Liquid Crystal Display Common Electrode Slit Design
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Solution Overview
Problem
Liquid crystal display devices experience lateral image quality degradation due to electric fields generated between common electrodes and pixel electrodes, which can reduce visibility.
Innovation Solution
Incorporating a common electrode with an electric field forming portion and slit portions on a second substrate, featuring stem and branch portions that weaken the electric field intensity at the edges of pixel electrodes, thereby enhancing the alignment of liquid crystal molecules and improving lateral visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a common electrode is provided without slit portions, then the electric field is uniformly generated across the pixel electrode, but lateral image quality degradation occurs due to electric field concentration at the edges of the pixel electrode
Solution Approach 1:
The common electrode is segmented by introducing first and second slit portions that extend in different directions, dividing the continuous electrode structure into regions separated by these slits. This segmentation prevents the formation of concentrated electric fields at the pixel electrode edges by interrupting the electric field lines, thereby improving lateral visibility without compromising overall electrode functionality
Solution Approach 2:
The slit portions are strategically positioned and oriented to create localized modifications in the electric field distribution. The first slit portion extends in a first direction while the second slit portion extends in a second direction different from the first direction, creating anisotropic electric field control that specifically addresses lateral visibility issues in different orientations while maintaining appropriate field strength in other regions
2Ease of operation
If slit portions are added to the common electrode to reduce edge electric field, then lateral visibility is improved, but the device complexity increases due to the additional structural elements
Solution Approach 1:
The common electrode is segmented by introducing first and second slit portions that extend in different directions, dividing the continuous electrode structure into regions separated by these slits. This segmentation prevents the formation of concentrated electric fields at the pixel electrode edges by interrupting the electric field lines, thereby improving lateral visibility without compromising overall electrode functionality
Solution Approach 2:
Instead of modifying the pixel electrode to control electric field distribution, the invention inverts the approach by modifying the common electrode structure. The slit portions are created in the common electrode rather than the pixel electrode, achieving the desired electric field control through complementary structural modification
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
The solution effectively reduces the electric field intensity at the edges of pixel electrodes, improving lateral visibility and transmittance by up to 3.1% and reducing gamma distortion index by 0.03, thereby enhancing overall image quality.
Implementation Method 1
The liquid crystal display device generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrodes
Implementation Method 2
displays an image by determining the orientation direction of the liquid crystal molecules of the liquid crystal layer and controlling the polarization of incident light
Implementation Method 3
the electric field forming portion includes a transparent conductive material
Data Source
AI summary
A liquid crystal display device includes: a first substrate; a pixel electrode including a first sub-pixel electrode and disposed on the first substrate; a second substrate facing the first substrate; and a common electrode including an electric field forming portion and a first slit portion, and disposed on the second substrate. The electric field forming portion includes a transparent conductive material. The first slit portion includes a first stem portion extending in a first direction, a second stem portion extending in a second direction different from the first direction and crossing the first stem portion, and a branch portion extending in the first direction and located on at least one of two opposing sides in a longitudinal direction of the second stem portion. Each of the first stem portion and the branch portion has a linear shape surrounded by the electric field forming portion.