LED Display Microlens Arrays for Bright Room Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED display apparatuses suffer from poor bright room contrast due to external light reflection, which reduces image quality, and the wide spacing between light sources makes them recognizable, further degrading 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 of the second microlenses, reduces reflectivity and narrows the spacing between light sources, enhancing contrast and image quality.
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 reflectivity from gaps is reduced, but reflectivity from light emitting diode surfaces remains high and bright room contrast is still poor
Solution Approach 1:
The invention divides the light control function into multiple segments: the black mesh structure segments the gaps between LEDs to absorb external light, while additional light-absorbing structures segment the LED surfaces themselves to prevent reflection from the dome-shaped lenses, achieving comprehensive reflection reduction
Solution Approach 2:
The invention applies different treatments to different locations: the gaps between LEDs receive the black mesh structure for light absorption, while the LED surfaces receive additional light-absorbing materials or structures, creating location-specific solutions for reflection control at each critical surface
2Manufacturing precision
If distances between adjacent light emitting diodes are reduced to prevent dot recognition, then spacing between light sources decreases, but manufacturing complexity and cost increase
Solution Approach 1:
The invention introduces optical elements (microlenses, light guides, or reflectors) as intermediaries between the LEDs and the viewer. These intermediaries optically mix or redistribute the light from adjacent LEDs, creating a uniform appearance that masks the physical spacing between individual light sources, thereby allowing larger LED pitch without dot recognition
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 improves bright room contrast by minimizing the area reflecting external light, resulting in higher image quality and a more uniform display.
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; 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, 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 2
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
Figure 1~3
Figure 4~5
Figure 6a~7
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.