Electrostatic Preventing Pattern in Horizontal Field LCD
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Solution Overview
Problem
Horizontal electric field mode liquid crystal displays suffer from external electrostatic field induction on the upper substrate, leading to undesirable liquid crystal molecule arrangement and image distortion due to the lack of electrostatic discharge.
Innovation Solution
Incorporation of an electrostatic preventing pattern on the second substrate, which overlaps with the shielding portion of the common electrode, enhancing the intensity of the horizontal electric field and improving light transmittance by preventing external electrostatic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic preventing pattern is added to the second substrate, then external electrostatic field discharge is improved, but device complexity increases
Solution Approach 1:
The electrostatic preventing pattern is segmented into multiple discrete patterns arranged in a matrix corresponding to gate lines and data lines, rather than using a continuous shielding layer. This segmentation provides effective electrostatic discharge paths at critical locations while minimizing overall material usage and structural complexity.
Solution Approach 2:
The electrostatic preventing patterns are selectively placed only at locations where electrostatic discharge is most critical - specifically where they overlap with gate lines and data lines and correspond to liquid crystal layer regions. This localized approach improves reliability where needed without adding complexity across the entire display structure.
2Reliability
If the width of the shielding portion is increased to improve electrostatic shielding, then light transmittance decreases
Solution Approach 1:
The shielding function is segmented into multiple narrow electrostatic preventing patterns rather than one wide continuous shield. Each pattern is narrow enough to minimize light blocking, yet collectively they provide comprehensive electrostatic shielding across the display area by being distributed in a matrix arrangement.
Solution Approach 2:
Instead of providing full-width shielding that would guarantee electrostatic protection but block light, the patent uses partial shielding through narrow patterns spaced at specific intervals. This partial action approach provides sufficient electrostatic protection for reliable operation while maintaining acceptable light transmittance for display quality.
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 discharges external electrostatic fields, enhancing light transmittance by up to 5% through increased horizontal electric field intensity, thereby reducing image distortion and improving display performance.
Implementation Method 1
the invention relates to a display apparatus using a horizontal electric field to display images
Implementation Method 2
The liquid crystal display applies an electric field to the liquid crystal layer to rearrange liquid crystal molecules of the liquid crystal layer
Implementation Method 3
applies an electric field to the liquid crystal layer to rearrange liquid crystal molecules
Data Source
AI summary
A display apparatus includes a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate. The first substrate includes a gate line, a data line, a thin film transistor, a pixel electrode and a common electrode. The common electrode includes a shielding portion which overlaps one of the gate line and the data line. The second substrate includes an electrostatic preventing pattern. The electrostatic preventing pattern contacts the liquid crystal layer and overlaps the shielding portion.