Sub-Pixel Capacitor Electrode Layout for Alignment Error Tolerance
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Solution Overview
Problem
Existing display devices face challenges in maintaining consistent display quality due to alignment errors between capacitor electrodes, which affect the overlapping area and capacitance, leading to variations in pixel performance.
Innovation Solution
The display device incorporates a capacitor design with protrusion parts on the second capacitor electrode to maintain a constant overlapping area with the first capacitor electrode, despite alignment errors, ensuring consistent capacitance and improved pixel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional capacitor electrodes with straight edges are used, then manufacturing is simpler, but alignment errors cause variations in overlapping area and capacitance
Solution Approach 1:
The second capacitor electrode is designed with asymmetric protrusion parts that extend beyond the first capacitor electrode's edges. This asymmetric geometry compensates for alignment errors by ensuring that the overlapping area remains constant even when lateral shifts occur during manufacturing, thereby resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The protrusion parts on the second capacitor electrode are pre-configured to anticipate and compensate for potential alignment errors before they occur. By designing the electrode shape in advance with built-in compensation features, the system maintains consistent overlapping area without requiring complex real-time adjustment mechanisms during manufacturing.
2Reliability
If capacitor electrodes are designed to compensate for alignment errors, then display quality improves, but electrode fabrication becomes more complex
Solution Approach 1:
The asymmetric protrusion design on the second capacitor electrode provides built-in compensation for alignment variations. This geometric feature ensures that the overlapping area between electrodes remains constant despite manufacturing tolerances, thereby maintaining reliable pixel performance without requiring complex fabrication processes or additional components.
3Quantity of substance
If the second capacitor electrode overlaps the first capacitor electrode completely, then capacitance is maximized, but alignment errors reduce the effective overlapping area
Solution Approach 1:
The second capacitor electrode incorporates protrusion parts that extend beyond the first capacitor electrode's boundaries. This asymmetric design ensures that the overlapping area remains stable and consistent even when alignment errors occur during manufacturing, thereby maintaining reliable capacitance values without requiring perfect alignment precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design stabilizes the overlapping area between capacitor electrodes, enhancing display quality by reducing variations in pixel performance and maintaining consistent luminance across the display.
Implementation Method 1
a capacitor formed between the first node and the second node. The capacitor may include a first capacitor electrode, and a second capacitor electrode overlapping the first capacitor electrode in a plan view
Data Source
AI summary
A sub-pixel of a display device includes: a first transistor including a gate electrode connected to a first node, a first terminal connected to a first power line, and a second terminal connected to a second node; a light emitting part connected to the second node and a second power line and including at least one light emitting element; and a capacitor formed between the first and second nodes. The capacitor includes a first capacitor electrode, and a second capacitor electrode overlapping the first capacitor electrode with an insulating layer interposed therebetween in a plan view. The second capacitor electrode includes a first protrusion part protruding further in an extending direction than an edge of the first capacitor electrode, and a second protrusion part protruding further in a direction opposite to the extending direction from a portion of an edge of the second capacitor electrode in a plan view.