Liquid Crystal Display Sub-Pixel Electrode Design for Kickback Voltage Reduction
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Solution Overview
Problem
Vertical alignment mode liquid crystal displays (LCDs) face issues with poor lateral visibility and irregular textures due to kickback voltage and the decentralization of liquid crystal molecule tilt directions, which are exacerbated by spacing pixel electrodes and gate lines, leading to decreased display quality.
Innovation Solution
The implementation of a liquid crystal display design featuring gate lines and data lines on a first substrate, with pixel electrodes divided into sub-pixels separated by gaps, and a common electrode on a second substrate, where the second sub-pixel electrode includes fine branch portions and notches to control liquid crystal molecule alignment, reducing kickback voltage and preventing irregular textures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If pixel electrodes and gate lines are spaced apart to reduce kickback voltage, then kickback voltage is reduced, but liquid crystal molecules near gate lines are not affected by tilt direction determining members, producing irregular texture
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode). Each sub-pixel electrode includes fine branch portions that extend toward the gate line, ensuring that liquid crystal molecules near the gate line are still affected by tilt direction determining members even when the pixel electrode is spaced apart from the gate line, thus reducing kickback voltage while preventing irregular texture
Solution Approach 2:
Different regions of the pixel electrode structure have different functions: the fine branch portions are designed to extend toward the gate line to control liquid crystal alignment in the vicinity of gate lines, while the main body of the sub-pixel electrodes maintains spacing from the gate lines to reduce kickback voltage. This local differentiation resolves the contradiction between reducing kickback voltage and maintaining liquid crystal alignment precision
2Illumination intensity
If pixel electrodes are divided into sub-pixels to improve lateral visibility, then lateral visibility is improved, but device complexity increases
Solution Approach 1:
The pixel electrode is segmented into multiple sub-pixel electrodes that can be independently controlled with different voltages, enabling improved lateral visibility through differential voltage application. The segmentation is achieved by dividing the pixel electrode into first and second sub-pixel electrodes with fine branch portions
Solution Approach 2:
The fine branch portions of adjacent sub-pixel electrodes are merged or closely positioned to collectively control the liquid crystal molecules in the region near the gate lines. This merging approach allows multiple sub-pixels to work together to maintain alignment precision while each sub-pixel independently contributes to lateral visibility improvement
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 enhances lateral visibility by adjusting voltages between sub-pixels and stabilizes liquid crystal molecule alignment, preventing irregular textures and maintaining image quality, thereby improving the overall display performance.
Implementation Method 1
The electric field determines the orientation of liquid crystal molecules in the liquid crystal layer, and this orientation controls the polarization of incident light so as to form an image
Implementation Method 2
The LCD induces an electric field in the liquid crystal layer by applying voltages to the field generating electrodes
Implementation Method 3
a vertical alignment (VA) mode LCD is used in which the longitudinal axes of the liquid crystal molecules are arranged to be perpendicular to the display panels in a state where the electric field is not applied
Data Source
AI summary
The present invention relates to a liquid crystal display that includes: gate lines and data lines arranged on a first substrate; pixel electrodes connected to the gate lines and the data lines, and including a first sub-pixel electrode and a second sub-pixel electrode separated from each other by a gap; a common electrode arranged on a second substrate, and facing the pixel electrodes; and a liquid crystal layer disposed between the pixel electrodes and the common electrode and including a plurality of liquid crystal molecules, wherein each of the first sub-pixel electrode and the second sub-pixel electrode includes a plurality of fine branch portions, the second sub-pixel electrodes include a connection portion surrounding the fine branch portions of the first sub-pixel electrodes, and a plurality of notches are formed in the connection portion of the second sub-pixel electrode.