Micro-LED Pixel Overlap Layout for Etching-Damage Compensation
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Solution Overview
Problem
Micro-LED displays face a decrease in luminous efficiency due to sidewall etching damage during chip manufacturing, leading to non-emissive bonding and variations in emissive performance across different colors.
Innovation Solution
A display device design incorporating a pixel structure with a first micro light emitting element, a second micro light emitting element, and a third micro light emitting element, where the second region of the first micro light emitting element overlaps the second and third micro light emitting elements, correcting luminous efficiency deviations caused by sidewall etching damage and enhancing resolution and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro-LED chip size is decreased to achieve high resolution, then display resolution is improved, but luminous efficiency deteriorates due to sidewall etching damage
Solution Approach 1:
The micro-LED chip is divided into multiple regions with different functions: a light-emitting region and a non-light-emitting region. The non-light-emitting region is specifically designed to compensate for sidewall etching damage, separating the emission function from the compensation function to maintain efficiency at smaller sizes
Solution Approach 2:
Different regions of the micro-LED chip are given different properties: the light-emitting region is optimized for photon generation while the non-light-emitting region is optimized for compensating etching damage. This local differentiation allows the chip to maintain high luminous efficiency even at reduced dimensions
2Quantity of substance
If micro-LED chip size is decreased to achieve high density, then display density is improved, but manufacturing precision deteriorates due to sidewall etching damage
Solution Approach 1:
The non-light-emitting region is pre-designed and positioned to compensate for anticipated sidewall etching damage before the actual etching process occurs. This preliminary structural arrangement ensures that even with manufacturing variations, the final emitted light quality remains consistent
Solution Approach 2:
The harmful sidewall etching damage is converted into a beneficial compensation mechanism. The non-light-emitting region is strategically positioned to offset the negative effects of etching, transforming a manufacturing defect into a functional advantage that maintains precision at higher densities
3Length of stationary object
If micro-LED chip size is decreased to achieve small display size, then display size is reduced, but luminous efficiency deteriorates due to non-emissive bonding
Solution Approach 1:
The chip structure is segmented into light-emitting and non-light-emitting regions, allowing the non-emissive portions to be strategically placed where they compensate for bonding issues rather than waste active emission area
Solution Approach 2:
Different regions serve different purposes: the light-emitting region maximizes photon output while the non-light-emitting region addresses bonding-related efficiency losses. This local functional differentiation maintains overall efficiency despite the challenges of miniaturization and bonding
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 addresses luminous efficiency variations and achieves high-density, high-resolution displays by optimizing the placement and overlap of micro light emitting elements, improving overall display performance.
Implementation Method 1
a first micro light emitting element including a first region that emits first light and a second region that does not emit the first light
Data Source
AI summary
Disclosed herein is a display device including at least one pixel, wherein the pixel includes a first micro light emitting element including a first region that emits first light and a second region that does not emit the first light, a second micro light emitting element that emits second light, and a third micro light emitting element that emits third light, and the second region at least partially overlaps the second and third micro light emitting elements on a plane.