Liquid Crystal Display Electrode Protrusions for Response Time
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Solution Overview
Problem
Conventional FFS mode liquid crystal display devices have slow response times due to weak electric fields in certain areas, leading to long rise and decay times, and suffer from low contrast ratios and viewing angles.
Innovation Solution
The design of a liquid crystal display device with a lower substrate featuring two-layered electrodes that can apply three different voltages, including a pair of comb electrodes with protrusions on the branch parts, allowing for a faster response and improved contrast ratio by generating a stronger electric field and stabilizing liquid crystal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional FFS mode electrode structure is used, then wide viewing angle characteristics are achieved, but response time becomes slow due to weak electric fields in certain areas
Solution Approach 1:
The patent introduces protrusions at specific locations (branch parts of comb electrodes) to create localized electric field enhancement. This allows different regions of the electrode structure to have different functional characteristics - the protrusion regions generate stronger electric fields for faster response, while other regions maintain the wide viewing angle characteristics of conventional FFS mode.
Solution Approach 2:
The patent adds a third electrode layer to create a two-layered electrode structure. This dimensional addition enables independent control of electric field distribution in different spatial regions, allowing simultaneous optimization of response time (through protrusions in one layer) and viewing angle (through the overall FFS electrode arrangement).
2Area of stationary object
If conventional FFS mode electrode structure is used, then aperture ratio is increased, but contrast ratio remains low
Solution Approach 1:
The protrusions are strategically positioned at branch parts of comb electrodes where electric field enhancement is most needed for improving contrast ratio, without interfering with the overall aperture ratio. This localized modification allows contrast improvement in specific regions while preserving the high aperture ratio achieved by FFS mode electrode design.
3Stability of the object's composition
If voltage is reduced to improve liquid crystal alignment stability, then alignment stability improves, but electric field strength becomes insufficient for fast response
Solution Approach 1:
The protrusions create localized electric field enhancement zones that provide sufficient field strength for fast response only where needed (at the electrode-liquid crystal interface regions), while allowing lower overall voltage levels that maintain liquid crystal alignment stability in the bulk liquid crystal layer.
Solution Approach 2:
The protrusions act as intermediary structures that mediate between the electrode and the liquid crystal layer, concentrating the electric field at critical interface regions to enable fast response without requiring high overall voltage that would destabilize liquid crystal alignment.
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 achieves a faster response, higher contrast ratio, and wider viewing angles by enhancing the electric field strength and maintaining liquid crystal alignment stability, even at reduced voltage levels.
Implementation Method 1
a liquid crystal layer including a plurality of liquid crystal molecules interposed between them; a plurality of gate bus lines and data bus lines formed on the first transparent insulating substrate and arranged in a matrix form to define a unit pixel
Implementation Method 2
liquid crystal molecules having positive or negative anisotropy of dielectric constant are aligned in parallel with the substrate surface and a transverse electric field is applied to a liquid crystal layer
Implementation Method 3
a pixel electrode arranged in each unit pixel to generate a fringe field together with the counter electrode, being insulated with the counter electrode and made of transparent conductor
Implementation Method 4
the liquid crystal in decay time (a time interval needed for the display state to change from a bright state (white display) to a dark state (black display)) is made to respond by the viscoelasticity thereof with no more electric fields generated
Data Source
AI summary
The liquid crystal display device of the present invention includes: upper and lower substrates; and a horizontal alignment type liquid crystal layer, the lower substrate including electrodes, the electrodes including a first electrode, a second electrode present in a different layer from the first electrode, and a third electrode present in a different layer from the first electrode, the first electrode including a plurality of linear sections, the second electrode and the third electrode constituting a pair of comb electrodes, each of the comb electrodes including a trunk part and a plurality of branch parts diverging from the trunk part, at least one of the plurality of branch parts of the third electrode including a protruding part that makes the branch part partially wide, between two intersections with a plurality of linear sections of the first electrode in a plan view of the lower substrate.