LED Arrays Using Asymmetric Pixel Arrangements for Off-Axis Color Correction
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Solution Overview
Problem
Video wall displays using LED tiles experience color distortions and variations when viewed from different angles due to non-uniform RGB sub-pixel arrangements and internal emitter patterns, leading to off-axis color skew, which complicates image capture and is difficult to correct with conventional manufacturing techniques.
Innovation Solution
The use of surface mount devices (SMD) with micro-arrays of RGB or RGB+White pixels, arranged in alternating orders and orientations to distribute off-axis color skew across multiple viewing angles, reducing or eliminating cumulative color distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional LED pixel arrangements with fixed RGB sub-pixel configurations are used, then manufacturing is simpler, but off-axis color distortion increases
Solution Approach 1:
The patent applies asymmetry by varying the RGB sub-pixel arrangements across different pixels in a non-uniform pattern. Instead of all pixels having identical RGB configurations, adjacent pixels have different arrangements (e.g., RGB vs. BGR order), which disperses off-axis color distortion effects and achieves more uniform overall color appearance across the display.
Solution Approach 2:
The patent implements local quality by assigning different RGB sub-pixel configurations to different regions or individual pixels within the display array. Each pixel or group of pixels has a customized arrangement optimized for its position, with adjacent pixels having complementary or alternating configurations to compensate for local viewing angle variations.
2Manufacturing precision
If alternating RGB order arrangements are implemented across adjacent pixels, then off-axis color skew is reduced, but PCB routing complexity increases
Solution Approach 1:
The patent segments the display into modular pixel groups or tiles, each with its own optimized RGB arrangement. This segmentation allows independent optimization of each module while maintaining standardized interfaces and connection patterns between modules, thereby reducing overall PCB routing complexity compared to a fully custom non-repeating pattern across the entire display.
Solution Approach 2:
The patent addresses PCB routing challenges by transitioning from a two-dimensional grid-based routing approach to a three-dimensional solution incorporating vertical stacking or multi-layer PCB designs. This allows routing traces to route through multiple layers or dimensions, simplifying connections between pixels with alternating RGB arrangements without increasing planar routing complexity.
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 provides a consistent color appearance across various viewing angles, improving image quality by dispersing color skews and simplifying PCB designs, reducing manufacturing complexity and cost.
Implementation Method 1
LED tiles have different color performance when viewed off-axis from perpendicular. This is due to the diode arrangement, in addition to physicalities of the pixel construction.
Implementation Method 2
if the dispersion of light from the emitters is not perfectly uniform, it becomes skewed off axis
Data Source
AI summary
Disclosed embodiments provide light-emitting arrays of color pixel groups with adjacent pixel groups arranged relative to one another, such as by using different color orders, color orientations or color alignments, so that the off-axis color skew is more dispersed between many viewing angles and thus reduced or even eliminated when large groups of emitters are simultaneously observed from a specific viewing angle, which is one common viewing modality both for human viewers and image capture devices with respect to video display walls. Embodiments also may be formed as surface mount devices (SMD).