LCD Pixel Electrode Slits for Transmittance and Viewing Angle
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Solution Overview
Problem
Current liquid crystal display (LCD) devices face challenges in improving transmittance due to the structure of pixel and common electrodes, which affects the display's brightness and viewing angle.
Innovation Solution
The proposed LCD device features a pixel electrode structure with first unit electrodes arranged in a specific pattern, including four domains and slits, and a common electrode with defined openings, allowing for controlled tilting of liquid crystal molecules to enhance transmittance and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional pixel electrode and common electrode structures are used, then device simplicity is maintained, but transmittance and viewing angle are limited
Solution Approach 1:
The pixel electrode is divided into multiple first unit electrodes arranged in rows and columns, with each unit electrode containing four domains separated by first slits. The common electrode contains second slits corresponding to the first slits. This segmentation creates multiple domains that can independently control liquid crystal molecule orientation, improving transmittance and viewing angle while maintaining a systematic structure.
Solution Approach 2:
Different domains within the pixel electrode are configured with different orientations relative to the common electrode slits. Specifically, liquid crystal molecules in different domains are controlled to tilt in different directions (upper left, upper right, lower left, lower right), creating local variations in optical properties that improve overall transmittance and viewing angle characteristics.
2Manufacturing precision
If conventional electrode structures are used, then manufacturing simplicity is maintained, but liquid crystal molecule misalignment occurs reducing display quality
Solution Approach 1:
The first slits in the pixel electrode and second slits in the common electrode are pre-configured in specific patterns before the liquid crystal layer is formed. This preliminary arrangement guides the liquid crystal molecules to tilt in controlled directions during manufacturing, ensuring proper alignment without requiring complex post-processing steps.
Solution Approach 2:
The slits in the electrode structures serve as intermediary elements that mediate between the electrode geometry and liquid crystal molecule orientation. The first slits and second slits create electric field distributions that indirectly control the liquid crystal molecule tilting directions, achieving precise alignment through a mediating structural feature.
3Speed
If conventional electrode structures are used, then device simplicity is maintained, but response speed is limited
Solution Approach 1:
By segmenting the pixel electrode into multiple first unit electrodes with first slits, and the common electrode into regions with second slits, the electrode structure creates multiple independent domains. This segmentation allows for faster switching of liquid crystal molecules in each domain, improving overall response speed while maintaining a systematic and manufacturable structure.
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 improves the transmittance and response speed of the LCD device, ensuring uniform display quality and enhanced viewing angles by minimizing liquid crystal molecule misalignment.
Implementation Method 1
liquid crystal molecules overlapping the first domain are controlled to be tilted in an upper left direction, liquid crystal molecules overlapping the second domain are controlled to be tilted in an upper right direction, liquid crystal molecules overlapping the third domain are controlled to be tilted in a lower left direction, and liquid crystal molecules overlapping the fourth domain are controlled to be tilted in a lower right direction
Data Source
AI summary
A liquid crystal display device includes first and second substrates facing each other and including pixels, a pixel electrode disposed on the first substrate to be provided in each of the pixels, and a common electrode disposed on the second substrate, where the pixel electrode includes first unit electrodes, each of the first unit electrodes includes four domains, which are arranged in two rows in a first direction and two columns in a second direction, the four domains include first, second, third, and fourth domains of a corresponding first unit electrode, each of the first unit electrodes further includes a first slit, which is an opening defined along boundaries between the first through fourth domains, and the common electrode includes second slits, which are openings defined along outer sides of each of the first unit electrodes.