Display Pixel Layout With Dummy Electrodes to Minimize Spot Defects
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Solution Overview
Problem
Display devices face issues with spot defects due to differences in density of partition walls and electrodes, leading to visual imperfections in the display area.
Innovation Solution
A display device design that includes electrodes and light emitting elements with dummy pixels and partition walls, where dummy electrodes and partition walls are formed on the same layer as the actual electrodes and partition walls, minimizing density differences and potential defects by using a method that aligns light emitting elements between electrodes with applied voltages during fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dummy pixels with dummy partition walls and dummy electrodes are added to minimize spot defects, then manufacturing precision and visual quality improve, but device complexity increases
Solution Approach 1:
The patent creates dummy pixels that are copies of actual pixels, containing dummy partition walls and dummy electrodes that replicate the structure and density characteristics of real pixels. This copying approach ensures that the dummy pixels match the density of actual pixels, preventing spot defects while maintaining manufacturing precision without requiring fundamentally new structures
Solution Approach 2:
The patent applies homogeneity by ensuring that dummy pixels have the same structural characteristics as actual pixels. The dummy partition walls and dummy electrodes are designed to create uniform density across the entire substrate, including both display and non-display areas. This homogeneity prevents visual defects caused by density differences between different regions
2Manufacturing precision
If alignment voltages are applied during fabrication to position light emitting elements, then manufacturing precision improves, but use of energy increases
Solution Approach 1:
The patent applies preliminary action by forming alignment lines and dummy electrodes before placing the light emitting elements. The alignment voltages are applied temporarily during the fabrication process to guide precise positioning, then removed after alignment is complete. This preliminary structuring enables high precision alignment without requiring continuous energy input during operation
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 approach effectively minimizes spot defects in the display area by ensuring uniform density of patterns, enhancing the display's visual quality and reliability.
Implementation Method 1
aligning the light emitting elements between the electrodes by applying alignment voltages to the alignment lines
Data Source
AI summary
A display device includes electrodes disposed in a display area and spaced apart from each other, light emitting elements disposed between the electrodes, conductive lines disposed in a non-display area and electrically connected to the electrodes, and dummy pixels disposed on the conductive lines. The dummy pixels each may include dummy partition walls spaced apart from each other, and dummy electrodes disposed on the partition walls and spaced apart from each other.