Micro LED Array Groove Structure for Stray Light Isolation
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Solution Overview
Problem
Conventional LED arrays with micro LED elements suffer from stray light emission that causes false glowing in non-light-emitting pixels, leading to inaccurate image presentation due to light reflection from side walls of non-emitting micro LED elements.
Innovation Solution
Incorporating a substrate with a depressing-projecting structure and a planarization layer, along with a stray light attenuating groove between adjacent micro LED elements that extends towards the depressing-projecting structure, effectively reducing stray light by reflecting and scattering it within the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro LED elements are arranged closely in an LED array, then the display resolution is improved, but stray light propagates to adjacent non-light-emitting micro LED elements causing false glow
Solution Approach 1:
The patent introduces a light blocking structure that divides the space between adjacent micro LED elements into separate regions. This segmentation prevents stray light from one element from reaching adjacent non-light-emitting elements, effectively reducing false glow while maintaining high display resolution through close spacing of micro LED elements.
Solution Approach 2:
The light blocking structure acts as an intermediary element positioned between adjacent micro LED elements. It intercepts and blocks stray light before it can propagate to non-light-emitting elements, serving as a mediator that resolves the conflict between close spacing (for high resolution) and light isolation (to prevent false glow).
2Object-generated harmful factors
If light blocking structures are added between micro LED elements, then stray light is reduced, but the device complexity increases
Solution Approach 1:
The light blocking structure is merged with the substrate or packaging structure, combining multiple functions into a single integrated component. This approach reduces device complexity by eliminating the need for separate light blocking elements, as the same structure simultaneously provides mechanical support and optical isolation.
Solution Approach 2:
The light blocking structure serves multiple functions: it blocks stray light, provides mechanical support for micro LED elements, and may serve as part of the electrical connection system. This multi-functionality reduces the overall device complexity by eliminating the need for separate components for each function.
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 significantly reduces stray light propagation from light-emitting to non-light-emitting pixels, enhancing the accuracy of image presentation by minimizing false glowing effects.
Implementation Method 1
The light reflected on side walls of the non-light-emitting micro LED elements is released to the front
Implementation Method 2
a stray light attenuating groove formed between a pair of adjacent micro LED elements among the plurality of micro LED elements, and extending from toward the pair of micro LED elements to toward the depressing-projecting structure
Data Source
AI summary
An LED array includes: a substrate having a depressing-projecting structure formed on a surface of the substrate; a planarization layer formed on the depressing-projecting structure; a plurality of micro LED elements each of which is formed on the planarization layer; and a stray light attenuating groove formed between a pair of adjacent micro LED elements among the plurality of micro LED elements, and extending from toward the pair of micro LED elements to toward the depressing-projecting structure at least part way of the planarization layer.