Liquid Crystal Display Electrode Oblique Opening Geometry
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Solution Overview
Problem
The manufacturing of liquid crystal display apparatuses faces issues with electrode disconnection due to variance in etching accuracy, which can be mitigated by adjusting etching rates or spacing between openings, but these solutions compromise production efficiency and display uniformity.
Innovation Solution
The design features a first and second electrode with openings that have obliquely crossing short-side edges, allowing for increased spacing between openings while maintaining a high aperture ratio, preventing disconnection and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the etching rate is decreased to prevent openings from joining together, then electrode disconnection is prevented, but production efficiency decreases
Solution Approach 1:
The patent applies asymmetry by configuring the openings with oblique short-side edges that cross the longitudinal direction at non-orthogonal angles. This asymmetric geometry increases the effective spacing between adjacent openings in the longitudinal direction without requiring larger overall opening dimensions, thereby preventing electrode disconnection while maintaining normal etching rates and production efficiency
Solution Approach 2:
The patent resolves the contradiction by transitioning from a conventional orthogonal opening configuration to an oblique configuration where the short-side edges cross the longitudinal direction at angles between 45° and 135°. This dimensional change in the opening orientation effectively increases the spacing between openings in the longitudinal direction without increasing the opening width, thus preventing disconnection while maintaining etching efficiency
2Reliability
If the longitudinal direction spacing between openings is increased to prevent disconnection, then electrode disconnection is prevented, but the opening width must be increased which decreases aperture ratio
Solution Approach 1:
The patent uses asymmetry by orienting the opening short-side edges obliquely relative to the longitudinal direction. This asymmetric arrangement allows the openings to be positioned closer together in terms of overall footprint while maintaining sufficient effective spacing in the longitudinal direction to prevent disconnection, thereby preserving both electrode reliability and high aperture ratio
Solution Approach 2:
The patent resolves this contradiction by changing the dimensional orientation of the openings from orthogonal to oblique. The short-side edges cross the longitudinal direction at angles between 45° and 135°, which effectively increases the longitudinal spacing between openings without increasing the opening width, thus maintaining both electrode connection reliability and high aperture ratio
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 prevents electrode disconnection by allowing for longer short-side edges and increased spacing between openings, addressing the challenges of etching accuracy and display uniformity without reducing production efficiency.
Implementation Method 1
a fringe electric field (an oblique electric field) is generated in two different directions by an action of each opening, and applied to the liquid crystal layer, thereby causing a dual-domain alignment structure to be produced in the liquid crystal layer
Data Source
AI summary
To provide a technique that prevents electrode disconnection in a liquid crystal display apparatus comprising a plurality of openings in an electrode. The apparatus comprises a first substrate, a second substrate, a first electrode, a second electrode, and a liquid crystal layer. The first electrode comprises first openings and the second electrode comprises second openings. Each first opening is disposed forming columns so that the respective longitudinal directions align with a first direction, and comprises two short-side edges that obliquely cross the first direction at an angle other than orthogonal. Each opening is disposed forming columns so that the respective longitudinal directions align with the first direction, and comprises two short-side edges that obliquely cross the first direction at an angle other than orthogonal. The first openings and second openings are alternately disposed column by column along a second direction that crosses the first direction.