Mini LED Display Light-Emitting Array With Color Conversion Points
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Solution Overview
Problem
Existing mini LED light panels suffer from uneven brightness, leading to dark regions or strip-like defects (mura defects) between adjacent light-emitting diodes, which reduces color and brightness uniformity.
Innovation Solution
A light-emitting device is designed with a substrate, a light-emitting array, and a plurality of first color conversion points. The light-emitting array consists of light-emitting units with LED dies and encapsulating portions, while the color conversion points, made of a wavelength conversion material, surround the array to enhance brightness and color uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If mini LED light panels are used to reduce size, then the device size is reduced, but brightness uniformity deteriorates due to dark regions and strip-like defects between adjacent LEDs
Solution Approach 1:
The patent introduces a light guiding structure as an intermediary component between adjacent light-emitting units. This structure includes a light guiding portion that redirects light from brighter regions toward darker regions, and a reflective portion that reflects light to compensate for dark areas. The intermediary structure mediates the light distribution to achieve uniform brightness while maintaining the mini LED format.
2Area of stationary object
If adjacent light-emitting diodes are placed close together to reduce size, then device compactness is improved, but dark regions and strip-like defects appear between them
Solution Approach 1:
The patent converts the harmful dark regions and strip-like defects into beneficial light distribution patterns. The light guiding structure captures light that would otherwise create brightness non-uniformity and redirects it to areas needing illumination. The reflective portion similarly converts stray light into useful illumination, transforming the harmful effect of adjacent LED placement into a benefit for overall brightness uniformity.
3Illumination intensity
If light guiding structures are added to improve brightness uniformity, then color and brightness uniformity are enhanced, but device complexity increases
Solution Approach 1:
The patent applies local quality by positioning light guiding structures specifically at regions where brightness non-uniformity occurs, rather than uniformly across the entire device. The light guiding portions are strategically placed to redirect light to dark regions, and reflective portions are positioned to address specific strip-like defects. This localized approach achieves brightness uniformity enhancement while minimizing the overall structural 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 solution effectively improves color and brightness uniformity by compensating for light emitted from the light-emitting units and reducing dark regions or strip-like defects, thereby enhancing the overall performance of the light-emitting device and display devices.
Implementation Method 1
The plurality of first color conversion points includes a first wavelength conversion material
Data Source
AI summary
A light-emitting device and a display device are provided. The light-emitting device includes a substrate, a light-emitting array, and a plurality of first color conversion points. The light-emitting array is disposed on the substrate and includes a plurality of light-emitting units. Each one of the plurality of light-emitting units includes a LED die and an encapsulating portion. The LED die is disposed on the substrate. The encapsulating portion is disposed on the substrate and covers the LED die. The plurality of first color conversion points is disposed on the substrate and surrounds the light-emitting array. The plurality of first color conversion points includes a first wavelength conversion material.