Grooved Pixel Electrodes for LED Alignment and Color Isolation
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Solution Overview
Problem
Display devices face challenges in preventing misalignment and color mixing of light emitting elements, leading to defects in image display.
Innovation Solution
The display device incorporates a substrate with pixel electrodes having grooves where light emitting elements are disposed, a planarization layer, and a common electrode, along with a reflective layer and wavelength conversion parts to align and separate light emitting areas, preventing misalignment and color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are disposed directly on pixel electrodes without grooves, then the manufacturing process is simpler, but misalignment and protrusion of light emitting elements occur causing image defects
Solution Approach 1:
The pixel electrode is segmented by forming grooves that divide the electrode surface into distinct regions. These grooves create physical boundaries that guide and constrain the placement of light emitting elements, ensuring precise alignment without requiring complex external alignment mechanisms.
Solution Approach 2:
The grooves are formed in advance on the pixel electrode before the light emitting elements are disposed. This preliminary structuring of the electrode surface creates pre-defined positioning features that automatically guide the light emitting elements into correct positions during the deposition process, preventing misalignment and protrusion.
2Productivity
If light emitting elements are disposed close together to increase pixel density, then productivity and resolution improve, but color mixing and crosstalk between adjacent pixels increases
Solution Approach 1:
The groove structure segments the pixel electrode surface into isolated regions, creating physical barriers between adjacent light emitting elements. This segmentation prevents light from adjacent pixels from mixing and eliminates crosstalk, enabling higher pixel density without compromising color purity.
Solution Approach 2:
The grooves create locally differentiated regions with distinct optical properties. The regions containing light emitting elements are optically isolated from adjacent regions, allowing each pixel to maintain its color purity even when elements are densely packed together.
3Manufacturing precision
If grooves are formed deeper in the pixel electrode to better contain light emitting elements, then alignment precision improves, but manufacturing complexity and cost increase
Solution Approach 1:
The grooves are formed to a depth that is sufficient to achieve the required alignment precision and containment of light emitting elements, but not excessively deep. This optimized depth provides the necessary positioning accuracy while maintaining manufacturing simplicity and avoiding unnecessary complexity in the fabrication process.
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 effectively prevents light emitting elements from protruding and reduces crosstalk between pixels, enhancing image quality by maintaining accurate color reproduction and reducing panel defects.
Implementation Method 1
a reflective layer is disposed on the inclined surface of the one or more grooves and the bottom surface of the one or more grooves
Data Source
AI summary
A display device includes a substrate. A pixel electrode is disposed on the substrate. The pixel electrode has one or more grooves defined therein. Light emitting elements are respectively disposed in the one or more grooves.