Shield Layer Over Gate Line Blocks Stray Electric Fields
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Solution Overview
Problem
Horizontal electric field type liquid crystal displays suffer from light leakage due to stray electric field generation from accumulated electric charges in stray capacitance, which affects the orientation of liquid crystal molecules and decreases contrast.
Innovation Solution
A pixel structure with a shield layer overlapping the gate line is introduced to block stray electric fields, ensuring that the orientation of liquid crystal molecules is not influenced by voltage fluctuations from stray capacitance, thereby preventing light leakage and improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate lines transmit scan signals in horizontal electric field type liquid crystal displays, then the display operation is enabled, but stray electric fields are generated due to accumulated electric charges in stray capacitance, causing light leakage and decreasing contrast
Solution Approach 1:
A shield layer is introduced as an intermediary component between the gate line and the liquid crystal molecules. This shield layer acts as a mediator that blocks the stray electric field generated by the gate line, preventing it from influencing the liquid crystal orientation while allowing the display operation to proceed normally
Solution Approach 2:
The shield layer converts the harmful stray electric field into a beneficial configuration by establishing a controlled electric field environment. The shield layer, being electrically isolated from the electrodes, creates a stable reference potential that prevents voltage fluctuations from affecting the liquid crystal molecules, thereby eliminating light leakage in dark states
2Object-affected harmful factors
If the shield layer is electrically isolated from the electrodes, then stray electric field influence is reduced, but additional structural complexity is introduced
Solution Approach 1:
The shield layer serves multiple functions simultaneously: it blocks stray electric fields, provides a stable reference potential, and prevents voltage fluctuations without requiring complex control circuits. This multi-functionality reduces the need for additional components and simplifies the overall device architecture despite the added shield layer
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 shield layer effectively reduces stray electric field influence, minimizing light leakage and enhancing the contrast of the liquid crystal display by maintaining the desired orientation of liquid crystal molecules.
Implementation Method 1
electric charges can accumulate in the stray capacitance between gate lines and other components of the display with the pixel operation to generate stray electric field which can influence the distribution of the transverse electric field
Implementation Method 2
electric charges can accumulate in the stray capacitance between gate lines and other components of the display
Data Source
AI summary
There is provided a pixel structure of a liquid crystal panel including a transparent substrate, and a gate line, a data line, a switching transistor, a first electrode, a second electrode and a shield layer formed on the transparent substrate. The gate line is substantially perpendicular to the data line. The switching transistor is located adjacent to a crossing point of the gate line and the data line, and is configured to input a display voltage of the data line to the second electrode according to the control of the gate line. The first electrode and the second electrode are arranged in such a way that the display voltage forms a transverse electric field between the first electrode and the second electrode. The shield layer overlaps at least a part of the gate and is electrically isolated from the first electrode and the second electrode.