Pixel Structure With Unequal Dielectric Thickness For LCD Panels
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Solution Overview
Problem
Conventional fringe field switching (FFS) LCD panels face a trade-off between liquid crystal (LC) efficiency and capacitive load, where thinner dielectric layers enhance LC efficiency but increase capacitive load, and thicker layers reduce LC efficiency but lower power consumption.
Innovation Solution
A pixel structure with a dielectric layer of unequal thickness, featuring island structures and branch electrodes, where the gap between adjacent branch electrodes is greater than the gap between adjacent island structures, optimizing LC efficiency without increasing capacitive load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thickness of the dielectric layer is made thinner, then liquid crystal efficiency is improved, but capacitive load between the common electrode and data line increases
Solution Approach 1:
The dielectric layer is designed with different thicknesses in different regions: a first thickness in the pixel region and a second thickness in the data line region. This local differentiation allows the pixel region to have thin dielectric for high LC efficiency while the data line region has thick dielectric for low capacitive load, thus resolving the contradiction between these two requirements.
Solution Approach 2:
The dielectric layer is segmented into multiple regions with different thickness characteristics. The pixel region and data line region are separated into distinct zones with optimized dielectric thickness for their respective functions, enabling independent optimization of LC efficiency and capacitive load without compromise.
2Use of energy by moving object
If the thickness of the dielectric layer is made thicker, then capacitive load is reduced, but liquid crystal efficiency deteriorates
Solution Approach 1:
Different regions of the dielectric layer are assigned different thickness values optimized for their specific functions. The pixel region uses thin dielectric to maximize LC efficiency, while the data line region uses thick dielectric to minimize capacitive load, thereby resolving the trade-off between these conflicting requirements.
Solution Approach 2:
The dielectric layer structure is segmented into functionally distinct regions with different thickness characteristics, allowing the pixel region to achieve high LC efficiency through thin dielectric while the data line region achieves low capacitive load through thick dielectric.
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 improves LC efficiency significantly while maintaining low capacitive load, as demonstrated by simulations showing increased transmittance and aperture ratio with specific ratios of gap and thickness ratios.
Implementation Method 1
The first dielectric layer is disposed on the first electrode, and the first dielectric layer has at least one first island structure
Data Source
AI summary
A pixel structure includes a substrate, a plurality of gate lines and data lines, and at least one first pixel. The gate lines and the data lines are disposed on the substrate. The first pixel is disposed on the substrate and electrically connected to corresponding gate line and data line. The first pixel includes a first electrode, a first dielectric layer and a second electrode. The first electrode is disposed on the substrate. The first dielectric layer is disposed on the first electrode, and the first dielectric layer has at least one first island structure. The second electrode is disposed on a top surface of the first island structure, and the second electrode partially exposes the top surface of the first island structure.