Pixel Electrode Overlap Layout for Light-Emitting Element Alignment
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Solution Overview
Problem
Existing display devices face challenges in maintaining the alignment of light emitting elements, leading to misalignment issues that affect the reliability and luminous efficiency of the display panel.
Innovation Solution
The display device design includes first and second electrodes of each pixel overlapping vertical gate lines and data lines in the thickness direction, with a specific configuration that enhances the alignment process and secures larger alignment areas for light emitting elements, improving reliability and luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are aligned using conventional methods, then the alignment process can be completed, but misalignment issues occur that reduce reliability and luminous efficiency
Solution Approach 1:
The patent introduces an intermediary structure (the electrode pattern with specific overlapping configuration with respect to gate lines) that serves as a reference marker during the alignment process. This intermediary structure enables precise positioning of light emitting elements by providing a clear geometric reference, thereby improving alignment precision and reliability without requiring complex alignment mechanisms
Solution Approach 2:
The electrode structure is designed in advance with specific overlapping characteristics relative to gate lines before the light emitting elements are positioned. This preliminary configuration of the electrode pattern establishes predetermined alignment references that guide the subsequent placement of light emitting elements, ensuring accurate alignment before the actual assembly is completed
2Productivity
If alignment area for light emitting elements is increased, then luminous efficiency improves, but device complexity increases
Solution Approach 1:
The electrode structure serves multiple functions simultaneously: it acts as both the functional electrode for light emitting element operation and as an alignment reference structure during manufacturing. The overlapping configuration with gate lines provides alignment information while the electrode itself performs its electrical function, eliminating the need for separate alignment markers and reducing overall device complexity despite increased alignment area
Solution Approach 2:
The patent merges the alignment reference function with the functional electrode structure. Instead of having separate alignment markers and functional electrodes, the electrode is designed to inherently provide alignment references through its overlapping configuration with gate lines, combining multiple functions into a single integrated structure that reduces complexity
Data Source
AI summary
A display device comprises a pixel circuit of each of first to third pixels disposed on a substrate, first to third vertical gate lines extending in a first direction and disposed on a side of the pixel circuit of each of the first to third pixels, respectively, a horizontal gate line extending in a second direction intersecting the first direction and disposed on the first to third vertical gate lines, a first electrode of each of the first to third pixels extending in the first direction and disposed on the horizontal gate line, and a second electrode of each of the first to third pixels extending in the first direction, the second electrode and the first electrode being disposed in a same layer. The first electrode of the first pixel overlaps the first vertical gate line, and the first electrode of the second pixel overlaps the second vertical gate line.