Display Panel Electrode Stacking for Higher Pixel Storage Capacitance
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Solution Overview
Problem
The challenge is to increase storage capacitance in display panels without compromising operational electrical properties, given the limited space available for the storage capacitor as pixel structures are miniaturized for better display quality.
Innovation Solution
The display panel design includes a substrate with intersecting scan and data lines, pixel structures featuring active devices, capacitor electrodes, and passivation layers, where the capacitor electrode and common electrode distances are optimized, and the overcoat layer is strategically positioned between the common and capacitor electrodes to enhance capacitance while reducing coupling effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pixel structure size is reduced to achieve better display quality, then the display quality is improved, but the storage capacitance space is compressed
Solution Approach 1:
The patent transitions from planar capacitor layout to a three-dimensional stacked configuration. The capacitor electrode, common electrode, and pixel electrode are arranged in vertical layers with controlled spacing, utilizing the stacking direction (perpendicular to substrate) to increase capacitance without expanding lateral area. This dimensional transition allows capacitance enhancement while maintaining reduced pixel footprint.
Solution Approach 2:
The patent implements a nested electrode structure where the capacitor electrode and common electrode are positioned between the pixel electrode and substrate, with multiple passivation and overcoat layers interleaved. This nested arrangement maximizes space utilization within the vertical profile, allowing multiple functional layers to coexist in a compact volume.
2Quantity of substance
If the capacitor electrode and common electrode are placed closer to increase capacitance, then the storage capacitance is improved, but the peeling risk between layers increases
Solution Approach 1:
The patent introduces multiple intermediary layers between the capacitor electrode and common electrode, including the overcoat layer and first passivation layer. These intermediary layers serve dual purposes: they maintain electrical insulation while providing mechanical bonding interfaces that distribute stress and prevent peeling, even when electrodes are positioned closely to maximize capacitance.
Solution Approach 2:
The patent employs composite layering with different material properties. The overcoat layer and passivation layers have distinct mechanical and adhesive characteristics that complement the electrode materials. This composite structure enhances interlayer bonding strength while maintaining the close electrode spacing needed for high capacitance.
3Quantity of substance
If the common electrode overlaps both capacitor electrode and pixel electrode to increase capacitance, then the storage capacitance is improved, but the capacitive coupling effect between capacitor electrode and data line increases
Solution Approach 1:
The patent applies local quality by creating asymmetric spacing relationships. The distance between the capacitor electrode and common electrode is deliberately made greater than the distance between the common electrode and pixel electrode. This localized spacing variation increases capacitance through enhanced overlap with the pixel electrode while maintaining larger separation from the data line to reduce harmful capacitive coupling.
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 effectively increases the total capacitance value of storage capacitors, improving operational electrical properties and preventing peeling issues due to adhesive force insufficiencies, thereby enhancing the display panel's performance.
Implementation Method 1
the capacitor electrode and the common electrode have a first distance therebetween in a stacking direction... the first distance is greater than the second distance
Implementation Method 2
The first passivation layer is disposed between the capacitor electrode and the overcoat layer. The second passivation layer is disposed between the common electrode and the pixel electrode.
Data Source
AI summary
A display panel including a substrate, scan lines, data lines, and pixel structures is provided. The pixel structures are electrically connected to the data lines and the scan lines. Each pixel structure includes an active device, a pixel electrode, a capacitor electrode, a common electrode, an overcoat layer, a first passivation layer and a second passivation layer. The active device is electrically connected to the pixel electrode. The capacitor electrode is electrically connected to the pixel electrode. The common electrode is located between the capacitor electrode and the pixel electrode. The common electrode, the capacitor electrode and the pixel electrode overlap with each other. The overcoat layer is disposed between the common electrode and the first passivation layer. The second passivation layer is disposed between the common electrode and the pixel electrode.