Stacked Capacitance Electrodes for HD Display Stability
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Solution Overview
Problem
In high-definition liquid crystal displays, securing a stable capacitance value for storage capacitors is challenging due to reduced electrode areas, leading to display abnormalities like uneven brightness.
Innovation Solution
The electro-optical device incorporates a pixel capacitor with at least three storage capacitors electrically connected in parallel, featuring five capacitance electrodes stacked with dielectric films in between, and two electrodes on odd-numbered layers connected to a common capacitance line through a contact hole, simplifying the pixel structure and increasing electrode areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is decreased to achieve high definition display quality, then the resolution is improved, but the area of the capacitance electrodes is reduced, making it difficult to secure a stable capacitance value
Solution Approach 1:
The patent transitions from a planar arrangement of capacitance electrodes to a three-dimensional stacked configuration. By stacking multiple capacitance electrodes (first, second, third, fourth, and fifth capacitance electrodes) vertically with dielectric films between them, the electrode area is effectively increased without expanding the pixel footprint, thereby maintaining stable capacitance values in high-definition displays with smaller pixels.
Solution Approach 2:
The patent implements a nested structure where multiple capacitance electrodes are stacked vertically within the same pixel area. The first and second capacitance electrodes form a first storage capacitor, the third and fourth capacitance electrodes form a second storage capacitor, and the second and fourth capacitance electrodes form a third storage capacitor. This nested arrangement maximizes the use of available space while ensuring sufficient capacitance.
2Reliability
If multiple storage capacitors are provided to secure capacitance value, then the capacitance stability is improved, but the number of contact portions increases, complicating the pixel structure
Solution Approach 1:
The patent merges multiple contact functions into a single common contact hole. The common contact hole electrically connects the first, third, and fifth capacitance electrodes to a common capacitance line, thereby reducing the number of contact holes and simplifying the pixel structure while still providing multiple storage capacitors for stable capacitance values.
Solution Approach 2:
The common contact hole serves multiple functions by simultaneously connecting multiple capacitance electrodes (first, third, and fifth electrodes) to the common capacitance line. This multi-functional design reduces the overall number of contact portions required in the pixel structure.
3Measurement precision
If the area of the capacitance electrode is limited to maintain high definition pixel density, then the pixel density is improved, but the capacitance value of the storage capacitor is reduced, affecting display quality
Solution Approach 1:
The patent resolves this contradiction by extending the capacitance electrode structure into the third dimension through vertical stacking. Multiple capacitance electrodes are arranged in layers with dielectric films between them, effectively increasing the total electrode area and capacitance value without increasing the planar footprint, thus maintaining high pixel density while ensuring sufficient capacitance for display quality.
Solution Approach 2:
The patent employs composite structures combining multiple capacitance electrodes and dielectric films in a stacked configuration. This composite arrangement creates multiple storage capacitors within a compact volume, providing sufficient total capacitance while maintaining small pixel size for high definition displays.
Data Source
AI summary
A liquid crystal device which is used as an electro-optical device according to the present embodiment includes at least five capacitance electrodes that are stacked on a substrate in a state where dielectric films are interposed therebetween. Two capacitance electrodes which are stacked on odd-numbered layers among the at least five capacitance electrodes are electrically connected to a capacitance line through a contact hole that is a common contact hole.