Micro Lens Partition Walls for Image Display Light Extraction
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Solution Overview
Problem
Existing image display devices with micro light emitting elements suffer from low light emission efficiency due to low light extraction efficiency, leading to increased power consumption and heat generation, as well as inefficient light distribution, with excess light being emitted in unintended directions.
Innovation Solution
The implementation of micro lenses with inclined reflection surfaces and partition walls around them to redirect light emitted by micro light emitting elements, enhancing light output in the forward direction and reducing leakage to adjacent elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If micro light emitting elements are used in an image display device, then the device size can be reduced and high brightness is achieved, but light emission efficiency becomes low due to low light extraction efficiency
Solution Approach 1:
The invention divides the light extraction problem into two separate functional components: a micro lens array for light collection and focusing, and a reflection layer for redirecting light. This segmentation allows each component to optimize its specific function, with the micro lenses capturing light in specific angular ranges and the reflection layer redirecting otherwise lost light, thereby improving overall light extraction efficiency without increasing device size
Solution Approach 2:
The invention introduces a reflection layer as an intermediary between the micro light emitting elements and the external environment. This reflection layer acts as a mediator that intercepts light attempting to escape at large angles and redirects it toward the forward direction, effectively converting what would be lost light into useful output and improving light emission efficiency
2Loss of energy
If light extraction efficiency is improved by adding micro lenses and reflection layers, then light emission efficiency increases, but device complexity increases
Solution Approach 1:
The micro lens array serves multiple functions simultaneously: it acts as a light collection element, a focusing element, and a directional control element. The reflection layer also performs multiple roles by redirecting light and defining the angular emission profile. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved light emission efficiency
Solution Approach 2:
The invention optimizes light extraction by changing the angular distribution parameter of emitted light. The micro lenses and reflection layer work together to transform the isotropic emission pattern into a more directional forward-emission pattern, effectively changing the emission angle parameter to improve efficiency without requiring fundamental structural overhauls
3Illumination intensity
If micro light emitting elements emit light in a wide angular distribution, then light coverage is increased, but light is not effectively used and power consumption increases
Solution Approach 1:
The invention applies local quality control by using micro lenses with specific focal lengths and aperture angles tailored to redirect light from specific angular regions. Each micro lens is designed to collect light within a specific angular range and redirect it to a specific direction, creating localized optimization of light distribution that improves overall energy efficiency while maintaining adequate light coverage
Solution Approach 2:
The invention changes the emission angle parameter from a wide isotropic distribution to a more concentrated forward-directed distribution. By adjusting the micro lens aperture angles and reflection layer geometry, the system transforms the angular emission profile to concentrate light in the forward direction, improving the effective use of light energy and reducing power consumption
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 improves light emission efficiency by redirecting light emitted at large angles towards the forward direction, reducing power consumption and heat generation, and enhancing the brightness of the image display device.
Implementation Method 1
A side surface of each of the plurality of partition walls facing a corresponding one of the plurality of micro lenses is inclined so as to open in a light emission direction and is a reflection surface that reflects light
Data Source
AI summary
An image display device includes: a plurality of micro light emitting elements arranged in an array shape; a driving circuit substrate including a driving circuit that supplies electric current to the plurality of micro light emitting elements and that causes the plurality of micro light emitting elements to emit light; a plurality of micro lenses in contact with light emitting surfaces of the plurality of micro light emitting elements; and a plurality of partition walls disposed around the plurality of micro lenses in a direction parallel to the light emitting surfaces.