Microchip Matrix Light Source Module Reducing Optical Cross-Talk
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Solution Overview
Problem
Microchip array LEDs face issues with optical cross-talk due to lateral light emission, which degrades color saturation and reduces energy efficiency, as existing solutions either absorb lateral light or fail to effectively redirect it.
Innovation Solution
The implementation of a microchip matrix light source module with tapered side portions covered by a light refractive layer and interposed light reflectors or light benders to redirect laterally emitted light, combined with a light absorption layer to manage backscattered light, thereby reducing optical cross-talk and enhancing collimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an array of microlenses is formed on LED devices to focus light to a focal point, then light energy efficiency is improved, but lateral light emission causes optical cross-talk between nearby LED devices
Solution Approach 1:
A light absorber is introduced as an intermediary component positioned between adjacent LED devices. This light absorber selectively absorbs lateral light emitted by LED devices, preventing it from reaching neighboring LEDs and causing optical cross-talk. The light absorber maintains the beneficial light focusing function while eliminating the harmful lateral light interference.
Solution Approach 2:
The side surfaces of LED devices are selectively modified with different properties than their top surfaces. The light absorber is positioned specifically at lateral regions where cross-talk occurs, while the top surfaces maintain their light-emitting and focusing functions. This localized modification addresses the cross-talk problem without affecting the primary light emission function.
2Object-generated harmful factors
If an opaque material is filled between LED devices to absorb lateral light emissions, then optical cross-talk is reduced, but lateral light energy cannot be used for display and energy efficiency is lowered
Solution Approach 1:
The optical properties of the material between LED devices are changed from completely opaque (absorbing all light) to selectively absorbing only lateral light wavelengths or directions. This parameter change allows the material to block harmful lateral light while potentially transmitting or reflecting useful light paths, thereby reducing cross-talk without completely sacrificing light energy for display purposes.
3Illumination intensity
If LED devices emit light laterally to nearby LED devices, then light distribution is enhanced, but color saturation is degraded due to optical cross-talk
Solution Approach 1:
The light absorber acts as a mediator that selectively removes lateral light components responsible for color contamination between adjacent LEDs. By absorbing these interfering lateral emissions, the light absorber preserves the color purity and saturation of each LED device while still allowing the desired light distribution function to operate through the microlens focusing mechanism.
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 effectively reduces optical cross-talk and improves energy efficiency by redirecting lateral light emissions towards the observer, maintaining normal light emission pathways while absorbing backscattered light, resulting in improved collimated light output and reduced energy loss.
Implementation Method 1
The LED device has a tapered side portion, covered in part or in whole, with a light refractive layer
Implementation Method 2
a light reflector formed on a surface upon which the LEDs are formed and interposed between the LEDs and configured to reflect and thereby redirect laterally emitted light from the two LEDs
Implementation Method 3
combined with a light absorption layer to manage backscattered light, thereby reducing optical cross-talk
Data Source
AI summary
A microchip matrix light source module includes at least two LEDs formed on a surface of a substrate. The light source further includes a light reflector formed on a surface upon which the LEDs are formed and interposed between the LEDs and configured to reflect and thereby redirect laterally emitted light from the two LEDs. The light reflector may include an inner body. The body may be covered, in part or in whole, with a light reflecting layer such as a metal layer. The body of the light reflector may include a layer corresponding to a layer in one of the two LEDs.