Curved Driver Connection Lines for LCD Thickness Uniformity
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Solution Overview
Problem
The existing thin film transistor array panels in liquid crystal displays suffer from display quality deterioration due to thickness differences in material layers caused by direction changes in driver connection lines, leading to spots in the display area along the normal line direction of imaginary straight lines.
Innovation Solution
The solution involves forming driver connection lines with curved line shapes at boundary portions between oblique line portions and second connection portions, ensuring a ratio of maximum to minimum distance from a reference straight line exceeds 20% or 24%, preventing straight line formations that align with centrifugal forces during spin coating, thereby preventing material layer accumulation and display quality issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If driver connection lines are formed with straight lines connecting data lines and data driver, then the connection structure is simple and easy to manufacture, but material layers coated by spin coating method have ununiform thickness causing spots in the display area
Solution Approach 1:
The patent applies curvature by designing the driver connection lines to follow a curved path (e.g., arc-shaped) instead of straight lines. This curvature prevents the formation of imaginary straight lines that would otherwise cause material layer thickness variations during spin coating, thereby eliminating spots in the display area while maintaining manufacturing simplicity
Solution Approach 2:
The patent applies local quality by specifically modifying only the shape of the driver connection lines in the peripheral area where they connect to data lines, while keeping the rest of the display structure unchanged. This localized modification targets the specific problem area without affecting other components
2Device complexity
If direction change portions of driver connection lines form an imaginary straight line, then the layout is regular and easy to design, but the material layer thickness becomes ununiform along the normal line direction
Solution Approach 1:
The patent replaces the straight-line arrangement of direction change portions with a curved configuration. The curved driver connection lines ensure that no imaginary straight line can be formed by connecting direction change portions, thereby preventing the centrifugal force during spin coating from causing systematic thickness variations along any straight line direction
Solution Approach 2:
The patent introduces asymmetry by using curved lines with varying radii and angles for different driver connection lines. This asymmetric curved design breaks the symmetry that would otherwise create aligned thickness variations, ensuring more uniform material layer deposition across the display area
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 prevents display quality deterioration by disrupting the alignment of material layer height differences, ensuring uniform thickness and reducing spot formation in the display area.
Implementation Method 1
When the direction change portions of a plurality of driver connection lines form an imaginary straight line, the material layer that is coated by the spin coating method may have an ununiform thickness due to the direction change portions
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes: a substrate; a plurality of gate lines and a plurality of data lines disposed at a display area; a data driver; and a plurality of driver connection lines disposed at a peripheral area and connecting the plurality of data lines and the data driver, wherein the plurality of driver connection lines include a plurality of first connection portions connected to the plurality of data lines, a plurality of second connection portions connected to the data driver, and a plurality of oblique line portions disposed between the plurality of first connection portions and the plurality of second connection portions, and an imaginary line connecting a plurality of direction change portions disposed at a boundary portion between the plurality of second connection portions and the plurality of oblique line portions does not have a straight line.