Uniform Semiconductor Elements for Display Devices
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Solution Overview
Problem
Current display devices face challenges in achieving uniform quality and density of light emitting elements across different areas, leading to variations in display performance.
Innovation Solution
A method for fabricating a display device that forms uniform semiconductor elements on a common electrode layer, dividing them into light emitting elements for the display area and non-light emitting elements for other areas, ensuring consistent quality and density of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are formed in different areas using conventional methods, then production can proceed, but uniform quality and density of light emitting elements cannot be achieved across display area and non-display area
Solution Approach 1:
The substrate area is segmented into display area and non-display area, with different element formation strategies applied to each segment. Light emitting elements are formed only in the display area while dummy elements are formed in the non-display area, allowing uniform processing across the entire substrate while achieving area-specific functionality.
Solution Approach 2:
Different functional qualities are assigned to different spatial locations: light emitting elements with active layers are created in the display area for light emission, while dummy elements without active layers are created in the non-display area for electrical connection purposes only, achieving local optimization of both areas.
2Reliability
If light emitting elements are formed with high density and uniform quality, then display performance improves, but fabrication process becomes more complex
Solution Approach 1:
Dummy elements are formed in advance in the non-display area during the same fabrication process as the light emitting elements. This preliminary action of creating dummy elements with identical semiconductor layer structures simplifies the overall process by enabling uniform batch processing while ensuring display area elements achieve high density and uniform quality.
Solution Approach 2:
The active layer formation parameter is changed spatially: active layers are formed in light emitting elements located in the display area, while dummy elements in the non-display area are deliberately formed without active layers. This parameter change enables uniform fabrication processes to produce area-specific functional outcomes, improving display quality consistency without proportionally increasing fabrication complexity.
Data Source
AI summary
A display device and method for fabrication thereof includes a plurality of pixel electrodes and common electrode connection parts that are spaced from each other on a first substrate, a plurality of light emitting elements on the plurality of pixel electrodes, a plurality of common electrode elements on the common electrode connection parts, and a common electrode layer on the plurality of light emitting elements and the plurality of common electrode elements, wherein each of the plurality of light emitting element includes a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer, each of the plurality of common electrode elements includes at least the second semiconductor layer, and the common electrode layer includes a same material as the second semiconductor layer to be connected to the second semiconductor layers of the plurality of light emitting elements.