Driving Backplane Electrode Structure for Capacitance Uniformity
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Solution Overview
Problem
High-frame-frequency display panels require storage capacitors with consistent capacitance to maintain display quality, but existing designs face challenges in maintaining uniformity due to fluctuations in electrode positions and overlapping areas, leading to variations in driving currents and display effects.
Innovation Solution
The driving backplane incorporates a specific structure with a first conductive layer, an insulating layer, and a second conductive layer, where the second electrode has no opening and is positioned to ensure its orthographic projection coincides with the first sub-electrode's projection, maintaining a consistent overlapping area and reducing capacitance fluctuations, thereby ensuring uniform capacitance and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing storage capacitor designs are used, then the display panel can be manufactured, but the capacitance varies due to electrode position fluctuations and overlapping area variations, leading to non-uniform display quality
Solution Approach 1:
The patent applies preliminary action by pre-defining the electrode structure configuration before manufacturing variations occur. The first electrode is designed with a specific geometry (width W1, length L1) and the second electrode is positioned at a predetermined distance (D1) to ensure that even with manufacturing tolerances, the overlapping area remains consistent. This pre-planned structural arrangement compensates for potential position fluctuations during manufacturing, ensuring uniform capacitance across all pixel circuits.
Solution Approach 2:
The patent employs parameter changes by optimizing the geometric parameters of the electrodes to achieve stable capacitance. Specifically, the first electrode has width W1 and length L1, while the second electrode has width W2, with their relative position controlled by distance D1. By carefully selecting these parameters, the overlapping area between electrodes is maximized and stabilized, making the capacitance less sensitive to manufacturing variations. This parameter optimization ensures that capacitance remains uniform across different pixel circuits despite normal manufacturing tolerances.
2Ease of manufacture
If electrode positions and overlapping areas are not precisely controlled, then the manufacturing process is simpler, but the capacitance fluctuates causing non-uniform driving currents and poor display effects
Solution Approach 1:
The patent applies preliminary action by pre-defining the electrode structure configuration before manufacturing variations occur. The first electrode is designed with a specific geometry (width W1, length L1) and the second electrode is positioned at a predetermined distance (D1) to ensure that even with manufacturing tolerances, the overlapping area remains consistent. This pre-planned structural arrangement compensates for potential position fluctuations during manufacturing, ensuring uniform capacitance across all pixel circuits.
Solution Approach 2:
The patent employs parameter changes by optimizing the geometric parameters of the electrodes to achieve stable capacitance. Specifically, the first electrode has width W1 and length L1, while the second electrode has width W2, with their relative position controlled by distance D1. By carefully selecting these parameters, the overlapping area between electrodes is maximized and stabilized, making the capacitance less sensitive to manufacturing variations. This parameter optimization ensures that capacitance remains uniform across different pixel circuits despite normal manufacturing tolerances.
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 configuration stabilizes the capacitance of storage capacitors across pixel circuits, enhancing the uniformity of display images and reducing the impact of production deviations, resulting in improved display performance and consistency.
Implementation Method 1
The first sub-electrode, the second electrode and a portion of the insulating layer located therebetween constitute a first capacitor
Data Source
AI summary
A driving backplane includes: a substrate; a first conductive layer disposed on the substrate; an insulating layer disposed on a side of the first conductive layer away from the substrate; and a second conductive layer disposed on a side of the insulating layer away from the substrate. The first conductive layer includes a first electrode, the first electrode includes a first sub-electrode and a second sub-electrode surrounding the first sub-electrode, and the second sub-electrode and the first sub-electrode have no gap therebetween. The second conductive layer includes a second electrode. An orthographic projection of the second electrode on the substrate coincides with an orthographic projection of the first sub-electrode on the substrate. The first sub-electrode, the second electrode and a portion of the insulating layer located therebetween constitute a first capacitor.