LED Display Microlens Arrays for Bright Room Contrast
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Solution Overview
Problem
Conventional LED display apparatuses suffer from poor bright room contrast due to external light reflection and visible gaps between light sources, which degrade image quality.
Innovation Solution
The use of a microlens array system comprising a first microlens array to redirect light into bundles and a second microlens array to converge light, combined with a light absorbing layer on the second microlens array with openings that correspond to the focuses, reduces reflectivity and increases the perceived number of light sources, thereby improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black mesh structure is disposed in gaps between light emitting diodes to absorb external light, then external light reflection is reduced, but the structure complexity increases and manufacturing difficulty increases
Solution Approach 1:
The patent extracts the light-absorbing function from a complex mesh structure and concentrates it into a focused light absorber positioned only at the focus point of the microlens array. This removes unnecessary structural complexity while maintaining the essential function of absorbing external light that enters through the gaps between LEDs.
Solution Approach 2:
Instead of applying a light-absorbing mesh structure across the entire display surface, the patent applies the light-absorbing element only at the specific location where external light converges (the focus point). This localized approach reduces material usage and structural complexity while effectively addressing the reflection problem at the critical location.
2Ease of manufacture
If light emitting diodes are spaced wider apart, then heat dissipation and manufacturing are improved, but the gaps between light sources become visible and image quality degrades
Solution Approach 1:
The patent combines multiple light rays from a single LED into a focused beam using the microlens array, creating a concentrated light output that appears as a single sharp point. This merging of light paths enhances the perceived image quality and reduces the visibility of gaps between LEDs, allowing for wider spacing while maintaining image quality.
Solution Approach 2:
The patent addresses the gap visibility problem by focusing light in the vertical dimension (creating a sharp focal point) rather than trying to reduce horizontal spacing between LEDs. This dimensional approach allows wider LED spacing while maintaining perceived image quality through precise light focusing.
3Illumination intensity
If a microlens array is added to redirect light into bundles, then light directionality is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent introduces a microlens array as an intermediary optical element between the LEDs and the viewer. This mediator redirects and focuses the light from each LED into a precise bundle, improving light directionality and image quality. The microlens array serves as a simple optical intermediary that achieves the desired light control without requiring complex mechanical or electronic systems.
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 configuration significantly reduces external light reflectivity and enhances image quality by narrowing the perceived gaps between light sources, resulting in improved bright room contrast and higher image quality.
Implementation Method 1
a first microlens array disposed at an upper side of the plurality of light emitting diodes, the first microlens array comprising a plurality of first microlenses, each respective one of which corresponds to a respective one of the plurality of light emitting diodes, and which is configured to redirect light received from the plurality of light emitting diodes into light bundles
Implementation Method 2
a second microlens array disposed at an upper side of the first microlens array, the second microlens array comprising a plurality of second microlenses, a number of which is greater than a number of the first microlenses included in the first microlens array, each of the plurality of second microlenses being configured to cause a convergence of light that has propagated through the first microlens array
Implementation Method 3
a light absorbing layer which is disposed on a surface of the second microlens array upon which focuses of the plurality of second microlenses are formed, and which comprises a plurality of openings that respectively correspond to the focuses of the plurality of second microlenses
Data Source
AI summary
An LED display apparatus includes a plurality of light emitting diodes; a first microlens array disposed at an upper side of the plurality of light emitting diodes, the first microlens array comprising a plurality of first microlenses which corresponds to the plurality of light emitting diodes one-to-one and is configured to combine light received from the plurality of light emitting diodes into light bundles; and a second microlens array disposed at an upper side of the first microlens array, the second microlens array comprising a plurality of second microlenses, a number of which is larger than a number of the first microlenses included in the first microlens array, each of the plurality of second microlenses configured to cause a convergence of light that has propagated through the first microlens array.