LCD Pixel Electrode Slit Angle Optimization
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Solution Overview
Problem
Conventional lateral electric field system liquid crystal display devices have a low aperture ratio due to inadequate electric field application at the ends of slits in pixel electrodes, leading to decreased transmittance and overall pixel efficiency.
Innovation Solution
The design includes pixel electrodes with a shorter length in one direction and slits angled at less than 45 degrees relative to the perpendicular direction, ensuring the slit ends are not in the long-side region, thereby improving the aperture ratio by optimizing electric field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slits are provided in the pixel electrode extending in the short-side direction, then the liquid crystal display device achieves wide viewing angle characteristics through lateral electric field, but the aperture ratio is decreased due to poor electric field application at the slit ends
Solution Approach 1:
The pixel electrode is designed with asymmetric dimensions where the first length (along the source line direction) is shorter than the second length (orthogonal direction). This asymmetry, combined with slits extending at angles ≤45° from the orthogonal direction, repositions the slit ends away from the long-side region, thereby improving aperture ratio while preserving lateral electric field characteristics for wide viewing angles
Solution Approach 2:
The patent modifies the geometric parameters of the pixel electrode by defining specific length relationships (first length < second length) and controlling the slit extension angle (≤45° from the direction perpendicular to source line). These parameter changes optimize the distribution of electric fields at slit ends, improving both aperture ratio and transmittance while maintaining the lateral electric field system's wide viewing angle advantage
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 the aperture ratio and transmittance, allowing for improved image display quality and contrast, particularly in wide viewing angles, suitable for applications like car navigation displays.
Implementation Method 1
An electric field (lateral electric field) in a direction parallel to a substrate surface is generated between the pixel electrode and the common electrode, and the lateral electric field is applied to liquid crystal to drive the liquid crystal
Implementation Method 2
the lateral electric field is applied to liquid crystal to drive the liquid crystal, whereby an amount of light transmitted through the liquid crystal layer is controlled
Data Source
AI summary
A liquid crystal display device comprises: a first data line extending in a first direction; a first pixel electrode and a second pixel electrode that are arranged in the first direction; a first transistor connected to the first pixel electrode; a second transistor connected to the second pixel electrode; and a first gate line electrically connected to the first transistor and the second transistor, wherein in the first pixel electrode, a first length along the first direction is shorter than a second length along a second direction perpendicular to the first direction, and the first pixel electrode includes at least one slit, and the slit extends at an angle of less than or equal to 45 degrees with respect to the second direction.