LCD Pixel Structure Asymmetric Data Line Overlap
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Solution Overview
Problem
Conventional liquid crystal display pixel structures struggle to effectively increase the aperture ratio while reducing the coupling ratio, as the reduction of parasitic capacitance between the pixel electrode and data line also decreases storage capacitance, leading to insufficient crosstalk reduction.
Innovation Solution
A pixel structure design where the pixel electrode overlaps with portions of one data line but not the other, and includes a light shielding element and a transparent electrode to increase storage capacitance, reducing the coupling ratio and crosstalk, while maintaining or enhancing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the pixel electrode overlaps with portions of the data line to increase the aperture ratio, then the aperture ratio is improved, but the parasitic capacitance between the pixel electrode and data line increases thereby increasing crosstalk
Solution Approach 1:
An organic insulating layer is introduced as an intermediary between the pixel electrode and the data line. This layer reduces the parasitic capacitance between these conductive elements while allowing the pixel electrode to maintain its overlapping position with the data line for high aperture ratio, thereby reducing crosstalk without sacrificing area utilization
Solution Approach 2:
The thickness of the organic insulating layer is optimized to achieve the desired balance between reducing parasitic capacitance and maintaining manufacturing feasibility. By adjusting this parameter, the parasitic capacitance is reduced to minimize crosstalk while keeping the structure manufacturable
2Object-generated harmful factors
If an organic insulating layer is disposed to decrease the parasitic capacitance between the pixel electrode and data line, then the crosstalk is reduced, but the storage capacitance between the pixel electrode and storage line is also reduced simultaneously
Solution Approach 1:
The organic insulating layer is selectively positioned only in regions where parasitic capacitance needs to be reduced (between pixel electrode and data line), while leaving other regions (between pixel electrode and storage line) without this layer to preserve storage capacitance. This localized application allows differential treatment of different capacitance relationships
3Area of moving object
If the pixel electrode overlaps with both data lines in a pixel region to maximize aperture ratio, then the aperture ratio is improved, but the coupling ratio increases thereby increasing crosstalk
Solution Approach 1:
The pixel electrode is designed to overlap asymmetrically with the data lines - specifically overlapping with only one data line while avoiding overlap with the other. This asymmetric configuration maximizes the aperture ratio while minimizing the parasitic capacitance and coupling ratio, thereby reducing crosstalk
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 reduces crosstalk and increases the transmission rate by minimizing parasitic capacitance and enhancing storage capacitance, thereby improving the overall performance of the liquid crystal display.
Implementation Method 1
the pixel electrode overlaps with portions of the second data line and the light shielding element without overlapping the first data line
Data Source
AI summary
A pixel structure of a liquid crystal display includes a substrate, a light shielding element, a first data line, a second data line and a pixel electrode. The light shielding element is formed on the substrate. The first and second data lines are formed along the light shielding element, and the second data line overlaps with portions of the light shielding element. The pixel electrode overlaps with portions of the first data line and the light shielding element without overlapping with the second data line.