Liquid Crystal Display Uneven Electrode Structure for Viewing Angle Optimization
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Solution Overview
Problem
Liquid crystal display devices in the VA mode face issues with light transmissivity due to arbitrary alignment of liquid crystal molecules when voltage is applied, leading to deterioration in response characteristics and uneven light distribution.
Innovation Solution
A liquid crystal display device with a first electrode featuring a plurality of uneven portions, including trunk convex portions and branch convex portions, where the width of the branch convex portions narrows towards the tip, improving alignment regulation and reducing dark lines, thereby enhancing light transmissivity and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal molecules are aligned perpendicularly with respect to the substrate face in VA mode, then a wider viewing angle is realized, but the alignment of liquid crystal molecules becomes disturbed when voltage is applied, deteriorating response characteristics
Solution Approach 1:
The patent applies local quality by creating specific uneven portions (projections) at predetermined positions on the substrate to locally regulate liquid crystal molecule alignment. These uneven portions are strategically placed to control the alignment in specific regions while maintaining the overall perpendicular alignment structure, thus resolving the contradiction between wide viewing angle and good response characteristics.
2Manufacturing precision
If fine slits are provided on the electrode to control liquid crystal alignment, then alignment regulation is improved, but parts with no electric field are present in the slits, deteriorating light transmissivity
Solution Approach 1:
The patent extracts the alignment control function from the electrode structure and implements it separately through uneven portions formed on the substrate. This separation allows the electrode to remain continuous and transparent while the substrate provides the alignment regulation, thus improving light transmissivity while maintaining alignment control precision.
Solution Approach 2:
The patent introduces uneven portions on the substrate as an intermediary element between the electrode and liquid crystal molecules. These uneven portions serve as a mediator that regulates liquid crystal alignment without interfering with the electric field distribution or light transmission through the electrode, thus resolving the contradiction between alignment precision and light transmissivity.
3Stability of the object's composition
If a continuous electrode is used to apply voltage, then uniform electric field is achieved, but liquid crystal molecules align arbitrarily near electrode edges, causing dark lines and reducing uniformity
Solution Approach 1:
The patent applies local quality by introducing uneven portions at specific locations on the substrate to locally correct the electric field effect near electrode edges. These uneven portions create a preferred alignment direction for liquid crystal molecules in regions where the electric field would otherwise cause arbitrary alignment, thus eliminating dark lines while maintaining overall electric field uniformity.
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 suppresses the occurrence of dark lines, achieves high light transmissivity with improved uniformity, maintains good voltage response characteristics, reduces power consumption in the backlight, and enhances the reliability of the TFT.
Implementation Method 1
the liquid crystal molecules have negative dielectric anisotropy, that is, characteristics of the dielectric constant in the long-axis direction of the liquid crystal molecules being shorter than in the short-axis direction
Implementation Method 2
a first alignment film covering the first electrode and an opposing face of the first substrate; a second alignment film covering the second electrode and the opposing face of the second substrate
Data Source
AI summary
A liquid crystal display device includes a plurality of pixels arranged in a matrix, each pixel having: first and second substrates; a first electrode formed on an opposing face of the first substrate opposing the second substrate; a first alignment film covering the first electrode and the opposing face of the first substrate; a second electrode formed on the opposing face of the second substrate opposing the first substrate; a second alignment film covering the second electrode and the opposing face of the second substrate, and a liquid crystal layer which is provided between the first alignment film and the second alignment film and includes liquid crystal molecules, where a pretilt is imparted on the liquid crystal molecules, a plurality of uneven portions is formed on the first electrode, and a width of a portion of the convex portions provided on the first electrode becomes narrower toward the tip portion.