Array Substrate Multi-Layer Common Electrode Storage Capacitance
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Solution Overview
Problem
In high-resolution liquid crystal display panels, the small pixel size leads to a decrease in the storage capacitance to parasitic capacitance ratio, causing pixels to be susceptible to the feedthrough effect and resulting in poor brightness uniformity.
Innovation Solution
The array substrate design includes a substrate with pixel structures, color filter patterns, and separated common electrode layers, along with a conductive structure comprising multiple conductive layers, which increases the storage capacitance value and reduces the impact of the feedthrough effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to achieve high resolution, then the number of pixels per area increases, but the storage capacitance to parasitic capacitance ratio decreases causing poor brightness uniformity
Solution Approach 1:
The common electrode layer is divided into multiple segments (first common electrode layer and second common electrode layer) that are spatially separated from the pixel electrode. This segmentation allows each electrode segment to contribute independently to the storage capacitance, effectively increasing total capacitance without requiring larger pixel area, thus maintaining high resolution while improving brightness uniformity
Solution Approach 2:
The patent transitions from a single-layer common electrode configuration to a multi-layer configuration where the first and second common electrode layers are disposed at different vertical positions relative to the pixel electrode. This dimensional change (from 2D planar to 3D stacked arrangement) increases the effective capacitance area without increasing the horizontal pixel footprint, resolving the contradiction between high resolution and sufficient storage capacitance
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 enhances the storage capacitance of pixel structures, improving brightness uniformity in high-resolution display panels by mitigating the feedthrough effect.
Implementation Method 1
the first common electrode layer is disposed on the color filter patterns and is structurally separated from the pixel electrodes. The second common electrode layer is disposed on the first common electrode layer and is structurally separated from the pixel electrodes
Data Source
AI summary
An array substrate including a substrate, pixel structures, color filter patterns, a first common electrode layer, a second common electrode layer, a conductive structure, and a conductive pattern is provided. The substrate has a display area and a peripheral area. Each pixel structure is disposed in the display area and includes an active device and a pixel electrode. The color filter patterns are respectively disposed corresponding to the pixel structures. The first common electrode layer and the second common electrode layer are sequentially disposed on the color filter patterns, and are structurally separated from the pixel electrodes. The conductive structure is disposed in the peripheral area, and includes a first conductive layer, a second conductive layer and a third conductive layer sequentially disposed on the substrate, wherein the first conductive layer and the first common electrode layer belong to a first same layer, the second conductive layer and the pixel electrodes belong to a second same layer, the third conductive layer and the second common electrode layer belong to a third same layer. The conductive pattern is disposed in the peripheral area, and is electrically connected to the conductive structure.