Convex Substrate Sections Stabilize Liquid Crystal Tilt
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Solution Overview
Problem
Conventional vertically aligned liquid crystal display devices experience instability in the tilt direction of liquid crystal molecules when voltage is applied, leading to display graininess due to variance in tilted orientations of liquid crystal molecules across pixels.
Innovation Solution
The introduction of convex sections on the substrate, formed from the same material as the thin film transistors, which protrude further than other regions of the pixel electrodes, stabilizes the tilt of liquid crystal molecules towards the center from the border, improving alignment and reducing graininess by altering the electric field distribution across the pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vertically aligned liquid crystal display device structure is used, then the device is simple in structure, but the liquid crystal molecule tilt direction becomes unstable causing display graininess
Solution Approach 1:
The invention introduces convex sections with different shapes (circular, rectangular, triangular, or elliptical cross-sections) at specific locations on the substrate to locally modify the electric field distribution. These convex sections have different properties from the surrounding flat substrate regions, creating localized effects that stabilize liquid crystal molecule tilt directions without requiring changes to the entire substrate structure.
Solution Approach 2:
The invention adds a vertical dimension to the substrate surface by forming convex sections that protrude from the substrate. This three-dimensional structure modifies the electric field distribution in the vertical direction, creating stable tilt directions for liquid crystal molecules without complicating the planar two-dimensional substrate layout.
2Measurement precision
If pixel electrode horizontal to vertical ratio is increased, then the display resolution is improved, but the liquid crystal molecule alignment becomes unstable causing graininess
Solution Approach 1:
The convex sections are strategically positioned at specific locations within each pixel electrode region to locally control the electric field. This localized approach maintains stable liquid crystal alignment even when the overall pixel electrode dimensions are adjusted to achieve higher resolution displays.
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 ensures stable tilt of liquid crystal molecules, enhancing image quality and resolution by minimizing graininess and maintaining alignment even with increased horizontal to vertical pixel electrode ratios.
Implementation Method 1
a liquid crystal layer having negative dielectric anisotropy
Implementation Method 2
by applying voltage between the electrodes
Data Source
AI summary
A liquid crystal display device provides, on the internal side of one substrate of a pair of substrates a plurality of pixel electrodes, a plurality of TFTs, a plurality of scan lines and signal lines, and a plurality of convex sections each formed on the internal side of the other substrate so as to be located substantially on a center part of each of the plurality of predetermined regions provided in each of the plurality of pixels. Further, the liquid crystal display device provides an opposing electrode on the internal side of the one substrate. Then, the liquid crystal display device provides vertical alignment films on the respective internal sides of the pair of substrates, and a liquid crystal layer having negative dielectric anisotropy and inserted in the gap between the pair of substrates.