Bank Structures for Micro LED Optical Isolation
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Solution Overview
Problem
Light-emitting diode (LED) display devices experience optical cross-talk phenomena due to lateral light emission, leading to color mixing, halo effects, reduced contrast, and decreased color saturation, especially when closely arranged in arrays.
Innovation Solution
The implementation of bank structures on the array substrate, which form accommodating regions for micro light-emitting diodes, effectively reducing optical cross-talk by controlling light emission and improving light-emitting efficiency through varying angles and materials, such as black photoresist and white photoresist combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro light-emitting diodes are closely arranged in an array to increase display resolution, then the display density is improved, but optical cross-talk occurs causing color mixing and reduced contrast
Solution Approach 1:
The patent divides the display structure into isolated micro-cavities using bank structures. Each micro light-emitting diode is confined within its own cavity, segmenting the light emission paths and preventing lateral light from adjacent LEDs from causing cross-talk, thus maintaining high resolution while eliminating optical interference
Solution Approach 2:
The bank structures serve as intermediary elements between adjacent micro light-emitting diodes. These structures physically separate the LEDs and control light propagation, acting as a mediator that prevents direct optical interaction between neighboring LEDs while allowing each to function independently at high density
2Object-affected harmful factors
If bank structures are introduced to reduce optical cross-talk, then optical display performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the bank structures: they serve as physical separators, light guides, and structural support simultaneously. By combining these functions into a single integrated component rather than adding separate elements, the design reduces overall device complexity while effectively addressing optical cross-talk
Solution Approach 2:
The bank structures are designed to perform multiple functions: isolating individual LEDs, guiding light emission, providing mechanical support, and defining cavity geometries. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while achieving superior optical performance
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 design significantly enhances the optical display performance of LED display devices by minimizing optical cross-talk and improving light-emitting efficiency, resulting in better contrast and color saturation.
Implementation Method 1
Since the light-emitting diode is a multi-surface light-emitting light source, lateral light of the light-emitting diode emitting onto the adjacent light-emitting diode is likely to result in an optical cross-talk phenomenon
Data Source
AI summary
The embodiment provides a display device including an array substrate, an opposite substrate, a plurality of micro light-emitting diodes and a plurality of bank structures. The opposite substrate is disposed opposite to the array substrate. The micro light-emitting diodes are arranged in an array on the array substrate, wherein the micro light-emitting diodes are electrically connected to the array substrate. The bank structures are located between the array substrate and the opposite substrate, wherein the bank structures form a plurality of accommodating regions, and one of the micro light-emitting diodes is located in one of the accommodating regions. A height of the bank structures is more than or equal to a height of the micro light-emitting diodes.