Curved Shield Electrode for LCD Light Leakage Prevention
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Solution Overview
Problem
Liquid crystal displays (LCDs) experience light leakage faults between pixels due to electric fields generated by gate signals, which affect image quality and transmittance.
Innovation Solution
The implementation of a shield electrode with a curved portion overlapping the gate line and data line, connected to a reference voltage line, helps to block the electric field and prevent light leakage by shielding the electric field induced by the gate signal, while also reducing the need for light blocking members on the outer side of the pixel electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate-off voltage is applied to the gate line, then the pixel switching is controlled, but charges pile up on the pixel boundary causing light leakage fault
Solution Approach 1:
A shield electrode is introduced as an intermediary component between the gate line and the pixel electrode. This shield electrode is connected to a reference voltage line and positioned to overlap the gate line, effectively mediating the electric field interaction. The shield electrode prevents charge accumulation at the pixel boundary by providing an intermediate potential barrier, thereby eliminating light leakage faults while maintaining proper pixel switching control.
Solution Approach 2:
The patent converts the harmful electric field effect into a beneficial shielding effect. By positioning the shield electrode to overlap the gate line and connecting it to the reference voltage line, the previously harmful electric field that caused charge accumulation is transformed into a controlled shielding mechanism. The shield electrode utilizes the electric field environment to create a protective barrier that prevents light leakage while maintaining display functionality.
2Stability of the object's composition
If minute slits with branch electrodes are defined in the pixel electrode, then liquid crystal alignment is improved, but splay-arrangement of liquid crystal occurs causing light leakage between pixels
Solution Approach 1:
The shield electrode serves as a mediator that prevents the harmful splay-arrangement of liquid crystal molecules. While the minute slits with branch electrodes in the pixel electrode provide necessary liquid crystal alignment control, the shield electrode positioned between the gate line and pixel electrode creates an electric field barrier that prevents excessive splay-arrangement, thereby maintaining proper liquid crystal orientation and preventing light leakage between pixels.
3Object-affected harmful factors
If light blocking members are added to prevent light leakage, then light leakage fault is reduced, but transmittance of the LCD decreases
Solution Approach 1:
The patent replaces the mechanical/optical approach of using light blocking members with an electrical field-based solution. Instead of physically blocking light with opaque materials, the shield electrode uses electric field management to prevent charge accumulation and eliminate the root cause of light leakage. This substitution maintains high transmittance while effectively preventing light leakage faults through electromagnetic field control rather than optical blocking.
4Object-affected harmful factors
If shield electrode is added to block electric field, then light leakage is prevented, but device complexity increases
Solution Approach 1:
The shield electrode is merged with the existing reference voltage line structure. By connecting the shield electrode to the reference voltage line that already exists in the display panel, the patent integrates the shielding function into the existing circuitry rather than adding completely separate components. This merging approach prevents light leakage while minimizing the increase in device complexity by utilizing existing structural elements.
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 effectively prevents light leakage between pixels, enhances transmittance by minimizing the use of light blocking members, and optimizes the outer space of the pixel electrode.
Implementation Method 1
a shield electrode overlapping the gate line and including a curved portion which is disposed on an edge portion of the pixel electrode and overlaps the data line
Data Source
AI summary
A liquid crystal display includes a lower substrate and an upper substrate facing each other, a liquid crystal layer provided between the lower substrate and the upper substrate, a plurality of pixel electrodes provided on the lower substrate, extended in a substantially horizontal direction, and including a thin film transistor forming region and a display area, a reference voltage line extended in a substantially vertical direction along a center of the display area, a gate line provided on the lower substrate and extended in the substantially horizontal direction between neighboring pixel electrodes of the plurality of pixel electrodes, a data line provided on the lower substrate and crossing the gate line, and a shield electrode overlapping the gate line and including a curved portion which is disposed on an edge portion of the pixel electrode and overlaps the data line.