Multi-iLED Pixel Architecture for Display Color Mixing
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Solution Overview
Problem
Inorganic light-emitting diode (iLED) displays face issues with variability in color, brightness, and efficiency due to material variability, leading to visible pixelation and fixed pattern noise when viewed at closer distances, which affects viewer satisfaction.
Innovation Solution
The implementation of an iLED display with multiple spatially separated iLEDs per pixel, where each iLED has a distinct substrate and is electrically connected in series or parallel to emit light in response to a control signal, improving color mixing and reducing pixelation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple spatially separated iLEDs are used per pixel, then color mixing is improved and pixelation is reduced, but device complexity increases
Solution Approach 1:
Each pixel is divided into multiple spatially separated iLEDs (e.g., red, green, and blue sub-pixels) that are independently positioned within the pixel area. This segmentation allows each iLED to emit its specific color wavelength, and their combined output achieves superior color mixing and reduced pixelation when viewed from distance
Solution Approach 2:
The patent transitions from a single-point light source per pixel to a distributed array of multiple iLEDs within the same pixel footprint. By utilizing spatial distribution within the pixel plane, the system achieves improved color rendering and reduced visible pixelation without increasing the overall pixel density
2Illumination intensity
If multiple spatially separated iLEDs are used per pixel, then brightness is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The pixel is segmented into multiple iLEDs that can be manufactured separately and then assembled into the final display. This allows for modular manufacturing where precision requirements are managed at the component level rather than requiring ultra-precise monolithic fabrication
Solution Approach 2:
Multiple separately manufactured iLEDs are merged into a single pixel assembly. The individual iLEDs are positioned and electrically connected to form a functional pixel unit, combining their light output to achieve enhanced brightness while managing manufacturing precision through modular assembly
3Reliability
If multiple spatially separated iLEDs are used per pixel, then variability in color and efficiency is reduced, but electrical connection complexity increases
Solution Approach 1:
Each iLED is independently manufactured and tested for its color and efficiency characteristics before assembly. This pre-screening and segmentation approach allows for selection of iLEDs with matched properties, reducing variability in the final pixel output
Solution Approach 2:
The patent applies local quality control by ensuring that each iLED within a pixel has specific, optimized characteristics for its intended color emission. This localized optimization of each iLED's properties contributes to overall pixel consistency and reliability
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 solution enhances brightness, reduces pixelation, and minimizes variability in color and efficiency, resulting in improved display quality and viewer satisfaction by averaging color variations and interdigitating iLEDs within pixels.
Implementation Method 1
each pixel includes a group of two or more spatially separated inorganic light-emitting diodes (iLEDs)
Data Source
AI summary
An inorganic light-emitting diode (iLED) display comprises a separate, independent, and distinct display substrate having a display area. A plurality of spatially separated pixels are distributed on or over the display substrate in the display area. Each pixel includes a group of two or more spatially separated iLEDs each having an iLED substrate separate, independent, and distinct from the display substrate. The two or more iLEDs are electrically connected in common to emit light together in response to a control signal. The pixels can include multiple groups of two or more iLEDs, each group of iLEDs can emit a different color of light to make a full-color display. The iLED display can be a passive-matrix display or include a pixel controller in an active-matrix configuration. The iLEDs and pixel controller can be provided on a pixel substrate disposed on the display substrate.