Nested Sub-Pixel Electrodes for LCD Coupling Capacitance Reduction
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Solution Overview
Problem
Conventional LCD devices face issues with poor lateral visibility and display characteristics due to uncontrolled liquid crystal molecule movement and mismatched coupling capacitances between sub-pixel electrodes and data lines, leading to light leakage and vertical or horizontal stripes.
Innovation Solution
The implementation of an LCD device structure where the second sub-pixel electrode surrounds the first sub-pixel electrode, overlapping the data lines to minimize coupling capacitances and prevent light leakage, thereby enhancing display quality without alternating A-type and B-type pixels in the array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the sub-pixel electrode edges have protrusions overlapping with adjacent data lines to prevent textures, then display uniformity is improved, but coupling capacitance between sub-pixel electrode and data lines increases
Solution Approach 1:
The sub-pixel electrode is divided into a first sub-pixel electrode and a second sub-pixel electrode that surrounds it. This segmentation allows the first electrode to have protrusions for preventing textures while the second electrode provides a larger overlapping area with data lines to reduce coupling capacitance effects.
Solution Approach 2:
The second sub-pixel electrode surrounds the first sub-pixel electrode, creating a nested configuration. This nested structure enables the inner electrode to maintain display uniformity through protrusions while the outer electrode reduces coupling capacitance by distributing the electric field over a larger area.
2Device complexity
If liquid crystal molecule movement above data lines is not precisely controlled, then device complexity is reduced, but light leakage occurs and display characteristics deteriorate
Solution Approach 1:
The harmful effect of uncontrolled liquid crystal movement is extracted and addressed by the second sub-pixel electrode, which surrounds the first electrode and provides additional control over liquid crystal molecules above data lines, preventing light leakage without adding complex control mechanisms.
Solution Approach 2:
The second sub-pixel electrode acts as an intermediary structure between the first sub-pixel electrode and the liquid crystal layer, providing indirect control over liquid crystal molecule alignment and preventing light leakage through its surrounding configuration.
3Manufacturing precision
If coupling capacitance between sub-pixel electrode and data lines is not reduced, then manufacturing precision is maintained, but display characteristics deteriorate due to mismatched capacitances
Solution Approach 1:
Dividing the sub-pixel electrode into first and second electrodes allows the first to maintain precise positioning for manufacturing while the second provides a larger area to reduce coupling capacitance, thereby improving display characteristics without compromising manufacturing precision.
Solution Approach 2:
The second sub-pixel electrode extends in a dimensional direction by surrounding the first electrode, increasing the overlapping area with data lines in a planar dimension and thereby reducing coupling capacitance effects while maintaining the same vertical structure and manufacturing precision.
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 reduces coupling capacitances and light leakage, improving lateral visibility and display characteristics by ensuring uniform voltage maintenance across liquid crystal capacitors and enhancing the aperture ratio of the LCD device.
Implementation Method 1
LCD devices generate an image by applying a voltage to the electric field generation electrodes in order to generate an electric field, altering an alignment of liquid crystal molecules in the liquid crystal layer using the electric field
Implementation Method 2
altering an alignment of liquid crystal molecules in the liquid crystal layer using the electric field and controlling a polarization of incident light
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
The liquid crystal display device includes a first insulation substrate (10), a gate line (22) which is disposed on the first insulation substrate and extends in a first direction, first (62a) and second data lines (62b) which are insulated from the gate line (22) and extend in a second direction and intersect the gate line (22), a pixel electrode (82) which includes first (82a) and second sub-pixel (82b) electrodes which are each provided with different data voltages via a first (26a,65a,66a) and a second thin-film transistor (26b,65b,66b) connected to the first and second data lines (62a,62b), respectively, and which are separated from each other by a gap (83), the second sub-pixel electrode (82b) at least partially overlapping the first and second data lines (62a,62b), a second insulation substrate (100) which faces the first insulation substrate, a black matrix (94) which is disposed on the second insulation substrate and has an irregular shape and extends substantially along the first and second data lines (62a,62b) and a liquid crystal layer (120) which is interposed between the first and second insulation substrates.