P-Type Liquid Crystal Display Asymmetric Electrode Responsivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display technologies, such as VA and IPS/FFS modes, face challenges with responsivity and image persistence, particularly in mobile devices where power efficiency is crucial, and the OCB mode requires additional driving circuits, while the TBA mode suffers from image persistence and low transmittance due to dielectric films.
Innovation Solution
A liquid crystal display device with p-type liquid crystals in a vertical alignment, featuring linear pixel electrodes and common electrodes on both substrates, where the second common electrode overlaps the first in planar projection, enabling a half-bend alignment and improved responsivity without the need for dielectric films, thus enhancing transmittance and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If VA mode or IPS/FFS mode is used to achieve wide viewing angle and high contrast, then viewing angle and contrast are improved, but responsivity is insufficient and moving image display is problematic
Solution Approach 1:
The patent employs asymmetric electrode configuration where the first common electrode is positioned closer to the pixel electrode than the second common electrode. This asymmetric arrangement creates a non-uniform electric field distribution that enables faster liquid crystal response while maintaining the vertical alignment mode's high contrast and wide viewing angle characteristics
Solution Approach 2:
The patent introduces a third dimension by positioning common electrodes on both the first substrate and second substrate, creating a three-dimensional electric field structure. This spatial arrangement allows the electric field to act on liquid crystal molecules from multiple directions, improving response speed without compromising the optical performance
2Speed
If OCB mode is used to improve responsivity and adapt to moving image display, then response speed is improved, but additional driving circuits are required increasing cost and power consumption
Solution Approach 1:
The patent enables the liquid crystal display to achieve fast response characteristics through its own structure design rather than requiring external assistance. The asymmetric common electrode configuration and dual-substrate electrode arrangement create self-enhancing electric field effects that improve response speed without needing additional driving circuits or complex control mechanisms
Solution Approach 2:
The patent modifies the electrical parameters by creating different electric field strengths at different locations through the asymmetric electrode positioning. The first common electrode being closer to the pixel electrode creates a stronger local electric field that accelerates liquid crystal response, achieving OCB-like performance through parameter optimization rather than mode change
3Stability of the object's composition
If dielectric film is provided on common electrode in TBA mode to improve alignment, then alignment is improved, but image persistence occurs due to DC imbalance and transmittance lowers
Solution Approach 1:
The patent removes the dielectric film from the common electrode structure that causes DC imbalance and image persistence in conventional TBA mode. By eliminating this problematic layer while maintaining the asymmetric electrode configuration, the patent achieves stable liquid crystal alignment through the electric field geometry alone, avoiding the harmful side effects of dielectric films
Solution Approach 2:
The patent converts the potential harm of missing dielectric film protection into a benefit by using the asymmetric electrode arrangement to provide sufficient alignment control. The non-uniform electric field created by the asymmetric positioning compensates for the absence of dielectric film, achieving stable alignment without DC imbalance or image persistence
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 enhances response speed and transmittance compared to VA and IPS/FFS modes, reduces image persistence, and allows for a more compact cell gap, making it suitable for mobile devices without the need for additional driving circuits or dielectric films.
Implementation Method 1
a liquid crystal layer held between the first and second substrates, formed of a p-type liquid crystal material, and configured to take a vertical alignment in a state in which no electric field is applied
Implementation Method 2
a first common electrode provided on the first substrate, and formed in a manner to surround or sandwich the pixel electrode with a predetermined spacing; and a second common electrode provided on the second substrate, having substantially the same planar shape as the first common electrode, and formed such that at least a part of the second common electrode overlaps the first common electrode in planar projection
Data Source
AI summary
A liquid crystal display device includes: first and second substrates disposed to be opposed to each other; a liquid crystal layer held between the first and second substrates, formed of a p-type liquid crystal material, and configured to take a vertical alignment in a state in which no electric field is applied; one or a plurality of linear pixel electrodes provided on the first substrate; a first common electrode provided on the first substrate, and formed in a manner to surround or sandwich the pixel electrode with a predetermined spacing; and a second common electrode provided on the second substrate, having substantially the same planar shape as the first common electrode, and formed such that at least a part of the second common electrode overlaps the first common electrode in planar projection.