Pixel Device Parallel MIM MOS Capacitors Area Constraint
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Solution Overview
Problem
Conventional pixel devices face a reduction in storage capacitor capacitance when the area is decreased, leading to inefficient use of space and a need to maintain or increase capacitance without expanding the device area.
Innovation Solution
The implementation of a pixel device with parallel-connected capacitors, including a metal-insulator-metal (MIM) and metal-oxide-silicon (MOS) structure, within the existing space to enhance capacitance, utilizing different metal and poly-silicon layers with dielectrics to maintain capacitance even as the panel size decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the pixel device area is decreased, then the device becomes more compact, but the storage capacitor capacitance decreases
Solution Approach 1:
The patent implements nested capacitors where a first capacitor is formed within the same pixel device area as a second capacitor. The first capacitor uses a first electrode and second electrode with first and second insulators, while the second capacitor uses the second electrode as a shared electrode with a third electrode and additional insulators. This nesting allows both capacitors to occupy overlapping spatial regions, effectively doubling the capacitance without increasing the pixel area.
Solution Approach 2:
The patent transitions from a single-plane capacitor structure to a multi-layer three-dimensional structure by stacking electrodes and insulators vertically. Multiple capacitor structures are formed in different layers within the same planar footprint, utilizing the vertical dimension to increase total capacitance while maintaining a compact pixel area.
2Device complexity
If a single capacitor structure is used, then the device complexity is reduced, but the capacitance is insufficient for maintaining voltage
Solution Approach 1:
The patent merges two capacitor structures into a single integrated unit where the second electrode serves as a shared component for both capacitors. This merging approach increases total capacitance while minimizing the increase in device complexity by reusing common electrodes and insulator layers rather than completely duplicating separate capacitor structures.
Solution Approach 2:
The second electrode performs multiple functions: it serves as one electrode for the first capacitor and simultaneously as the other electrode for the second capacitor. This multi-functionality increases the effective capacitance without proportionally increasing the number of discrete components, thereby managing device complexity efficiently.
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 approach effectively increases capacitance without increasing the pixel device area, ensuring the necessary capacitance is maintained even when the panel size is reduced, optimizing space utilization and performance.
Implementation Method 1
a capacitor comprising a first metal layer, a second metal layer, a first dielectric between the first metal layer and the second metal layer
Implementation Method 2
a first dielectric between the first metal layer and the second metal layer; a second dielectric between the first poly-silicon layer and the electrode layer
Data Source
AI summary
A pixel device capable of composing a panel is provided herein. The pixel device includes a first switch, a first capacitor, and a second capacitor. The first switch delivers a pixel signal to a pixel electrode according to a control signal. The first capacitor has a first part of a first metal layer, a second metal layer, and a first dielectric coupled between the first part of the first metal layer and the second metal layer. The second capacitor has a first poly-silicon layer, an electrode layer, and a second dielectric coupled between the first poly-silicon layer and the electrode layer. The first and the second capacitors are parallel connected without increasing the area of the pixel and serve as a storage capacitor. Therefore, the pixel device can obtain more overall storage capacitance.