Black Matrix Backplane Integration for MicroLED Contrast Control
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Solution Overview
Problem
Existing optoelectronic systems face issues with surface reflection and reduced contrast due to reflective pixel circuit layers, which affect performance under ambient conditions.
Innovation Solution
Integrating a black matrix layer on the backplane substrate to reduce surface reflection and enhance contrast, with microdevices coupled through backplane pads, and optionally incorporating additional optical structures like wavelength tuning materials or reflective layers to manage light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a black matrix layer is added to reduce surface reflection and improve contrast, then the contrast and anti-reflective performance are improved, but the device complexity and manufacturing steps increase
Solution Approach 1:
The patent combines the black matrix layer formation with the existing pixel circuit layer formation process. The black matrix is integrated into the same manufacturing sequence as the pixel circuits, allowing both components to be created in a unified process flow rather than as separate additions, thereby reducing overall device complexity despite adding the black matrix functionality.
Solution Approach 2:
The black matrix layer serves multiple functions simultaneously: it acts as a reflective barrier to improve contrast, provides structural support for the pixel circuit layer, and can be integrated with the substrate architecture. This multi-functionality reduces the need for additional separate components, offsetting the complexity increase from adding the black matrix layer.
2Reliability
If the black matrix is formed before integrating microdevices, then the black matrix can be properly integrated with the substrate, but the manufacturing process complexity increases
Solution Approach 1:
The black matrix layer is formed on the substrate before the microdevices are integrated. This preliminary formation ensures that the black matrix is properly established and integrated with the substrate architecture before additional components are added, ensuring reliable integration while maintaining a logical manufacturing sequence.
Solution Approach 2:
The manufacturing process is segmented into distinct stages: first forming the black matrix layer on the substrate, then subsequently integrating the microdevices. This segmentation allows each component to be optimized independently while ensuring proper integration, balancing reliability requirements with manufacturing ease.
3Illumination intensity
If reflective layers are added to manage light reflection, then the light management performance is improved, but the device complexity and number of layers increase
Solution Approach 1:
The reflective layers are merged with the black matrix layer structure. Rather than adding separate reflective layers independently, the patent integrates the reflective functionality into the black matrix layer itself, allowing both the reflective barrier function and the contrast improvement function to be achieved within a unified layer structure, thereby reducing the total number of discrete layers.
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 integration of a black matrix and optional optical structures improves the optoelectronic system's contrast and reduces surface reflection, enhancing overall performance.
Implementation Method 1
a layer of a black matrix on the backplane substrate... to reduce surface reflection and improve a contrast
Data Source
AI summary
The present invention discloses methods to reduce a surface reflection and improve a contrast in an optoelectronic system with microdevices that may comprise of microLED's, microsensors, MEMS, or another type of semiconductor or optoelectronic device. In particular, there is use of black matrix, pixel circuit layers, reflective layers, optical structures, photo definable polymer and dielectrics. Here the optical structure may comprise wavelength tuning materials.