Electro-Optical Device Maintaining Capacitor Segmentation
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Solution Overview
Problem
In liquid crystal devices, the capacitance value of maintaining capacitors becomes insufficient with advancements in high-resolution and high-definition displays, leading to deteriorated display quality and voltage fluctuations during high-speed driving, causing issues like flickering.
Innovation Solution
The implementation of a three-capacitive element configuration, where the first and second capacitive elements are positioned between the transistor and source line, and the third capacitive element is positioned between the source line and pixel electrode, with a fixed potential line disposed between the source line and each capacitive element, enhancing the maintaining capacitor and reducing voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance value of maintaining capacitors is increased to maintain pixel potential in high-resolution displays, then display quality is improved, but device complexity increases due to additional capacitive elements
Solution Approach 1:
The maintaining capacitor is divided into three separate capacitive elements (first, second, and third capacitive elements) positioned at different locations: two between the transistor and source line, and one between the source line and pixel electrode. This segmentation allows the total capacitance to be distributed across multiple locations, achieving the required capacitance value while maintaining manageable structural complexity through systematic arrangement.
Solution Approach 2:
The capacitive elements are arranged in different spatial positions relative to the source line - some on the transistor side and others on the pixel electrode side. This multi-dimensional spatial arrangement allows the maintaining capacitor to be constructed using existing structural spaces in the display device, avoiding additional complexity while achieving the required capacitance.
2Productivity
If high-speed driving is implemented in high-resolution displays, then productivity is improved, but voltage fluctuation increases causing display quality deterioration
Solution Approach 1:
The maintaining capacitor is segmented into three capacitive elements positioned at different locations along the signal path. This segmentation distributes the capacitance effect throughout the circuit, providing more uniform voltage stabilization during high-speed driving operations, thereby reducing voltage fluctuations and maintaining display quality stability.
3Reliability
If three capacitive elements are positioned at different locations, then maintaining capacitor is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The capacitive elements are designed to work together as a unified maintaining capacitor system, where each element contributes to the total capacitance. The fixed potential line serves as a common reference for all three capacitive elements, creating a standardized configuration that simplifies manufacturing by providing consistent design parameters across all elements, thereby reducing precision requirements despite the multi-element structure.
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 effectively maintains pixel potential, suppresses display quality deterioration, and enables high-speed driving in high-resolution displays like 4K2K, while minimizing the influence of voltage fluctuations on the pixel electrode, resulting in improved display quality.
Implementation Method 1
a first capacitive element comprising a first electrode electrically connected to the fixed potential line, a first capacitance film, and a second electrode, a second capacitive element comprising the second electrode, a second capacitance film, and a third electrode electrically connected to the fixed potential line
Data Source
AI summary
An electro-optical device includes a substrate, a transistor over the substrate, a pixel electrode over the transistor, a source line between the transistor and the pixel electrode, a fixed potential line over the substrate, a first capacitive element comprising a first electrode electrically connected to the fixed potential line, a first capacitance film, and a second electrode, a second capacitive element comprising the second electrode, a second capacitance film, and a third electrode electrically connected to the fixed potential line, a third capacitive element comprising the fixed potential line, a third capacitance film, and a fourth electrode. The first capacitive element and the second capacitive element are provided between the transistor and the source line, and the third capacitive element is provided between the source line and the pixel electrode.