MicroLED Common-Interconnection Layout for Uniform Pixel Voltage
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Solution Overview
Problem
Conventional microLED displays suffer from non-uniform voltage across the pixel array due to the sheet resistivity of the transparent or semi-transparent conductive layer, leading to decreased brightness uniformity and color accuracy.
Innovation Solution
The implementation of opaque conductive elements connected to common-interconnections within each pixel, along with a method of hybrid-bonding front-plane and back-plane layers to embed LEDs and common-interconnections in dielectric layers, ensuring uniform voltage distribution across the pixel array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent or semi-transparent conductive layer is used as common electrode, then electrical connection is achieved, but non-uniform voltage distribution occurs due to sheet resistivity
Solution Approach 1:
The patent divides the common electrode into multiple discrete opaque conductive elements (first common-interconnection, second common-interconnection, third common-interconnection) positioned at different locations within the pixel array. Each conductive element is electrically connected to multiple LEDs, providing localized electrical connection and reducing the impact of sheet resistivity by eliminating the need for a continuous transparent conductive layer that spans the entire pixel array.
Solution Approach 2:
The opaque conductive elements are designed to create equipotential regions by providing low-resistance electrical paths to multiple LEDs. By strategically positioning these conductive elements and connecting them to specific LED groups, the patent ensures uniform voltage distribution across the pixel array, compensating for the voltage drops that would otherwise occur in transparent conductive layers.
2Ease of operation
If transparent conductive layer is used, then common electrode function is provided, but brightness uniformity decreases
Solution Approach 1:
The common electrode function is segmented into multiple discrete opaque conductive elements rather than using a single continuous transparent layer. This segmentation allows for optimized positioning of conductive elements to ensure uniform voltage distribution, which directly improves brightness uniformity while maintaining the common electrode function of providing electrical connection to multiple LEDs.
Solution Approach 2:
The patent employs a composite structure combining opaque conductive materials with dielectric materials. The opaque conductive elements are embedded in or positioned relative to dielectric layers, creating a composite structure that provides both electrical connection (common electrode function) and uniform voltage distribution (brightness uniformity) without relying on transparent conductive materials.
3Reliability
If transparent conductive layer is used, then electrical connection is achieved, but color accuracy decreases
Solution Approach 1:
By segmenting the common electrode into discrete opaque conductive elements, the patent eliminates the voltage non-uniformity caused by transparent conductive layers. This ensures consistent voltage delivery to all LEDs, which is critical for maintaining color accuracy across the entire pixel array while still providing reliable electrical connection through the distributed conductive elements.
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 approach enhances brightness uniformity and color accuracy by maintaining consistent voltage across the pixel array, improving display quality.
Implementation Method 1
an opaque conductive element electrically connected to each of the first common-interconnection and the second common-interconnection
Implementation Method 2
The method includes hybrid-bonding a first front-plane layer to a back-plane layer. The method also includes hybrid-bonding a second front-plane layer to a first spacer-dielectric layer located on the first front-plane layer.
Data Source
AI summary
A micro light-emitting diode (LED) display includes a first pixel, a second pixel, and an opaque conductive element. The first pixel includes a first LED, a third LED, and a first common-interconnection electrically connected to each of the first LED and the third LED. The second pixel includes a second LED, a fourth LED, and a second common-interconnection electrically connected to each of the second LED and the fourth LED. The opaque conductive element is electrically connected to each of the first common-interconnection and the second common-interconnection.