Micro LED Unit Pixel Light-Blocking Structure for Sub-Pixel Crosstalk
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Solution Overview
Problem
Micro LED displays face challenges in achieving high color reproducibility and contrast due to light interference between adjacent sub-pixels, which affects image quality.
Innovation Solution
A unit pixel design featuring a transparent substrate with a first light blocking layer having windows, an adhesive layer covering the blocking layer, and a second light blocking layer covering the side surfaces of light emitting devices to prevent light interference, along with a method of fabrication that includes preparing the substrate, forming light blocking layers, and mounting light emitting devices on the adhesive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro LEDs are arranged closely on a two-dimensional plane to increase pixel density, then the displaying apparatus can achieve higher resolution, but light interference between adjacent sub-pixels occurs which degrades color reproducibility and contrast
Solution Approach 1:
The patent introduces a third dimension by forming light blocking layers (black matrix and bank structures) that extend vertically from the substrate surface. This vertical dimension allows the light blocking layers to intercept and block stray light from adjacent sub-pixels before it can interfere with the target sub-pixel, thereby resolving the light interference problem while maintaining high pixel density on the two-dimensional plane
Solution Approach 2:
The light blocking layers act as intermediary structures positioned between adjacent light emitting devices. These layers (comprising black matrix and bank structures) serve as mediators that absorb and block stray light, preventing it from reaching adjacent sub-pixels. The intermediary structures effectively isolate the optical paths of neighboring LEDs, eliminating cross-talk while allowing close spacing for high resolution
2Object-affected harmful factors
If light blocking structures are added to prevent light interference, then color reproducibility and contrast improve, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple light blocking functions into an integrated structure. The black matrix and bank structures are formed as coupled components where the bank structure extends from the black matrix, creating a unified light blocking system. This merged structure performs both the function of defining pixel boundaries and blocking stray light, reducing the need for separate components and simplifying the overall device architecture
Solution Approach 2:
The light blocking layers serve multiple functions simultaneously: they define the boundaries of sub-pixels, block stray light from adjacent pixels, and provide structural support for the adhesive layer and light emitting devices. The bank structure in particular performs both light blocking and mechanical support functions, reducing the total number of components needed and simplifying the device structure
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 effectively reduces light interference, enhancing color reproducibility and contrast in micro LED displays by blocking unwanted light emissions and improving the overall image quality.
Implementation Method 1
a second light blocking layer covering side surfaces of the light emitting devices
Data Source
AI summary
A unit pixel is provided. The unit pixel includes a transparent substrate, a first light blocking layer disposed on the transparent substrate and having windows that transmit light, an adhesive layer covering the first light blocking layer, a plurality of light emitting devices disposed on the adhesive layer to be arranged on the windows, and a second light blocking layer covering side surfaces of the light emitting devices.