Micro LED Display Panel Series-Connected Redundancy
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Solution Overview
Problem
Conventional micro LED display panels face issues with display quality due to single micro LED per pixel, leading to malfunction and non-uniform brightness, especially in passive driving systems, where epitaxial process variations affect wavelength and brightness uniformity.
Innovation Solution
The micro LED display panel incorporates two micro LEDs per pixel region, electrically connected in series, allowing for redundancy in case of malfunction and improved brightness uniformity through specific wavelength alignment and current management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one micro LED is provided per pixel, then the device complexity is reduced, but the reliability deteriorates due to malfunction and brightness non-uniformity
Solution Approach 1:
Each pixel is divided into multiple sub-pixels, and each sub-pixel contains multiple micro LEDs (at least two) connected in series. This segmentation allows the pixel to maintain functionality even if one micro LED fails, as other micro LEDs in the same sub-pixel or other sub-pixels can compensate, thereby improving reliability without significantly increasing overall structural complexity.
Solution Approach 2:
Different sub-pixels within the same pixel can have different numbers of micro LEDs (e.g., some sub-pixels have two micro LEDs while others have one), allowing local optimization of brightness uniformity and reliability. This local quality approach enables targeted improvement in specific areas of the pixel without uniformly increasing complexity across the entire display.
2Reliability
If two micro LEDs are connected in series per sub-pixel, then the reliability is improved through redundancy, but the device complexity increases
Solution Approach 1:
Multiple micro LEDs are merged into series-connected circuits within sub-pixels, allowing them to function as a unified lighting element. This merging provides redundancy (if one LED fails, others in the series can still operate) while managing circuit complexity through systematic arrangement and shared control structures across pixels.
3Manufacturing precision
If micro LEDs with varying wavelengths are used, then the manufacturing precision is improved, but the brightness uniformity deteriorates
Solution Approach 1:
The patent acknowledges that epitaxial process variations cause wavelength variations in micro LEDs. By using multiple micro LEDs per sub-pixel and allowing different sub-pixels to have different numbers of micro LEDs, the system can compensate for wavelength variations through combined light output, maintaining brightness uniformity despite manufacturing tolerances.
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 ensures normal operation of each pixel even if one micro LED fails, enhances brightness uniformity, and reduces current demand, thereby extending the service life of micro LEDs.
Implementation Method 1
a first sub-pixel region is provided with two micro LEDs electrically connected in series, and a dominant wavelength of the two micro LEDs is within a wavelength range of red light
Implementation Method 2
both of the two micro LEDs emit light
Data Source
AI summary
A micro LED display panel includes a driving substrate and a plurality of micro light emitting diodes (LEDs). The driving substrate has a plurality of pixel regions. Each of the pixel regions includes a plurality of sub-pixel regions. The micro LEDs are located on the driving substrate. At least one of the sub-pixel regions is provided with two micro LEDs of the micro LEDs electrically connected in series, and a dominant wavelength of the two micro LEDs is within a wavelength range of a specific color light. In a repaired sub-pixel region of the sub-pixel regions, only one of the two micro LEDs emits light. In a normal sub-pixel region of the sub-pixel regions, both of the two micro LEDs emit light.