LCD Shield Pattern Reduces Parasitic Capacitance Crosstalk
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Solution Overview
Problem
Liquid crystal display devices face degradation in display quality due to crosstalk caused by parasitic capacitance between electrical elements, leading to unwanted coupling of electric fields and misalignment of liquid crystal molecules.
Innovation Solution
Incorporating a shield pattern on the thin film transistor, made of the same material as the pixel electrode, to reduce parasitic capacitance and block coupling electric fields, thereby improving display quality by suppressing crosstalk and maintaining proper liquid crystal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixel electrodes, common electrode, thin film transistor and other electrical elements are included in the LCD, then the LCD can function as a display device, but crosstalk occurs between electrical elements due to parasitic capacitance, degrading display quality
Solution Approach 1:
A shield pattern is introduced as an intermediary element between electrical components (pixel electrode, common electrode, thin film transistor) to block parasitic capacitance coupling. The shield pattern acts as a mediator that prevents direct electromagnetic interference between adjacent conductive elements, thereby reducing crosstalk while maintaining display functionality.
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and isolated by introducing a separate shield pattern layer. This shield pattern is specifically designed to capture and contain the parasitic electric fields, separating them from the main signal paths and preventing crosstalk between functional elements.
2Object-affected harmful factors
If shield pattern is added to reduce parasitic capacitance, then display quality improves, but device structure becomes more complex
Solution Approach 1:
The shield pattern is merged with existing device layers and manufacturing processes. By integrating the shield pattern into the existing multi-layer structure of the LCD and using materials compatible with existing fabrication processes, the additional complexity is minimized while achieving crosstalk reduction.
Solution Approach 2:
The shield pattern serves multiple functions: it reduces parasitic capacitance, blocks crosstalk, and can be integrated with existing electrode structures. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity.
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 implementation of a shield pattern on the thin film transistor effectively reduces crosstalk, enhancing display quality by minimizing light leakage and increasing the aperture ratio of the liquid crystal display device.
Implementation Method 1
crosstalk between the electrical elements due to parasitic capacitance therebetween
Data Source
AI summary
A liquid display device is provided. The liquid crystal display device includes a first base substrate, a first signal line disposed on the first base substrate and extended in a first direction, a second signal line disposed on the first base substrate, extended in a second direction intersecting the first direction, and insulated from the first signal line, a thin film transistor disposed on the first base substrate and electrically connected to the first signal line and the second signal line, a pixel electrode electrically connected to the thin film transistor, and a shield pattern disposed on a same layer as but spaced apart from the pixel electrode, overlapped with the thin film transistor, and including a material same as a material of the pixel electrode.