Inclined Pixel Electrode Layout to Prevent Display Short Circuits
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Solution Overview
Problem
Display devices face power drainage and circuit issues due to inefficient light emission and short-circuit defects between electrodes in thin-film transistors, particularly in portable information media like smartphones and smartwatches.
Innovation Solution
A pixel design with inclined electrodes and an insulating layer to minimize short-circuit defects, where the electrodes are arranged in a specific pattern with alternating orientations and shapes to enhance light emission efficiency and prevent electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional parallel electrode design is used, then manufacturing is simple, but short-circuit defects occur between adjacent electrodes
Solution Approach 1:
The patent applies asymmetry by designing electrodes with alternating inclined orientations (e.g., +45° and -45° angles) rather than parallel arrangements. This asymmetric angular configuration increases the spatial separation between adjacent electrodes, effectively preventing short-circuit defects while maintaining manufacturing feasibility through standardized fabrication processes.
Solution Approach 2:
The patent transitions from a one-dimensional parallel electrode arrangement to a two-dimensional angular configuration. By introducing angular orientation as an additional dimensional parameter, the design achieves better electrode separation and reduced short-circuit risk without significantly increasing manufacturing complexity, as the angular patterns can be integrated into existing thin-film transistor fabrication workflows.
2Reliability
If electrode spacing is increased to prevent short-circuits, then reliability improves, but light emission efficiency decreases
Solution Approach 1:
The patent optimizes the angular parameter (inclination angle) of the electrodes to achieve an optimal balance between separation and efficiency. By carefully selecting specific angles (such as 45 degrees), the design maximizes electrode spacing for short-circuit prevention while minimizing the impact on the electric field distribution and light emission efficiency of the organic light-emitting diode structure.
Solution Approach 2:
The inclined electrode design creates localized electric field enhancement at specific regions, improving light emission efficiency in critical areas while maintaining adequate spacing elsewhere. This local optimization allows the structure to achieve both reliability through spacing and efficiency through targeted field concentration.
3Use of energy by moving object
If complex electrode patterns are used to improve light emission, then efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The electrode structure is segmented into distinct inclined segments with specific orientations. This segmentation allows each segment to be optimized for light emission while the overall pattern maintains manufacturing simplicity through repetitive, modular design elements that can be fabricated using standard photolithography and thin-film deposition techniques.
Data Source
AI summary
A pixel may include first and second electrodes that are spaced apart from each other in a first direction, the first and second electrodes each extending in a second direction intersecting the first direction; and light emitting elements disposed between the first and second electrodes. The first electrode may include at least one (1-1)th electrode extending in a third direction inclined with respect to one of the first and second directions, and at least one (1-2)th electrode extending in a fourth direction intersecting the third direction. The second electrode may include at least one (2-1)th electrode extending in the third direction and at least one (2-2)th electrode extending in the fourth direction.