent light emitting diode chips. These intermediary grooves intercept and block light that would otherwise spread to adjacent areas, serving as a mediating element that allows close chip arrangement for high luminance while preventing harmful light spreading.
2Object-affected harmful factors
If sidewall structure is added to prevent light spreading, then light control is improved, but device complexity increases
Solution Approach 1:
Instead of implementing a complex overall sidewall structure, the patent applies grooves only at specific local positions where light spreading occurs between adjacent chips. This localized approach provides effective light control precisely where needed without adding unnecessary complexity to the entire device structure.
Solution Approach 2:
The patent controls light spreading by adjusting parameters of the grooves such as depth, width, and positioning, rather than adding complex structural elements. By optimizing these geometric parameters, effective light control is achieved with minimal structural additions, thereby reducing overall device complexity.
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 design effectively prevents light from spreading to adjacent areas, maintaining clear boundaries and ensuring uniform light distribution, thereby enhancing visibility and luminance in vehicle lamps and displays.
Implementation Method 1
a first groove and a second groove disposed on an upper surface of at least a portion of the sidewall portion, in which the first groove has a width narrower than a shortest width from at least one nearest light transmission layer to the first groove
Implementation Method 2
a sidewall portion surrounding the plurality of light emitting diode chips and the plurality of light transmission layers
Data Source
AI summary
A light-emitting device according to one embodiment of the present invention comprises: a substrate; a plurality of light-emitting diode chips positioned on the substrate; a plurality of light-transmitting layers positioned on the top surfaces of the plurality of light-emitting diode chips; a sidewall portion surrounding the plurality of light-emitting diode chips and the plurality of light-transmitting layers; and a first groove positioned on the top surface of at least a portion of the sidewall portion positioned between the light-transmitting layers, wherein the first groove has a width smaller than a shortest width from an adjacent light-transmitting layer to the first groove and has a depth smaller than the thickness of the closest light-transmitting layer.