Crossing Pixel Electrodes to Prevent Shorts in Multi-Stage Displays
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Solution Overview
Problem
Existing display devices face challenges in preventing electrical shorts between electrode series stages, particularly when multiple series stages are disposed in one pixel, which affects manufacturing efficiency and reliability.
Innovation Solution
The display device incorporates a substrate with alignment electrodes and pixel electrodes arranged in a specific configuration, where the pixel electrodes cross each other to secure a space margin and prevent electrical shorts, with connection electrodes and intermediate electrodes strategically placed to ensure proper electrical connection and alignment of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple series stages are disposed in one pixel, then the light emitting unit can be driven at high voltage to improve brightness and efficiency, but electrical shorts between electrode series stages may occur
Solution Approach 1:
The patent transitions from a linear electrode arrangement to a crossing configuration where first and second pixel electrodes intersect at different heights. This dimensional change allows series stages to be connected vertically through the crossing point, preventing electrical shorts while maintaining high voltage operation for improved brightness and efficiency.
Solution Approach 2:
The electrode structure is segmented into multiple series stages with distinct first and second pixel electrodes. Each stage is electrically isolated through the crossing configuration, allowing independent control and preventing electrical shorts between stages while enabling high voltage driving for enhanced light emission.
2Reliability
If pixel electrodes are arranged to cross each other to prevent electrical shorts, then manufacturing reliability improves, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple electrodes into a crossing configuration where first and second pixel electrodes serve dual purposes: they individually define pixel boundaries and simultaneously connect series stages at their intersection. This integration reduces the need for separate connection structures, simplifying manufacturing while ensuring electrical isolation.
3Productivity
If connection electrodes are strategically placed to ensure proper electrical connection, then manufacturing efficiency improves, but device complexity increases
Solution Approach 1:
The crossing point of the first and second pixel electrodes automatically serves as the connection point for series stages, eliminating the need for separate connection electrodes. This self-service configuration simplifies the manufacturing process by reducing the number of components and assembly steps required, thereby improving manufacturing efficiency without compromising electrical connectivity.
Data Source
AI summary
A display device includes a substrate including an emission area and a non-emission area, alignment electrodes arranged to be spaced from each other in a first direction on the substrate and extending in a second direction crossing the first direction, and pixels arranged along the second direction. Pixels adjacent to each other in the second direction from among the pixels may be configured to emit light of different colors. Each of the pixels may include first light emitting elements on the alignment electrodes and arranged along the second direction, second light emitting elements on the alignment electrodes, spaced from the first light emitting elements in the first direction, and arranged along the second direction, a first pixel electrode electrically connected to a first driving power and first ends of the first light emitting elements, a second pixel electrode spaced from the first pixel electrode in the first direction.