Pixel Electrode Branch Width Variation for Black Stripe Control
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Solution Overview
Problem
The boundary between the trunk portion and branches of existing pixel electrodes is affected by a complex electric field, leading to deteriorated black stripes, which reduces liquid crystal efficiency and transmittance in liquid crystal display panels.
Innovation Solution
A pixel electrode design featuring a first sub-branch and at least one second sub-branch with different widths, arranged in an axisymmetric or center symmetric pattern, that divides the sub-pixel area into domains, with the second sub-branch's width varying along its symmetry axis to enhance the electric field and reduce black stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pattern width L of pixel electrode branches is increased to strengthen the vertical electric field and improve inclination angle, then liquid crystal efficiency is improved, but the gap S between adjacent branches decreases, causing complex electric field at boundaries and deteriorated black stripes
Solution Approach 1:
The patent applies local quality by making the sub-branches have different widths, with the first sub-branch having a smaller width than the second sub-branch. This creates a gradient structure where the electric field strength varies locally along the branch, optimizing both the overall electric field effect and the boundary region performance to prevent black stripe deterioration.
Solution Approach 2:
The patent changes the geometric parameter of the sub-branches by setting different widths for the first and second sub-branches. This parameter change optimizes the electric field distribution, allowing the boundary between trunk portion and branches to follow a more regular pattern while maintaining strong vertical electric field effects for improved liquid crystal efficiency.
2Illumination intensity
If the sum P of pattern width L and gap S is reduced to improve transmittance, then transmittance is improved, but the electric field strength at boundaries becomes insufficient, causing black stripe deterioration
Solution Approach 1:
The patent uses local quality by creating sub-branches with different widths where the first sub-branch has a smaller width and the second sub-branch has a larger width. This local variation in geometry optimizes the electric field distribution at boundaries while maintaining a small overall sum P, thereby improving transmittance without causing black stripe deterioration.
3Use of energy by moving object
If the ratio L/S is optimized to balance electric field strength and boundary effects, then liquid crystal efficiency is improved, but the design complexity increases
Solution Approach 1:
The patent applies asymmetry by designing the sub-branches with different widths, where the first sub-branch has a smaller width than the second sub-branch. This asymmetric design simplifies the overall structure compared to complex multi-dimensional variations, while still achieving optimized electric field distribution and improved liquid crystal efficiency.
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 effectively controls black stripes, increases liquid crystal efficiency, and enhances transmittance by optimizing the electric field distribution at the boundary between the trunk and branch portions of the pixel electrode.
Implementation Method 1
When the pixel electrode is energized, it can generate a tilted electric field, thereby inducing liquid crystal molecules in different regions to be inclined in different directions
Data Source
AI summary
A pixel electrode includes a first pixel electrode and a plurality of second pixel electrodes. Each of the second pixel electrodes includes a first sub-branch and a second sub-branch, one end of the second sub-branch is connected to the first pixel electrode, and the opposite end is connected to the first sub-branch. The first width of the first sub-branch is different from the second width of the second sub-branch. By changing a width of a branch at a junction with a trunk portion, it is possible to effectively control black stripes, thereby improving liquid crystal efficiency and a transmittance of a liquid crystal display panel.