μLED Display Subpixel Arrangement for Color Location Consistency
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Solution Overview
Problem
In the manufacturing of μLED displays, fluctuations in semiconductor layer placement lead to color location deviations among pixels, resulting in inconsistent color purity and increased manufacturing costs due to the need for grouping and characterization of μLED-components.
Innovation Solution
The proposed solution involves a display arrangement with each pixel comprising at least two subpixels of each color, where the color location of the optoelectronic components is chosen to compose a target color location, and a control unit is used to ensure correct color composition by providing a common current or varying currents to the subpixels, allowing for compensation of brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If μLED-components are manufactured with standard processes, then production volume is achieved, but color location deviations occur resulting in inconsistent color purity
Solution Approach 1:
Each pixel is divided into multiple subpixels (at least two) of the same color, where each subpixel contains an optoelectronic component. This segmentation allows combining components with different color locations to achieve the target color location, resolving the contradiction between maintaining color consistency and producing large volumes.
Solution Approach 2:
The invention changes the approach from selecting components with identical color locations to selecting components whose color locations, when combined, produce the target color location. The control unit adjusts the drive currents to optimize the composite color output, enabling consistent color purity across high-volume production.
2Manufacturing precision
If μLED-components are grouped and characterized to ensure color consistency, then color purity is improved, but handling effort and costs increase
Solution Approach 1:
The system uses the natural distribution of color locations in mass-produced μLED-components rather than requiring precise pre-sorting. The control unit automatically adjusts drive currents to compensate for variations, allowing the manufacturing process to serve itself by utilizing production variations rather than eliminating them through labor-intensive grouping.
Solution Approach 2:
The invention changes the control parameter from selecting components based on identical color locations to adjusting drive currents to achieve target color locations. This eliminates the need for manual grouping and characterization while maintaining color consistency.
3Manufacturing precision
If components with identical color locations are selected, then color consistency is achieved, but component distribution variability between displays increases
Solution Approach 1:
By using multiple subpixels per color in each pixel, the system can combine components from different color location distributions to achieve consistent target colors. This segmentation approach allows different displays to be assembled from components with varying individual characteristics while maintaining overall uniformity.
Solution Approach 2:
The control unit measures or determines the actual color locations of components and adjusts drive currents accordingly to achieve the target color location. This feedback mechanism ensures that all displays, regardless of component distribution variations, achieve consistent color output.
Data Source
AI summary
In an embodiment an arrangement includes a plurality of pixels, wherein each pixel includes at least two subpixels of each color, wherein each color is defined by a predefined target color location, wherein each subpixel comprises an optoelectronic component defined by a color location, wherein the color locations of the optoelectronic components of each color is chosen such that during operation of the optoelectronic components the predefined target color location is met for each color, wherein the optoelectronic components for each color are of identical design, and a controller configured to commonly control the optoelectronic components of a color.