Display Device Voltage Wiring and Electrode Line Alignment
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Solution Overview
Problem
Current display devices face challenges in reducing the number of manufacturing processes and preventing misalignment of light emitting elements during the manufacturing process, particularly in forming wirings that apply voltage and ensuring these wirings do not interfere with emission areas.
Innovation Solution
A display device design featuring a first and second voltage wiring positioned outside emission areas, with electrodes and electrode lines electrically connected to these wirings, allowing for reduced process complexity and minimized interference with light emitting elements during alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage wirings are formed inside emission areas to reduce manufacturing processes, then device complexity is reduced, but misalignment of light emitting elements occurs during manufacturing
Solution Approach 1:
The patent divides the wiring structure into two distinct segments: voltage wirings positioned outside emission areas and electrode lines positioned inside emission areas. This segmentation allows voltage wirings to avoid interfering with light emitting element alignment while electrode lines remain available for precise alignment within emission areas, thus resolving the contradiction between reduced device complexity and maintained manufacturing precision.
Solution Approach 2:
The patent extracts the voltage wiring function from the emission areas by positioning voltage wirings outside these regions. This extraction eliminates the harmful interference of voltage wirings with light emitting element alignment while maintaining the necessary voltage supply function through separate electrode lines within emission areas, thereby solving the alignment precision problem without increasing overall device complexity.
2Manufacturing precision
If voltage wirings are positioned outside emission areas to prevent misalignment, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage supply function with the electrode structure by making electrode lines electrically connected to both voltage wirings and light emitting elements. This integration allows a single electrode line structure to serve dual purposes: maintaining precise alignment within emission areas and receiving voltage supply from external wirings, thereby improving manufacturing precision without proportionally increasing device complexity.
Solution Approach 2:
The electrode lines serve multiple functions: they act as alignment references for light emitting elements during manufacturing, serve as electrical connection paths from voltage wirings to light emitting elements, and function as part of the light emitting element structure itself. This multi-functionality resolves the contradiction by achieving precise alignment control without requiring separate dedicated alignment structures that would increase device complexity.
Data Source
AI summary
A display device comprises a pixel which comprises emission areas, a first voltage wiring and a second voltage wiring, which are outside the emission areas of the pixel and extend in a first direction and a second direction crossing the first direction, first electrodes and second electrodes which are respectively in the emission areas and extend in one direction, light emitting elements which are on the first and second electrodes, first contact electrodes which contact the first electrodes and the light emitting elements, and second contact electrodes which contact the second electrodes and the light emitting elements, and a first electrode line which overlaps the first voltage wiring and is outside the emission areas and a second electrode line which overlaps the second voltage wiring and is outside the emission areas, wherein each of the first electrodes and the first electrode line is electrically connected to the first voltage wiring, and each of the second electrodes and the second electrode line is electrically connected to the second voltage wiring.