SMD Pixel Arrays for Off-Axis Color Correction
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Solution Overview
Problem
High-resolution LED displays face challenges with off-axis color distortions due to non-uniform light emission and physical arrangements of pixels, leading to inefficiencies in repairability and visual uniformity, especially when used in video walls where dynamic images are captured from varying angles.
Innovation Solution
The use of surface mount devices (SMD) with micro-arrays of alternating RGB and white pixels, arranged in specific orders and orientations to minimize off-axis color skew, allowing for reduced or eliminated color distortions across a wide range of viewing angles, and enabling efficient repair and reduced waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional RGB SMD LEDs are used with reduced pixel spacing for high resolution, then display resolution is improved, but off-axis color distortion increases and physical damage risk during installation increases
Solution Approach 1:
The patent applies local quality by assigning different emitter types (RGB vs. white) to different spatial locations within the pixel array. White emitters are strategically placed at specific positions to correct color distortion in those local regions, while RGB emitters handle color generation in other areas. This localized differentiation allows correction of off-axis color distortion without compromising overall display resolution.
Solution Approach 2:
The patent employs asymmetry by creating an non-uniform distribution of emitter types within the pixel array. Rather than uniform RGB repetition, the arrangement includes white emitters at specific asymmetric positions relative to the RGB emitters. This asymmetric configuration optimizes color uniformity from off-axis viewing angles while maintaining high resolution.
2Strength
If potting compound is applied over LED array for robustness, then mechanical durability is improved, but repairability deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the display into modular tile units that can be independently handled. Each tile contains a complete functional array that can be replaced as a unit, and individual pixels within tiles remain accessible for repair. This segmentation allows the potting compound to provide robustness at the tile level while maintaining repairability at the pixel level through controlled access points.
Solution Approach 2:
The patent implements discarding and recovering by designing tiles with replaceable modules. When damage occurs, only the affected tile or pixel module needs to be discarded and replaced, while the rest of the display is recovered and continues functioning. This approach maintains robustness through protective packaging while enabling efficient repair through modular replacement rather than requiring full array replacement.
3Reliability
If entire array is replaced when single pixel is damaged, then reliability is improved, but waste increases
Solution Approach 1:
The patent applies segmentation by organizing the display into hierarchical modular structures (pixels → tiles → arrays). This allows damage containment at the pixel level and replacement at the tile level, preventing the need to replace entire arrays when single pixels are damaged. The segmentation maintains reliability through modular redundancy while dramatically reducing material waste by enabling selective replacement of only the affected modules.
Solution Approach 2:
The patent implements discarding and recovering through modular tile design with standardized interfaces. When a pixel or small group of pixels fails, only the affected tile module is discarded and replaced, while the majority of the display array is recovered and continues to function. This approach maintains high reliability through easy module replacement while minimizing waste by recovering and retaining over 99% of functional pixels in the event of single-pixel failures.
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 configuration provides a robust, repairable, and visually uniform LED display with reduced off-axis color skew, enhancing the quality of captured images and reducing environmental waste by allowing for single-unit replacement rather than entire array disposal.
Implementation Method 1
at least one white emitter with a height and width sized at least substantially equal to a combined height and width of a multi-color set of emitters of a neighboring pixel
Data Source
AI summary
Light-emitting surface mount devices comprised of an array of emitters forming multi-color and white pixels wherein the multi-color pixels have at least substantially the same overall pixel height and width as the white pixels in the array and methods of making same are disclosed. Visual uniformity is enhanced thereby. 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,